WO2024056085A1

WO2024056085A1 - Rapid heat treatment production line of strip steel

Info

Publication number: WO2024056085A1
Application number: PCT/CN2023/119209
Authority: WO
Inventors: 张理扬; 李俊; 张利祥; 王健; 刘华飞; 王骏飞; 张宝平; 熊伟; 刘益民; 路凤智; 王甲子; 吴长生; 万照堂; 王超; 王彦辉; 胡广魁; 钱洪卫
Original assignee: 宝山钢铁股份有限公司
Priority date: 2022-09-15
Filing date: 2023-09-15
Publication date: 2024-03-21

Abstract

Provided are a production line for the rapid hot galvanization of a strip steel, a production line for the rapid annealing of a strip steel, an ultra-short-process production line of an ultrahigh-strength strip steel, a flexible production line suitable for various high-strength strip steels and a dual use production line for the continuous annealing or hot galvanization of a high-strength strip steel. An injection straight fire preheating device, an injection radiant tube preheating device and/or a jet radiation composite heating/soaking device of the present invention are used in the production lines, such that rapid heating can be realized.

Description

Rapid heat treatment strip production line

Technical field

The present invention relates to a rapid heat treatment strip production line.

Background technique

In the strip processing line, a common method is to use direct fire heating, and it is preferable to use clean natural gas for direct heating to prevent unclean combustion exhaust gas from contaminating the strip surface, and use direct fire combustion exhaust gas to directly preheat the strip steel. , Another common way is to use radiant tubes for heating, and use radiant tubes to burn exhaust gas to preheat the steel. The prior art has the following shortcomings:

If direct fire heating is used, the exhaust gas emission temperature of direct fire combustion after preheating the steel is still relatively high, usually exceeding 800°C, and sometimes exceeding 850°C. When it exceeds 850°C, cold air is usually required to control the exhaust gas emission temperature at 850°C. ℃ and below can be used for secondary offline use. The higher the exhaust gas temperature, the greater the heat energy loss. It can be seen that with this method, the primary online utilization rate of thermal energy is low, and the steam or hot water generated by the secondary offline utilization often cannot be fully consumed in the unit, so it will bring difficulties in energy balance in the area; due to direct fire combustion The exhaust gas is in direct contact with the strip steel and the contact time is long. In addition, the excess gas in the direct combustion exhaust gas needs to be recombusted in the preheating section. The secondary combustion flame is often an oxidizing flame, which inevitably limits the preheating temperature of the strip steel. Improve, otherwise, it is easy to form an overly thick oxide layer on the surface of the strip steel, especially for high-strength steel and ultra-high-strength steel. Since Si, Mn and other strengthening alloy elements are added to the substrate, the surface of the strip steel is easier to form than ordinary strength products. The enrichment of alloy strengthening elements occurs, causing surface quality problems. Therefore, usually the preheating temperature of strip steel can only be preheated to about 250°C, and the preheating effect is poor. If radiant tube heating is used, the exhaust temperature of the combustion exhaust gas after preheating the steel is still relatively high. When producing high-temperature annealing materials, it usually exceeds 350°C. It is necessary to add a boiler or a superheated water heating device to reuse the waste heat of the combustion exhaust gas, which is economical. The efficiency is significantly reduced, and the equipment occupies a large area. In addition, the proportion of energy directly utilized on the strip is low, that is, a large amount of heat is still taken away by the exhaust gas after preheating the steel (the higher the temperature of the exhaust gas after preheating the steel, the more heat is taken away), and the combustion The heat is not fully transferred to the strip (that is, the primary utilization rate of energy is low). Also, the temperature of the preheated strip is limited, and it is usually difficult for the preheated strip to exceed 250°C.

Contents of the invention

The purpose of the invention is to configure a series of production lines using new direct fire preheating equipment, new radiant tube preheating equipment and/or jet radiation composite heating equipment to achieve rapid heat treatment, etc.

Rapid hot-dip galvanized strip production line

The purpose of the present invention is to provide a rapid hot-dip galvanizing strip production line that can achieve the following objectives: when using direct fire heating, the waste heat of direct fire combustion exhaust gas can be fully utilized, and the strip temperature can be quickly preheated to at least 350°C. Above, and avoid the direct fire combustion exhaust gas from directly contacting the strip steel for a long time in the preheating furnace, thereby avoiding the formation of an excessively thick oxide layer on the surface of the strip steel; when direct fire heating is not used, a new heating technology is used to convert the residual heat of the combustion exhaust gas into It makes full use of and basically transfers the waste heat of the combustion exhaust gas to the strip steel, improving the primary utilization rate of heat energy, so that the combustion exhaust gas can be directly discharged after fully heating the strip steel, without the need to add a boiler or superheated water heating device for secondary use, significantly reducing Investment and reduction of floor space.

In order to achieve the above objects, the technical solution of the present invention is:

A rapid hot-dip galvanizing strip production line, which includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - outlet looper - smoothing - coiling; wherein,

The central continuous post-processing station includes a preheating section, a heating section, a soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced heat preservation section, a secondary reheating section, a furnace nose section, and a zinc pot. section, air knife section, post-plating cooling section and final water cooling section;

The preheating section adopts a jet direct fire preheating device or a jet radiation composite heating device;

The heating section adopts a direct fire heating section and/or a radiant tube heating section;

The soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section;

Both the reheating section and the secondary reheating section use longitudinal magnetic induction heating equipment to rapidly heat the strip.

The injection direct fire preheating device uses the combustion exhaust gas of the direct fire heating section to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange.

In addition to using radiant tubes to radiate and heat the strip, the jet radiation composite heating section and soaking section also use radiant tubes to burn exhaust gas to heat recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced heating. Convective heat transfer.

Preferably, an alloying heating section and an alloying soaking section are provided between the air knife section and the post-plating cooling section; the hot-dip galvanizing is alloyed hot-dip galvanizing.

Preferably, a movable post-plating quick cooling section that can be switched online/offline is provided behind the air knife of the central continuous post-processing station, and the movable post-plating quick cooling section is arranged side by side with the alloying heating section.

Preferably, a cleaning station is provided before the entrance looper station.

Preferably, cleaning stations are provided in front and behind the entrance looper station.

Preferably, a central looper is provided before the leveling station and after the central continuous post-processing station.

Preferably, a finishing station is provided between the coiling station and the outlet looper station, and the strip is coiled after finishing.

Preferably, a tensioning and straightening station is provided between the flattening station and the outlet looper station, and the strip can optionally undergo tensioning and straightening treatment before entering the outlet looper.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is set between the flattening station and the exit looper station. You can choose to carry out surface treatment such as passivation or fingerprint resistance before entering the exit looper.

Preferably, a tension and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are also provided between the flattening station and the exit looper station. The strip steel can be optionally subjected to tension and straightening or/and passivation or fingerprint resistance. Wait for surface treatment before entering the outlet looper.

For the hot-dip pure zinc unit that produces hot-dip pure zinc products, when direct fire heating is used, the rapid hot-dip galvanized strip production line designed by the present invention includes the following stations: uncoiling - welding - entrance looper - cleaning - central continuous post Processing - outlet looper - flattening - coiling; wherein, the central continuous post-processing station includes a jet direct fire preheating section, a direct fire heating section, a radiant tube heating section, a radiant tube soaking section or a jet radiation composite Soaking section, slow cooling section, high hydrogen cooling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

The injection direct fire preheating section uses the direct fire heating section to burn exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange.

When direct fire heating is not used, the rapid hot-dip galvanizing strip production line designed by the present invention includes the following stations: uncoiling - welding - entrance looper - central continuous post-processing - outlet looper - flattening - coiling; wherein, the The central continuous post-processing station consists of a jet radiation composite heating section, a radiant tube heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and two Secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

In the design of the production line of the present invention:

For the alloyed hot-dip galvanizing unit that produces alloyed hot-dip galvanized products, when using direct fire heating, the rapid alloyed hot-dip galvanized strip production line designed by the present invention includes the following stations: Uncoiling-Welding-Inlet Loop-Central Continuous Post-processing-export looper-flattening-coiling; among which,

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, and a balanced insulation section. , secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final water cooling section.

The injection direct fire preheating section uses the direct fire heating section to burn exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

When direct fire heating is not used, the rapid alloying hot-dip galvanized strip production line designed by the present invention includes the following stations: uncoiling - welding - entrance looper - central continuous post-processing - outlet looper - flattening - coiling; wherein,

The central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and a secondary reheating section. , furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final water cooling section.

The jet radiation composite heating section and the soaking section use radiant tubes to radiate the strip steel, and also use the radiant tubes to burn exhaust gas to heat recycled nitrogen and hydrogen protective gases, and then the nitrogen and hydrogen protective gases are sprayed onto the upper and lower surfaces of the strip steel to achieve forced convection. heat exchange;

The soaking section uses jet radiation composite heating equipment to achieve rapid adjustment of the strip soaking temperature when the strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

Preferably, the hot-dip pure zinc station of the central continuous post-processing station in the hot-dip pure zinc strip production line is equipped with an optional movable post-plating quick cooling section after the air knife section and in front of the post-plating cooling section. After hot-dip galvanizing from the zinc pot section and controlling the coating weight through the air knife section equipment, you can choose to use the movable post-plating quick cooling section for post-plating quick cooling, or you can choose not to use the movable post-plating quick cooling section for natural cooling before post-plating. Cooling to achieve continuous production of hot-dip galvanized high-strength strip steel.

In the alloyed hot-dip galvanizing strip production line, after the air knife section of the central continuous post-processing station, an optional mobile post-plating quick cooling section is set up parallel to the alloying heating section. The strip is hot-dip galvanized from the zinc pot section. After the air knife section controls the coating weight, if hot-dip pure zinc products are produced, the mobile post-plating quick cooling section will be switched online and the alloying heating section will be offline; if alloyed hot-dip galvanizing products are produced, the mobile post-plating quick cooling section will be switched online. Offline, switch the alloying heating section equipment to online use.

The differences or innovations between the production line of the present invention and the traditional continuous heat treatment line are:

1. When the present invention uses direct fire heating, a jet direct fire preheating section is used instead of an ordinary preheating section. Its salient features that are different from ordinary preheating sections are:

① Use a heat exchanger in the furnace (the heat exchanger is not arranged outside the furnace) to heat the recycled nitrogen and hydrogen protective gas. The heated nitrogen and hydrogen protective gas is sprayed at high speed onto the upper and lower surfaces of the strip to force convection heat exchange to achieve rapid and efficient preheating of the strip. , compared with the traditional preheating method, this method significantly reduces the heat loss of the furnace shell and protective gas channel, makes full use of the waste heat of the combustion exhaust gas, has higher heating efficiency and faster heating rate;

② In the direct-fire injection preheating section, the combustion exhaust gas from the heating section passes through the heat exchanger chamber of the preheating section. During the passing process, the combustion exhaust gas from the heating section fully exchanges heat with the heat exchanger in the heat exchanger chamber, and the heating Nitrogen and hydrogen protective gas, so the combustion exhaust gas of the heating section in the direct-fire injection preheating section is not always in direct contact with the strip (when the heating section uses direct fire heating, the direct-fire injection preheating section only directly contacts the strip steel for a short period of time in the high-temperature section) Contact and at this time the exhaust gas belongs to a reducing atmosphere or a slightly oxidizing atmosphere), thereby avoiding overoxidation of the strip surface;

③ When the heating section uses direct fire heating, the incompletely burned gas in the direct fire combustion exhaust gas undergoes oxygen-rich secondary combustion in the semi-sealed unit at the top of the jet preheating section, but the burning flame does not contact the strip steel, so it is effective Avoid overoxidation of the strip surface;

④The strip preheating temperature is higher. When the heating section adopts direct fire heating, due to the high heat transfer coefficient of high-temperature nitrogen and hydrogen protective gas injection direct fire injection preheating, the preheated strip temperature can reach at least 350°C and above. The strip temperature is at least 100℃ higher than that of ordinary preheating section;

⑤ When the heating section adopts direct fire heating, the temperature of the direct fire combustion exhaust gas coming out of the preheating section of the injection radiant tube of the present invention is usually much lower than 750°C (if a sufficient number of high-speed injection preheating units are arranged, it can even reach 200°C Directly discharged below), there is no need to mix cold air for secondary use outside the furnace or no need for secondary use at all.

2. When direct fire heating is not used, the jet radiation composite heating section equipment is used to quickly heat the strip. In addition to using the radiant tube to radiate the strip, the heating equipment also uses the radiant tube combustion exhaust gas to heat the recycled nitrogen and hydrogen protective gas. , and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. The heat exchange efficiency is high. The exhaust gas temperature can be directly utilized and then discharged below 250°C. Basically all the combustion heat is transferred to the heating of the strip.

Using direct fire heating equipment, pre-oxidation and reduction treatment can be used on high-strength steel to improve the plateability of high-strength steel;

Through the combined use of direct fire heating equipment or jet radiation composite heating equipment and high hydrogen rapid cooling equipment, rapid heating and rapid cooling annealing of high-strength steel can be achieved, which can improve the strength of high-strength steel;

The invention sets up secondary reheating section equipment to achieve two rises in strip temperature before hot-dip galvanizing, allowing third-generation high-strength steel (QP steel) products to be quickly cooled to a lower temperature and then quickly heated immediately. Carry out long-term carbon redistribution treatment to a higher temperature, and after the treatment is completed, it is quickly reheated to the temperature of the hot-dip galvanizing pot to perform galvanizing treatment;

The alloyed hot-dip galvanizing high-strength steel production line of the present invention can simultaneously produce hot-dip galvanized products with two coating types: hot-dip pure zinc and alloyed hot-dip galvanizing.

The beneficial effects of the present invention are:

1) After preheating, the strip temperature is high and the primary utilization rate of heat energy is high;

2) The plateability of the strip is good when using the direct-fire heating technology solution;

3) Using secondary reheating equipment, the strip temperature can be raised twice before hot-dip galvanizing, which can realize the rapid cooling of third-generation high-strength steel (QP steel) products to a lower temperature, and then quickly heat to a higher temperature. Carry out carbon redistribution treatment at a high temperature for a long time, and after the treatment is completed, it is quickly reheated to the temperature of the hot-dip galvanizing pot for galvanizing;

4) Realize rapid heating and rapid cooling of strip steel, and can produce strip steel products with high strength levels;

5) When using jet radiation composite soaking, the strip soaking temperature can be quickly adjusted when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change, which can reduce quality losses caused by inconsistent strip temperatures.

Rapid hot-dip galvanizing high-strength strip production line

The invention also provides a rapid hot-dip galvanizing high-strength strip steel production line, which can achieve the following purposes: 1) Improve preheating: using new heating technology, the waste heat of the combustion exhaust gas is fully utilized, and basically all the waste heat of the combustion exhaust gas is transmitted to the strip On the steel, the primary utilization rate of heat energy is improved, so that the combustion exhaust gas can be directly discharged after fully heating the strip steel, or make full use of radiation. The waste heat from the tube heating section or the radiant tube soaking section can fully preheat the steel. There is no need to add a boiler or superheated water heating device for secondary use, which significantly reduces investment and floor space. 2) Improve uniform heating to achieve rapid adjustment of the uniform heating temperature of strip steel; 3) Improve ultra-high temperature heating: Use transverse magnetic induction heating technology to further rapidly increase the heating temperature of high-temperature strip steel to achieve ultra-high temperature annealing of high-strength strip steel. and improve energy efficiency.

A rapid hot-dip pure zinc high-strength strip production line, which includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous The post-processing stations include the jet radiation composite heating section, the radiant tube heating section, the transverse magnetic induction heating section, the radiant tube soaking section, the slow cooling section, the high hydrogen cooling section, the reheating section, the balanced insulation section, and the secondary reheating section. , furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section. In addition to using radiant tubes to radiate and heat the strip, the jet radiation composite heating section also uses the radiant tube combustion exhaust gas to heat recycled nitrogen-hydrogen protective gas or full hydrogen gas, and then the nitrogen-hydrogen protective gas or full hydrogen gas is injected into the strip. Forced convection heat transfer is achieved on the upper and lower surfaces. Both the reheating section and the secondary reheating section use longitudinal magnetic induction heating to rapidly heat the strip.

In addition, the rapid hot-dip pure zinc high-strength strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, the The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and two Secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section. The injection radiant tube preheating section uses the radiant tube heating section and the radiant tube soaking section to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. . Both the reheating section and the secondary reheating section use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Furthermore, the rapid hot-dip pure zinc strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, The central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, and a balanced heat preservation section. , secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section; the jet radiation composite heating section not only uses radiant tubes to radiate the strip steel, but also uses radiant tubes to burn The nitrogen and hydrogen protective gas or full hydrogen gas used in the waste gas heating cycle is then sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; both the reheating section and the secondary reheating section adopt vertical Magnetic induction heating equipment rapidly heats the strip.

In addition, the rapid hot-dip pure zinc high-strength strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein , the central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, and a balancing section. Insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section; the injection radiant tube preheating section uses the radiant tube heating section and the radiant tube soaking section to burn the waste gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then Nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; both the reheating section and the secondary reheating section use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Furthermore, an alloying heating section and an alloying soaking section are set between the air knife section and the post-plating cooling section; the hot-dip galvanizing is alloyed hot-dip galvanizing.

Furthermore, an optional movable post-plating quick cooling section is provided after the air knife section and before the post-plating cooling section.

In addition, an optional movable post-plating rapid cooling section is provided behind the air knife section, and the movable post-plating rapid cooling section is arranged side by side with the alloying heating section.

Preferably, a cleaning station is provided before the entrance looper station.

Preferably, cleaning stations are provided before and after the entrance looper station.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is also provided between the flattening station and the outlet looper station. The strip steel can optionally undergo surface treatment such as passivation or fingerprint resistance before entering the outlet looper.

Preferably, a tension and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are set up simultaneously between the flattening station and the exit looper station. The strip steel can be optionally subjected to tension and straightening or/and passivation or fingerprint resistance. Surface treatment then enters the outlet looper.

1) The present invention uses the jet radiation composite heating section equipment to quickly heat the strip. In addition to using the radiant tube to radiate the strip, the heating equipment also uses the radiant tube to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then uses nitrogen and hydrogen to heat the strip. The protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. The heat exchange efficiency is high. The exhaust gas temperature can be directly utilized and then discharged below 250°C. Basically all the combustion heat is transferred to the heated strip.

2) When the present invention uses the radiant tube heating section or the injection radiant tube preheating section equipment that burns exhaust gas in the radiant tube soaking section, the waste heat of the radiant tube heating and soaking can be fully utilized online, and the strip temperature can be preheated to At least above 250℃.

The present invention realizes rapid heating and rapid cooling annealing of high-strength steel through the combined use of a jet radiant tube preheating device or a jet radiation composite heating device + transverse magnetic induction heating equipment and high hydrogen rapid cooling equipment, and can improve the strength of high-strength steel;

3) The present invention uses transverse magnetic induction heating for further rapid improvement of high-temperature strip steel, which can realize ultra-high temperature annealing of high-strength steel;

4) The present invention sets up secondary reheating section equipment to realize two rises in strip temperature before hot-dip galvanizing, which can realize Modern third-generation high-strength steel (QP steel) products are quickly cooled to a lower temperature, and then immediately heated to a higher temperature for a long-term carbon redistribution treatment. After the treatment is completed, they are quickly reheated twice to hot-dip galvanizing. Pot temperature, galvanizing;

5) The hot-dip galvanizing high-strength steel production line of the present invention can simultaneously produce hot-dip galvanized products with two coating types: hot-dip pure zinc and alloyed hot-dip galvanizing.

The beneficial effects of the present invention are:

2) Transverse magnetic induction heating is used for further rapid improvement of high-temperature strip steel, which can realize ultra-high temperature annealing of high-strength steel;

Rapid hot-dip galvanizing ultra-high strength strip production line

The rapid hot-dip galvanizing ultra-high-strength strip production line of the present invention can realize ultra-high-temperature annealing of high-strength strip steel at low cost, and achieves the following purposes: 1) Improved preheating: direct fire heating is used, and the waste heat of direct fire combustion exhaust gas is If fully utilized, the strip temperature can be quickly preheated to at least 350°C, and the direct fire combustion exhaust gas can be prevented from directly contacting the strip for a long time in the preheating furnace, thus avoiding the formation of an excessively thick oxide layer on the surface of the strip. 2) Improve uniform heating to achieve rapid adjustment of the uniform heating temperature of strip steel; 3) Improve ultra-high temperature heating: Use transverse magnetic induction heating technology to further rapidly increase the heating temperature of high-temperature strip steel.

A rapid hot-dip galvanizing ultra-high strength strip production line, which includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, the central continuous The post-processing station includes a spray direct fire preheating section, a direct fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and two Secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the jet direct fire The preheating section uses the direct-fired heating section to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then sprays the nitrogen and hydrogen protective gas onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; both the reheating section and the secondary reheating section adopt Longitudinal magnetic induction heating equipment rapidly heats strip steel.

In addition, the present invention also designs a rapid hot-dip galvanizing ultra-high-strength strip production line, which includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein , the central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, and a uniform heating section. Hot section, slow cooling section, rapid cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section; The soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the rapid cooling section adopts an aerosol cooling section and/or a water quenching cooling section; the jet direct-fire preheating section utilizes a direct-fire heating section. The exhaust gas is burned to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; both the reheating section and the secondary reheating section use longitudinal magnetic induction heating equipment to perform heating on the strip. Heats up quickly.

Furthermore, hot-dip galvanizing adopts alloyed hot-dip galvanizing, that is, an alloying heating section and an alloying soaking section are set between the air knife section and the post-plating cooling section.

Preferably, a flash iron plating or flash nickel plating section is added after the pickling section, and the strip is flash plated before subsequent treatment. Preferably, an optional mobile post-plating rapid cooling section equipment is installed after the air knife section and in front of the post-plating cooling section equipment. After the strip is hot-dip galvanized from the zinc pot section and passes through the air knife section to control the coating weight, you can choose to use the mobile post-plating rapid cooling section equipment. The cold section is used for rapid cooling after plating, or it is not necessary to use the mobile post-plating rapid cooling section for natural cooling and then post-plating cooling to achieve continuous production of hot-dip galvanized strips.

Preferably, after the air knife section, an optional mobile post-plating quick cooling section is set up in parallel with the alloying heating section. After the strip is hot-dip galvanized from the zinc pot section and passed through the air knife section equipment to control the coating weight, if hot-dip pure zinc products are produced , the mobile post-plating quick cooling section is switched to online use, and the alloying heating section equipment is offline; if alloyed hot-dip galvanizing products are produced, the mobile post-plating quick cooling section equipment is switched offline, and the alloying heating section equipment is switched to online use.

Preferably, the radiant tube soaking section is replaced with a jet radiation composite soaking section to achieve rapid adjustment of the strip soaking temperature when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

Preferably, cleaning stations are provided before and after the inlet looper station.

Preferably, a central looper station is set up before the leveling station.

Preferably, a tensioning and straightening station is also provided between the leveling station and the outlet looper station, and the strip can optionally undergo tensioning and straightening treatment before entering the outlet looper.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is set up between the flattening station and the outlet looper station. The strip steel can choose to undergo surface treatment such as passivation or fingerprint resistance before entering the outlet looper.

Preferably, a tension and straightening station equipment and a surface post-treatment station such as passivation or fingerprint resistance are provided between the flattening station and the exit looper station. The strip steel can be optionally subjected to tension and straightening or/and passivation or fingerprint resistance. Surface treatment then enters the outlet looper.

In the rapid hot-dip galvanizing ultra-high-strength steel production line of the present invention, the rapid cooling section adopts a high hydrogen cooling section and a mist cooling section + pickling section in parallel, or a high hydrogen cooling section and a water quenching cooling section + pickling section are connected in parallel, with Steel can choose to use high hydrogen cooling, or use gas mist cooling or water quenching cooling.

In the hot-dip pure zinc and alloyed hot-dip galvanizing ultra-high-strength steel production lines, the rapid cooling section adopts a gas mist cooling section and a water quenching cooling section in series, and a pickling section is set up after the water quenching cooling section. The strip steel can choose to be processed only Aerosol cooling is also an option Only water quenching cooling is performed, or you can choose aerosol cooling first and then water quenching cooling.

In the hot-dip pure zinc or alloyed hot-dip galvanized ultra-high-strength steel production line, the rapid cooling section adopts a high-hydrogen cooling section and a series (aerosol cooling section + water quenching cooling section + pickling section) in parallel, and the strip steel can choose a high-hydrogen cooling section. For hydrogen cooling, you can also choose aerosol cooling, water quenching cooling, or aerosol cooling first and then water quenching cooling.

In the hot-dip pure zinc strip production line, the hot-dip pure zinc station of the central continuous post-processing station is equipped with an optional movable post-plating quick cooling section after the air knife section and in front of the post-plating cooling section. The strip is discharged from the zinc pot. After the hot-dip galvanizing is controlled by the air knife section to control the coating weight, you can choose to use the movable post-plating quick cooling section for post-plating quick cooling, or you can not choose to use the movable post-plating quick cooling section for natural cooling and then post-plating cooling to achieve hot-dip galvanizing. Continuous production of galvanized high-strength steel strip.

In the alloyed hot-dip galvanizing strip production line, after the air knife section equipment of the central continuous post-processing station, an optional mobile post-plating quick cooling section is set up parallel to the alloying heating section. The strip is hot-dip galvanized from the zinc pot section. After the coating weight is controlled by the air knife section, if hot-dip pure zinc products are produced, the mobile post-plating quick cooling section is switched online and the alloying heating section is offline; if alloyed hot-dip galvanizing products are produced, the mobile post-plating quick cooling section is used Switch offline and switch the alloying heating section to online use.

Preferably, an optional cleaning station equipment is provided between the welding station and the entrance looper station. The strip steel can be cleaned through the cleaning station, or the cleaning station can be bypassed; further preferably, at the entrance There are cleaning stations in front and behind the looper station.

The differences or innovations between this invention and the traditional continuous heat treatment line are:

1) When using direct fire heating, use the jet direct fire preheating section instead of the ordinary preheating section. Its significant features that are different from the ordinary preheating section are:

② In the injection direct fire preheating section, the combustion exhaust gas from the heating section passes through the heat exchanger chamber of the preheating section. During the passing process, the combustion exhaust gas from the heating section fully exchanges heat with the heat exchanger in the heat exchanger chamber to heat the nitrogen. Hydrogen protection gas is used, so the combustion exhaust gas of the heating section in the injection direct-fire preheating section is not always in direct contact with the strip (when the heating section is heated by direct fire, the injection direct-fire preheating section is only in direct contact with the high-temperature section for a short time and this When the exhaust gas is a reducing atmosphere or a slightly oxidizing atmosphere), it can avoid peroxidation of the strip surface;

④The preheating temperature of the strip is higher. When the heating section adopts direct fire heating, due to the high heat transfer coefficient of direct fire preheating by high-temperature nitrogen and hydrogen protective gas injection, the preheated strip temperature can reach at least 350°C and above, which is higher than The strip temperature in the ordinary preheating section is at least 100℃ higher;

⑤ When the heating section adopts direct fire heating, the temperature of the direct fire combustion exhaust gas coming out of the injection direct fire preheating section of the present invention is usually much lower than 750°C (if a sufficient number of high-speed injection preheating units are arranged, it can even reach 200°C Directly discharged below), there is no need to mix cold air for secondary use outside the furnace or no need for secondary use at all.

2) The present invention designs a spray direct fire preheating device.

3) Using direct fire heating equipment, pre-oxidation and reduction treatment can be used on high-strength steel to improve the plateability of high-strength steel;

4) Through the combined use of direct fire heating equipment or jet radiation composite heating equipment + transverse magnetic induction heating and high hydrogen rapid cooling equipment, rapid heating and rapid cooling annealing of high-strength steel can be achieved, which can improve the strength of high-strength steel;

5) Transverse magnetic induction heating is used to further rapidly improve high-temperature strip steel and can achieve ultra-high temperature annealing of high-strength steel;

6) The present invention is equipped with secondary reheating section equipment, which realizes two rises in strip temperature before hot-dip galvanizing, and can realize the rapid cooling of third-generation high-strength steel (QP steel) products to a lower temperature, and then immediately Rapidly heat to a higher temperature for long-term carbon redistribution treatment, and after the treatment is completed, quickly reheat to the hot-dip galvanizing pot temperature for a second time to perform galvanizing treatment;

7) The hot-dip galvanizing high-strength steel production line of the present invention can simultaneously produce hot-dip galvanized products with two coating types: hot-dip pure zinc and alloyed hot-dip galvanizing.

The beneficial effects of the present invention are:

1) Realize rapid heating and rapid cooling of strip steel, and can produce strip steel products with high strength levels;

3) When using jet radiation composite soaking, the strip soaking temperature can be quickly adjusted when the strip thickness specification changes, the target temperature changes, the unit speed changes and other working conditions change, which can reduce the quality loss caused by inconsistent strip temperatures;

4) Direct fire heating can be used to apply the pre-oxidation-reduction process, and the ultra-high-strength strip steel has good plating properties;

5) The use of secondary reheating equipment realizes two rises in strip temperature before hot-dip galvanizing, allowing third-generation high-strength steel (QP steel) products to be quickly cooled to a lower temperature and then quickly heated to a higher temperature. Carry out carbon redistribution treatment at a high temperature for a long time, and after the treatment is completed, it is quickly reheated to the temperature of the hot-dip galvanizing pot for galvanizing;

6) After preheating, the strip temperature is high and the primary utilization rate of heat energy is high.

Rapid continuous withdrawal strip production line

The rapid continuous strip steel withdrawal production line of the present invention can achieve the following purposes: when using direct fire heating, the waste heat of direct fire combustion exhaust gas can be fully utilized, the strip steel temperature can be quickly preheated to at least 350°C, and direct fire combustion can be avoided. The exhaust gas directly contacts the strip steel for a long time in the preheating furnace, thereby avoiding the formation of an excessively thick oxide layer on the surface of the strip steel; when direct fire heating is not used, new heating technology is used to fully utilize the waste heat of the combustion exhaust gas and convert the combustion exhaust gas The waste heat is basically transmitted to the strip steel, which improves the primary utilization rate of heat energy, so that the combustion exhaust gas can be directly discharged after fully heating the strip steel. There is no need to add a boiler or superheated water heating device for secondary use, which significantly reduces investment and floor space; In addition, the rapid development of ultra-high-strength steel Rapid heating and rapid cooling shorten the heat treatment cycle time of strip steel; the application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels, which can not only reduce The production cost of high-strength steel can also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving the market competitiveness of high-strength steel products.

A rapid annealing strip steel production line, which includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; the central continuous post-processing station includes pre- Hot section, heating section, soaking section, slow cooling section, rapid cooling section, reheating section, over-aging section, final jet cooling section, final water cooling section; the preheating section adopts a jet direct fire preheating device or jet radiation Composite heating device; the heating section adopts direct fire heating section and/or radiant tube heating section; the soaking section adopts radiant tube soaking or jet radiation composite heating device for soaking; the rapid cooling section adopts high hydrogen cooling, Or aerosol cooling or water quenching cooling.

The present invention also designs a rapid annealing strip steel production line, which includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-exit loop-coiling; the central continuous post-processing station The positions in sequence include preheating section, heating section, radiant tube soaking section, slow cooling section, rapid cooling section, reheating section, over-aging section, final jet cooling section, and final water cooling section; the preheating section adopts jet direct fire Preheating device or jet radiation composite heating device; the heating section adopts a direct fire heating section and/or a radiant tube heating section; the rapid cooling section adopts high hydrogen cooling and aerosol cooling or water quenching cooling arranged in parallel, or gas Mist cooling and water quenching cooling are arranged in parallel and a connecting channel is provided between the mist cooling and water quenching cooling, or high hydrogen cooling, gas mist cooling and water quenching cooling are arranged in parallel and a connecting channel is provided between the mist cooling and water quenching cooling. .

Furthermore, an optional pickling section is set up after the final water cooling section. When the strip passes through the pickling section equipment, it can be used for pickling the strip. When the strip does not need to be pickled, the strip can be bypassed without passing through. Pickling section equipment.

Furthermore, an optional flash plating section is provided after the pickling section. The pickled steel strip can choose to enter the flash plating section to produce flash plating products such as flash nickel plating or flash zinc plating. When the strip does not need to be flash plated, the strip can bypass the flash plating section.

Preferably, a cleaning station is set up between the welding station and the entrance looper station. The strip can be cleaned through the cleaning station equipment, or the cleaning station can be bypassed; preferably, the strip is cleaned at the entrance looper station. Cleaning stations are set up at the front and back of the station. The strip is cleaned for the first time, enters the looper, then cleaned for the second time, and then enters the central continuous post-processing station.

Preferably, a finishing station is set up before the coiling station, and the strip is finished and then coiled.

Preferably, an intermediate looper station is provided before the leveling station.

Preferably, a tensioning and straightening station is provided between the leveling station and the outlet looper station.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is set up between the flattening station and the outlet looper station. The strip steel can choose to undergo surface treatment such as passivation or fingerprint resistance before entering the outlet looper; or, in Between the flattening station and the exit looper station, a tension and straightening station equipment and a surface post-treatment station such as passivation or fingerprint resistance are set up at the same time. The strip can be selected for tension and straightening or/ and surface treatments such as passivation or fingerprint resistance before entering the exit looper.

The invention can change the radiant tube soaking section to a jet radiation composite heating device for soaking, thereby realizing rapid adjustment of the strip soaking temperature when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

When direct-fire heating is used, the injection direct-fire preheating section is used instead of the ordinary preheating section. Its significant features that are different from the ordinary preheating section are:

④The preheating temperature of the strip is higher. When the heating section adopts direct fire heating, due to the high heat transfer coefficient of direct fire preheating by high-temperature nitrogen and hydrogen protective gas injection, the preheated strip temperature can reach at least 350°C and above, which is higher than The strip temperature in the ordinary preheating section is at least 100°C higher;

When direct fire heating is not used, the jet radiation composite heating section equipment is used to quickly heat the strip. In addition to using the radiant tube to radiate the strip, the heating equipment also uses the radiant tube combustion exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then The nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. The heat exchange efficiency is high. The exhaust gas temperature can be directly utilized and then discharged below 250°C. Basically all the combustion heat is transferred to the heating of the strip.

The technical solution of the present invention can realize the continuous production of ultra-high-strength steel with three different surface states: cold rolling annealing, pickling and flash plating.

The beneficial effects of the present invention are:

1) After preheating, the temperature of the strip is high and the thermal energy utilization rate is high;

2) Realize rapid heating and rapid cooling of strip steel, and can produce strip steel products with high strength levels;

3) When the jet radiation composite heating device is used for soaking, the strip soaking temperature can be quickly adjusted when the strip thickness specification changes, the target temperature changes, the unit speed changes and other working conditions change, which can reduce the quality caused by inconsistent strip temperatures. loss;

4) The application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. The composition of 450MPa grade products can reach the strength of 590MPa grade products, corresponding to 780MPa grade The composition of the product can reach the performance of 980MPa grade products, which can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving high-strength steel products. market competitiveness;

5) Realize rapid heating and rapid cooling of ultra-high-strength steel and shorten the heat treatment cycle time of strip steel.

Rapid continuous withdrawal of high-strength strip steel production line

The rapid continuous withdrawal of high-strength steel strip production line of the present invention uses jet radiation composite heating and transverse magnetic induction heating to achieve rapid heating of the strip, and uses a high hydrogen cooling section or a mist cooling section or a water quenching cooling section to achieve rapid cooling of the strip and shorten the strip. The heat treatment cycle time of steel; the application of this rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels, which can not only reduce the production cost of high-strength steel, but also improve the performance of various ultra-high-strength steels. The mechanical properties and subsequent processing properties of the product (such as welding performance, coating performance); at the same time, the strip temperature is quickly heated to above 900°C to achieve ultra-high temperature annealing treatment of high-strength steel.

To achieve the above object, the technical solution of the present invention is:

A rapid annealing high-strength strip steel production line, which includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-exit loop-coiling; wherein, the central continuous post-processing station It sequentially includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a soaking section, a slow cooling section, a rapid cooling section, a reheating section, an over-aging section, a final jet cooling section, and a final water cooling section; the jet The radiation composite heating section installs the radiant tube inside the high-speed jet air box and quickly transfers the heat generated by the combustion gas of the radiant tube to the strip through two methods: high-speed and high-temperature jet and radiation to achieve rapid heating of the strip; the rapid cooling section It includes a high hydrogen cooling section, a mist cooling section or a water quenching cooling section; the soaking section adopts a radiant tube heating device or a jet radiation composite heating device.

Furthermore, the present invention also provides a rapid annealing high-strength steel strip production line, which includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, the The central continuous post-processing station includes the jet radiation composite heating section, the radiant tube heating section, the transverse magnetic induction heating section, the soaking section, the slow cooling section, the rapid cooling section, the reheating section, the over-aging section, the final jet cooling section, and the final Water cooling section; the jet radiation composite plus In the hot section, the radiant tube is installed inside the high-speed jet air box, and the heat generated by the combustion gas of the radiant tube is quickly transferred to the strip through two methods: high-speed and high-temperature jet and radiation, so as to achieve rapid heating of the strip; the rapid cooling section includes high Hydrogen cooling section, mist cooling section or water quenching cooling section; the high hydrogen cooling section and the mist cooling section are arranged in parallel, or the high hydrogen cooling section and the water quenching cooling section are arranged in parallel; the soaking section adopts radiation Tube heating device or jet radiant composite heating device.

This production line simultaneously uses a jet radiation composite heating device + transverse magnetic induction heating section and a rapid cooling method of high hydrogen cooling section or mist cooling section or water quenching cooling section to perform rapid heating and rapid cooling to achieve ultra-high strength strip steel of continuous production.

Furthermore, the rapid annealing high-strength steel strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, the The central continuous post-processing station includes the jet radiation composite heating section, the radiant tube heating section, the transverse magnetic induction heating section, the radiant tube soaking section, the slow cooling section, the rapid cooling section, the reheating section, the over-aging section, and the final jet cooling section. , the final water-cooling section; the jet radiation composite heating section installs the radiant tube inside the high-speed jet air box, and quickly transfers the heat generated by the combustion gas of the radiant tube to the strip through two methods of high-speed and high-temperature jet and radiation, realizing the strip steel Rapid heating; the rapid cooling section includes an aerosol cooling section and a water quenching cooling section, the aerosol cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section; forming The strip steel can be cooled by aerosol cooling first and then water quenching, or by three cooling modes: aerosol cooling only, or water quenching cooling only; the soaking section adopts a radiant tube heating device or a jet radiation composite heating device; the transverse magnetic induction The heating section is used to further rapidly increase the temperature of high-temperature strip steel.

Furthermore, the rapid cooling section also includes a high hydrogen cooling section, which is arranged in parallel with the aerosol cooling section; the high hydrogen cooling section is arranged in parallel with the aerosol cooling section + water quenching cooling section arranged in series, forming a Strip steel or select the fourth cooling mode for the high hydrogen cooling section only.

Preferably, an optional pickling section is provided after the final water cooling section.

Preferably, an optional flash plating section is provided after the pickling section.

Preferably, a cleaning station is provided between the welding station and the entrance looper station. Preferably, a cleaning station is provided before and after the entrance looper station.

Preferably, a finishing station is provided before the coiling station.

Preferably, a surface post-treatment station such as passivation or fingerprint resistance is provided between the flattening station and the outlet looper station.

Preferably, a tensioning and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are simultaneously provided between the flattening station and the exit looper station.

This production line simultaneously uses a jet radiation composite heating device, a transverse magnetic induction heating section and a rapid cooling equipment such as a high hydrogen cooling section or a mist cooling section equipment or a water quenching cooling section equipment to perform rapid heating and rapid cooling processing to achieve ultra-high speed cooling. Continuous production of high-strength steel strips.

The present invention uses a jet radiation composite heating device to quickly heat the strip. In addition to using radiant tubes to radiate and heat the strip, the heating equipment also uses the radiant tube combustion exhaust gas to heat recycled nitrogen and hydrogen protective gas or full hydrogen gas (hydrogen concentration 100 %), and then the nitrogen-hydrogen protective gas or full hydrogen gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. The heat exchange efficiency is high. The exhaust gas temperature can be directly utilized and then discharged below 250°C, basically transmitting and utilizing all the combustion heat. Heating of strip steel.

By arranging the transverse magnetic induction heating equipment after the radiant tube heating section, the temperature of the high-temperature strip can be further rapidly increased, and the strip can be heated to above 900°C for annealing treatment.

The present invention realizes rapid heating and rapid cooling annealing of high-strength steel through the combined use of jet radiation composite heating equipment + transverse magnetic induction heating equipment and high-hydrogen rapid cooling equipment, and can improve the strength of high-strength steel.

The invention can realize the continuous production of ultra-high-strength steel with three different surface states: cold rolling annealing, pickling and flash plating.

The beneficial effects of the present invention are:

1) The present invention realizes rapid heating and rapid cooling of strip steel, and can produce high-strength strip steel products with high strength levels;

2) The present invention can achieve ultra-high temperature annealing above 900°C;

3) When the present invention adopts jet radiation composite soaking, the strip soaking temperature can be quickly adjusted when the strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change, which can reduce quality problems caused by inconsistent strip temperatures. loss;

5) The present invention realizes rapid heating and rapid cooling of ultra-high-strength steel and shortens the heat treatment cycle time of strip steel.

Rapid annealing ultra-high strength strip production line

The rapid annealing ultra-high strength strip production line of the present invention can achieve the following purposes: when using direct fire heating, the waste heat of direct fire combustion exhaust gas can be fully utilized, the strip temperature can be quickly preheated to at least 350°C, and direct fire can be avoided The combustion exhaust gas directly contacts the strip steel for a long time in the preheating furnace, thereby avoiding the formation of an excessively thick oxide layer on the surface of the strip steel; basically all the waste heat of the combustion exhaust gas is transferred to the strip steel, improving the primary utilization rate of heat energy, so that the combustion exhaust gas can fully heat the strip The steel can be discharged directly without adding a boiler or superheated water heating device for secondary use, which significantly reduces investment and floor space. Improve the uniform heating and realize the rapid adjustment of the uniform heating temperature of the strip. Improve ultra-high temperature heating: Use transverse magnetic induction heating technology for high-temperature heating The heating temperature of temperate strip steel is further rapidly increased to achieve ultra-high temperature annealing of high-strength strip steel and improve energy utilization. In addition, rapid heating and rapid cooling of ultra-high-strength steel can be achieved to shorten the heat treatment cycle time of strip steel; the application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced products with higher strength levels. High-strength steel products can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving the market competitiveness of high-strength steel products.

A rapid annealing ultra-high strength strip production line, which includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-exit loop-coiling; wherein, the central continuous post-processing station The positions include the jet direct fire preheating section, the direct fire heating section, the radiant tube heating section, the transverse magnetic induction heating section, the soaking section, the slow cooling section, the rapid cooling section, the reheating section, the over-aging section, and the final jet cooling section. The final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the rapid cooling section adopts a high hydrogen cooling section, aerosol cooling section or water quenching cooling section; or, a high hydrogen cooling section Arranged in parallel with the aerosol cooling section or water quenching cooling section; or, the aerosol cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section; or, the high hydrogen cooling section , the aerosol cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section, and the high hydrogen cooling section is connected to the reheating section.

Preferably, an optional pickling section is provided after the final water cooling section, and the strip can choose to pass through the pickling section or bypass the pickling section.

Preferably, an optional flash plating section is also provided after the pickling section. After pickling the steel strip, you can choose to perform flash nickel plating or flash zinc plating, or you can skip the flash plating section and directly produce pickled surface products.

Preferably, a cleaning station is set up between the welding station and the entrance looper station. Preferably, a cleaning station is set up before and after the entrance looper station; the strip is cleaned for the first time, enters the looper, and then Clean for the second time and then enter the central continuous post-processing station.

Preferably, a finishing station is set up before the coiling station to finish the strip before coiling it.

Preferably, an intermediate looper station is set up before the leveling station. After central continuous post-processing of the strip, it enters the central looper and then enters leveling. This can achieve central continuous post-processing without slowing down and replace the work roll of the leveling machine.

Preferably, a tension and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are provided between the flattening station and the exit looper station. The strip steel can be optionally subjected to tension and straightening or/and passivation or fingerprint resistance. Post-processing then enters the outlet looper.

2) Through the combined use of direct fire heating equipment, transverse magnetic induction heating equipment and high hydrogen rapid cooling equipment, rapid heating and rapid cooling annealing of high-strength steel can be achieved, which can improve the strength of high-strength steel;

3) Transverse magnetic induction heating is used to further rapidly improve high-temperature strip steel and can achieve ultra-high temperature annealing of high-strength steel;

4) The soaking section of the present invention adopts a jet radiation composite soaking section to realize rapid adjustment of the strip soaking temperature when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

5) The technical solution of the present invention can also realize the continuous production of ultra-high-strength steel with three different surface states: cold rolling annealing, pickling and flash plating.

The beneficial effects of the present invention are:

1) In the present invention, the strip temperature is high after preheating, and the primary utilization rate of heat energy is high;

2) The present invention realizes rapid heating and rapid cooling of strip steel, and can produce strip steel products with high strength levels;

3) When the present invention adopts jet radiation composite soaking, the strip soaking temperature can be quickly adjusted when the strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change, which can reduce quality problems caused by inconsistent strip temperatures. damage lose;

4) The application of the rapid heating, rapid cooling and rapid heat treatment process technology of the present invention can use lower alloy compositions to produce various advanced high-strength steel products with higher strength levels. The composition of 450MPa grade products can reach the strength of 590MPa grade products. Correspondingly The composition of 780MPa grade products can reach the performance of 980MPa grade products, which can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving high-strength steel products. Market competitiveness of steel products;

5) The present invention realizes rapid heating and rapid cooling of ultra-high-strength steel and shortens the heat treatment cycle time of strip steel;

6) The technical solution of the present invention can realize the continuous production of ultra-high-strength steel with three different surface states: cold rolling annealing, pickling and flash plating.

Ultra-short process dual-purpose strip production line

The ultra-short flow dual-purpose strip production line of the present invention can flexibly select the production of continuous withdrawal products or hot-dip galvanized products according to market demand; the unit occupies a small area; the number of crew members is small; the gas consumption is small; and the overall operation of the unit is reduced Cost; through the use of rapid heating technology, fine-grained austenite can be generated during the heating process of high-strength steel, thereby further improving the strength of high-strength steel; rapid heating and rapid cooling of high-strength steel can be achieved, and the strip life can be shortened. Heat treatment cycle time; the application of rapid heating, rapid cooling and rapid heat treatment process technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels, which can not only reduce the production cost of high-strength steel, but also improve various high-strength steel products. The mechanical properties and subsequent processing properties (such as welding performance and coating performance) of steel products can significantly improve the market competitiveness of high-strength steel products.

An ultra-short process dual-purpose strip production line, which includes the following stations in sequence: uncoiling-welding-entry looper-central continuous post-processing-flattening-exit loop-coiling; wherein, the central continuous post-processing station It includes in turn the transverse magnetic induction heating section, the radiant tube soaking section, the gas mist cooling section or/and the water quenching cooling section, the pickling section, the reheating section, and the parallel arrangement (furnace nose section + zinc pot section + air knife section + plating Post-cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water-cooling section.

The strip adopts transverse magnetic induction heating for rapid heating, and gas mist cooling or/and water quenching cooling is selected for rapid cooling, realizing the rapid heat treatment process of rapid heating and rapid cooling of the strip.

In the aerosol cooling section or/and water quenching cooling section, the strip can be cooled by aerosol cooling or water quenching, or the strip can be cooled by aerosol cooling first and then by water quenching.

(furnace nose section + zinc pot section + air knife section + post-plating cooling section) is arranged in parallel with (moving channel section + overaging section + final jet cooling section). The strip steel can choose to go through the furnace nose section + zinc pot section + gas Tool section + post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products. You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, the continuous retreat process path to produce continuous annealed products; the moving channel section is connected in parallel with the furnace nose section, and the moving channel section can be moved to an online position or to an offline position, and the continuous retreat process path and hot plating can be achieved by cutting the strip and re-threading it. Switching of pure zinc process path.

An ultra-short process dual-purpose strip production line, which includes the following stations in sequence: uncoiling-welding-entry looper-central continuous post-processing-flattening-exit loop-coiling; wherein, the central continuous post-processing station It includes in turn the transverse magnetic induction heating section, the radiant tube soaking section, the gas mist cooling section or/and the water quenching cooling section, the pickling section, the reheating section, and the parallel arrangement (furnace nose section + zinc pot section + air knife section + alloy Heating section + alloying soaking section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

The invention designs a parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), The strip steel can choose to go through the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, the alloyed hot-dip galvanizing process path is used to produce alloyed hot-dip products. When the alloying heating section + alloying soaking section are not started and put into operation, the strip steel passes through these process sections to produce hot-dip pure zinc products. You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, the continuous annealing process path is used to produce continuous annealed products.

The mobile channel section and the furnace nose section are designed in parallel. The mobile channel section can be moved to the online position or to the offline position. By cutting the strip steel and re-threading the strip, the continuous withdrawal process path and the hot-dip galvanizing process path can be switched. .

An ultra-short process dual-purpose strip production line, which includes the following stations in sequence: uncoiling-welding-entry looper-central continuous post-processing-flattening-exit loop-coiling; wherein, the central continuous post-processing station It includes in turn the transverse magnetic induction heating section, the radiant tube soaking section, the gas mist cooling section or/and the water quenching cooling section, the pickling section, the reheating section, the balanced insulation section, the secondary reheating section, and the parallel arrangement (furnace nose section) + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

The design of the invention adopts a balanced insulation section + a secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel.

The invention designs a parallel arrangement (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + outdated Effective section + final jet cooling section), the strip steel can choose to go through the furnace nose section + zinc pot section + air knife section + post-plating cooling section, that is, use the hot-dip galvanizing process path to produce hot-dip pure zinc products, or you can choose to go through the hot-dip galvanizing process path. Moving channel section + over-aging section + final jet cooling section, that is, the continuous annealing process path is used to produce continuously annealed products.

The mobile channel section and the furnace nose section are designed in parallel. The mobile channel section can be moved to the online position or to the offline position. By cutting the strip and rethreading the strip, the continuous withdrawal process path and the hot-dip pure zinc process path can be realized. switch.

An ultra-short process dual-purpose strip production line, which includes the following stations in sequence: uncoiling-welding-entry looper-central continuous post-processing-flattening-exit loop-coiling; wherein, the central continuous post-processing station It includes in turn the transverse magnetic induction heating section, the radiant tube soaking section, the gas mist cooling section or/and the water quenching cooling section, the pickling section, the reheating section, the balanced insulation section, the secondary reheating section, and the parallel arrangement (furnace nose section) + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final air jet cooling section), and final water cooling section.

The design of the present invention adopts a balanced insulation section + a secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel; it is also characterized by the gas mist cooling section or/and water quenching cooling section, and the strip steel can You can choose aerosol cooling, water quenching cooling, or aerosol cooling first and then water quenching cooling.

The invention designs a parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), The strip steel can choose to go through the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, the alloyed hot-dip galvanizing process path is used to produce alloyed hot-dip galvanized products. , and when the alloying heating section + alloying soaking section are not started and put into operation, the strip steel passes through these process sections to produce hot-dip pure zinc products, or you can choose to use the moving channel section + over-aging section + final jet The cooling section uses the continuous annealing process path to produce continuously annealed products.

Preferably, a movable post-plating quick cooling section is arranged after the air knife section. The movable post-plating quick cooling section is configured for online and offline switching, and is arranged in parallel with the alloying heating section (designed to be movable). When producing hot-dip pure zinc products, the movable post-plating quick cooling section is online to quickly cool the plated strip. At this time, the alloying heating section is offline; when producing alloyed hot-dip galvanized products, the movable post-plating quick cooling section is offline. At this time, the alloying heating section is online and the strip steel is alloyed and heated.

Preferably, an optional cleaning station is provided between the welding station and the entrance looper station. The strip steel can be cleaned through the cleaning station or bypassed and skipped.

Preferably, the cleaning station is set after the entrance looper station, and the strip steel can choose to be cleaned through the cleaning station, or it can bypass the cleaning station.

Preferably, cleaning stations are set up before and after the entrance looper station to perform secondary cleaning of the strip to further improve the surface quality of the strip.

Preferably, a longitudinal magnetic induction heating section is arranged before the transverse magnetic induction heating section. The strip passes through the longitudinal magnetic induction heating section first. You can choose longitudinal magnetic induction heating, or you can pass through the longitudinal magnetic induction heating section and directly enter the transverse magnetic induction heating section for heating.

Preferably, a flash iron or nickel plating station is provided after the pickling section, and the strip after pickling can be flash plated with iron or nickel to improve the plateability of the strip.

Preferably, an intermediate looper station is set up before the smoothing station so that the smoothing machine can replace the work rolls online without losing the quality of the strip.

Preferably, a tensioning and straightening station is provided between the flattening station and the outlet looper station, and the strip can be stretched and straightened before entering the outlet looper.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is set up between the flattening station and the outlet looper station. The strip steel can undergo surface post-processing such as passivation or fingerprint resistance before entering the outlet looper.

Preferably, a tensioning and straightening station and a corresponding surface post-treatment station such as passivation or fingerprint resistance are simultaneously provided between the flattening station and the exit looper station. The strip steel can be subjected to surface post-treatment such as passivation or fingerprint resistance. , and then enter the exit looper.

1) You can flexibly choose the production of continuous withdrawal products or the production of hot-dip galvanized products;

2) The equipment configuration is relatively simple and occupies a small area;

3) The production line requires few personnel;

4) The production line consumes less gas;

5) The comprehensive operating cost of the production line is low;

6) The production line has low CO2 and NOx emissions and is suitable for construction in urban steel plants;

7) Through the combined use of transverse magnetic induction heating equipment and a variety of rapid cooling equipment, rapid heating, rapid cooling and annealing can be achieved, and rapid heat treatment of high-strength strip steel can be continuously produced;

8) It can realize the continuous production of strip steel products with three different surface conditions: cold rolling, hot-dip pure zinc and alloyed hot-dip galvanizing.

The beneficial effects of the present invention are:

2) The equipment configuration is relatively simple and occupies a small area;

3) The production line requires relatively few personnel;

4) The production line consumes less gas;

5) The comprehensive operating cost of the production line is low;

7) The application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. The composition of 450MPa grade products can reach the strength of 590MPa grade products; 780MPa grade products The composition can reach the performance of 980MPa grade products, which can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products;

8) Realize rapid heating and rapid cooling of ultra-high-strength steel and shorten the heat treatment cycle time of strip steel.

Ultra-short process hot-dip pure zinc high-strength strip production line

The ultra-short process hot-dip pure zinc high-strength strip production line of the present invention can achieve the following purposes: 1) reduce the floor space of the unit; 2) reduce the number of crew members; 3) reduce the overall operating cost of the unit; 4) use rapid heating technology Using it, fine-grained austenite can be generated during the heating process of high-strength steel, which can further improve the strength of high-strength steel; 5) realize rapid heating and ultra-fast cooling of high-strength steel, shorten the heat treatment cycle time of strip steel, and can Produce ultra-high-strength steel products with high martensite content; 6) The application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels, which can not only reduce the Steel production costs can also be improved, and the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various high-strength steel products can be improved, significantly improving the market competitiveness of high-strength steel products; 7) Realizing ultra-high temperature heating of high-strength steel, with The heating temperature of steel can be heated to 900°C or even above, thereby achieving ultra-high temperature heating annealing treatment of hot-dip galvanized high-strength steel.

An ultra-short process hot-dip pure zinc high-strength strip steel production line, which includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - outlet looper - flattening - coiling; wherein, the central continuous post The processing stations include a rapid heating station, a soaking station, a rapid cooling station, a surface modification station and a hot-dip pure zinc station; the rapid heating station adopts direct fire heating equipment; the soaking station The station adopts radiant tube heat soaking equipment or jet radiation composite heat soaking equipment; the rapid cooling station adopts aerosol cooling equipment or water quenching cooling equipment; the surface modification station adopts pickling equipment; the hot-dip pure zinc The workstations are successively set up with a reheating section, a furnace nose section, a zinc pot section, an air knife section, a post-plating cooling section and a final water cooling section; at this point, direct fire heating equipment and aerosol cooling equipment are used on the same production line for rapid heating, Rapid cooling treatment, and use of pickling equipment for surface modification, improves the plateability of ultra-high-strength steel, and enables continuous production of hot-dip galvanized ultra-high-strength strip steel.

Preferably, the rapid heating station is equipped with direct fire heating equipment and transverse magnetic induction heating equipment in sequence.

Preferably, in the surface modification station, optional flash iron plating or flash nickel plating equipment is provided after the pickling section, followed by the subsequent hot-dip pure zinc station.

Preferably, in the hot-dip pure zinc station, a moving post-plating cooling section can be optionally provided between the air knife section and the post-plating cooling section. Quick cooling equipment.

Preferably, the hot-dip pure galvanizing station is replaced with an alloyed hot-dip galvanizing station, that is, an alloying heating section and an alloying soaking section are provided between the air knife section and the post-plating cooling section, so that production can be achieved. Hot-dip pure zinc products can also be used to produce alloyed hot-dip galvanized products.

Preferably, the hot-dip galvanizing station is equipped with optional mobile post-plating quick cooling section equipment in parallel with the alloying heating section after the air knife section.

Preferably, a cleaning station is provided between the welding station and the inlet looper station.

Preferably, a cleaning station is provided after the inlet looper station.

Preferably, a central looper device is installed in front of the leveling station.

Preferably, a finishing station equipment is installed between the coiling station and the outlet looper station, and the strip is coiled after finishing.

Preferably, surface post-processing equipment such as passivation or fingerprint resistance is provided between the flattening station and the outlet looper station.

Preferably, the soaking station uses electric radiation tube soaking equipment, resistance wire soaking equipment or resistance belt soaking equipment instead of the radiation tube soaking equipment or the jet radiation composite soaking equipment.

1) The technical solution of the present invention has simple equipment configuration and small floor space.

2) The hot-dip pure zinc and alloyed hot-dip galvanizing ultra-high-strength steel production lines of the technical solution of the present invention require fewer personnel.

3) The ultra-high-strength steel production line of the technical solution of the present invention has low comprehensive operating costs.

4) Through the use of direct fire heating equipment, pre-oxidation and reduction treatment can be used on ultra-high-strength steel to improve the plateability of high-strength steel.

5) Through the combined use of direct fire heating equipment + transverse magnetic induction heating equipment and aerosol cooling or water quenching cooling or aerosol + water quenching cooling equipment, rapid heating and ultra-rapid cooling annealing of high-strength steel are achieved, reducing the annealing process The enrichment of strengthening elements such as Si and Mn in the medium substrate on the surface of the substrate further improves the platingability of high-strength steel and can produce ultra-high-strength steel with high martensite content.

6) The technical solution of the present invention can quickly heat strip steel to 900°C or even above by using transverse magnetic induction heating equipment and direct fire heating equipment in series.

7) The alloyed hot-dip galvanizing high-strength steel production line in the technical solution of the present invention can simultaneously produce hot-dip galvanized products with two coating types: hot-dip pure zinc and alloyed hot-dip galvanizing.

The beneficial effects of the present invention are reflected in:

1) The unit is short in length and occupies a small area.

2) The crew configuration is small, and a crew of 4 people can operate it.

3) The overall operating cost of the unit is low.

4) The application of rapid heating, ultra-rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. The composition of 450MPa grade products can reach the strength of 590MPa grade products, corresponding to 780MPa The composition of grade products can reach the performance of 980MPa grade products, which can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving high-strength steel Product market competitiveness.

5) Realized the production of martensitic steel hot-dip galvanizing and alloyed hot-dip galvanizing products.

6) Realize rapid heating and rapid cooling of high-strength steel and shorten the heat treatment cycle time of strip steel.

7) Realize ultra-high temperature heating of high-strength steel. The heating temperature of strip steel can be heated to 900°C or even above, thereby realizing ultra-high temperature heating annealing treatment of high-strength steel.

Ultra-short process and ultra-high strength strip production line

The ultra-short-process ultra-high-strength strip steel production line of the present invention can achieve the following purposes: 1) reduce the floor space of the unit; 2) reduce the number of crew members; 3) reduce the overall operating cost of the unit; 4) through the use of rapid heating technology, During the heating process of ultra-high-strength steel, fine-grained austenite is generated, which can further improve the strength of ultra-high-strength steel; 5) Realize rapid heating and rapid cooling of ultra-high-strength steel, and shorten the heat treatment cycle time of strip steel; 6) The application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. It can not only reduce the production cost of high-strength steel, but also improve the quality of various ultra-high-strength steel products. Mechanical properties and subsequent processing properties (such as welding performance, coating performance); 7) Realize ultra-high-temperature heating of ultra-high-strength steel. The heating temperature of strip steel can be heated to 900°C or even above, thereby achieving ultra-high-temperature heating annealing of ultra-high-strength steel. deal with.

An ultra-short flow ultra-high-strength strip steel production line, which includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - outlet looper - coiling; wherein, the central continuous post-processing station includes in sequence Rapid heating station, soaking station and rapid cooling station; the rapid heating station adopts jet radiation composite heating device; the soaking station adopts radiant tube heating equipment, jet radiation composite heating equipment, electric radiation Pipe heating equipment, resistance wire heating equipment or resistance band heating equipment; the rapid cooling station adopts high hydrogen cooling equipment, aerosol cooling equipment or water quenching cooling equipment.

Furthermore, the rapid heating station adopts a jet radiation composite heating device and a transverse magnetic induction heating device arranged in series, and the rapid cooling station adopts aerosol cooling equipment and water quenching cooling equipment arranged in series or parallel, or is high hydrogen cooling. The equipment is arranged in parallel with the water quenching cooling equipment, or the high hydrogen cooling equipment and the aerosol cooling equipment are arranged in parallel, or the high hydrogen cooling equipment, the aerosol cooling equipment and the water quenching cooling equipment are arranged in parallel.

Preferably, an optional cleaning station is provided between the welding station and the inlet looper station.

Furthermore, the rapid heating station uses optional direct fire heating equipment set in parallel and air jet radiation composite heating device + transverse magnetic induction heating equipment set in series. The strip can choose to go through the direct fire heating equipment first and then the air jet set in series. Radiation composite heating device + transverse magnetic induction heating equipment for heating, or you can bypass the direct fire heating equipment and directly enter the series-connected jet radiation composite heating device + transverse magnetic induction heating equipment for heating.

In addition, the rapid heating station adopts optional longitudinal magnetic induction heating equipment and a jet radiation composite heating device + transverse magnetic induction heating equipment arranged in parallel or in series. The strip can be heated by the longitudinal magnetic induction heating equipment first, or it can be heated by the side. By skipping the longitudinal magnetic induction heating equipment and directly entering the jet radiation composite heating device + transverse magnetic induction heating arranged in series for heating.

Preferably, optional pickling section equipment is installed in front of the coiling station and behind the central continuous post-processing station. When the strip passes through the pickling section, it can be used for pickling the strip. When the strip does not need to be pickled, At this time, the strip can be bypassed without passing through the pickling section.

Preferably, an optional flash plating section is provided after the pickling section and before the coiling station. The pickled strip steel can optionally enter the flash plating section to produce flash plating products such as nickel or zinc. When When flash plating is not required for the strip, the strip can bypass the flash plating section.

Preferably, a leveling station is set up before the coiling station to level the strip before coiling it.

Preferably, a finishing station is provided between the coiling station and the smoothing station. After the strip is flattened, it is finished and then coiled.

Preferably, electric radiant tube heating equipment, resistance wire heating equipment, or resistance band heating equipment are used instead of radiant tube heating equipment or jet radiation composite heating equipment to build the production line of the present invention to produce ultra-high-strength products in places where gas is not available. Strip steel.

Preferably, an optional cleaning station is provided between the welding station and the entrance looper station. The strip steel can be cleaned through the cleaning station or bypassed and skipped. It is further preferred to set the optional cleaning station immediately after the entrance looper station, so that when the strip enters the cleaning station equipment for cleaning, constant speed cleaning can be achieved and stable strip surface cleaning quality can be maintained.

1) The equipment of the present invention is configured simply and occupies a small area;

2) The ultra-high-strength steel production line of the present invention requires fewer personnel;

3) The ultra-high-strength steel production line of the present invention has low comprehensive operating costs;

4) The ultra-high-strength steel production line of the present invention itself achieves small or even zero emissions of CO2 and NOx, and is very suitable for construction in urban steel plants;

5) Through the combined use of the jet radiation composite heating device and a variety of rapid cooling equipment, rapid heating and rapid cooling annealing of ultra-high-strength steel can be achieved, and rapid heat-treated ultra-high-strength strip steel can be continuously produced;

6) The present invention can quickly and economically heat strip steel to a temperature of 900°C or above through the series connection of direct fire heating equipment and jet radiation composite heating device;

7) In the rapid cooling station of this invention, there are four process paths to choose from, and the production process is flexible and diverse;

8) The present invention can realize the continuous production of ultra-high-strength steel with three different surface states: cold rolling, pickling and flash plating.

The beneficial effects of the present invention are:

1) The length of the unit can be shortened by about 1/3 compared with the length of the existing production line;

2) The number of crew members can be reduced, and a crew of 3 or even 2 people can operate;

3) The overall operating cost of the unit is low;

4) The application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. The composition of 450MPa grade products can reach the strength of 590MPa grade products; 780MPa grade products The composition can reach the performance of 980MPa grade products, which can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving the performance of high-strength steel products. Market Competitiveness;

5) Realize rapid heating and rapid cooling of ultra-high-strength steel and shorten the heat treatment cycle time of strip steel;

6) Realize ultra-high-temperature heating of ultra-high-strength steel. The heating temperature of strip steel can be heated to 900°C or even above, thereby achieving ultra-high-temperature heating annealing treatment of ultra-high-strength steel.

Ultra-short process hot-dip galvanized high-strength strip production line

The ultra-short process hot-dip galvanizing high-strength strip steel production line of the present invention can achieve the following purposes: 1) reduce the floor space of the unit; 2) reduce the number of crew members; 3) reduce the overall operating cost of the unit; 4) through the use of rapid heating technology , can generate fine-grained austenite during the heating process of high-strength steel, thereby further improving the strength of high-strength steel; 5) realize rapid heating and rapid cooling of high-strength steel, and shorten the heat treatment cycle time of strip steel; 6) rapid The application of heating, rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. It can not only reduce the production cost of high-strength steel, but also improve the mechanical properties of various high-strength steel products. and subsequent processing performance (such as welding performance, coating performance), significantly improving the market competitiveness of high-strength steel products; 7) Realizing ultra-high temperature heating of high-strength steel, the heating temperature of strip steel can be heated to 900°C or even above, thereby achieving thermal Ultra-high temperature heat annealing treatment of galvanized high-strength steel.

An ultra-short process hot-dip pure zinc high-strength strip steel production line, which includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - outlet looper - flattening - coiling; wherein, the central continuous post The processing station includes a rapid heating section, a soaking section, a rapid cooling section and a hot-dip galvanizing section in sequence; the rapid heating section adopts direct fire heating; or direct fire heating and transverse magnetic induction heating are arranged in series; or direct fire heating, Jet radiation composite heating and transverse magnetic induction heating are arranged in series; the soaking section adopts jet radiation composite soaking, electric radiant tube soaking, resistance wire soaking or resistance band soaking; the rapid cooling section uses high hydrogen cooling; The hot-dip galvanizing section is equipped with furnace nose, zinc pot, air knife, post-plating cooling equipment and final water cooling equipment.

Furthermore, in the hot-dip galvanizing section, alloying heating equipment and alloying heat soaking equipment are installed between the air knife and the post-plating cooling equipment to realize the production of alloyed hot-dip galvanizing products.

Furthermore, in the hot-dip galvanizing section, optional mobile post-plating quick cooling equipment is provided after the air knife and in front of the post-plating cooling equipment.

Preferably, an optional cleaning station is set up between the welding station and the entrance looper station. The strip can be cleaned through the cleaning station, or the cleaning station can be bypassed; or, the entrance looper station An optional cleaning station is set up after the strip, so that when the strip enters the cleaning station for cleaning, constant speed cleaning can be achieved and stable strip surface cleaning quality can be maintained.

Preferably, a central looper station is provided before the leveling station and after the central continuous post-processing station.

Preferably, a tensioning and straightening station is provided between the flattening station and the outlet looper station, and the strip can optionally undergo tensioning and straightening treatment before entering the outlet looper station.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is set up between the flattening station and the outlet looper station. The strip steel can choose to undergo surface treatment such as passivation or fingerprint resistance before entering the outlet looper; or, in There is also a tension and straightening station and a surface post-treatment station such as passivation or fingerprint resistance between the flattening station and the exit looper station. The strip steel can choose to undergo surface treatment such as tension and straightening or/and passivation or fingerprint resistance. Enter the exit looper station.

Preferably, the electric radiant tube soaking section or the resistance wire soaking section or the resistance band soaking section is used instead of the jet radiation composite soaking section to build the production line of the present invention to produce hot-dip galvanized high-strength strip steel in places where gas supply is tight.

2) The hot-dip pure zinc and alloyed hot-dip galvanizing high-strength steel production lines of the present invention require fewer personnel;

4) Through the use of direct fire heating equipment, the present invention can use pre-oxidation-reduction treatment on high-strength steel to improve the plateability of high-strength steel;

5) The present invention realizes the rapid heating and rapid cooling annealing treatment of high-strength steel through the combined use of direct fire heating equipment, transverse magnetic induction heating equipment, jet radiation composite heating/uniform heat device and high hydrogen rapid cooling equipment, and reduces the annealing process. The enrichment of strengthening elements such as Si and Mn in the medium substrate on the surface of the substrate further improves the plateability of high-strength steel;

6) The present invention can quickly heat strip steel to 900°C or even above through the series use of transverse magnetic induction heating equipment, direct fire heating equipment, and jet radiation composite heating/uniform heat devices;

7) The alloyed hot-dip galvanizing high-strength steel production line of the present invention can simultaneously produce hot-dip galvanized products with two coating types: hot-dip pure zinc and alloyed hot-dip galvanizing.

The beneficial effects of the present invention are:

1) The unit is short in length and occupies a small area;

2) The crew configuration is small, and a crew of 4 people can operate;

3) The overall operating cost of the unit is low;

5) Realize rapid heating and rapid cooling of high-strength steel and shorten the heat treatment cycle time of strip steel;

6) Realize ultra-high temperature heating of high-strength steel. The heating temperature of strip steel can be heated to 900°C or even above, thereby realizing ultra-high temperature heating annealing treatment of high-strength steel.

Flexible cold-rolled strip post-processing production line suitable for producing a variety of high-strength steels

The flexible cold-rolled strip post-processing production line of the present invention, which is suitable for producing a variety of high-strength steels, can achieve the following purposes: 1) Fully utilize the waste heat of radiant tube combustion exhaust gas, and can quickly preheat the strip temperature to at least 250°C; 2) After the radiant tube combustion exhaust gas is fully preheated, the temperature of the steel is significantly reduced and can be directly discharged. There is no need to add a boiler or a superheated water heating device for secondary utilization of the waste heat of the combustion exhaust gas, which significantly reduces investment and floor space; 3) Radiant tube combustion The waste heat of the exhaust gas is basically transmitted to the strip, and the primary utilization rate of heat energy is high; 4) Rapid transverse magnetic induction heating is achieved during ultra-high temperature, improving the heat energy utilization rate; 5) The annealing heating temperature and soaking temperature of the strip can be quickly adjusted; 6) The flexible high-strength steel special production line can flexibly produce various new products such as cold rolling, hot-dip pure zinc (GI), alloyed hot-dip galvanizing (GA), cold-rolled surface flash nickel plating or flash zinc plating, etc., so the production The line can better meet market needs; 7) Due to the independent control of the atmosphere in the muffle furnace, the diffusion and enrichment of alloy elements on the surface of high-strength steel can be effectively controlled, so the platingability of ultra-high-strength steel products can be greatly improved. Therefore, the surface quality of ultra-high-strength hot-plated products can also be significantly improved; 8) The rapid heating technology of the present invention combined with the application of rapid cooling technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. Not only can Reducing production costs can also improve the mechanical properties of various ultra-high-strength steel products.

A flexible cold-rolled strip post-processing production line suitable for producing a variety of high-strength steels, which includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate looper - smoothing - outlet loop Set-finishing-coiling; wherein, the central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, an optional transverse magnetic induction heating section or a muffle furnace section, and a jet radiation tube arranged in parallel. Composite soaking section, slow cooling section, rapid cooling section, and reheating section; the rapid cooling section includes high hydrogen cooling or/and aerosol cooling or/and water quenching cooling section; the reheating section is followed by a furnace nose section, Zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section, and final water cooling section; Or, connect to the final water-cooling section through a moving channel, an over-aging section, and a final jet cooling section; after the final water-cooling section, you can choose to set up a pickling section or a pickling section + a flash plating section; the strip can choose to go through the pickling section. To produce cold-rolled pickled products, you can also bypass the pickling section to produce cold-rolled annealed products. After the strip is pickled, you can also choose to enter the flash plating section to produce flash plating products such as flash nickel plating or flash zinc plating; The heating section of the radiant tube burns gaseous fuels such as natural gas, liquefied petroleum gas, or coal gas, and produces high-temperature waste gas during the combustion process. The preheating section of the radiant tube uses the combustion waste gas in the heating section or/and the soaking section to exchange heat in the furnace for heating and recycling. The nitrogen and hydrogen protective gas is then sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; the radiant tube heating section is connected in series with (the optional transverse magnetic induction heating section or muffle furnace section set in parallel); The jet radiation composite soaking section adopts a combination of forced convection and radiation to quickly soak the strip, improve the uniformity of the strip temperature and realize rapid adjustment of the strip soaking temperature; the cold-rolled strip post-processing production line adopts While spraying the radiant tube preheating section, rapid cooling is performed, then reheated, and then galvanized or over-aged; the furnace nose section is arranged in parallel with the moving channel, and the strip passes backward from the furnace nose section through the production heat. Plating pure zinc or alloyed hot-dip galvanizing products, the strip steel passes through the moving channel to produce cold-rolled annealing, or pickling or flash plating products; so far, the processing line has at least three or more optional process paths, which can Realize the production of five different varieties of high-strength steel including cold rolling annealing, pickling, flash plating, hot-dip pure zinc and alloyed hot-dip galvanizing.

Furthermore, an optional tensioning and straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance are arranged between the flattening station and the exit looper station, which can perform tension-levelling and/or surface post-processing on the strip. deal with.

Preferably, the muffle furnace section equipment is equipped with sealing devices at the front and rear, and the muffle furnace section equipment is also equipped with an atmosphere adjustment device, in which the hydrogen content, oxygen content and dew point can be individually adjusted and controlled.

Preferably, a balanced insulation section equipment is also arranged between the reheating section and the furnace nose section, and the strip steel is subjected to insulation treatment before hot-dip galvanizing.

Preferably, a mobile post-plating quick cooling section equipment is also arranged between the air knife section and the post-plating cooling section. The mobile post-plating quick cooling section is arranged in parallel with the alloying heating equipment to achieve hot-dip pure zinc high-strength steel products with post-plating strips. Rapid cooling of steel; preferably, a mobile post-plating rapid cooling section equipment is installed within 10 meters above the air knife section.

Preferably, a secondary reheating section equipment is arranged after the balanced heat preservation section to reheat the balanced heat preservation strip steel twice, and then perform hot-dip galvanizing or over-aging treatment.

Preferably, pickling section equipment is arranged between the rapid cooling section and the reheating section. The pickling section equipment includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit to achieve strip surface cleanliness. Pickling can be used to remove the oxide layer on the surface of strip steel after gas mist cooling or/and water quenching cooling. For hot-dip pure zinc or alloyed hot-dip galvanizing products, it can also improve the reliability of high-strength strip steel, especially ultra-high-strength strip steel. plating properties.

Preferably, flash iron or flash nickel plating equipment is arranged after the pickling section, and then reheated to further improve the plateability of the ultra-high strength strip.

Preferably, the mobile post-plating rapid cooling section adopts mobile jet rapid cooling equipment or mobile mist cooling equipment.

Flexible cold rolling post-processing production line suitable for producing a variety of ultra-high strength strip steel

The flexible cold-rolling post-processing production line of the present invention suitable for producing a variety of ultra-high-strength strip steel can achieve: 1) full utilization of the waste heat of the radiant tube combustion exhaust gas, and can quickly preheat the strip temperature to at least 250°C; 2) ) After the radiant tube combustion exhaust gas is fully preheated, the temperature of the steel is significantly reduced and can be directly discharged. There is no need to add a boiler or superheated water heating device for secondary use, which significantly reduces investment and floor space; 3) The waste heat of the radiant tube combustion exhaust gas is basically transmitted When it reaches the strip steel, the primary utilization rate of heat energy is high; 4) Rapid heating is achieved during ultra-high temperature and the heat energy utilization rate is improved; 5) The annealing heating temperature of the strip steel can be quickly adjusted; 6) The flexible high-strength steel special production line can be flexibly It produces various cold-rolled annealed, hot-dip pure zinc (GI), alloyed hot-dip galvanized (GA), pickling, cold-rolled surface flash nickel plating or flash zinc plating and other new flash plating products, so the production line can better Meet market needs; 7) The plateability of ultra-high-strength steel products can be greatly improved, so the surface quality of ultra-high-strength hot-dip products can also be significantly improved; 8) The present invention, combined with the application of rapid cooling technology, can use lower alloys Ingredients produce various advanced high-strength steel products with higher strength levels, which can not only reduce production costs, but also improve the mechanical properties of various ultra-high-strength steel products.

A flexible cold-rolling post-processing production line suitable for producing a variety of ultra-high-strength steel strips, which includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-intermediate looper-smoothing-export Looper - finishing - coiling; the central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a parallel and optional transverse magnetic induction heating section or a muffle furnace section, and a radiant tube section. The hot section, slow cooling section, rapid cooling section, and reheating section are equipped with two parallel paths starting from the reheating section. One line is the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, The post-plating cooling section is connected to the final water-cooling section; the other section is the moving channel section, the over-aging section, and the final jet cooling section, which is connected to the final water-cooling section; after the final water-cooling section, an optional pickling section and an optional flash plating section are provided. section; the heating section uses gaseous fuels such as natural gas, liquefied petroleum gas or coal gas; the injection radiant tube preheating section uses the radiant tube heating section or/and the radiant tube soaking section to recycle the combustion exhaust gas in the furnace for heat exchange and heating The nitrogen and hydrogen protective gas is then sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; the rapid cooling section includes high hydrogen cooling or/and gas mist cooling or/and water quenching cooling section.

The production line uses a jet radiant tube preheating section and simultaneously uses high hydrogen cooling or mist cooling or/and water quenching cooling to rapidly cool the strip, and then sequentially performs reheating, galvanizing or over-aging treatment.

The furnace nose section and the moving channel section are arranged in parallel. The strip steel passes backward from the furnace nose section to produce hot-dip pure zinc or alloyed hot-dip galvanizing products. The strip steel passes from the moving channel section through the production of cold rolling, annealing, pickling or Flash plated products.

A pickling section and a flash plating section are arranged after the final water-cooling section. The strip steel can choose to pass through the pickling section to produce cold-rolled pickled products, or it can bypass the pickling section to produce cold-rolled annealed products. The strip steel can also be produced after pickling. You can choose to enter the flash plating section to produce flash plating products such as flash nickel plating or flash zinc plating.

So far, the production line has more than three optional process paths, which can produce five different types of high-strength steel including cold rolling annealing, pickling, flash plating, hot-dip pure zinc and alloyed hot-dip galvanizing.

Preferably, an optional tensioning and straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance are provided between the flattening station and the exit looper station, so that the strip can be tensioned and straightened and/or surface post-processed. deal with.

Preferably, a balanced insulation section is arranged between the reheating section and the furnace nose section, and the strip steel is subjected to insulation treatment before hot-dip galvanizing.

Preferably, a movable post-plating quick cooling section is also arranged between the air knife section and the post-plating cooling section. The movable post-plating quick cooling section is arranged in parallel with the alloying heating section to achieve hot-dip pure zinc high-strength steel products after plating strips. Rapid cooling; preferably, a mobile post-plating rapid cooling section is set within 10 meters above the air knife section.

Preferably, a pickling section is arranged between the high hydrogen cooling or mist cooling or/and water quenching cooling section and the reheating section. The pickling section includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit. The dry unit realizes pickling of the strip surface and can be used to remove the oxide layer on the surface of the strip after gas mist cooling or/and water quenching cooling. For hot-dip pure zinc or alloyed hot-dip galvanizing products, it can also improve the special properties of high-strength strip steel. It is the plateability of ultra-high strength strip steel.

Preferably, a flash iron or flash nickel plating section is arranged after the pickling section and before the reheating section, and then reheated, which can further improve the plateability of the ultra-high strength strip.

Preferably, the movable post-plating quick cooling section uses movable jet quick cooling equipment or movable mist cooling equipment.

Flexible cold-rolled strip post-processing line suitable for producing a variety of high-strength steels

The flexible cold-rolled strip post-processing line of the present invention, which is suitable for producing a variety of high-strength steels, can produce ultra-high-strength cold-rolled continuous annealing, pickling, flash plating, hot-dip pure zinc (GI) and alloyed hot-dip galvanizing (GA). For strip steel, this production line can achieve the following purposes: 1) Make full use of the waste heat of the direct-fired furnace exhaust gas to quickly preheat the strip temperature to at least 350°C; 2) Avoid long-term direct contact of the direct-fired combustion exhaust gas in the preheating furnace Strip steel, thereby avoiding the formation of an excessively thick oxide layer on the surface of the strip; 3) Rapid and efficient preheating and direct fire heating can be used to quickly heat the strip temperature to above 750°C, and subsequent use of transverse magnetic induction heating and jet radiation combined heating can Quickly and uniformly heat the strip to above 850°C to achieve rapid, efficient and uniform heating; 4) Thanks to the significant reduction of the heating furnace, the reduced thermal inertia of the furnace and the fast response speed of transverse magnetic induction heating, the strip annealing temperature can be quickly adjusted ; 5) The entire rapid heat treatment furnace can be significantly simplified, miniaturized, and efficient, so it can save energy, reduce emissions, and reduce floor space; 6) The flexible high-strength steel special production line can flexibly produce various cold-rolled annealing, pickling , flash plating, hot-dip pure zinc (GI) and alloyed hot-dip galvanizing (GA) and other products, so this flexible production line can better To meet market needs; 7) The plateability of ultra-high-strength steel products can be greatly improved, so the surface quality of ultra-high-strength hot-dip products can also be significantly improved; 8) The application of rapid heating, rapid cooling and rapid heat treatment technology can be adopted Producing various advanced high-strength steel products with higher strength levels with lower alloy compositions can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing performance (such as welding performance) of various ultra-high-strength steel products.

A flexible cold-rolled strip post-processing line suitable for producing a variety of high-strength steels, which includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate looper - smoothing - outlet looper - Finishing-coiling; wherein, the central continuous post-processing station includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section or a jet radiation composite heating section, a jet radiation composite soaking section, a slow Cold section, rapid cooling section, reheating section; two production lines are arranged in parallel after the reheating section, and one line is equipped with furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating The cooling section is then connected to the final water-cooling section; the other section is provided with a moving channel section, an over-aging section, and a final jet cooling section, and is then connected to the final water-cooling section; after the final water-cooling section, there is an optional pickling section and a flash plating section. ; The rapid cooling section includes high hydrogen cooling or mist cooling or/and water quenching cooling section; the direct fire heating section burns gaseous fuels such as natural gas or liquefied petroleum gas; the injection direct fire preheating section utilizes direct fire heating The combustion exhaust gas in the section heats the recycled nitrogen and hydrogen protective gas by heat exchange in the furnace, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; the transverse magnetic induction heating section or the jet radiation composite heating section is connected in parallel Or arranged in series; an optional tensioning and straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance is set between the flattening station and the outlet looper station; the jet radiation composite soaking section adopts forced A rapid heat soaking method that combines convection and radiation; so far, the production line has more than three optional process paths, which can realize five different varieties of cold rolling annealing, pickling, flash plating, hot-dip pure zinc and alloyed hot-dip galvanizing Production of high-strength steel.

Further, a radiant tube heating section is provided between the jet radiation composite heating section and the jet radiation composite soaking section.

Furthermore, a balanced insulation section is arranged between the reheating section and the furnace nose section.

In addition, a secondary reheating section is arranged after the equalization heat preservation section, and the secondary reheating section connects the moving channel section and the furnace nose section.

In addition, a movable post-plating quick cooling section is set between the air knife section and the post-plating cooling section. The movable post-plating quick cooling section is arranged in parallel with the alloying heating equipment; preferably, it is set within 10 meters above the air knife section. Move the post-plating rapid cooling section.

Preferably, a pickling section is provided between the rapid cooling section and the reheating section, and the pickling section includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit.

Preferably, a flash iron or flash nickel plating section is provided after the pickling section and before the reheating section, and then the reheating section is connected.

Flexible production line for producing various high-strength/ultra-high-strength steels

The flexible production line of the present invention for producing various high-strength/ultra-high-strength steels can achieve the following purposes: 1) Fully utilize the waste heat of direct-fired combustion exhaust gas to quickly preheat the strip temperature to at least 350°C; 2) Avoid direct-fire combustion exhaust gas waste heat. Fire burning exhaust gas in The preheating furnace is in direct contact with the strip steel for a long time, thereby avoiding the formation of an excessively thick oxide layer on the surface of the strip steel; 3) Rapid and efficient preheating and direct fire heating can be used to quickly heat the strip steel temperature to above 750°C, which can be used horizontally in conjunction with subsequent use. Magnetic induction heating and jet radiation combined heating can quickly and evenly heat the strip steel to above 850°C, achieving rapid, efficient and uniform heating; 4) Thanks to the significant reduction of the heating furnace, the reduction of the thermal inertia of the furnace and the fast response speed of transverse magnetic induction heating, it can Achieve rapid adjustment of strip annealing temperature; 5) The entire rapid heat treatment furnace can be significantly simplified, miniaturized, and efficient, so it can save energy, reduce emissions, and reduce floor space; 6) The flexible high-strength steel production line can flexibly produce various A variety of flash plating products such as cold-rolled annealing, hot-dip pure zinc (GI), alloyed hot-dip galvanizing (GA), cold-rolled surface flash nickel plating or flash zinc plating, so this flexible production line can better meet market needs; 7) The plateability of ultra-high-strength steel products can be greatly improved, so the surface quality of ultra-high-strength hot-dip products can also be significantly improved; 8) The application of rapid heating, rapid cooling and rapid heat treatment technology can use lower alloys The production of various advanced high-strength steel products with higher strength levels using ingredients can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products.

A flexible production line for producing a variety of high-strength/ultra-high-strength steels, which includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate looper - smoothing - outlet looper - finishing -Reeling; where,

The central continuous post-processing station includes a spray direct fire preheating section, a heating section, a radiant tube soaking section, a slow cooling section, a rapid cooling section, a reheating section and two parallel processing lines, a final water cooling section and Optional pickling section and flash plating section;

One of the processing lines includes the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section; the other processing line includes a moving channel section, an overaging section, and a final jet cooling section;

The heating section adopts a direct fire heating section, a transverse magnetic induction heating section and/or a jet radiation composite heating section;

The transverse magnetic induction heating section and the jet radiation composite heating section are arranged in parallel or in series;

The rapid cooling section includes high hydrogen cooling or mist cooling or/and water quenching cooling;

An optional tensioning and straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance are also arranged between the flattening station and the exit looper station.

Preferably, the optional pickling section includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit to realize pickling of the strip surface and can be used for aerosol cooling or/and water quenching cooling. The removal of the oxide layer on the surface of the strip steel can also be used to improve the coating bonding strength of subsequent flash plating.

Furthermore, radiant tube heating equipment is installed between the jet radiation composite heating section and the radiant tube soaking section. After the strip is heated by transverse magnetic induction heating or jet radiation composite heating, it can also be heated by the radiant tube, and then the radiant tube is heated. Of course, with After the steel jet radiation composite heating, the radiant tube can also be directly heated.

Furthermore, a balanced insulation section is set up between the reheating section and the furnace nose section, and the strip steel is thermally insulated before hot-dip galvanizing.

In addition, a movable post-plating quick cooling section equipment is installed between the air knife section and the post-plating cooling section. The movable post-plating quick cooling section is in contact with the alloy. The heating sections are arranged in parallel to achieve rapid cooling of the post-plated strip of hot-dip pure zinc high-strength steel products; preferably, a mobile post-plating rapid cooling section equipment is set up within 10 meters above the air knife section.

Preferably, the moving post-plating quick cooling section adopts a moving jet quick cooling section or/and a moving aerosol quick cooling section; when a moving jet quick cooling section and a moving aerosol quick cooling section are set up at the same time, the two process sections are connected in parallel. Arrangement, choose one during production to achieve rapid cooling of the plated strip.

Furthermore, a secondary reheating section is set up after the balanced heat preservation section, and the strip steel with balanced heat preservation is reheated twice, and then hot-dip galvanized or over-aged.

Preferably, a pickling section is provided between the rapid cooling section and the reheating section. The pickling section includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit to realize pickling of the strip surface. It can be used In addition to removing the oxide layer on the surface of the strip after gas mist cooling or/and water quenching, it can also improve the plating properties of high-strength strips, especially ultra-high-strength strips, for hot-dip pure zinc or alloyed hot-dip galvanizing products.

Preferably, in the heating section, a direct fire heating section, a radiant tube heating section, a transverse magnetic induction heating section or a jet radiation composite heating section are arranged in sequence.

An optional tension-leveling station and/or equipment for surface post-treatment stations such as passivation or fingerprint resistance are also arranged between the flattening station and the exit looper station, which can perform tension-leveling and/or surface post-processing on the strip. deal with.

In the flexible production line design of the present invention for producing various high-strength/ultra-high-strength steels:

The heating section burns gaseous fuels such as natural gas, liquefied petroleum gas, or coal gas, and produces high-temperature waste gas during the combustion process. The injection direct-fire preheating section uses the heating section combustion waste gas to exchange heat in the furnace to heat the recycled nitrogen and hydrogen protective gas. The nitrogen and hydrogen protective gas is then sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange.

The transverse magnetic induction heating section or the jet radiation composite heating section is used for rapid heating of strip steel. It can be arranged in parallel or in series. The transverse magnetic induction heating can be selected according to the peak and valley electricity prices to reduce production costs.

The furnace nose section and the moving channel section are arranged in parallel, the strip steel passes backward from the furnace nose section to produce hot-dip pure zinc or alloyed hot-dip galvanizing products, and the strip steel passes from the moving channel section to produce cold-rolled or flash-plated products;

The production line uses a spray direct fire preheating section and simultaneously uses high hydrogen cooling or mist cooling or/and water quenching cooling for rapid cooling, then reheating, and then galvanizing or over-aging treatment.

The production line has at least three or more optional process paths, which can produce five different types of high-strength steel including cold rolling annealing, pickling, flash plating, hot-dip pure zinc and alloyed hot-dip galvanizing.

The differences or innovations between the above-mentioned flexible production line of the present invention and the traditional continuous heat treatment line include:

1. The present invention originally adopts the injection direct-fire preheating section to preheat the strip of steel, or more precisely, the high-temperature nitrogen and hydrogen protective gas injection direct-fire preheating section. This is a concentrated expression of the novelty, creativity and practicability of the present invention. Its significant features that are different from ordinary preheating sections are: ① Using a heat exchanger in the furnace (the heat exchanger is not arranged outside the furnace) for heating and recycling nitrogen and hydrogen protection Gas, heated nitrogen and hydrogen protective gas is sprayed into the upper and lower surfaces of the strip at high speed to force convection heat exchange to achieve rapid and efficient preheating. For hot strip steel, compared with the traditional preheating method, this method significantly reduces the heat loss of the furnace shell and protective gas channel, makes full use of the waste heat of the combustion exhaust gas, has higher heating efficiency and faster heating rate; ② In injection direct fire preheating In the section, the combustion exhaust gas from the heating section passes through the heat exchanger chamber of the preheating section. During the passing process, the combustion exhaust gas from the heating section fully exchanges heat with the heat exchanger in the heat exchanger chamber to heat the nitrogen and hydrogen protective gas. Therefore, during the injection The combustion exhaust gas of the heating section in the direct-fire preheating section is not always in direct contact with the strip (when the heating section is heated by direct fire, the injection direct-fired preheating section is only in direct contact with the high-temperature section for a short time and the exhaust gas at this time belongs to a reducing atmosphere or Micro-oxidizing atmosphere), thereby avoiding overoxidation of the strip surface; ③ When the heating section is heated by direct fire, the incompletely burned gas in the direct-fire combustion exhaust gas is enriched with oxygen in the semi-sealed unit at the top of the jet preheating section. Secondary combustion, but the burning flame does not contact the strip steel, thus effectively avoiding overoxidation of the strip steel surface; ④ The strip steel preheating temperature is higher. When the heating section uses direct fire heating, due to the high-temperature nitrogen and hydrogen protective gas injection direct fire preheating The heat transfer coefficient is high, and the preheated strip temperature can reach at least 350°C and above, which is at least 100°C higher than the strip temperature in the ordinary preheating section; ⑤ When the heating section is heated by direct fire, the injection method of the present invention The temperature of the direct-fired combustion exhaust gas coming out of the direct-fired preheating section is usually much lower than 750°C (if a sufficient number of high-speed injection preheating units are arranged, it can even be directly discharged below 200°C). There is no need to mix cold air for secondary use outside the furnace. Or no need for secondary use at all.

2. The present invention has at least three or more optional process paths;

3. The present invention can realize the production of five different types of high-strength steel, especially ultra-high-strength steel, including cold rolling annealing, pickling, flash plating, hot-dip pure zinc and alloyed hot-dip galvanizing;

4. The present invention can perform surface post-treatment such as tension straightening or/and passivation or fingerprint resistance on five different varieties of ultra-high-strength steel;

5. The present invention is equipped with secondary reheating section equipment, which realizes two rises in strip temperature before hot-dip galvanizing or over-aging treatment, and can quickly cool the third-generation high-strength steel (QP steel) products to a lower temperature. , and then immediately heated to a higher temperature for a long time carbon redistribution treatment, and after the treatment is completed, it is quickly reheated to the temperature of the hot-dip galvanizing pot for galvanizing;

6. The heating section of the present invention preferably uses a direct-fire heating section, and a rapid heating equipment is provided after the direct-fire heating section. The rapid heating equipment can either use transverse magnetic induction heating section equipment or a jet radiation composite heating device. Of course, it can also be used. The transverse magnetic induction heating section equipment and the jet radiation composite heating device can be selected at the same time. However, when the transverse magnetic induction heating section equipment and the jet radiation composite heating device are selected at the same time, the jet radiation composite heating device should be arranged after the transverse magnetic induction heating section equipment. The simultaneous use of the jet direct fire preheating section and the subsequent rapid heating equipment is another embodiment of the novelty, creativity and practicability of the present invention. When only the transverse magnetic induction heating section equipment is selected, it is recommended that the subsequent section select the radiation heating device first, and then the soaking section equipment; however, when the jet radiation composite heating section equipment is selected, it is recommended that the radiation heating section equipment is no longer selected. The beneficial effects of using rapid heating equipment in the present invention are mainly reflected in: ① It can realize rapid adjustment of the soaking temperature of strip steel, which is very critical for the production of high-strength steel, especially ultra-high-strength steel, and can reduce the risk of strip steel caused by excessive soaking temperature. The performance does not match the quality loss; ② Transverse magnetic induction heating can heat strip steel to a higher temperature more economically and conveniently. Transverse magnetic induction heating has achieved rapid heating of strip steel to 930°C, achieving ultra-high temperatures that cannot be achieved with traditional radiant tube heating. Annealing; ③ Heating The temperature uniformity of the final strip is good, and the temperature uniformity along the width direction of the strip can be controlled within ±5°C; ④ Since the significant increase in heating rate can refine the grain structure and improve the strong plasticity of the material, it is suitable for high-strength steel and ultra-high-strength steel. Performance improvements and cost reductions in steel products are particularly beneficial.

7. The present invention arranges flash plating section equipment in front of the leveling station after the final water cooling section. The strip steel can choose to pass through the flash plating section or bypass the flash plating section, thereby realizing the processing of cold-rolled high-strength steel, especially cold-rolled steel. Surface modification of ultra-high strength steel.

8. The present invention also arranges optional pickling section equipment before the flash plating section after the final water cooling section, which can be used to remove the oxide layer on the surface of the strip after gas mist cooling or/and water quenching cooling, and can also be used to improve subsequent flash plating. Coating bonding strength of plating.

9. The present invention also arranges a pickling section or/and flash iron plating or flash nickel plating section equipment after the strip is quickly cooled to realize pickling of the strip surface, which can be used for gas mist cooling or/and water quenching to cool the strip. The removal of the surface oxide layer can also improve the platingability of high-strength strip steel, especially ultra-high-strength strip steel, for hot-dip pure zinc or alloyed hot-dip galvanized products.

The beneficial effects of the above-mentioned flexible production line of the present invention include:

1) Direct-fire heating has a high primary utilization rate of waste heat of combustion exhaust gas, and can preheat the strip temperature to at least 350°C;

2) It avoids the direct fire combustion exhaust gas from directly contacting the strip for a long time in the preheating furnace, and avoids the formation of an excessively thick oxide layer on the surface of the strip;

3) The secondary ignition combustion flame of excess gas in the direct fire combustion exhaust gas will not contact the strip steel, which can also avoid the formation of an excessively thick oxide layer on the surface of the strip steel;

4) When transverse magnetic induction heating is used, the strip steel can be quickly and economically heated to above 850°C or even above 900°C, and ultra-high temperature annealing can be achieved, thereby producing various new ultra-high-strength steel products;

5) The temperature uniformity of the strip after rapid heating is good, and the temperature uniformity along the width of the strip can be controlled within ±5°C;

6) It can realize rapid adjustment of heating and soaking temperature of various high-strength strip steel;

7) The same production line can produce continuous cold-rolled DP steel, MS steel, TRIP steel, QP steel and hot-dip galvanized DP steel, MS steel, TRIP steel, QP steel and other ultra-high-strength steel products, and adopts rapid heat treatment technology The various high-strength steel products produced have better performance and lower cost;

8) Using water mist cooling + pickling or + pickling and flash nickel plating, martensitic ultra-high-strength steel with a strength of up to 1500MPa can be produced, with high surface quality and plate shape quality. The strip can be plated during hot-dip galvanizing It has good corrosion resistance, excellent coating quality, and can produce new hot-dip galvanized tempered martensitic steel products with excellent overall performance;

9) The present invention can realize the pre-oxidation and reduction process by adjusting the air-fuel ratio of the direct-fired burner in the direct-fired section, and the plateability of ultra-high-strength steel is better.

Continuous withdrawal or hot-dip galvanizing dual-purpose ultra-high strength strip production line

The continuous retreat or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line of the present invention can achieve the following purposes: 1) It can be used according to market demand. The production of continuous withdrawal products or hot-dip galvanized products can be flexibly selected according to the quantity; 2) The preheating temperature of the strip can be increased to about 350°C to transfer the combustion heat to the strip as much as possible; 3) The temperature of the exhaust gas after preheating It is low and can be reused outside the furnace without adding cold air; 4) Avoid direct fire combustion waste gas from contacting the strip for a long time; 5) Ultra-high temperature annealing above 900°C can be achieved; 6) Through the use of rapid heating technology, it can During the heating process of high-strength steel, fine-grained austenite is generated, which can further improve the strength of high-strength steel; 7) Realize rapid heating and rapid cooling of high-strength steel, shortening the heat treatment cycle time of strip steel; 8) Rapid heating, The application of rapid cooling and rapid heat treatment technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. It can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and follow-up of various high-strength steel products. Processing performance (such as welding performance, coating performance); 9) Improve soaking and achieve rapid adjustment of strip soaking temperature.

A continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip production line, which includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, The central continuous post-processing station includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a rapid cooling section, and a reheating section. , the reheating section is equipped with two processing lines arranged in parallel. One line is equipped with a furnace nose section, a zinc pot section, an air knife section, a post-plating cooling section, and is connected to the final water cooling section; the other line is equipped with a moving channel section and an over-aging section. , the final jet cooling section, connected to the final water cooling section; the production line uses jet direct fire preheating to preheat the strip, and sets up transverse magnetic induction heating equipment after the direct fire heating section to quickly increase the heating temperature, and selects high Hydrogen cooling performs rapid cooling; the injection direct-fire preheating section uses the direct-fire heating section to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then sprays the nitrogen and hydrogen protective gas to the upper and lower surfaces of the strip to achieve forced convection. Heat; the rapid cooling section adopts a high hydrogen cooling section, aerosol cooling section or water quenching cooling section.

Furthermore, a balanced heat preservation section and a secondary reheating section are arranged in sequence after the reheating section, and then connected to the two processing lines arranged in parallel.

Furthermore, the hot-dip galvanizing is alloyed hot-dip galvanizing, and an alloying heating section and an alloying soaking section are provided between the air knife section and the post-plating cooling section.

In addition, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength steel strip production line of the present invention includes the following stations in order: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-exit looper-coil Wherein, the central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a rapid cooling section. section, pickling section, and reheating section; the self-reheating section is equipped with two processing lines arranged in parallel. One line is equipped with a furnace nose section, a zinc pot section, an air knife section, a post-plating cooling section, and is connected to the final water cooling section; the other line There is a moving channel section, an over-aging section, and a final air jet cooling section connected to the final water cooling section; the rapid cooling section adopts an air mist cooling section or/and a water quenching cooling section.

In this production line, the strip steel is preheated using a spray direct-fire preheating section, and a transverse magnetic induction heating section is installed after the direct-fire heating section. The hot section can quickly increase the heating temperature, and set up aerosol cooling or/and water quenching cooling for rapid cooling;

The described injection direct fire preheating section uses the direct fire heating section combustion exhaust gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then injects the nitrogen and hydrogen protective gas to the upper and lower surfaces of the strip to achieve forced convection heat exchange.

Furthermore, a balanced heat preservation section and a secondary reheating section are arranged in sequence after the reheating section, and the secondary reheating section is connected to the two parallel processing lines.

Furthermore, hot-dip galvanizing is alloyed hot-dip galvanizing, and an alloying heating section and an alloying soaking section are provided between the air knife section and the post-plating cooling section.

Furthermore, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip production line according to the present invention includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-outlet looper- Coiling; wherein, the central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a rapid The cooling section, pickling section, and reheating section; the self-reheating section is equipped with two parallel processing lines, one of which is equipped with a furnace nose section, a zinc pot section, an air knife section, a post-plating cooling section, and is connected to the final water-cooling section; There is a moving channel section, an over-aging section and a final jet cooling section along the way, connected to the final water cooling section; the rapid cooling section adopts a high hydrogen cooling section, an aerosol cooling section or/and a water quenching cooling section, and the high hydrogen cooling section The cooling section is arranged in parallel with the aerosol cooling section or/and the water quenching cooling section, and the high hydrogen cooling section is connected to the reheating section; in this production line, the strip steel is preheated by a spray direct fire preheating section, and is heated in a direct fire A transverse magnetic induction heating section is set up after the section to quickly increase the heating temperature, and aerosol cooling or/and water quenching cooling are set up for rapid cooling; the injection direct-fire preheating section uses the combustion exhaust gas of the direct-fire heating section to be heated and recycled in the furnace of nitrogen and hydrogen protective gas, and then spray the nitrogen and hydrogen protective gas onto the upper and lower surfaces of the strip to achieve forced convection heat exchange.

Preferably, a movable post-plating quick cooling section is arranged after the air knife section. The movable post-plating quick cooling section can move online or offline and is arranged in parallel with the alloying heating section.

Preferably, a radiant tube heating section is added between the direct fire heating section and the transverse magnetic induction heating section.

Preferably, a finishing station is provided before the coiling station.

Preferably, an intermediate looper station is also provided before the leveling station.

Preferably, an optional tensioning and straightening station is provided between the leveling station and the outlet looper station, and the strip can be tensioned and straightened before entering the outlet looper.

Preferably, an optional surface post-treatment station such as passivation or fingerprint resistance is provided between the flattening station and the outlet looper station.

Preferably, an optional tensioning and straightening station and an optional surface post-treatment station such as passivation or fingerprint resistance are simultaneously provided between the flattening station and the exit looper station.

1. The present invention uses injection direct-fire preheating section equipment to preheat the strip. The injection direct-fire preheating section equipment uses the direct-fire heating section combustion exhaust gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then uses the nitrogen and hydrogen to The protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange, which can fully utilize the waste heat of radiant tube combustion online and preheat the strip temperature to at least 350°C.

The preheating device adds a heat exchange and jet air box unit in the preheating furnace, and uses heated nitrogen and hydrogen protective gas to be sprayed onto the upper and lower surfaces of the strip at high speed to force convection heat exchange to achieve rapid and efficient preheating of the strip. This method is different from the traditional method. Compared with the preheating method, the heat loss of the furnace shell and protective gas channel is significantly reduced, the waste heat of direct combustion exhaust gas is more fully utilized, the heating efficiency is higher, and the heating rate is faster. The direct-fired exhaust gas is used to heat the gas in the jet air box and the steel strip is preheated by the jet through the nozzle. Compared with the existing technology, the preheating efficiency is further improved, and the heat of the direct-fired exhaust gas is more fully utilized.

The preheating device is designed with heat exchange into the preheating furnace. The direct-fired combustion exhaust gas mainly passes through the preheating furnace heat exchange and jet wind box unit. During the passing process, the direct-fired combustion exhaust gas fully exchanges with the heat exchange pipes in the windbox. Heat exchange, heating nitrogen and hydrogen protective gas in the wind box, so the direct fire combustion exhaust gas in the preheating furnace is not always in direct contact with the strip (only in the high temperature section for a short period of time and the exhaust gas is a reducing atmosphere or a slightly oxidizing atmosphere. ), thereby avoiding overoxidation of the strip surface.

The preheating device is designed with a direct-fire combustion exhaust gas secondary combustion chamber and an open flame burner in the preheating furnace. The incompletely burned gas in the direct-fire combustion exhaust gas is recharged in the semi-sealed direct-fire combustion exhaust gas on the top of the preheating furnace. Oxygen-rich secondary combustion is carried out in the combustion chamber, but the combustion flame does not contact the strip steel, thus effectively avoiding overoxidation of the strip steel surface.

When the preheating device is used for preheating, the preheating temperature of the strip is higher. Due to the high heat transfer coefficient of high-temperature nitrogen and hydrogen protective gas injection and direct fire injection preheating, the temperature of the strip after preheating can reach more than 350°C, which is higher than that of ordinary preheating. The temperature of the hot furnace strip is at least 100°C higher;

The temperature of the direct-fired combustion exhaust gas coming out of the preheating furnace is usually much lower than 750°C (if a sufficient number of high-speed injection preheating units are arranged, it can even be directly discharged below 200°C), and there is no need to mix cold air for secondary use outside the furnace. Or no need for secondary use at all. It can be seen that the preheating device not only realizes full utilization of the waste heat of the direct-fired furnace exhaust gas, but also avoids excessive oxidation of the strip surface caused by the direct-fired furnace exhaust gas contacting the strip for a long time.

A transverse magnetic induction heating section is set after the direct fire heating section. The transverse magnetic induction heating is used for further rapid lifting of high-temperature strip steel and can achieve ultra-high temperature annealing of high-strength steel.

2. The present invention sets up a secondary reheating section to achieve two rises in strip temperature before hot-dip galvanizing, allowing third-generation high-strength steel (QP steel) products to be quickly cooled to a lower temperature and then quickly heated immediately. The carbon is redistributed to a higher temperature for a long time, and after the treatment is completed, it is quickly reheated to the temperature of the hot-dip galvanizing pot for galvanizing.

3. This invention can flexibly select four different cooling paths to produce continuous withdrawal products or hot-dip galvanized products;

4. Through the combined use of transverse magnetic induction heating equipment and a variety of rapid cooling equipment, rapid heating, rapid cooling and annealing can be achieved, and rapid heat treatment of high-strength strip steel can be continuously produced;

5. The present invention uses jet radiation composite soaking instead of radiant tube soaking, which can realize rapid adjustment of the strip soaking temperature when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change;

6. The present invention can realize the continuous production of strip steel products with three different surface states: cold-rolled annealing, hot-dip pure zinc and alloyed hot-dip galvanizing.

The beneficial effects of the present invention are:

1) This invention can flexibly choose the production of continuous withdrawal products or the production of hot-dip galvanized products;

2) This invention avoids the direct fire combustion exhaust gas from contacting the strip for a long time, and the strip has good surface quality and plateability;

3) In the present invention, the strip temperature is high after preheating, and the primary utilization rate of heat energy is high;

4) The present invention uses transverse magnetic induction heating for further rapid improvement of high-temperature strip steel, and can realize ultra-high temperature annealing of high-strength steel;

5) The present invention uses secondary reheating equipment to achieve two rises in strip temperature before hot-dip galvanizing, allowing third-generation high-strength steel (QP steel) products to be quickly cooled to a lower temperature and then quickly heated immediately. Carry out long-term carbon redistribution treatment to a higher temperature, and after the treatment is completed, it is quickly reheated to the temperature of the hot-dip galvanizing pot to perform galvanizing treatment;

6) The application of the rapid heating, rapid cooling and rapid heat treatment process technology of the present invention can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. The composition of 450MPa grade products can reach the strength of 590MPa grade products; 780MPa The composition of grade products can reach the performance of 980MPa grade products, which can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving high-strength steel Product market competitiveness;

7) The present invention realizes rapid heating and rapid cooling of ultra-high-strength steel and shortens the heat treatment cycle time of strip steel;

8) The present invention uses jet radiation composite soaking instead of radiant tube soaking, which can realize rapid adjustment of the strip soaking temperature when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

Continuous withdrawal or hot-dip galvanizing dual-purpose high-strength strip production line

The continuous withdrawal or hot-dip galvanizing dual-purpose high-strength strip production line of the present invention can achieve the following purposes: 1) The production of continuous withdrawal products or the production of hot-dip galvanized products can be flexibly selected according to market demand; 2) The preheating temperature of the strip can be adjusted Raise it to about 250°C to transfer the combustion heat to the strip as much as possible; 3) The temperature of the exhaust gas after preheating is low, the exhaust gas temperature can be reduced to below 200°C, and it can be directly discharged without secondary use outside the furnace. Of course, Water can be heated for further utilization of waste heat; 4) Ultra-high temperature annealing above 900°C can be achieved; 5) Through the use of rapid heating technology, fine-grained austenite can be generated during the heating process of high-strength steel, thereby further improving the high-strength The strength of steel; 6) Realize rapid heating of high-strength steel, Rapid cooling treatment shortens the heat treatment cycle time of strip steel; 7) The application of rapid heating, rapid cooling and rapid heat treatment process technology can use lower alloy components to produce various advanced high-strength steel products with higher strength levels, which can not only reduce the high strength Steel production costs can also be improved, and the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various high-strength steel products can be improved, significantly improving the market competitiveness of high-strength steel products; 8) Improving uniform heat distribution and realizing uniform heating of strip steel Quick temperature adjustment.

A continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line, which includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, the The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a soaking section, a slow cooling section, a rapid cooling section, a reheating section, and a parallel arrangement (furnace nose section + zinc Pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section ; The rapid cooling section includes a high hydrogen cooling section or/aerosol cooling section or/water quenching cooling section.

Furthermore, a balanced heat preservation section and a secondary reheating section are provided after the reheating section, and the secondary reheating section is connected to the parallel-arranged (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (Moving channel section + over-aging section + final jet cooling section).

In addition, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line of the present invention includes the following stations in order: uncoiling-welding-entry looper-cleaning-central continuous post-processing-levelling-exit looper-coiling ; Wherein, the central continuous post-processing station includes a spray radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a soaking section, a slow cooling section, a rapid cooling section, a pickling section, and a reheating section. The (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section) and final water cooling section are arranged in parallel; the soaking section uses radiant tubes for equalization. Hot section or jet radiation composite soaking section; the rapid cooling section includes an aerosol cooling section and a water quenching cooling section. The strip can choose aerosol cooling or water quenching cooling, or you can choose aerosol cooling first and then water quenching cooling.

Furthermore, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-exit looper-coil Take; wherein, the central continuous post-processing station includes a spray radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a soaking section, and a slow down section. Cold section, rapid cooling section, pickling section, reheating section, parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving Channel section + over-aging section + final jet cooling section), final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the rapid cooling section adopts a high hydrogen cooling section, aerosol cooling section or/and water quenching cooling section, and the high hydrogen cooling section is arranged in parallel with the gas mist cooling section or/and the water quenching cooling section, and the high hydrogen cooling section is connected to the reheating section.

Preferably, a movable post-plating quick cooling section is arranged after the air knife section, and is arranged in parallel with the alloying heating section, so that the post-plating quick cooling section forms an online and offline switching design. When producing hot-dip pure zinc products, the movable post-plating quick cooling section is online to quickly cool the plated strip. At this time, the alloying heating section is offline; when producing alloyed hot-dip galvanized products, the movable post-plating quick cooling section is offline. At this time, the alloying heating section is online and the strip steel is alloyed and heated.

Preferably, a flash nickel or flash iron section is provided before the reheating section to improve the corrosion resistance or plateability of the strip.

Preferably, an intermediate looper station is set up before the smoothing station so that the smoothing machine can replace the work rolls online without losing the strip quality.

Preferably, an optional surface post-processing station such as passivation or fingerprint resistance is provided between the flattening station and the exit looper station. The strip steel can be subjected to surface post-processing such as passivation or fingerprint resistance before entering the outlet loop. set.

Preferably, an optional tensioning and straightening station equipment and an optional passivation or fingerprint-resistant surface post-treatment station are simultaneously provided between the flattening station and the exit looper station. The strip steel can be passivated or fingerprint-resistant. Wait for surface post-processing before entering the outlet looper.

1) The present invention uses a jet radiant tube preheating section equipment to preheat the strip. The jet radiant tube preheating section equipment uses the combustion exhaust gas of the radiant tube heating section to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then uses the nitrogen Hydrogen protective gas is injected into The upper and lower surfaces of the strip realize forced convection heat exchange, which can fully utilize the waste heat of the radiant tube combustion online and preheat the strip temperature to at least 250°C. The injection radiant tube injection preheating section is one of the core technologies of the present invention. .

2) The transverse magnetic induction heating section equipment is installed after the radiant tube heating section of the present invention. This transverse magnetic induction heating is used to further rapidly improve high-temperature strip steel and can realize ultra-high temperature annealing of high-strength steel;

3) This invention can flexibly select four different cooling paths to produce continuous withdrawal products or hot-dip galvanized products;

4) The present invention realizes rapid heating, rapid cooling and annealing through the use of transverse magnetic induction heating equipment and a variety of rapid cooling equipment, and can continuously produce rapid heat treatment high-strength strip steel;

5) The present invention uses jet radiation composite soaking instead of radiant tube soaking, which can realize rapid adjustment of the strip soaking temperature when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

6) The present invention can realize the continuous production of strip steel products with three different surface states: cold rolling annealing, hot-dip pure zinc and alloyed hot-dip galvanizing.

7) The present invention's technical solution of setting up secondary reheating section equipment realizes two rises in strip temperature before hot-dip galvanizing, and can realize rapid cooling of third-generation high-strength steel (QP steel) products to a lower temperature. Then it is quickly heated to a higher temperature for a long time carbon redistribution treatment. After the treatment is completed, it is quickly reheated to the hot-dip galvanizing pot temperature for a second time to perform galvanizing treatment.

The beneficial effects of the present invention are:

2) In the present invention, the strip temperature is high after preheating, and the primary utilization rate of heat energy is high;

3) The present invention uses transverse magnetic induction heating for further rapid improvement of high-temperature strip steel, and can realize ultra-high temperature annealing of high-strength steel;

4) The present invention uses secondary reheating equipment to achieve two rises in strip temperature before hot-dip galvanizing, allowing third-generation high-strength steel (QP steel) products to be quickly cooled to a lower temperature and then quickly heated immediately. Carry out long-term carbon redistribution treatment to a higher temperature, and after the treatment is completed, it is quickly reheated to the temperature of the hot-dip galvanizing pot to perform galvanizing treatment;

5) The application of the rapid heating, rapid cooling and rapid heat treatment process technology of the present invention can use lower alloy components to produce various advanced high-strength steel products with higher strength levels. The composition of 450MPa grade products can reach the strength of 590MPa grade products; 780MPa The composition of grade products can reach the performance of 980MPa grade products, which can not only reduce the production cost of high-strength steel, but also improve the mechanical properties and subsequent processing properties (such as welding performance and coating performance) of various ultra-high-strength steel products, significantly improving high-strength steel Product market competitiveness;

6) The present invention realizes rapid heating and rapid cooling of ultra-high-strength steel and shortens the heat treatment cycle time of strip steel;

7) The present invention uses jet radiation composite soaking instead of radiant tube soaking, which can realize rapid adjustment of the strip soaking temperature when strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

Injection direct fire preheating device

The injection direct fire preheating device used in each production line of the present invention includes: a direct fire furnace and a preheating furnace; wherein,

The direct-fired stove includes:

The furnace shell has a top roller chamber and a furnace bottom roller chamber respectively at its upper and lower ends; the top roller chamber and the furnace bottom roller chamber are respectively equipped with steering rollers; several direct-fire heating zones are set up along the height direction in the furnace shell. Several direct-fire burners are provided; at least two through holes are provided on the upper side wall of the furnace shell, and they are arranged symmetrically left and right;

The preheating furnace includes:

The upper side wall of the furnace body is provided with at least two connection holes, which are arranged symmetrically left and right, and are connected to the through holes in the upper part of the furnace shell of the direct furnace through communication pipes; the top of the furnace body is provided with a roller chamber corresponding to the top of the furnace , a furnace throat for strip steel to pass through; the bottom of the furnace body is equipped with a strip steel inlet and a corresponding sealing device and a steering roller; an upper partition with holes is provided in the upper part of the furnace body to form an upper gas collecting chamber for direct-fired exhaust gas; direct-fired A direct-fired combustion exhaust gas secondary combustion chamber is provided below the upper exhaust gas collection chamber, and at least one open flame burner is installed in the direct-fired combustion exhaust gas secondary combustion chamber; preferably, a combustion exhaust gas measuring chamber is also provided in the direct-fired combustion exhaust gas secondary combustion chamber. Thermometer; a lower partition with holes is provided in the lower part of the furnace body to form a direct-fire exhaust gas lower gas collecting chamber, and is connected to an exhaust gas fan through an exhaust gas discharge pipe; a control valve is provided on the exhaust gas discharge pipe;

Several heat exchange and jet air box units are arranged on both sides of the furnace body below the direct-fired combustion exhaust gas secondary combustion chamber along the height direction of the furnace body, with a belt passage for the strip to pass through; each heat exchange and jet air box unit is The bellows unit includes,

The air box body has a number of heat exchange tubes vertically arranged inside it, and a number of nozzles are arranged on one side of the air box body relative to the belt passage; an exhaust gas secondary mixing chamber connected to the heat exchange tubes is arranged between the upper and lower air box bodies. ;Put nitrogen and hydrogen protective gas into the wind box;

Circulation fan, the port of its inlet pipe is arranged in the belt passage, and the port of its outlet pipe is located in the wind box;

A number of sealing devices for the steel strip to pass through are respectively provided at the upper and lower ports of the belt passing passage and at the belt passing holes of the upper and lower partitions; preferably, the sealing device is a nitrogen sealing structure and adopts nitrogen sealing chamber with a nitrogen injection pipeline.

During the production process, the high-temperature combustion exhaust gas generated by the direct-fire combustion of the direct-fired furnace enters the preheating furnace through the connecting pipe. The preheating furnace is equipped with multiple heat exchange and jet air box units arranged up and down in sequence. The exchange pipe (high-temperature combustion exhaust gas pipe side, protective gas shell side) heats the nitrogen-hydrogen mixed gas in the wind box, and sprays high-temperature nitrogen-hydrogen mixed gas to both sides of the strip through high-speed nozzles facing both sides of the strip to rapidly heat it. Strip steel, the sprayed high-temperature nitrogen-hydrogen mixed gas performs heat exchange with the low-temperature strip steel. After the mixed gas reduces the temperature, it is pumped back from the circulating fans arranged near both sides of the strip steel to the heat exchanger in the furnace and its internal tube path. The combustion exhaust gas undergoes heat exchange again to increase the temperature of the nitrogen-hydrogen mixed gas again, and then is sprayed from the inside of the jet air box unit to both sides of the strip, and so on.

In the preheating device:

The preheating is provided with a heat exchange and jet air box unit and a direct-fired combustion exhaust gas secondary combustion chamber. The heat exchange and air-jet airbox unit uses heat exchange pipes (the heat exchanger is not arranged outside the furnace) to convert the direct-fired combustion exhaust gas into a secondary combustion chamber. The combustion exhaust gas re-burned in the secondary combustion chamber heats the nitrogen and hydrogen protective gas recycled in the air box. Under the action of the circulating fan, the heated nitrogen and hydrogen protective gas is sprayed at high speed to the upper and lower surfaces of the strip to force convection heat exchange to achieve rapid and efficient preheating. steel.

An open flame burner is also provided in the direct-fired combustion exhaust gas secondary combustion chamber, which is used for the oxygen-rich secondary combustion of the gas that is not fully burned in the direct-fired combustion exhaust gas in the direct-fired combustion exhaust gas secondary combustion chamber, and the burning flame will not contact to strip steel.

An exhaust gas secondary mixing chamber connected to the heat exchange tube is provided between the upper and lower air box bodies. The temperature of the exhaust gas is uniformized in the exhaust gas secondary mixing chamber before entering the downward air box body.

The sealing device is a nitrogen sealing structure and is provided with a nitrogen sealing chamber. Each nitrogen sealing chamber is equipped with a nitrogen injection pipe port. By introducing sealing nitrogen into the nitrogen sealing chamber, a relatively high pressure is maintained and a large amount of direct fire combustion waste gas is prevented from entering the furnace. The heat and jet air box unit has a through-belt channel inside, which can avoid excessive oxidation of the surface of the strip steel by direct fire combustion exhaust gas.

A sealing device is provided at the strip entrance of the preheating furnace, and a gas injection port is also provided inside to inject a small amount of sealing nitrogen or air. Its function is to prevent direct fire combustion waste gas from overflowing outside the furnace.

Jet radiant tube preheating device

The spray radiant tube preheating device used in each production line of the present invention includes:

Radiant tube heating furnace has a furnace top roller chamber above the furnace body, and a steering roller is installed in the furnace top roller chamber;

A radiant tube exhaust gas collection chamber is connected to the radiant tube heating furnace body through a connecting pipe;

Preheating furnace, including:

The upper side wall of the preheating furnace body is provided with a connecting hole, which is connected to the radiant tube exhaust gas collection chamber through a connecting tube; the top of the preheating furnace body is provided with a corresponding and supplying roller chamber corresponding to the top roller chamber of the radiant tube heating furnace. The furnace throat that the strip passes through; the bottom of the furnace body of the preheating furnace is equipped with a steel inlet, an entrance sealing device and an entrance steering roller; the upper part of the preheating furnace body is equipped with a preheating furnace gas collecting chamber; the lower part of the furnace body is equipped with a strip hole. The lower partition forms an exhaust gas collection chamber and is connected to an exhaust gas fan through an exhaust gas discharge pipe. Preferably, a control valve is provided on the exhaust gas discharge pipe;

A number of heat exchange and jet air box units are arranged on both sides of the preheating furnace body below the preheating furnace gas chamber along the height direction of the furnace body, with a belt passage for the strip steel to pass through; each heat exchanger and The jet air box unit includes,

The air box body has a number of heat exchange tubes vertically arranged inside it, and a number of nozzles are arranged on one side of the air box body relative to the belt passage; an exhaust gas secondary mixing chamber connected to the heat exchange tubes is arranged between the upper and lower air box bodies. ; Pass protective gas into the wind box body, preferably, nitrogen and hydrogen protective gas is passed into the wind box body;

Sealing devices for strip steel to pass through are respectively provided at the lower port of the strip passage and the strip holes of the upper and lower partitions. at.

Preferably, the inlet sealing device and the sealing device for the steel strip to pass through are nitrogen sealing structures, using a nitrogen sealing chamber with a nitrogen injection pipe installed on it.

The spray radiant tube preheating device of the present invention directly uses heat exchange in the furnace (the heat exchange is not arranged outside the furnace) to heat the recycled nitrogen and hydrogen protective gas, and uses the heated nitrogen and hydrogen protective gas to be sprayed onto the upper and lower surfaces of the strip at high speed to force convection. Heat exchange realizes fast and efficient preheating of steel. Compared with traditional heat exchange outside the furnace, this method has less heat loss in the furnace body, more waste heat from the combustion exhaust gas, higher heating efficiency, and faster heating rate; moreover, the radiant tube combustion exhaust gas The exhaust gas from the radiant tube gas collecting chamber enters the preheating furnace gas collecting chamber through the connecting pipe, and then passes from the heat exchanger chamber in the preheating furnace (the heat exchanger is not set outside the furnace) from top to bottom, and the pipes are routed during the process. The combustion exhaust gas in the shell removal process and the nitrogen and hydrogen protective gas in the shell removal process are fully heat exchanged in the heat exchanger to heat the nitrogen and hydrogen protective gas. Therefore, the radiant tube combustion exhaust gas in the preheating furnace is never in direct contact with the strip steel, thereby avoiding The oxidation of the strip surface is eliminated; in addition, using the preheating device, the strip preheating temperature is high, which can reach at least 250°C and above, which is at least 50°C higher than the ordinary preheating zone steel temperature; if the spray preheating unit is arranged The quantity is sufficient, and the temperature of the radiant tube combustion exhaust gas coming out of the multi-stage preheating furnace can usually be lower than 200°C, and can be directly discharged. There is no need for additional investment to reuse the waste heat of the combustion exhaust gas outside the furnace.

Jet radiation composite heating device

The jet radiation composite heating device used in each production line of the present invention includes:

The furnace body has a composite heating body arranged along the height direction; the composite heating body includes,

The thermal insulation box has thermal insulation material on the inner wall of the shell; a mounting hole is provided in the center of one side of the thermal insulation box;

A circulation fan is installed at the installation hole of the insulation box, its air suction port corresponds to the axis of the installation hole, and the air outlet is located on the side of the casing;

The buffer cavity is arranged in the insulation box corresponding to the air suction port of the circulating fan. The back of the buffer cavity is provided with a hot air outlet corresponding to the air suction port of the circulating fan. The front of the buffer cavity is provided with a hot air inlet. Preferably, the buffer cavity is connected to the air suction port of the circulating fan. The jet air box is an integrated structure;

Two air jet air boxes are arranged vertically and symmetrically on both sides of the hot air inlet on the front of the buffer cavity in the insulation box, forming a belt passage for the strip steel to pass through; one side edge of the two air jet air boxes located on both sides of the belt passage Several rows of jet nozzles are arranged at intervals in the height direction, and a gap is set between n rows of jet nozzles, n≥1; preferably, the diameter of the jet nozzle is 1/10 to 1/5 of the distance from the jet nozzle to the strip; More preferably, the jet nozzle adopts a round hole structure;

A number of radiant tubes are symmetrically arranged in the two air jet air boxes. The radiant tubes include a connecting pipe section connected to the nozzles, a radiating tube section bent and extended from one end of the connecting pipe section, and a heat exchange tube section formed by extending and bending from one end of the radiating tube section; The radiant tube sections correspond to the gaps between n rows of jet nozzles in the air jet air box, forming an alternating structure of air jet and radiation; preferably, the radiant tube sections, connecting tube sections, and heat exchange tube sections of the radiant tube are arranged in parallel.

Preferably, the air jet sealing box is a high temperature air jet air box. Preferably, the temperature of the high-temperature gas in the high-temperature jet air box is above 750°C, such as 750-880°C. Preferably, the nozzle is a jet high-speed nozzle. Preferably, the speed of the jet gas at the nozzle outlet is not less than 50m/s.

The jet radiation composite heating device of the present invention adopts composite heating technology, which can organically combine high-speed and high-temperature jet heating technology with radiant tube heating technology, giving full play to the technical advantages of high-speed and high-temperature jet heating technology and radiant tube heating technology. . By optimizing the design of the structure of the radiant tube, the radiant tube is installed inside the high-speed jet air box, and the heat generated by the combustion gas of the radiant tube is quickly transferred to the strip through two methods: high-speed, high-temperature jet and radiation, achieving rapid heating of the strip. The average heating speed of 1mm strip steel is no less than 40℃/s, which can greatly shorten the length of the heating furnace. For a unit with an annual output of 300,000 tons, the heating section has about 2 passes, reducing the thermal inertia of the furnace body;

Secondly, since the heat generated by the gas is taken away by the circulating gas (N ₂ + H ₂ ) in the wind box, this can not only reduce the exhaust temperature of the radiant tube, but also reduce the exhaust temperature of the radiant tube by about 100°C under the same circumstances, improving the The thermal efficiency of radiant tubes is about 5%, which can also reduce the average operating temperature of radiant tubes and extend the service life of radiant tubes;

Thirdly, the temperature of the heated circulating gas is relatively uniform, so the temperature distribution in the width direction of the strip during the heating process is relatively uniform. According to the actual operation, the uniformity in the width direction of the strip during the heating process is controlled at ±5°C, thereby achieving the unit's Stable operation. High-speed jet and radiation composite heating technology will significantly increase the production capacity of existing units and solve the problem of insufficient heating capacity on the production line.

The radiant tube of the jet radiation composite heat equalizing device of the present invention not only has a combustion radiation function (referring to the high-temperature section of the radiant tube between the two rows of nozzles), but also has a heat exchanger function to heat the circulating gas, so that The heat of the combustion gas in the radiant tube is quickly transferred to the strip through forced heat exchange to achieve rapid heating of the strip, which can greatly shorten the length of the heating furnace and reduce the thermal inertia of the large vertical continuous annealing furnace body.

Description of drawings

Figure 1 shows the station layout of a traditional hot-dip galvanizing (GI) production line;

Figure 2 shows the station layout of the traditional alloyed hot-dip galvanizing (GA) production line;

Figures 3 to 10 are production line station layouts of Examples 1 to 8 of the rapid hot-dip galvanizing strip production line of the present invention;

Figure 11 is a schematic structural diagram of an embodiment of the injection direct fire preheating device according to the present invention;

Figure 12 is a schematic structural diagram of the preheating furnace in the embodiment of the injection direct fire preheating device according to the present invention;

Figure 13 is a schematic structural diagram 1 of an embodiment of the jet radiation composite heating/uniform heat device according to the present invention;

Figure 14 is a schematic structural diagram 2 of an embodiment of the jet radiation composite heating/uniform heat device according to the present invention;

Figure 15 is a schematic structural diagram of the composite heating body in the embodiment of the jet radiation composite heating/uniform heat device according to the present invention;

Figure 16 is a partial perspective view of the jet air box in the embodiment of the jet radiation composite heating/uniform heat device according to the present invention;

Figure 17 is a perspective view of the radiant tube in the embodiment of the jet radiation composite heating/uniform heat device according to the present invention.

Figures 18 to 25 are production line station layout diagrams of embodiments 1 to 8 of the rapid hot-dip galvanizing high-strength steel strip production line of the present invention;

Figure 26 is a schematic structural diagram of an embodiment of the jet radiant tube preheating device according to the present invention;

Figure 27 is a schematic structural diagram of the preheating furnace in the embodiment of the jet radiant tube preheating device according to the present invention;

Figures 28 to 41 are production line station layouts of Examples 1 to 14 of the rapid hot-dip galvanizing ultra-high strength strip steel according to the present invention;

Figure 42 is a schematic diagram of the station layout of a traditional continuous withdrawal production line;

Figures 43 to 71 are schematic diagrams showing the layout of production line stations in Embodiments 1 to 29 of the rapid continuous strip steel withdrawal production line of the present invention;

Figures 72 to 78 are schematic diagrams of the production line station layout of Embodiments 1 to 7 of the invention for rapid continuous withdrawal of high-strength steel strips;

Figures 79 to 85 are production line station layout diagrams of embodiments 1 to 7 of the rapid continuous annealing ultra-high-strength strip steel production line of the present invention;

Figures 86 to 93 are schematic diagrams of the layout of production line stations in Examples 1 to 8 of the rapid continuous withdrawal of ultra-high strength strip steel production lines according to the present invention;

Figures 94 to 111 are production line station layout diagrams of embodiments 1 to 18 of the ultra-short flow dual-purpose strip production line of the present invention;

Figures 112 to 139 are production line station layout diagrams of embodiments 1 to 28 of the ultra-short process and ultra-high strength strip steel production line of the present invention;

Figures 140 to 147 are production line station layout diagrams of Examples 1 to 8 of the ultra-short process hot-dip galvanizing high-strength strip steel production line of the present invention;

Figures 148 to 153 are production line station layouts of Examples 1 to 6 of the flexible cold-rolled strip steel post-processing production line suitable for producing various high-strength steels according to the present invention;

Figures 154 to 159 are production line station layouts of Examples 1 to 6 of the flexible cold rolling post-processing production line suitable for producing various ultra-high-strength strip steels according to the present invention;

Figures 160 to 166 are production line station layouts of Examples 1 to 7 of the flexible cold-rolled strip steel post-processing line suitable for producing various high-strength steels according to the present invention;

Figures 167 to 174 are production line station layouts of Examples 1 to 8 of the flexible production line suitable for various ultra-high strength strip steels according to the present invention;

Figures 175 to 186 are production line station layout diagrams of Examples 1 to 12 of the ultra-high strength strip production line for continuous withdrawal or hot-dip galvanizing according to the present invention;

Figures 187 to 198 are production line work station layout diagrams of Examples 1 to 12 of the continuous retreat or hot-dip galvanizing dual-purpose high-strength strip steel production line of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the embodiments and drawings: It should be noted that a variety of production lines can be derived and expanded by applying the ideas of the present invention. This embodiment only provides some implementation modes, and the family patent of the present invention will also provide Other implementations, even the entire group of patented embodiments, only provide partial implementations. Various combinations resulting from the selection or non-selection of workstations or sections described in the present invention are all within the scope of the present invention. , various production lines derived according to the idea of the present invention are also within the protection scope of the present invention. In addition, for conventional stations, for example, the cleaning station includes an alkali spray section, an alkali brushing section, an electrolytic cleaning section, a hot water brushing or a cold water abrasive roller brushing section and a hot water rinsing section, or even a simple The combined use of high-pressure water jet brushing section, ultrasonic cleaning section, high-pressure cleaning section and other new cleaning equipment are considered to be the derived production lines of the present invention, and are also within the scope of protection of the present invention. For another example, the finishing station includes equipment such as trimming and oiling, which is also within the scope of the present invention.

Rapid hot-dip galvanized strip production line

Referring to Figure 3, the rapid hot-dip galvanizing strip production line of the present invention includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - outlet looper - smoothing - coiling; wherein,

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, and a balanced heat preservation section. , secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

Refer to Figure 4, which shows Embodiment 2 of the present invention. In Embodiment 2, the rapid hot-dip galvanizing strip production line includes the following in order: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - Export looper - flattening - coiling; among them,

The central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and a secondary reheating section. , furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

The jet radiation composite heating section not only uses radiant tubes to radiate and heat the strip, but also uses the radiant tube combustion exhaust gas to heat recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

Refer to Figure 5, which shows Embodiment 3 of the present invention. In Embodiment 3, the rapid hot-dip galvanizing strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post Processing-export looper-flattening-coiling; among which,

The central continuous post-processing station includes a jet direct fire preheating section, a direct fire heating section, a radiant tube heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, and a balanced heat preservation section. section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

The characteristic of the injection direct fire injection preheating section is that the direct fire heating section is used to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

The reheating section and the secondary reheating section use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Refer to Figure 6, which shows Embodiment 4 of the present invention. In Embodiment 4, the rapid hot-dip galvanizing strip production line, It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - outlet looper - leveling - coiling; among them,

The central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and a secondary reheating section. section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

The jet radiation composite heating section and the soaking section use radiant tubes to radiate the strip steel, and also use the radiant tubes to burn exhaust gas to heat recycled nitrogen and hydrogen protective gases, and then the nitrogen and hydrogen protective gases are sprayed onto the upper and lower surfaces of the strip steel to achieve forced convection. Heat exchange.

Refer to Figure 7, which shows Embodiment 5 of the present invention. In Embodiment 5, the following work stations are included: Uncoiling-Welding-Inlet Loop-Cleaning-Central Continuous Post-processing-Exit Loop-Smoothing-Coiling take; among them,

Referring to Figure 8, the rapid alloying hot-dip galvanized strip production line includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-exit looper-flattening-coiling; wherein,

Referring to Figure 9, the rapid alloying hot-dip galvanized strip production line includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-exit looper-flattening-coiling; wherein,

The central continuous post-processing station includes a jet direct fire preheating section, a direct fire heating section, a radiant tube heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, and a balanced heat preservation section. section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final water cooling section.

The direct-fire injection preheating section uses the direct-fire heating section to burn exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

Refer to Figure 10, which shows Embodiment 6 of the present invention. In Embodiment 6, the rapid alloying hot-dip galvanized strip production line includes the following stations in order: Uncoiling-Welding-Inlet Loop-Cleaning-Central Continuous post-processing-export looper-flattening-coiling; among which,

The central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and a secondary reheating section. section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final water cooling section.

Preferably, an optional movable post-plating quick cooling section is provided behind the air knife section of the central continuous post-processing station and before the post-plating cooling section. The strip steel is hot-dip galvanized from the zinc pot section through the air knife section to control the coating weight. In the future, you can choose to use the movable post-plating rapid cooling section for post-plating rapid cooling, or you can choose not to use the movable post-plating rapid cooling section for natural cooling and then post-plating cooling to achieve continuous production of hot-dip galvanized strips.

Referring to Figures 11 and 12, the injection direct fire preheating device of the present invention includes: a direct fire furnace 1 and a preheating furnace 2; wherein,

The direct-fired stove 1 includes:

The upper and lower ends of the furnace shell 11 are respectively provided with a furnace top roller chamber 101 and a furnace bottom roller chamber 102; the furnace top roller chamber 101 and the furnace bottom roller chamber 102 are respectively provided with steering rollers 12 and 12'; the furnace shell 11 is provided along the height direction. Several direct fire heating areas 111 are provided with several direct fire burners; the upper side wall of the furnace shell 11 is provided with two through holes, and are arranged symmetrically left and right;

The preheating furnace 2 includes:

The upper side wall of the furnace body 21 is provided with two connection holes, which are symmetrically arranged left and right, and are respectively connected to the through holes in the upper part of the furnace shell 11 of the direct furnace 1 through communication pipes 22; the top of the furnace body 21 is provided with the direct furnace 1 The top roller chamber 101 corresponds to the furnace throat 211 for strip steel to pass through; the bottom of the furnace body 21 is provided with a strip entrance and a corresponding sealing device 212 and a steering roller 23; the upper part of the furnace body 21 is provided with an upper partition with a hole for wearing the strip. 213, forming a direct-fired exhaust gas upper gas collection chamber 201; a direct-fired combustion exhaust gas secondary combustion chamber 202 is provided below the direct-fired exhaust gas upper gas collecting chamber 201, and the direct-fired combustion exhaust gas secondary combustion chamber 202 is equipped with at least one open flame burner 24 ; The lower part of the furnace body 21 is provided with a lower partition 214 with holes to form a direct-fired exhaust gas lower gas collecting chamber 203, and is connected to an exhaust gas fan 25 through an exhaust gas discharge pipe 215;

A number of heat exchange and jet air box units 26 are arranged along the height direction of the furnace body 21 on both sides below the direct-fired combustion exhaust gas secondary combustion chamber 202 in the furnace body 21, with a belt passage 204 formed in the middle for the strip steel to pass through; Each heat exchange and jet air box unit 26 includes,

The wind box body 261 has a number of heat exchange tubes 262 vertically arranged in it. The wind box body 261 is provided with a number of nozzles 263 on one side of the belt passage 204; the heat exchange tubes 262 are arranged between the upper and lower wind box bodies 261. The connected exhaust gas secondary mixing chamber 205; nitrogen and hydrogen protective gas is introduced into the wind box body 261;

The circulation fan 264 has an inlet pipe port located in the belt passage 204 and an outlet pipe port located in the wind box body 261;

A plurality of sealing devices 27, 27’, and 27″ for the steel strip to pass through are respectively provided at the upper and lower ports of the strip passage 204 and at the strip holes of the upper and lower partitions 213 and 214.

Preferably, a combustion exhaust gas thermometer 28 is also provided in the direct-fired combustion exhaust gas secondary combustion chamber 202.

Preferably, the sealing devices 27, 27', and 27" are nitrogen-sealed structures, using nitrogen-sealed chambers with nitrogen injection pipes on them.

Preferably, the exhaust gas discharge pipe 215 is provided with a control valve 216.

The strip 100 runs upward through the steering roller in front of the direct-fired furnace. It is first sealed by the preheating furnace entrance sealing device and then enters the preheating furnace 2 for preheating. Then it enters the top roller chamber of the direct-fired furnace 1. After being turned by the steering roller, it enters the direct-fired furnace. Furnace 1 performs direct fire heating, and then enters the furnace bottom roller chamber of direct fire furnace 1, and continues to operate after being turned by the steering roller.

The direct-fired combustion exhaust gas heats the nitrogen and hydrogen protective gas through the heat exchange pipe and then the temperature of the exhaust gas drops (the nitrogen and hydrogen protective gas is blown to the upper and lower surfaces of the strip steel to preheat the strip steel under the action of the circulating fan). The cooled nitrogen and hydrogen protective gas is The working side (WS side) and driving side (DS side) of the preheating furnace are sucked into the air box by the circulating fan 264 for heat exchange with the heat exchange pipe; the direct-fired combustion exhaust gas passes through the heat exchanger and the heat exchanger from top to bottom. The jet air box unit, under the suction of the variable frequency exhaust gas fan 25, passes through the exhaust gas discharge pipe 215 first through the waste heat boiler 400 for secondary utilization of the waste heat of the combustion exhaust gas outside the furnace, and then enters the chimney 500 for final discharge.

Referring to Figures 13 to 17, the jet radiation composite heating/uniform heat device according to the present invention includes:

The furnace body 4 has a composite heating body 5 arranged along the height direction; the composite heating body 5 includes,

The thermal insulation box 51 is provided with thermal insulation material on the inner wall of the casing; a mounting hole is provided in the center of one side of the thermal insulation box 51;

The circulation fan 52 is provided at the installation hole of the insulation box 51, its air suction port 521 corresponds to the axis of the installation hole, and the air outlet 522 is provided on the side of the casing;

The buffer cavity 53 is provided in the insulation box 51 corresponding to the air suction port of the circulation fan 52. The back side of the buffer cavity 53 is provided with a hot air outlet 531 corresponding to the air suction port of the circulation fan 52, and the front side of the buffer cavity is provided with a hot air inlet 532;

Two jet air boxes 54, 54' are vertically symmetrically arranged on both sides of the hot air inlet on the front of the buffer cavity 53 in the insulation box 51, forming a belt passage 200 for the steel strip 100 to pass through; located in the belt passage 100 Several rows of jet nozzles 55, 55' are arranged on one side of the two jet air boxes 54 and 54' on both sides at intervals along the height direction, and a gap 300 is set between n rows of jet nozzles, n≥1;

A number of radiant tubes 56, 56' are symmetrically arranged in the two jet air boxes 54, 54'. Taking the tube 56 as an example, the same below) includes a connecting tube section 561 connected to the nozzle, a radiating tube section 562 bent and extended from one end of the connecting tube section 561, and a heat exchange tube section 563 formed by extending and bent from one end of the radiating tube section 562; the radiating tube section 562 corresponds to The gaps 300 provided between n rows of jet nozzles in the jet air box 54 form an alternating structure of jet and radiation.

Preferably, the buffer cavity and the jet air box are of an integrated structure.

Preferably, the diameter of the jet nozzle is 1/10 to 1/5 of the distance from the jet nozzle to the strip.

Preferably, the jet nozzle adopts a circular hole structure.

Preferably, the radiant tube adopts a spatial four-stroke structure to form four parallel tube sections, one of which is a radiant tube section, and the rest are connecting tube sections and heat exchange tube sections.

Example 1

Preparation of a hot-dip galvanized strip. The production line layout is shown in Figure 3. The strip whose main chemical composition (mass%) of the substrate is 0.1% C-0.50% Si-1.95% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use spray direct fire to preheat to 360℃, then direct fire to 680℃, then heat the radiant tube to 800℃, soak the radiant tube at 800℃ for 50 seconds, slowly cool to 670℃, and high hydrogen cooling to 470°C, through the reheating section (the reheating function does not need to be input), the equalization insulation section and the secondary reheating section (the secondary reheating function does not need to be input), and is immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating, the knife performs post-coating cooling, and then finally water-cools to room temperature. After being flattened, it enters the outlet looper, and then is coiled to complete production. The yield strength of the final product strip steel is 365MPa, the tensile strength is 685MPa, and the elongation at break is 26%.

Example 2

Preparation of a hot-dip galvanized strip. The production line layout is shown in Figure 4. The strip whose main chemical composition (mass%) of the substrate is 0.18% C-1.7% Si-2.3% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use jet radiation composite heating to 670℃, then heat the radiant tube to 850℃, soak the radiant tube at 850℃ for 80 seconds, slowly cool to 675℃, cool to 230℃ with high hydrogen, and then heat to 400℃ , balanced heat preservation at 400℃, then reheated to 455℃ for a second time, then immersed in a zinc pot for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it is cooled after plating, and then finally water-cooled to room temperature. After being flattened, it enters the outlet looper, and then rolled Take it and complete the production. The yield strength of the final product strip is 726MPa, the tensile strength is 1058MPa, and the elongation at break is 19%.

Example 3

Preparation of a hot-dip galvanized strip. The production line layout is shown in Figure 5. The strip whose main chemical composition (mass%) of the substrate is 0.11% C-0.46% Si-2.0% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use direct fire to preheat to 355℃, and then heat to 675℃, then heat the radiant tube to 795℃, use jet radiation composite soaking at 795℃ for 60 seconds, slowly cool to 675℃, high hydrogen Cool to 475°C, pass through the reheating section (reheating function does not need to be input), and maintain equilibrium The warm section and the secondary reheating section (the secondary reheating function does not need to be invested) are immersed in the zinc pot through the furnace nose for hot-dip galvanizing. The weight of the coating is controlled by an air knife and then cooled after plating, and then finally water-cooled to room temperature. After smoothing It enters the outlet looper and then is rolled up to complete production. The yield strength of the final product strip steel is 398MPa, the tensile strength is 696MPa, and the elongation at break is 28%.

Example 4

Preparation of a hot-dip galvanized strip. The production line layout is shown in Figure 6. The strip whose main chemical composition (mass%) of the substrate is 0.17% C-1.75% Si-2.2% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use jet radiation composite heating to 705℃, then heat the radiant tube to 855℃, soak the jet radiation composite at 855℃ for 80 seconds, slowly cool to 670℃, cool to 230℃ with high hydrogen, and then heat to 395℃ ℃, balanced insulation at 395℃, then reheated to 457℃ twice, then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. The weight of the coating is controlled by an air knife and then cooled after plating. Then, it is finally water-cooled to room temperature, and then enters the outlet after being flattened. The looper is then rolled up to complete production. The yield strength of the final product strip is 715MPa, the tensile strength is 1036MPa, and the elongation at break is 21%.

Example 5

Preparation of a hot-dip galvanized strip. The production line layout is shown in Figure 7. The strip whose main chemical composition (mass%) of the substrate is 0.08% C-0.18% Si-1.96% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use spray direct fire to preheat to 350℃, then direct fire to 670℃, then heat the radiant tube to 810℃, soak the radiant tube at 810℃ for 60 seconds, slowly cool to 670℃, and high hydrogen cooling to 465°C, through the reheating section (reheating function does not need to be input), balanced insulation section and secondary reheating section (secondary reheating function does not need to be input), and is immersed in the zinc pot through the furnace nose for hot-dip galvanizing. The knife controls the weight of the coating and then alloys and heats it to 500°C. The alloying is soaked at 500°C for 18 seconds, then cooled after plating, and then finally water-cooled to room temperature. After being flattened, it enters the outlet looper, and then is coiled to complete production. The yield strength of the final product strip is 550MPa, the tensile strength is 837MPa, and the elongation at break is 19%.

Example 6

Preparation of a hot-dip galvanized strip. The production line layout is shown in Figure 10. The strip whose main chemical composition (mass%) of the substrate is 0.165% C-1.8% Si-2.25% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use jet radiation composite heating to 670℃, re-radiant tube heating to 855℃, jet radiation composite soaking at 855℃ for 90 seconds, slow cooling to 670℃, high hydrogen cooling to 220℃, and then heating to 410℃, balanced insulation at 410℃, then reheated to 460℃, then immersed in the zinc pot through the furnace nose for hot-dip galvanizing, controlled by an air knife to control the coating weight, alloyed and heated to 515℃, alloyed and homogenized at 510℃ Heat for 22 seconds, then perform post-plating cooling, and then finally water-cool to room temperature. After being flattened, it enters the outlet looper, and then is coiled to complete production. The yield strength of the final product strip steel is 732MPa, the tensile strength is 1028MPa, and the elongation at break is 18%.

Rapid hot-dip galvanizing high-strength strip production line

Refer to Figure 18, which shows Embodiment 1 of the present invention. In Embodiment 1, the rapid hot-dip pure zinc high-strength strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper- Central continuous post-processing - smoothing - outlet looper - coiling; wherein, the central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, and a slow Cold section, high hydrogen cooling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

In addition to using radiant tubes to radiate and heat the strip, the jet radiation composite heating section also uses the radiant tube combustion exhaust gas to heat recycled nitrogen-hydrogen protective gas or full hydrogen gas, and then the nitrogen-hydrogen protective gas or full hydrogen gas is injected into the strip. The upper and lower surfaces realize forced convection heat exchange; the transverse magnetic induction heating section is used to further rapidly increase the temperature of the high-temperature strip; the reheating section and the secondary reheating section both use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Refer to Figure 19, which shows Embodiment 2 of the present invention. In Embodiment 2, the rapid hot-dip pure zinc high-strength strip production line includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous back Processing - smoothing - outlet looper - coiling; wherein, the central continuous post-processing station includes a spray radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, and a slow cooling section. , high hydrogen cooling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

The injection radiant tube preheating section uses the radiant tube heating section and the radiant tube soaking section to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. ;

The transverse magnetic induction heating section is used to further rapidly increase the temperature of high-temperature strip steel;

Referring to Figure 20, Embodiment 3 of the present invention, the rapid hot-dip pure zinc strip production line includes the following stations in order: uncoiling - welding - entrance looper - central continuous post-processing - leveling - exit looper - coiling; Among them, the central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, and a balancing section. Insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section.

The jet radiation composite heating device not only uses radiant tubes to radiate and heat the strip, but also uses the radiant tube combustion exhaust gas to heat recycled nitrogen-hydrogen protective gas or full hydrogen gas, and then the nitrogen-hydrogen protective gas or full hydrogen gas is injected into the strip. The upper and lower surfaces realize forced convection heat exchange; the transverse magnetic induction heating section is used to further rapidly increase the temperature of the high-temperature strip; the reheating section and the secondary reheating section both use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Referring to Figure 21, Embodiment 4 of the present invention, the rapid hot-dip pure zinc high-strength strip production line includes the following stations in order: uncoiling - welding - entrance looper - central continuous post-processing - leveling - outlet looper - coiling ; Among them, the central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, and a reheating section. , balanced insulation section, secondary reheating section, furnace nose section, Zinc pot section, air knife section, post-plating cooling section and final water cooling section.

The injection radiant tube preheating device uses the combustion exhaust gas in the radiant tube heating section and the radiant tube soaking section to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. ;

The transverse magnetic induction heating section is used to further rapidly increase the temperature of the high-temperature strip; the reheating section and the secondary reheating section both use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Refer to Figure 22, which shows Embodiment 5 of the present invention. In Embodiment 5, the hot-dip galvanizing is alloyed hot-dip galvanizing; the rapid alloying hot-dip galvanizing strip production line includes the following stations in sequence: uncoiling - Welding - Inlet looper - Central continuous post-processing - Leveling - Exit looper - Coiling; wherein, the central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, Radiant tube soaking section, slow cooling section, high hydrogen cooling section, reheating section, balanced heat preservation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section section, post-plating cooling section and final water cooling section.

The jet radiation composite heating device not only uses radiant tubes to radiate and heat the strip, but also uses the radiant tube combustion exhaust gas to heat recycled nitrogen-hydrogen protective gas or full hydrogen gas, and then the nitrogen-hydrogen protective gas or full hydrogen gas is sprayed onto the top and bottom of the strip. The surface realizes forced convection heat exchange; the transverse magnetic induction heating section is used to further rapidly increase the temperature of the high-temperature strip; the reheating section and the secondary reheating section both use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Refer to Figure 23, which shows Embodiment 6 of the present invention. In Embodiment 6, the hot-dip galvanizing is alloyed hot-dip galvanizing; the rapid alloying hot-dip galvanizing strip production line includes the following stations in sequence: uncoiling - Welding - Inlet looper - Central continuous post-processing - Leveling - Exit looper - Coiling; wherein, the central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, and a transverse magnetic induction heating section. , radiant tube soaking section, slow cooling section, high hydrogen cooling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying homogenization section Hot section, post-plating cooling section and final water cooling section.

The injection radiant tube preheating section uses the radiant tube heating section and the radiant tube soaking section to burn exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; The transverse magnetic induction heating section is used to further rapidly increase the temperature of the high-temperature strip; the reheating section and the secondary reheating section both use longitudinal magnetic induction heating equipment to rapidly heat the strip.

Referring to Figure 24, Embodiment 7 of the present invention, hot-dip galvanizing is alloyed hot-dip galvanizing; the rapid alloyed hot-dip galvanizing strip production line includes the following work stations in sequence: uncoiling - welding - entrance looper - central continuous Post-processing - flattening - outlet looper - coiling; wherein, the central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a jet radiation composite soaking section, and a slow cooling section. section, high hydrogen cooling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final Water cooling section.

The jet radiation composite heating section not only uses radiant tubes to radiate the strip steel, but also uses radiant tube combustion exhaust gas to heat the cycle. The nitrogen-hydrogen protective gas or full hydrogen gas is recycled, and then the nitrogen-hydrogen protective gas or full hydrogen gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange.

Referring to Figure 25, Embodiment 8 of the present invention, hot-dip galvanizing is alloyed hot-dip galvanizing; the rapid alloyed hot-dip galvanizing strip production line includes the following workstations in sequence: uncoiling - welding - entrance looper - central continuous Post-processing - smoothing - outlet looper - coiling; wherein, the central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a jet radiant composite soaking section, and a slow Cold section, high hydrogen cooling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and Final water cooling section.

The injection radiant tube preheating section uses the radiant tube heating section and the radiant tube soaking section to burn exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

Preferably, optional mobile post-plating rapid cooling section equipment is installed after the air knife section and before the post-plating cooling section; after the strip is hot-dip galvanized from the zinc pot section and passes through the air knife section to control the coating weight, you can choose to use the mobile post-plating rapid cooling section. The cold section is used for rapid cooling after plating, or it is not necessary to use the mobile post-plating rapid cooling section for natural cooling and then post-plating cooling to achieve continuous production of hot-dip galvanized strips.

Referring to Figures 26 and 27, the jet radiant tube preheating device according to the present invention includes:

Radiant tube heating furnace 1 has a furnace top roller chamber 101 located above the furnace body, and a steering roller 102 is provided in the furnace top roller chamber 101;

The radiant tube exhaust gas collection chamber 2 is connected to the furnace body of the radiant tube heating furnace 1 through the connecting pipe 21;

Preheating furnace 3, including:

The preheating furnace body 31 has a connecting hole on its upper side wall, and is connected to the radiant tube exhaust gas collecting chamber 2 through a connecting pipe 32; a furnace throat 311 corresponding to the furnace top roller chamber 101 of the radiant tube heating furnace 1 and for the strip to pass through is provided at the top of the preheating furnace body 31; a strip steel inlet and an inlet sealing device 33 and an inlet turning roller are provided at the bottom of the preheating furnace body 31; a preheating furnace collecting chamber 312 is provided at the upper part of the preheating furnace body 31; a lower baffle 313 with a through hole is provided at the lower part of the preheating furnace body 31 to form a lower exhaust gas collecting chamber 314, and is connected to an exhaust gas fan 35 through an exhaust gas exhaust pipe 34, and is discharged from the chimney 500;

A plurality of heat exchange and jet air box units 36 are arranged on both sides below the preheating furnace gas collecting chamber 312 in the preheating furnace body 31 along the height direction of the preheating furnace body 31, with a through hole for strip steel passing through the middle. With channel 315; each heat exchange and jet air box unit 36 includes,

The wind box body 361 has a number of heat exchange tubes 362 vertically arranged in it. The wind box body 362 is provided with a number of nozzles 363 on one side of the belt passage 315; the heat exchange tubes 362 are arranged between the upper and lower wind box bodies 361. The connected exhaust gas secondary mixing chamber 365; nitrogen and hydrogen protective gas is introduced into the wind box body 361;

The circulation fan 364 has an inlet pipe port located in the belt passage 315 and an outlet pipe port located in the wind box body 361;

The sealing device 37 for the strip to pass through is provided at the lower port of the strip passage 315 and the strip hole of the lower partition 313 .

Preferably, the inlet sealing device 33 and the sealing device 37 are nitrogen sealing structures, using a nitrogen sealing chamber with a nitrogen injection pipeline provided thereon.

Preferably, the exhaust gas discharge pipe 34 is provided with a control valve 38 .

The strip 100 runs upward after being turned by the inlet steering roller. After being sealed by the inlet sealing device, it enters the preheating furnace 3 for preheating treatment. Then it enters the furnace top roller chamber. After being turned by the steering roller, it enters the radiant tube heating furnace 1; radiant tube heating The combustion exhaust gas enters the radiant tube exhaust gas collecting chamber 2 and is connected to the preheating furnace gas collecting chamber 312 of the preheating furnace 1 through the connecting pipe 32. The preheating furnace gas collecting chamber 312 is a closed gas collecting chamber to ensure that the exhaust gas in it is connected with the strip steel. 100 non-contact; the radiant tube combustion exhaust gas accumulates in the air collection chamber of the preheating furnace, and the radiant tube combustion exhaust gas is first used to preheat the combustion air required for its own combustion.

Under the action of the exhaust fan, the high-temperature radiant tube combustion exhaust gas in the preheating furnace gas collecting chamber 312 continuously passes through the air-jet air box units connected in series one after another. The air-jet air box units are equipped with heat exchange tubes (tubes) as heat exchangers inside. The combustion exhaust gas of the radiant tube heats the nitrogen and hydrogen protective gas through the heat exchanger, and the heated nitrogen and hydrogen protective gas is blown to the upper and lower surfaces of the strip steel under the action of the circulating fan. Tropical steel.

The radiant tube combustion exhaust gas flows from top to bottom from the inside of the heat exchange tube. During the flow process, heat exchange is performed to heat the nitrogen and hydrogen protective gas injected in the cycle, and then enters the exhaust gas secondary mixing chamber 365 between the jet air box units for secondary mixing. , the exhaust gas temperature is homogenized, and then enters the downward furnace heat exchange and jet air box unit until it reaches the bottom nitrogen sealing device, and finally enters the exhaust gas collection chamber 314.

The nitrogen and hydrogen protective gas passes between the heat exchange tube bundles, is heated, and is continuously sprayed from the nozzle to the upper and lower surfaces of the strip to preheat the strip under the action of the circulating fan. The air suction port of the circulating fan is connected to the DS side and WS side of the jet air box unit by the pipeline in the furnace. Under the action of the circulating fan, the nitrogen-hydrogen mixed gas is sprayed onto the surface of the strip and is extracted from both sides, and then is blown out by the circulating fan. It is sprayed onto the upper and lower surfaces of the strip through the heat exchanger to achieve circular injection of nitrogen and hydrogen mixed gas to heat the strip.

Example 1

Produce a hot-dip galvanized high-strength strip. The production line layout is shown in Figure 3. The main chemical composition (mass%) of the substrate is 0.12% C-0.41% Si-1.90% Mn. The strip is uncoiled, welded, and the entrance looper passes through , after cleaning, use jet radiation composite heating to 500℃, then the radiant tube is heated to 700℃, then transverse magnetic induction heating to 810℃, soak the radiant tube at 810℃ for 40 seconds, slowly cool to 670℃, and cool to 670℃ with high hydrogen. 460℃, passing through the reheating section (the reheating function can be turned off), the equalization insulation section and the secondary reheating section (the secondary reheating function can be turned off), and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating, the knife performs post-plating cooling, and then is finally water-cooled to room temperature. After being flattened, it enters the outlet looper. It is then rolled up to complete production. The yield strength of the final product strip is 355MPa, the tensile strength is 665MPa, and the elongation at break is 25%.

Example 2

A hot-dip galvanized high-strength strip is produced. The production line layout is shown in Figure 4. The strip whose main chemical composition (mass%) of the substrate is 0.18% C-1.80% Si-2.2% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use the jet radiant tube to preheat to 350°C, then heat the radiant tube to 810°C, then heat it to 910°C by transverse magnetic induction, soak the radiant tube at 910°C for 60 seconds, slowly cool to 670°C, and cool with high hydrogen to 230℃, then heated to 400℃, balanced heat preservation at 400℃, then reheated to 458℃ for a second time and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. The weight of the coating was controlled by an air knife and then cooled after plating. The water is cooled to room temperature, and after being flattened, it enters the outlet looper, and then is rolled up to complete production. The yield strength of the final product strip steel is 705MPa, the tensile strength is 1019MPa, and the elongation at break is 22%.

Example 3

A hot-dip galvanized high-strength strip is produced. The production line layout is shown in Figure 7. The strip whose main chemical composition (mass%) of the substrate is 0.085% C-0.16% Si-1.90% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, use jet radiation composite heating to 550℃, then the radiant tube is heated to 750℃, then transverse magnetic induction heating to 820℃, soak the radiant tube at 820℃ for 60 seconds, slowly cool to 670℃, and cool to 670℃ with high hydrogen. 465℃, passing through the reheating section (the reheating function can be turned off), the equalization insulation section and the secondary reheating section (the secondary reheating function can be turned off), and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. The knife controls the weight of the coating and then alloys and heats it to 500°C. The alloying is soaked at 500°C for 18 seconds, then cooled after plating, and then finally water-cooled to room temperature. After being flattened, it enters the outlet looper, and then is coiled to complete production. The yield strength of the final product strip is 565MPa, the tensile strength is 826MPa, and the elongation at break is 18%.

Example 4

A hot-dip galvanized high-strength strip is produced. The production line layout is shown in Figure 8. The strip whose main chemical composition (mass%) of the substrate is 0.18% C-1.75% Si-2.65% Mn is uncoiled, welded, and the entrance looper passes through , after cleaning, preheat the radiant tube to 275°C by spraying it, heat the radiant tube to 750°C, and then heat it to 850°C by transverse magnetic induction. The radiant tube is soaked at 850°C for 60 seconds, slowly cooled to 670°C, and cooled to 670°C with high hydrogen. After reaching 260°C, reheat to 420°C, then maintain the temperature evenly at 420°C to realize the redistribution of carbon elements in the strip steel and stabilize the residual austenite structure in the strip steel, and then reheat to 460°C again, and then The furnace nose is immersed in the zinc pot for hot-dip galvanizing. After the weight of the coating is controlled by an air knife, it enters the alloying heating furnace and is heated to 510°C. It is kept at 500°C in the alloying soaking furnace for 18 seconds, and then cooled to 140°C by the post-plating cooling equipment. Then it is finally water-cooled to below 45°C, then leveled and then entered into the outlet looper, and then coiled to complete production. The yield strength of the final product strip steel is 1088MPa, the tensile strength is 1203MPa, and the elongation at break is 15%.

Rapid hot-dip galvanizing ultra-high strength strip production line

Refer to Figure 28, which shows Embodiment 1 of the present invention. In Embodiment 1, the rapid hot-dip pure zinc ultra-high strength strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance loop- Cleaning-central continuous post-processing-smoothing-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, and a reheating section. , balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section,

Refer to Figure 29, which shows Embodiment 2 of the present invention. In Embodiment 2, the rapid hot-dip pure zinc ultra-high-strength strip production line includes the following stations in order: Uncoiling-Welding-Inlet Loop-Cleaning-Central Continuous post-processing-smoothing-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, an aerosol cooling section, and a pickling section. , reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section;

The characteristic of the injection direct-fire preheating section is that the direct-fired heating section is used to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

Refer to Figure 30, which shows Embodiment 3 of the present invention. In Embodiment 3, the rapid hot-dip pure zinc ultra-high-strength strip production line includes the following stations in order: Uncoiling-Welding-Inlet Loop-Cleaning-Central Continuous post-processing-smoothing-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a water quenching cooling section, and a pickling section. , reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section;

Refer to Figure 31, which shows Embodiment 4 of the present invention. In Embodiment 4, the rapid hot-dip pure zinc ultra-high strength strip production line includes the following stations: Uncoiling-Welding-Inlet Looper-Cleaning-Central Continuous Post-processing-smoothing-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, an aerosol cooling section, and a water quenching cooling section. section, pickling section, reheating section, equalization insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section;

32 to 34 , preferably, embodiments 5 to 7 of the present invention are based on embodiments 2 to 4, and a flash iron plating or flash nickel plating section is added after the pickling section, and the strip is flash plated before subsequent treatment.

Preferably, an optional mobile post-plating quick cooling section is set up after the air knife section equipment and before the post-plating cooling section. After the strip is hot-dip galvanized from the zinc pot section and the coating weight is controlled by the air knife section equipment, you can choose to use the mobile post-plating quick cooling section. The cold section is used for rapid cooling after plating, or it is not necessary to use the mobile post-plating rapid cooling section for natural cooling and then post-plating cooling to achieve continuous production of hot-dip galvanized strips.

Refer to Figure 35, which shows Embodiment 8 of the present invention. In Embodiment 8, the rapid hot-dip galvanizing ultra-high-strength strip production line includes the following stations in sequence: Uncoiling-Welding-Inlet Looper-Cleaning-Central Continuous post-processing-smoothing-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, and a reheating section. , balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final water cooling section.

Refer to Figure 36, which shows Embodiment 9 of the present invention. In Embodiment 9, the rapid hot-dip galvanizing ultra-high-strength strip production line includes the following stations: Uncoiling-Welding-Inlet Looper-Cleaning-Central Continuous Post Processing-flattening-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, an aerosol cooling section, and a pickling section. , reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final water cooling section equipment.

Refer to Figure 37, which shows Embodiment 10 of the present invention. In Embodiment 10, the rapid hot-dip galvanizing ultra-high-strength strip production line includes the following stations in sequence: Uncoiling-Welding-Inlet Loop-Cleaning-Central Continuous post-processing-smoothing-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a water quenching cooling section, and a pickling section. , reheating section, balanced heat preservation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section and final water cooling section.

Refer to Figure 38, which shows Embodiment 11 of the present invention. In Embodiment 11, the rapid hot-dip galvanizing ultra-high-strength strip production line includes the following stations in sequence: Uncoiling-Welding-Inlet Looper-Cleaning-Central Continuous Post-processing-smoothing-export looper-coiling;

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, an aerosol cooling section, and a water quenching cooling section. section, pickling section, reheating section, equalizing insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, post-plating cooling section and final water cooling part.

Referring to Figures 39 to 41, preferably, Embodiments 12 to 14 of the present invention are based on Embodiments 9 to 11, adding a flash iron or flash nickel plating section after the pickling section, and flash plating the strip. Then perform subsequent processing.

Preferably, after the air knife section, an optional mobile post-plating quick cooling section equipment is set up in parallel with the alloying heating section. After the strip is hot-dip galvanized from the zinc pot section and passes through the air knife section to control the coating weight, if hot-dip pure zinc is produced product, the mobile post-plating quick cooling section is switched to online use, and the alloying heating section equipment is offline; if alloyed hot-dip galvanizing products are produced, the mobile post-plating quick cooling section equipment is switched to offline, and the alloying heating section equipment is switched to Use online.

Preferably, a cleaning station is provided before the entrance looper station.

Preferably, a tension and straightening station equipment and a surface post-treatment station such as passivation or fingerprint resistance are simultaneously provided between the flattening station and the exit looper station. The strip steel can be selected for tension and straightening or/and passivation or fingerprint resistance. Wait for surface treatment before entering the outlet looper.

Example 1

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 3. The main chemical composition (mass%) of the substrate is 0.16% C-1.8% Si-2.3% Mn. The strip is uncoiled, welded, and imported. After the loop is passed and cleaned, it is preheated to 365°C by spray direct fire, then heated to 715°C by direct fire, then heated by the radiant tube to 815°C, then heated by transverse magnetic induction to 915°C, and the radiant tube is heated for 60°C at 915°C. Seconds, slow cooling to 675℃, high hydrogen cooling to 230℃, then heating to 420℃, at 420℃ Balanced heat preservation, and then reheated to 460°C for a second time, then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it is plated and then cooled to below 150°C. Then, it is finally water-cooled to room temperature, and then it is flattened and entered into the outlet looper. , and then coiled to complete production. The yield strength of the final product strip steel is 702MPa, the tensile strength is 1051MPa, and the elongation at break is 22%.

Example 2

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 4. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 355°C by spray direct fire, and then heated to 355°C by direct fire. 705℃, then the radiant tube is heated to 805℃, then the transverse magnetic induction is heated to 905℃, the radiant tube is soaked at 905℃ for 65 seconds, slowly cooled to 675℃, then the aerosol is cooled to below 50℃ for pickling, and then again Heated to 390°C, balanced heat preservation at 390°C and then reheated to 460°C, immersed in a zinc pot through the furnace nose for hot-dip galvanizing, controlled by an air knife to control the coating weight, then cooled to below 150°C, and then finally water-cooled to Room temperature, after being flattened, it enters the outlet looper, and then is rolled up to complete production.

Example 3

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 5. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 357°C by spray direct fire, and then heated to 357°C by direct fire. 720℃, then the radiant tube is heated to 820℃, then transverse magnetic induction heating to 910℃, the radiant tube is soaked at 910℃ for 56 seconds, slowly cooled to 670℃, then quenched with water and cooled to room temperature, then pickled, and then again Heated to 400°C, balanced heat preservation at 400°C and then reheated to 455°C, immersed in a zinc pot through the furnace nose for hot-dip galvanizing, controlled by an air knife to control the coating weight, then cooled to below 150°C, and then finally water-cooled to Room temperature, after being flattened, it enters the outlet looper, and then is rolled up to complete production.

Example 4

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 6. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 353°C by spray direct fire, and then heated to 353°C by direct fire. 700℃, then the radiant tube is heated to 800℃, then transverse magnetic induction heating to 900℃, the radiant tube is soaked at 900℃ for 68 seconds, slowly cooled to 660℃, then mist cooled to 410℃, then water quenched to Room temperature, then pickling, then reheated to 385°C, balanced and insulated at 385°C, then reheated to 455°C, immersed in the zinc pot through the furnace nose for hot-dip galvanizing, controlled by an air knife to control the coating weight, and then cooled after plating to below 150°C, and then finally water-cooled to room temperature. After being flattened, it enters the outlet loop and is then coiled to complete production.

Example 5

Preparation of a hot-dip galvanized ultra-high-strength steel strip. The production line is shown in Figure 7. Preparation of a high-strength steel. The main chemical composition (mass%) of the substrate is 0.08% C-0.35% Si-2.1% Mn. The strip steel After uncoiling, welding, passing of the entrance looper, and cleaning, use spray direct fire to preheat to 360°C, then direct fire to 720°C, then radiant tube heating to 820°C, and then transverse magnetic induction Heating to 920℃, soaking the radiant tube at 920℃ for 40 seconds, slowly cooling to 750℃, first aerosol cooling to 500℃, then water quenching to about 50℃, then pickling, then flash nickel plating, and then Heated to 410°C, balanced heat preservation at 410°C, then reheated to 455°C for a second time, immersed in a zinc pot through the furnace nose for hot-dip galvanizing, controlled by an air knife to control the coating weight, and then cooled to below 150°C, and then finally water-cooled to Room temperature, after being flattened, it enters the outlet looper, and then is rolled up to complete production. The yield strength of the final product strip steel is 951MPa, the tensile strength is 1239MPa, and the elongation at break is 8%.

Example 6

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 8. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 357°C by spray direct fire, and then heated to 357°C by direct fire. 720℃, then the radiant tube is heated to 820℃, then transverse magnetic induction heating to 910℃, the radiant tube is soaked at 910℃ for 56 seconds, slowly cooled to 670℃, then quenched with water to cool to room temperature, then pickled, and then Flash nickel plating, then reheat to 400℃, balance and maintain at 400℃, then reheat to 455℃, immerse in the zinc pot through the furnace nose and hot dip galvanize, use an air knife to control the coating weight, and then cool to 150℃ Next, it is finally water-cooled to room temperature, flattened and then entered into the outlet looper, and then coiled to complete production.

Example 7

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 9. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 353°C by spray direct fire, and then heated to 353°C by direct fire. 700℃, then the radiant tube is heated to 800℃, then transverse magnetic induction heating to 900℃, the radiant tube is soaked at 900℃ for 68 seconds, slowly cooled to 660℃, then mist cooled to 410℃, then water quenched to Room temperature, then pickling, then flash iron plating, then reheated to 385°C, balanced and insulated at 385°C, then reheated to 455°C, immersed in a zinc pot through the furnace nose, hot dip galvanized, and controlled by an air knife to control the coating weight After plating, it is cooled to below 150°C, and then finally water-cooled to room temperature. After being flattened, it enters the outlet looper, and then is coiled to complete production.

Example 8

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 10. The main chemical composition (mass%) of the substrate is 0.15% C-1.72% Si-2.28% Mn. The strip is uncoiled, welded, and inlet. After the sleeve is passed and cleaned, use spray direct fire to preheat to 355℃, then direct fire to 720℃, then the radiant tube is heated to 820℃, then transverse magnetic induction heating to 920℃, and the radiant tube is soaked at 920℃ for 80 seconds. , slow cooling to 670℃, high hydrogen cooling to 260℃, reheating to 410℃, balanced insulation at 410℃, then reheated to 455℃ twice, then immersed in the zinc pot through the furnace nose to hot dip galvanize, and the coating was controlled by an air knife After the weight, it enters the alloying heating furnace and is heated to 510°C, then alloyed and soaked at 505°C for 20 seconds, then cooled to below 200°C after plating, and then finally water-cooled to room temperature. After being flattened, it enters the outlet looper and is then coiled. , complete production. The yield strength of the final product strip is 693MPa, the tensile strength is 1018MPa, and the elongation at break is 21.5%.

Example 9

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 11. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 352°C by spray direct fire, and then heated to 352°C by direct fire. 705℃, then the radiant tube is heated to 805℃, then the transverse magnetic induction is heated to 905℃, the radiant tube is soaked at 905℃ for 65 seconds, slowly cooled to 675℃, then the aerosol is cooled to below 50℃ for pickling, and then again Heated to 390°C, balanced heat preservation at 390°C and then reheated to 460°C, immersed in the zinc pot through the furnace nose for hot-dip galvanizing, controlled the weight of the coating with an air knife, then entered the alloying heating section and heated to 510°C, and then at 510 After alloying and soaking for 20 seconds at ℃, it is then cooled to below 200℃ after plating, and then finally water-cooled to room temperature. After being flattened, it enters the outlet looper, and then is coiled to complete production.

Example 10

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 12. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 357°C by spray direct fire, and then heated to 357°C by direct fire. 720℃, then the radiant tube is heated to 820℃, then transverse magnetic induction heating to 910℃, the radiant tube is soaked at 910℃ for 56 seconds, slowly cooled to 670℃, then quenched with water and cooled to room temperature, then pickled, and then again Heated to 400℃, balanced heat preservation at 400℃ and then reheated to 460℃, immersed in the zinc pot through the furnace nose for hot-dip galvanizing, controlled the weight of the coating with an air knife, then entered the alloying heating section and heated to 515℃, and then at 510 After alloying and soaking for 18 seconds at ℃, it is plated and then cooled to below 200℃. Then it is finally water-cooled to room temperature. After being flattened, it enters the outlet looper and is then coiled to complete production.

Example 11

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 13. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 363°C by spray direct fire, and then heated to 363°C by direct fire. 700℃, then the radiant tube is heated to 800℃, then transverse magnetic induction heating to 900℃, the radiant tube is soaked at 900℃ for 68 seconds, slowly cooled to 660℃, then mist cooled to 410℃, and then water quenched to Room temperature, then pickling, then reheated to 385°C, balanced and insulated at 385°C, then reheated to 460°C, immersed in the zinc pot through the furnace nose for hot-dip galvanizing, and the weight of the coating was controlled by an air knife before entering alloying heating The section is heated to 520°C, then alloyed and soaked at 515°C for 16 seconds for plating, then cooled to below 200°C, then finally water-cooled to room temperature, flattened and entered into the outlet looper, and then coiled to complete production.

Example 12

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 14. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 366°C by spray direct fire, and then heated to 366°C by direct fire. 720°C, then the radiant tube is heated to 820°C, then transverse magnetic induction heating to 920°C, the radiant tube is soaked at 920°C for 40 seconds, slowly cooled to 750°C, first aerosol cooled to 500°C, and then water quenched to 50°C. °C, then pickling, then flash nickel plating, and then heated to 410 °C, and balanced heat preservation at 410 °C. Then it is reheated to 465°C for a second time and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the alloying heating section and is heated to 500°C. Then it is alloyed and soaked at 500°C for 25 seconds for post-plating. Cool to below 200°C, then finally water-cool to room temperature. After being flattened, it enters the outlet looper and is then coiled to complete production.

Example 13

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 15. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 357°C by spray direct fire, and then heated to 357°C by direct fire. 720℃, then the radiant tube is heated to 820℃, then transverse magnetic induction heating to 910℃, the radiant tube is soaked at 910℃ for 56 seconds, slowly cooled to 670℃, then quenched with water to cool to room temperature, then pickled, and then Flash nickel plating, then reheat to 400℃, balance the heat at 400℃ and then reheat to 460℃, immerse in the zinc pot through the furnace nose and hot dip galvanize, control the weight of the coating with an air knife, then enter the alloying heating section and heat to 530℃, then alloying and soaking at 520℃ for 15 seconds for plating, then cooled to below 200℃, then finally water-cooled to room temperature, flattened and entered into the outlet looper, and then coiled to complete production.

Example 14

Preparation of a hot-dip galvanized ultra-high-strength strip. The production line is shown in Figure 16. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 353°C by spray direct fire, and then heated to 353°C by direct fire. 700℃, then the radiant tube is heated to 800℃, then transverse magnetic induction heating to 900℃, the radiant tube is soaked at 900℃ for 68 seconds, slowly cooled to 660℃, then mist cooled to 410℃, then water quenched to Room temperature, then pickling, then flash iron plating, then reheated to 385°C, balanced and insulated at 385°C, then reheated to 465°C, immersed in the zinc pot through the furnace nose, hot-dip galvanized, and controlled by an air knife to control the coating weight The post-alloying heating section is heated to 525°C, and then alloyed and soaked at 520°C for 18 seconds for plating, then cooled to below 200°C, and then finally water-cooled to room temperature. After being flattened, it enters the outlet looper, and then is coiled to complete production.

Rapid annealing strip production line

Referring to Figures 43 to 45, they show Embodiments 1 to 3 of the present invention. The rapid annealing strip steel production line of the present invention includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing -Smoothing-export looper-coiling;

The central continuous post-processing station includes a preheating section, a heating section, a soaking section, a slow cooling section, a rapid cooling section, a reheating section, an over-aging section, a final jet cooling section, and a final water cooling section;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The heat soaking section uses radiant tubes for heat soaking;

The rapid cooling section adopts high hydrogen cooling, mist cooling or water quenching cooling.

Embodiments 1 to 3 of the present invention realize the simultaneous use of a spray direct-fire preheating device and high hydrogen cooling or mist cooling or water quenching cooling in one production line to perform rapid heating and rapid cooling processes to achieve continuous production of ultra-high-strength strip steel.

Refer to Figure 46, which shows Embodiment 4 of the present invention. In Embodiment 4, the rapid annealing strip steel production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post Processing-flattening-export looper-coiling;

The central continuous post-processing station includes a preheating section, a heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section and a water quenching cooling section, a reheating section, an over-aging section, a final jet cooling section, final water cooling section;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The rapid cooling section is arranged in parallel with high hydrogen cooling and aerosol cooling. The strip steel can choose to go to the high hydrogen cooling section for high hydrogen cooling, or it can choose to go to the aerosol cooling section for aerosol cooling;

The production line of Example 4 simultaneously uses a spray direct fire preheating device, high hydrogen cooling and mist cooling to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Referring to Figure 47, Embodiment 5 of the present invention, the rapid annealing strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling;

The central continuous post-processing station includes a preheating section, a heating section, a radiant tube soaking section, a slow cooling section, a rapid cooling section, a reheating section, an over-aging section, a final jet cooling section, and a final water cooling section;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The rapid cooling section is arranged in parallel with high hydrogen cooling and water quenching cooling. The strip steel can choose to go through the high hydrogen cooling section for high hydrogen cooling, or it can choose to go through the water quenching cooling section for water quenching cooling.

The production line described in Embodiment 5 of the present invention simultaneously uses a spray direct fire preheating device, high hydrogen cooling and water quenching cooling to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Refer to Figure 48, which shows Embodiment 6 of the present invention. In Embodiment 6, the rapid annealing strip steel production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post Processing-flattening-export looper-coiling;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The rapid cooling section adopts air mist cooling and water quenching cooling in parallel, and a connecting channel is provided between the air mist cooling and water quenching cooling; the strip steel can be air mist cooled first and then water quenched, or can only be air mist cooled or only water quenched. cool down;

The production line of Embodiment 6 of the present invention simultaneously uses a spray direct fire preheating device, a mist cooling section and a water quenching cooling section to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Referring to Figure 49, Embodiment 7 of the present invention, the rapid annealing strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The rapid cooling section adopts high hydrogen cooling, aerosol cooling, and water quenching cooling to be arranged in parallel, and a connecting channel is provided between the aerosol cooling and water quenching cooling.

The aerosol cooling section and the water quenching cooling section are arranged in series. The strip can be aerosol cooled first and then water quenched, or only aerosol cooled or only water quenched; the high hydrogen cooling section and (aerosol cooling section + water quenching cooling section) are arranged in parallel. The strip steel can choose to go to the hydrogen cooling section, or you can choose to go to the gas mist cooling + water quenching cooling section for rapid cooling.

The production line described in Example 7 simultaneously uses a spray direct fire preheating device, a high hydrogen cooling section and (aerosol cooling section + water quenching cooling section) to perform rapid heating and optional rapid cooling to achieve continuous ultra-high strength strip steel Production.

Referring to Figures 50 to 52, which show Embodiments 8 to 10 of the present invention, the rapid annealing strip steel production line includes the following stations in order: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - smoothing -Export looper-coiling;

The preheating section adopts a jet radiation composite heating device;

The heating section adopts a radiant tube heating section;

The rapid cooling section adopts high hydrogen cooling, mist cooling, or water quenching cooling;

The heat soaking section uses radiant tubes for heat soaking.

The production lines described in Embodiments 8 to 10 of the present invention simultaneously adopt a jet radiation composite heating device and a rapid cooling method of high hydrogen cooling, aerosol cooling or water quenching cooling to perform rapid heating and rapid cooling processes to achieve ultra-high strength belts. Continuous production of steel.

Refer to Figure 53, which shows Embodiment 11 of the present invention. Based on Embodiment 8, the rapid cooling section adopts a high hydrogen cooling section and a mist cooling section arranged in parallel. The strip steel can choose to go to the high hydrogen cooling section for high temperature cooling. For hydrogen cooling, you can also choose to use the gas mist cooling section for gas mist cooling.

The production line of Example 11 simultaneously uses a jet radiation composite heating device, high hydrogen cooling and mist cooling methods to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Refer to Figure 54, which shows Embodiment 12 of the present invention. Based on Embodiment 8, the rapid cooling section adopts The high hydrogen cooling section and the water quenching cooling section are arranged in parallel. The strip steel can choose to go to the high hydrogen cooling section for high hydrogen cooling, or it can choose to go to the water quenching cooling section for water quenching cooling.

The production line of Example 12 simultaneously uses a jet radiation composite heating device, high hydrogen cooling and water quenching cooling methods to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Referring to Figure 55, which shows Embodiment 13 of the present invention, the rapid annealing strip production line includes the following stations in order: uncoiling-welding-inlet looper-cleaning-central continuous post-processing-smoothing-outlet looper- take up;

The preheating section adopts a jet radiation composite heating device;

The heating section adopts a radiant tube heating section;

The rapid cooling section is arranged in parallel with air mist cooling and water quenching cooling, and a connecting channel is provided between the air mist cooling and water quenching cooling, so that the air mist cooling section and the water quenching cooling section are arranged in series, and the strip can be air-cooled first. Water quenching cooling may be followed by mist cooling, or only mist cooling or only water quenching cooling may be used.

The production line of Example 13 simultaneously uses a jet radiation composite heating device, a mist cooling section and a water quenching cooling section to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Referring to Figure 56, which shows Embodiment 14 of the present invention, the rapid annealing strip production line includes the following stations in order: uncoiling-welding-inlet looper-cleaning-central continuous post-processing-smoothing-outlet looper- take up;

The preheating section adopts a jet radiation composite heating device;

The heating section adopts a radiant tube heating section;

The rapid cooling section adopts high hydrogen cooling, gas mist cooling, and water quenching cooling to be arranged in parallel, and a connecting channel is provided between the gas mist cooling and water quenching cooling, forming a series arrangement of the gas mist cooling section and the water quenching cooling section.

The strip steel can be cooled by aerosol cooling first and then water quenching, or it can also be cooled by only aerosol cooling or only by water quenching; the high hydrogen cooling section is arranged in parallel with the (aerosol cooling section + water quenching cooling section), and the strip steel can choose to go higher In the hydrogen cooling section, you can also choose the gas mist cooling + water quenching cooling section for rapid cooling.

The production line of Example 14 simultaneously uses a jet radiation composite heating device, a high hydrogen cooling section and (aerosol cooling section + water quenching cooling section) to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Referring to Figures 57 to 59, which show Embodiments 15 to 17 of the present invention, the rapid annealing strip steel production line includes the following stations in order: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - smoothing -Export looper-coiling;

The central continuous post-processing station includes a preheating section, a heating section, a soaking section, a slow cooling section, a rapid cooling section, Reheating section, over-aging section, final jet cooling section, final water cooling section;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The soaking section uses a jet radiation composite heating device for soaking;

The production lines of Examples 15 to 17 simultaneously adopt a jet direct fire preheating device and a rapid cooling method of high hydrogen cooling, aerosol cooling or water quenching cooling to perform rapid heating and rapid cooling processing, and use a jet radiation composite heating device Perform uniform heating to achieve continuous production of ultra-high-strength strip steel.

Referring to Figures 60 and 61, they show Embodiments 18 and 19 of the present invention. Based on Embodiment 15, the rapid cooling section adopts high hydrogen cooling and gas mist cooling or water quenching cooling to be arranged in parallel.

The high hydrogen cooling section and the aerosol cooling section are arranged in parallel. The strip steel can choose to go to the high hydrogen cooling section for high hydrogen cooling, or it can choose to go to the aerosol cooling section for aerosol cooling. or,

The high hydrogen cooling section and the water quenching cooling section are arranged in parallel. The strip can choose to go to the high hydrogen cooling section for high hydrogen cooling, or it can choose to go to the water quenching cooling section for water quenching cooling.

Referring to Figure 62, which shows Embodiment 20 of the present invention, the rapid annealing strip production line includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling ;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The soaking section uses a jet radiation composite heating device for soaking;

The rapid cooling section is arranged in parallel with air mist cooling and water quenching cooling, and a connecting channel is provided between the air mist cooling and water quenching cooling, forming an air mist cooling section and a water quenching cooling section arranged in series. The strip can be air mist cooled first and then Water quench cooling, or only aerosol cooling or only water quench cooling.

The production line of Example 20 simultaneously uses a jet direct fire preheating device, aerosol cooling section and water quenching cooling section equipment to perform rapid heating and optional rapid cooling processing, and uses a jet radiation composite soaking section for heat soaking to achieve ultra-high performance. Continuous production of high-strength steel strips.

Refer to Figure 63, which shows Embodiment 21 of the present invention. The rapid annealing strip steel production line includes the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-levelling-exit looper-coiling ;

The preheating section adopts a spray direct fire preheating device;

The heating section adopts a direct fire heating section;

The soaking section uses a jet radiation composite heating device for soaking;

The rapid cooling section adopts high hydrogen cooling, aerosol cooling, and water quenching cooling to be arranged in parallel, and a connecting channel is provided between the aerosol cooling and water quenching cooling to form an aerosol cooling section and a water quenching cooling section arranged in series; the strip steel can Aerosol cooling first and then water quenching cooling, or only aerosol cooling or only water quenching cooling; the high hydrogen cooling section is arranged in parallel with (aerosol cooling section + water quenching cooling section), and the strip steel can choose to go to the high hydrogen cooling section , you can also choose to use the aerosol cooling + water quenching cooling section for rapid cooling;

The production line of Example 21 simultaneously uses a jet direct fire preheating device, a high hydrogen cooling section and (aerosol cooling section + water quenching cooling section) to perform rapid heating, optional rapid cooling, and a jet radiation composite heat equalizing device. Perform uniform heating to achieve continuous production of ultra-high-strength strip steel.

Referring to Figures 64 to 66, which show Embodiments 22 to 24 of the present invention, the rapid annealing strip steel production line includes the following stations in order: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - smoothing -Export looper-coiling;

The preheating section adopts a jet radiation composite heating device;

The heating section adopts a radiant tube heating section;

The rapid cooling section adopts high hydrogen cooling, aerosol cooling or water quenching cooling;

The soaking section uses a jet radiation composite heating device for soaking.

The production lines of Examples 22 to 24 simultaneously adopt a jet radiation composite heating device and a rapid cooling method of high hydrogen cooling or mist cooling or water quenching cooling to perform rapid heating and rapid cooling processes, and use a jet radiation composite heat equalizing device. Perform uniform heating to achieve continuous production of ultra-high-strength strip steel.

Referring to Figures 67 and 68, they show Embodiments 25 and 26 of the present invention. Based on Embodiment 22, the rapid cooling section adopts high hydrogen cooling and gas mist cooling or water quenching cooling to be arranged in parallel.

Referring to Figure 69, Embodiment 27 of the present invention, the rapid annealing strip production line includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling;

The preheating section adopts a jet radiation composite heating device;

The heating section adopts a radiant tube heating section;

The soaking section uses a jet radiation composite heating device for soaking;

The rapid cooling section adopts air mist cooling and water quenching cooling to be arranged in parallel, and a connecting channel is provided between the air mist cooling and water quenching cooling to form the air mist cooling section and the water quenching cooling section to be arranged in series; the strip can be air-cooled first Water quenching cooling may be followed by mist cooling, or only mist cooling or only water quenching cooling may be used.

The production line of Example 27 simultaneously uses a jet radiation composite heating device, aerosol cooling and water quenching cooling to perform rapid heating and optional rapid cooling, and uses a jet radiation composite heat equalizing device for uniform heat to achieve ultra-high strength strip steel. Continuous production.

Referring to Figure 70, Embodiment 28 of the present invention is based on Embodiment 27. The rapid cooling section adopts high hydrogen cooling, gas mist cooling, and water quenching cooling to be arranged in parallel, and there is a gap between gas mist cooling and water quenching cooling. A connecting channel is provided to form an air mist cooling section and a water quenching cooling section arranged in series; the strip can be air mist cooled first and then water quenched, or can be only air mist cooled or only water quenched; the high hydrogen cooling section is connected with the (gas (Mist cooling section + water quenching cooling section) are arranged in parallel. The strip steel can choose to go to the high hydrogen cooling section, or you can choose to go to the gas mist cooling + water quenching cooling section for rapid cooling.

The production line of Example 28 simultaneously uses a jet radiation composite heating device, a high hydrogen cooling section and (aerosol cooling section + water quenching cooling section) to perform rapid heating and optional rapid cooling, and uses a jet radiation composite heating device for homogenization. heat to achieve continuous production of ultra-high strength strip steel.

Referring to Figure 71, Embodiment 29 of the present invention is based on Embodiment 1, and an optional pickling section is provided after the final water cooling section. The strip can choose to pass through the pickling section, or it can bypass the pickling section. part.

Example 1

The main chemical composition (mass%) of the substrate is: 0.07% C-0.01% Si-0.8% Mn. After uncoiling, welding and cleaning, the strip is preheated to 358°C by spray direct fire, then heated to 650°C by direct fire, and then radiated The tube is heated to 790°C, the radiant tube is soaked at 790°C for 50 seconds, slowly cooled to 670°C, high hydrogen cooled to 250°C, over-aging treated (reheating without input), and finally jet cooled to about 140°C. Water-cool to room temperature, flatten and then coil up to complete production. The yield strength of the final product strip is 502MPa, the tensile strength is 613MPa, and the elongation at break is 16%.

Example 2

The main chemical composition (mass%) of the substrate is: 0.06% C-0.01% Si-0.75% Mn. After uncoiling, welding and cleaning, the strip is preheated to 351°C by spray direct fire, then heated to 650°C by direct fire, and then radiated The tube is heated to 790°C, the radiant tube is soaked at 790°C for 50 seconds, slowly cooled to 670°C, mist cooled to 270°C, and then subjected to over-aging treatment (reheating without input), and finally jet cooling to about 140°C Finally, the water is cooled to room temperature, flattened and rolled up to complete production. The yield strength of the final product strip is 536MPa, the tensile strength is 628MPa, and the elongation at break is 15%.

Example 3

The main chemical composition (mass%) of the substrate is: 0.06% C-0.008% Si-0.7% Mn. After uncoiling, welding and cleaning, the strip is preheated to 360°C by spray direct fire, then heated to 660°C by direct fire, and then radiated The tube is heated to 790°C, the radiant tube is soaked at 790°C for 50 seconds, slowly cooled to 670°C, water quenched to about 50°C, and then enters the over-aging section for heating to 230°C for over-aging treatment, and finally jet cooling to The temperature is around 140°C and finally water-cooled to room temperature, flattened and then rolled up to complete production. The yield strength of the final product strip is 567MPa, the tensile strength is 689MPa, and the elongation at break is 13%.

Example 4

The main chemical composition (mass%) of the substrate is: 0.065% C-0.009% Si-0.77% Mn. After uncoiling, welding and cleaning, the strip is preheated to 355°C by spray direct fire, then heated to 650°C by direct fire, and then radiated The tube is heated to 785°C, the radiant tube is soaked at 785°C for 40 seconds, slowly cooled to 675°C, first aerosol cooled to 500°C, then quenched with water to cool to about 50°C, and then heated to 230°C using a longitudinal magnetic induction heater. ℃ enters the over-aging section for over-aging treatment, and is finally air-cooled to about 140°C and finally water-cooled to room temperature. It is flattened and then rolled up to complete production. The yield strength of the final product strip is 537MPa, the tensile strength is 663MPa, and the elongation at break is 15%.

Example 5

The main chemical composition (mass%) of the substrate is: 0.095% C-0.17% Si-2.0% Mn. After uncoiling, welding and cleaning, the strip is heated to 670°C by jet radiation, and then heated to 810°C by the radiant tube. The lower radiant tube is soaked for 30 seconds, slowly cooled to 675°C, and the high hydrogen jet is cooled to about 250°C. Then it enters the over-aging section (reheating does not require input) for over-aging treatment, and finally the jet is cooled to about 140°C and finally water-cooled to Room temperature, flattened and then rolled up to complete production. The yield strength of the final product strip is 530MPa, the tensile strength is 920MPa, and the elongation at break is 19%.

Example 6

The main chemical composition (mass%) of the substrate is: 0.085% C-0.3% Si-2.3% Mn. After uncoiling, welding and cleaning, the strip is preheated to 355°C by spray direct fire, heated to 680°C by direct fire, and then radiant tube Heating to 800℃, then jet radiation composite soaking at 800℃ for 40 seconds, slowly cooling to 675℃, high hydrogen jet cooling to about 230℃, and then entering the over-aging section (reheating without investment) for over-aging treatment. Finally, the air is cooled to about 140°C and finally water-cooled to room temperature. It is flattened and then rolled up to complete production. The yield strength of the final product strip steel is 908MPa, the tensile strength is 1098MPa, and the elongation at break is 9%.

Example 7

The main chemical composition (mass%) of the substrate is: 0.12% C-0.28% Si-2.5% Mn. After uncoiling, welding and cleaning, Preheat by spray direct fire to 365℃, direct fire heating to 680℃, then heat the radiant tube to 830℃, then spray radiation composite soaking at 830℃ for 40 seconds, slowly cool to 700℃, first aerosol cool to 600℃ Then it is quenched with water and cooled to about 50°C, then heated to 220°C and entered into the over-aging section for over-aging treatment. Finally, it is jet-cooled to about 140°C and finally water-cooled to room temperature. It is flattened and rolled up to complete production. The yield strength of the final product strip steel is 1086MPa, the tensile strength is 1343MPa, and the elongation at break is 7%.

Example 8

The main chemical composition (mass%) of the substrate is: 0.08% C-0.012% Si-0.83% Mn. After uncoiling, welding and cleaning, the strip is heated to 500°C by jet radiation, and then heated to 790°C by the radiant tube. The lower jet radiation composite is soaked for 30 seconds, slowly cooled to 700°C, the high hydrogen jet is cooled to about 250°C, and then enters the over-aging section (reheating does not require investment) for over-aging treatment, and finally the jet is cooled to about 140°C and finally water-cooled to room temperature, flattened and then rolled up to complete production. The yield strength of the final product strip is 456MPa, the tensile strength is 539MPa, and the elongation at break is 23%.

Example 9

The main chemical composition (mass%) of the substrate is: 0.065% C-0.012% Si-0.85% Mn. After uncoiling, welding and cleaning, the strip is preheated to 360°C by spray direct fire, then heated to 670°C by direct fire, and then radiated The tube is heated to 800°C, the radiant tube is soaked at 800°C for 60 seconds, slowly cooled to 675°C, mist cooled to 260°C, followed by over-aging treatment (reheating without investment), and finally jet cooled to about 140°C. Finally, the water is cooled to room temperature, and then pickled. After pickling, it is flattened and coiled to complete production. The yield strength of the final product strip is 556MPa, the tensile strength is 658MPa, and the elongation at break is 14%.

Rapid annealing high strength strip production line

Refer to Figures 72 to 74, which show Embodiments 1 to 3 of the present invention. In Embodiments 1 to 3, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: Uncoiling-Welding-Inlet Loop-cleaning-central continuous post-processing-smoothing-export loop-coiling;

The central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, and a rapid cooling section (high hydrogen cooling section, or aerosol cooling section). or water quenching cooling section), reheating section, over-aging section, final jet cooling section, final water cooling section;

The jet radiation composite heating section installs the radiant tube inside the high-speed jet heating wind box to quickly transfer the heat generated by the combustion gas of the radiant tube to the strip through both high-speed jet and radiation to achieve rapid heating of the strip;

The transverse magnetic induction heating section is used to further rapidly increase the temperature of high-temperature strip steel.

The production line simultaneously uses a jet radiation composite heating section + transverse magnetic induction heating section and a high hydrogen cooling section or aerosol cooling section Or a rapid cooling equipment in the water quenching cooling section, which performs rapid heating and rapid cooling to achieve continuous production of ultra-high strength strip steel.

Refer to Figure 75, which shows Embodiment 4 of the present invention. In Embodiment 4, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling - welding - entrance looper - cleaning - central continuous post-processing -Smoothing-export looper-coiling;

The central continuous post-processing station consists of a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a rapid cooling section (high hydrogen cooling section and aerosol cooling section), and then Heating section, over-aging section, final jet cooling section, final water cooling section;

The jet radiation composite heating section installs the radiant tube inside the high-speed and high-temperature jet heating wind box to quickly transfer the heat generated by the combustion gas of the radiant tube to the strip through two methods: high-speed and high-temperature jet and radiation, thereby realizing rapid heating of the strip;

The high hydrogen cooling section and the gas mist cooling section are arranged in parallel. The strip steel can choose to go to the high hydrogen cooling section for high hydrogen cooling, or it can choose to go to the gas mist cooling section for aerosol cooling.

The production line simultaneously uses a jet radiation composite heating section, a high hydrogen cooling section and a mist cooling section to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high-strength strip steel.

Refer to Figure 76, which shows Embodiment 5 of the present invention. In Embodiment 5, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling - welding - entrance looper - cleaning - central continuous post-processing -Smoothing-export looper-coiling;

The central continuous post-processing station consists of a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a rapid cooling section (high hydrogen cooling section and water quenching cooling section), Reheating section, over-aging section, final jet cooling section, final water cooling section;

The jet radiation composite heating section installs the radiant tube inside the high-speed jet air box and quickly transfers the heat generated by the combustion gas of the radiant tube to the strip through two methods: high-speed and high-temperature jet and radiation, thereby realizing rapid heating of the strip;

The transverse magnetic induction heating section is used to further quickly increase the temperature of the high-temperature strip steel;

The production line simultaneously uses jet radiation composite heating section, high hydrogen cooling section and water quenching cooling section equipment to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high-strength strip steel.

Refer to Figure 77, which shows Embodiment 6 of the present invention. In Embodiment 6, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling - welding - entrance looper - cleaning - central continuous post-processing -Smoothing-export looper-coiling;

The central continuous post-processing station consists of a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a rapid cooling section (aerosol cooling section and water quenching cooling section), Reheating section, over-aging section, final jet cooling section, final water cooling section;

The aerosol cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section; the strip steel can be air mist cooled first and then water quenched, or it can be only air mist cooled or Only water quench cooling.

The production line simultaneously uses a jet radiation composite heating section, a transverse magnetic induction heating section, an aerosol cooling section and a water quenching cooling section to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high-strength strip steel.

Refer to Figure 78, which shows Embodiment 7 of the present invention. In Embodiment 7, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling - welding - entrance looper - cleaning - central continuous post-processing -Smoothing-export looper-coiling;

The central continuous post-processing station includes a jet radiation composite heating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a rapid cooling section (high hydrogen cooling section and aerosol cooling section and water quenching section). Cooling section), reheating section, over-aging section, final jet cooling section, final water cooling section;

The high hydrogen cooling section, the aerosol cooling section, and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section;

For strip steel, you can choose only high hydrogen cooling, only gas mist cooling, or only water quenching cooling; you can also choose gas mist cooling first and then water quenching cooling for rapid cooling.

The production line simultaneously uses a jet radiation composite heating section, a transverse magnetic induction heating section, a high hydrogen cooling section and (aerosol cooling section + water quenching cooling section) to perform rapid heating and optional rapid cooling to achieve continuous ultra-high strength strip steel Production.

Preferably, the soaking section of the radiant tube is replaced by a jet radiation composite heating device to perform soaking treatment on the strip to achieve rapid adjustment of the soaking temperature of the strip when the strip thickness specifications change, target temperature changes, unit speed changes and other working conditions change.

Preferably, an optional flash plating section is provided after the pickling section. After the strip is pickled, you can choose to perform flash nickel plating or flash zinc plating, or you can skip the flash plating section and directly produce pickled surface products.

Preferably, the cleaning station is arranged between the welding station and the inlet looper station. Further preferably, the cleaning station is located between the inlet looper station and the inlet looper station. Cleaning stations are set up before and after the work station. The strip is cleaned for the first time, enters the looper, then cleaned for the second time, and then enters the central continuous post-processing station.

Preferably, an intermediate looper station is set up before the leveling station. After central continuous post-processing of the strip, it enters the central looper and then enters leveling. This allows the central continuous post-processing to be performed without slowing down the speed of the leveling machine to replace the work roll.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is also provided between the flattening station and the outlet looper station. The strip steel can choose to undergo surface post-processing such as passivation or fingerprint resistance before entering the outlet looper.

Preferably, a tension and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are also provided between the flattening station and the exit looper station. The strip steel can be optionally subjected to tension and straightening or/and passivation or fingerprint resistance. Wait for surface post-processing before entering the outlet looper.

Referring to Figure 72, a high-strength steel is produced using the production line described in Example 1. The main chemical composition (mass%) of the substrate is 0.10% C-0.18% Si-1.96% Mn strip steel, which is uncoiled, welded, passed through the entrance looper, and cleaned. Finally, the jet radiation composite heating is to 600°C, then the radiant tube is heated to 810°C, and then the transverse magnetic induction is heated to 920°C. The radiant tube is soaked at 920°C for 40 seconds, slowly cooled to 670°C, and the high hydrogen jet is cooled to 250°C. or so, and then enters the over-aging section (reheating without investment) for over-aging treatment. Finally, it is jet-cooled to about 140°C and finally water-cooled to room temperature. After smoothing, the outlet loop is passed and coiled to complete production. The yield strength of the final product strip is 519MPa, the tensile strength is 955MPa, and the elongation at break is 20%.

Referring to Figure 73, on the basis of the production line described in Example 2, a pickling section is set up after the final water cooling section to produce a high-strength steel. The main chemical composition (mass%) of the substrate is 0.06% C-0.010% Si-0.90% After the Mn strip is uncoiled, welded, passed through the entrance looper, and cleaned, the jet radiation is heated to 500°C, then the radiant tube is heated to 710°C, and then the transverse magnetic induction is heated to 810°C. The radiant tube is soaked at 810°C for 60 seconds. , slowly cooled to 675℃, mist cooled to 500℃, then water quenched to room temperature, then heated to 230℃, then over-aging treated, finally spray cooled to about 140℃, finally water cooled to room temperature, and then pickled. , after pickling, it is flattened, passed through the outlet looper, and rolled up to complete production. The yield strength of the final product strip is 585MPa, the tensile strength is 696MPa, and the elongation at break is 13%.

Referring to Figure 74, on the basis of the production line described in Example 3, a pickling section and a flash plating section are set up after the final water cooling section to produce an ultra-high-strength steel. The main chemical composition (mass%) of the substrate is 0.11% C-0.23 After the %Si-2.38%Mn strip is uncoiled, welded, passed through the entrance looper, and cleaned, the jet radiation composite heating is performed to 565°C, the radiant tube is heated to 730°C, and then the transverse magnetic induction heating is performed to 830°C, and then radiated at 830°C. The tube is soaked for 60 seconds, slowly cooled to 700°C, then quenched with water to cool to about 50°C, then heated to 230°C to enter the over-aging section for over-aging treatment, and finally air-jet cooled to about 140°C and finally water-cooled to room temperature, and then Pickling, then flash nickel plating, and finally smoothing, the outlet looper is passed and coiled to complete production. The yield strength of the final product strip steel is 1093MPa, the tensile strength is 1359MPa, and the elongation at break is 5%.

Rapid annealing ultra-high strength strip production line

Referring to Figure 79, Embodiment 1 of the present invention, the rapid annealing ultra-high strength strip production line includes the following stations in order: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - exit looper - coiling ;in,

The central continuous post-processing station includes a spray direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a transverse magnetic induction heating section, a soaking section, a slow cooling section, a rapid cooling section, a reheating section, and an over-aging section. section, final jet cooling section, final water cooling section;

The rapid cooling section adopts a high hydrogen cooling section;

In this production line, a jet direct fire preheating section, a transverse magnetic induction heating section and a high hydrogen cooling section are used to perform rapid heating and rapid cooling processes to achieve continuous production of ultra-high strength strip steel.

Refer to Figure 80, which shows Embodiment 2 of the present invention. In Embodiment 2, the rapid annealing ultra-high strength strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing - Leveling - Exit looper - Coiling; where,

The central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a radiant tube heating section, a soaking section, a slow cooling section, a rapid cooling section, a reheating section, an over-aging section, and a final jet cooling section. section, final water cooling section;

The rapid cooling section adopts an aerosol cooling section.

Refer to Figure 81, which shows Embodiment 3 of the present invention. In Embodiment 3, the rapid annealing ultra-high-strength strip steel production line includes the following stations in order: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - Leveling - Exit looper - Coiling; where,

The rapid cooling section adopts water quenching cooling section.

Refer to Figure 82, which shows Embodiment 4 of the present invention. In Embodiment 4, the rapid annealing ultra-high strength strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing - Leveling - Exit looper - Coiling; where,

The rapid cooling section adopts a high hydrogen cooling section and an aerosol cooling section arranged in parallel. The strip steel can choose to go to the high hydrogen cooling section for high hydrogen cooling, or it can choose to go to the aerosol cooling section for aerosol cooling.

In this production line, the spray direct fire preheating section, high hydrogen cooling section and mist cooling section can be used at the same time to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Refer to Figure 83, which shows Embodiment 5 of the present invention. In Embodiment 5, the rapid annealing ultra-high-strength strip steel production line of the present invention includes the following stations in order: Uncoiling-Welding-Inlet Loop-Cleaning-Central Continuous Post-processing-smoothing-export looper-coiling; among which,

The rapid cooling section adopts a high hydrogen cooling section and a water quenching cooling section arranged in parallel. The strip steel can choose to go through the high hydrogen cooling section for high hydrogen cooling, or it can choose to go through the water quenching cooling section for water quenching cooling.

In this production line, a jet direct fire preheating section, a high hydrogen cooling section and a water quenching cooling section are simultaneously used to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Refer to Figure 84, which shows Embodiment 6 of the present invention. In Embodiment 6, the rapid annealing ultra-high strength strip production line of the present invention includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous Post-processing-smoothing-export looper-coiling; among which,

The rapid cooling section adopts an air mist cooling section and a water quenching cooling section arranged in parallel, and a connecting channel is provided between the air mist cooling section and the water quenching cooling section to form a strip steel with an air mist cooling section first and then a water quenching cooling section, or There are three rapid cooling methods: only through the gas mist cooling section or only through the water quenching cooling section.

The rapid cooling section adopts an aerosol cooling section and a water quenching cooling section;

In this production line, a spray direct fire preheating section, a mist cooling section and a water quenching cooling section are simultaneously used to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel.

Refer to Figure 85, which shows Embodiment 7 of the present invention. In Embodiment 7, the rapid annealing ultra-high-strength strip steel production line of the present invention includes the following stations in order: Uncoiling-Welding-Inlet Loop-Cleaning-Central Continuous Post-processing-smoothing-export looper-coiling; among which,

The rapid cooling section also includes a high hydrogen cooling section, which is arranged in parallel with the aerosol cooling section and the water quenching cooling section, and the aerosol cooling section and the water quenching cooling section are arranged in series to form four rapid cooling sections. Cooling method, i.e. high hydrogen cooling only section, or only the aerosol cooling section, or only the water quenching cooling section, or first the aerosol cooling section and then the water quenching cooling section.

In this production line, a spray direct fire preheating section, a high hydrogen cooling section and a (gas mist cooling section + water quenching cooling section) are simultaneously used to perform rapid heating and optional rapid cooling to achieve continuous production of ultra-high strength strip steel .

Example 1

Prepare a high-strength steel strip. The production line layout is shown in Figure 2. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 355°C by spray direct fire, heated to 655°C by direct fire, and then heated by radiant tubes. to 810°C, then transverse magnetic induction heating to 910°C, then jet radiation composite soaking at 910°C for 60 seconds, slow cooling to 700°C, then high hydrogen cooling to 320°C, and then overaging treatment (reheating) at 320°C It does not need to be put into use), and is finally cooled by air jet to about 140°C and finally water-cooled to room temperature, then flattened and then entered into the outlet looper, and finally coiled to complete production.

Example 2

A high-strength steel strip is prepared. The production line layout is shown in Figure 3. The main chemical composition (mass%) of the substrate is: 0.10% C-0.23% Si-2.1% Mn strip steel uncoiling, welding, entrance looper passing, and cleaning Finally, spray direct fire to preheat to 360℃, direct fire to 660℃, then the radiant tube is heated to 830℃, then transverse magnetic induction heating to 930℃, then the radiant tube is soaked at 930℃ for 50 seconds, and slowly cooled to 750℃. ℃, then spray cooling to 300 ℃, then over-aging treatment at 280 ℃ (reheating does not need to be put into use), finally spray cooling to about 140 ℃ and finally water cooling to room temperature, followed by pickling treatment, and then smoothed and entered into the outlet Looper, and finally coiling to complete production. The yield strength of the final product strip steel is 972MPa, the tensile strength is 1196MPa, and the elongation at break is 11%.

Example 3

Prepare a high-strength steel strip. The production line layout is shown in Figure 4. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 375°C by spray direct fire, heated to 635°C by direct fire, and then heated by radiant tubes. to 800°C, then transverse magnetic induction heating to 850°C, then air jet radiation composite soaking at 850°C for 70 seconds, slow cooling to 740°C, then water quenching to cool to about 50°C, then heated to 320°C, and then heated to 320°C °C for over-aging treatment, and finally air-jet cooling to about 140 °C and finally water cooling to room temperature, then flattened and then entered into the outlet looper, and finally coiled to complete production.

Example 4

A high-strength steel strip is prepared. The production line layout is shown in Figure 5. The main chemical composition (mass%) of the substrate is: After the 0.09% C-0.013% Si-0.87% Mn strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 370°C by spray direct fire, then heated to 700°C by direct fire, and then heated to 800°C by the radiant tube. , and finally the transverse magnetic induction heating to 850°C, the jet radiation composite soaking at 850°C for 50 seconds, and the slow cooling to 670°C. At this time, high hydrogen cooling or aerosol cooling can be selected. In this embodiment, high hydrogen jet cooling is selected. to about 230°C, and then enters the over-aging section (reheating without investment) for over-aging treatment. Finally, it is jet-cooled to about 140°C and finally water-cooled to room temperature. After being flattened, it enters the outlet looper and is finally coiled to complete production. The yield strength of the final product strip is 476MPa, the tensile strength is 556MPa, and the elongation at break is 24%.

Example 5

Prepare a high-strength steel strip. The production line layout is shown in Figure 6. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 358°C by spray direct fire, then heated to 690°C by direct fire, and then radiant tube Heating to 790°C, and finally transverse magnetic induction heating to 890°C, air jet radiation composite soaking at 890°C for 50 seconds, and slow cooling to 670°C. At this time, high hydrogen cooling or water quenching cooling can be selected. In this embodiment, The water is quenched and cooled to room temperature, then heated to 280°C, and then enters the over-aging section for over-aging treatment at 280°C. Finally, it is jet-cooled to about 140°C and finally water-cooled to room temperature. After being flattened, it enters the outlet looper, and finally is coiled to complete. Production.

Example 6

Prepare a high-strength strip steel. The production line layout is shown in Figure 7. The main chemical composition (mass%) of the substrate is: 0.10% C-0.18% Si-2.0% Mn strip steel uncoiling, welding, entrance looper passing, cleaning Finally, spray direct fire to preheat to 365℃, direct fire to 665℃, then the radiant tube is heated to 820℃, then transverse magnetic induction heating to 920℃, then the radiant tube is soaked at 920℃ for 60 seconds, and slowly cooled to 750℃ ℃, at this time, you can choose air mist cooling, water quenching cooling, or you can choose air mist cooling first and then water quenching cooling. In this embodiment, the strip steel is first air mist cooled to 500°C, and then water quenched to about 50°C. It is then heated to 230°C for over-aging treatment, finally air-cooled to about 140°C and finally water-cooled to room temperature, then flattened, entered into the outlet looper, and finally coiled to complete production. The yield strength of the final product strip steel is 956MPa, the tensile strength is 1183MPa, and the elongation at break is 13%.

Example 7

Prepare a high-strength steel strip. The production line layout is shown in Figure 8. After the strip is uncoiled, welded, passed through the entrance looper, and cleaned, it is preheated to 395°C by spray direct fire, heated to 700°C by direct fire, and then heated by radiant tubes. to 800°C, then transverse magnetic induction heating to 890°C, then jet radiation composite soaking at 890°C for 60 seconds, and slow cooling to 750°C. At this time, you can choose high hydrogen cooling, aerosol cooling, or water. For quenching cooling, you can also choose to air mist cooling first and then water quenching. In this example, the strip steel is air mist cooled to about 50°C, then heated to 260°C for over-aging treatment, and finally air-jet cooled to about 140°C and finally water-cooled. to room temperature, then flattened, entered into the outlet looper, and finally coiled to complete production.

Ultra-short process dual-purpose strip production line

Referring to Figure 86, the ultra-short flow dual-purpose strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entry looper-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a transverse magnetic induction heating section, a radiant tube soaking section, a mist cooling section or/and a water quenching cooling section, a pickling section, a reheating section, and a parallel arrangement (furnace nose section + zinc Pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final air jet cooling section), and final water cooling section.

(furnace nose section + zinc pot section + air knife section + post-plating cooling section) is arranged in parallel with (moving channel section + overaging section + final jet cooling section). The strip steel can choose to go through the furnace nose section + zinc pot section + gas Tool section + post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products. You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, the continuous annealing process path is used to produce continuously annealed products. ;

The moving channel section is connected in parallel with the furnace nose section. The moving channel section can be moved to an online position or to an offline position. By cutting the strip and re-threading it, the continuous withdrawal process path and the hot-dip pure zinc process path can be switched. .

Refer to Figure 87, which shows Embodiment 2 of the present invention. In Embodiment 2, the ultra-short flow dual-purpose strip production line of the present invention includes the following stations in sequence: Uncoiling-Welding-Inlet Loop-Central Continuous Post-processing-smoothing-export looper-coiling; among which,

The central continuous post-processing station includes a transverse magnetic induction heating section, a radiant tube soaking section, a mist cooling section or/and a water quenching cooling section, a pickling section, a reheating section, and a parallel arrangement (furnace nose section + zinc Pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), and final water cooling section.

The invention designs a parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), The strip steel can choose to go through the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, the alloyed hot-dip galvanizing process path is used to produce alloyed hot-dip products. When the alloying heating section + alloying soaking section are not started and put into operation, the strip steel passes through these process sections to produce hot-dip pure zinc products. You can also choose to use the moving channel section + overaging section + final jet cooling Duan, that is, walking and retreating The process path produces continuously annealed products.

Refer to Figure 88, which shows Embodiment 3 of the present invention. In Embodiment 3, the ultra-short flow dual-purpose strip production line of the present invention includes the following stations in sequence: Uncoiling-Welding-Inlet Loop-Central Continuous Post-processing-smoothing-export looper-coiling; among which,

The central continuous post-processing station includes a transverse magnetic induction heating section, a radiant tube soaking section, an aerosol cooling section or/and a water quenching cooling section, a pickling section, a reheating section, a balanced insulation section, and a secondary reheating section. , the (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section) and final water cooling section are arranged in parallel.

The invention designs a parallel arrangement (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final air jet cooling section). The strip can choose to go through the furnace nose section + zinc pot Section + air knife section + post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products. You can also choose to use the moving channel section + overaging section + final air jet cooling section, that is, the continuous retreat process path is used for production. Continuously annealed products.

The mobile channel section and the furnace nose section are designed in parallel. The mobile channel section can be moved to the online position or to the offline position. By cutting the strip steel and re-threading the strip, the continuous withdrawal process path and the hot-dip pure zinc process path can be realized. switch.

Refer to Figure 89, which shows Embodiment 4 of the present invention. In Embodiment 4, the ultra-short flow dual-purpose strip production line of the present invention includes the following stations in sequence: Uncoiling-Welding-Inlet Loop-Central Continuous Post-processing-smoothing-export looper-coiling; among which,

The central continuous post-processing station includes a transverse magnetic induction heating section, a radiant tube soaking section, an aerosol cooling section or/and a water quenching cooling section, a pickling section, a reheating section, a balanced insulation section, and a secondary reheating section. , the parallel arrangement of (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), and finally Water cooling section.

The design of this invention adopts a balanced insulation section + a secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel. Art; It is also characterized by the gas mist cooling section or/and water quenching cooling section. The strip steel can be cooled by gas mist or water quenching, or can be cooled by gas mist first and then water quenched.

Refer to Figures 90 to 93, which show Embodiments 5 to 8 of the present invention. In Embodiments 5 to 8, the present invention also arranges a movable post-plating quick cooling section after the air knife section. The movable post-plating quick cooling section It is set for online and offline switching, and is arranged in parallel with the alloying heating section (designed to be movable and convenient for maintenance). When producing hot-dip pure zinc products, the movable post-plating quick cooling section is online to quickly cool the plated strip. At this time, the alloying heating section is offline; when producing alloyed hot-dip galvanized products, the movable post-plating quick cooling section is offline. At this time, the alloying heating section is online and the strip steel is alloyed and heated.

Preferably, a surface post-processing station such as passivation or fingerprint resistance is set between the flattening station and the exit looper station. Surface post-treatments such as passivation or fingerprint resistance can be performed before entering the exit loop.

Example 1

The main chemical composition (mass%) of the substrate is: 0.10% C-0.07% Si-1.908% Mn. After uncoiling and welding, the strip is heated to 810°C by transverse magnetic induction, cooled to 230°C by mist, then naturally cooled, and pickled. , then heated to 220°C for over-aging treatment, finally jet-cooled to about 140°C and finally water-cooled to room temperature, then flattened and coiled to complete production. The yield strength of the final product strip is 720MPa, the tensile strength is 998MPa, and the elongation at break is 8%.

Example 2

The main chemical composition (mass%) of the substrate is: 0.05% C-0.23% Si-1.35% Mn strip steel is uncoiled and welded, heated to 800°C by transverse magnetic induction, and soaked in a radiant tube at 800°C for 30 seconds, first with aerosol Cool to 650°C and then quench with water to cool to room temperature, then pickle, then heat to 460°C for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it is alloyed and heated to 500°C. Alloying is soaked at 500°C for 20 seconds. It is then cooled after plating, finally water-cooled to room temperature, flattened and then rolled up to complete production. The yield strength of the final product strip is 582MPa, the tensile strength is 809MPa, and the elongation at break is 15%.

Example 3

The main chemical composition (mass%) of the substrate is: 0.18% C-1.65% Si-2.1% Mn strip steel is uncoiled and welded, heated to 846°C by transverse magnetic induction, soaked at 845°C for 60 seconds, and cooled to 700℃ and then water quenched to room temperature, then pickled, then heated to 400℃ for balanced heat preservation, and then heated to 455℃ for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it is cooled after plating, and finally water-cooled to room temperature, flattened and rolled Take it and complete the production. The final product strip steel has a yield strength of 742MPa, a tensile strength of 1108MPa, and an elongation at break of 13%.

Under the current situation of increasing market demand for ultra-high-strength steel year by year and increasingly strict restrictions on CO2 and NOx emissions, the present invention has very broad application prospects, especially in urban steel plants.

Ultra-short process hot-dip pure zinc high-strength strip production line

Refer to Figure 94, which shows Embodiment 1 of the present invention. In Embodiment 1, the ultra-short process hot-dip pure zinc high-strength strip production line of the present invention includes the following stations in sequence: uncoiling-welding-entrance looper- Central continuous post-processing-export looper-flattening-coiling;

The central continuous post-processing station includes rapid heating station, soaking station, rapid cooling station, surface modification station and hot-dip pure zinc station;

The rapid heating station adopts direct fire heating equipment;

The heat soaking station adopts radiant tube heat soaking equipment or jet radiation composite heat soaking equipment;

The rapid cooling station adopts aerosol cooling equipment;

The surface modification station adopts pickling equipment;

The hot-dip pure zinc station is sequentially equipped with a reheating section, a furnace nose section, a zinc pot section, an air knife section, a post-plating cooling section and a final water-cooling section.

At this point, the production line uses both direct-fire heating equipment and aerosol cooling equipment for rapid heating and rapid cooling, and pickling equipment is used for surface modification to improve the plateability of ultra-high-strength steel and realize hot-dip galvanized ultra-high-strength strip steel. of continuous production.

Refer to Figure 95, which shows Embodiment 2 of the present invention. In Embodiment 2, the ultra-short process hot-dip pure zinc high-strength strip production line of the present invention includes the following stations: Uncoiling-Welding-Inlet Loop-Central Continuous post-processing-export looper-flattening-coiling;

The rapid heating station adopts direct fire heating equipment;

The rapid cooling station adopts water quenching cooling equipment;

The surface modification station adopts pickling equipment;

At this point, the production line uses both direct-fired heating equipment and water quenching cooling equipment for rapid heating and rapid cooling, and uses pickling equipment for surface modification to improve the plateability of ultra-high-strength steel and realize hot-dip galvanized ultra-high-strength strips. Continuous production of steel.

Refer to Figure 96, which shows Embodiment 3 of the present invention. In Embodiment 3, the ultra-short process hot-dip pure zinc high-strength strip production line of the present invention includes the following stations: Uncoiling-Welding-Inlet Loop-Central Continuous post-processing-export looper-flattening-coiling;

The central continuous post-processing station includes a rapid heating station, a soaking station, a rapid cooling station, a surface modification station and a hot-dip pure zinc station;

The rapid heating station adopts direct fire heating equipment;

The rapid cooling station includes both aerosol cooling equipment and water quenching cooling equipment;

The surface modification station adopts pickling equipment;

The hot-dip pure zinc station is successively equipped with a reheating section, a furnace nose section, a zinc pot section, an air knife section, a post-plating cooling section and a final water cooling section. The strip steel can be directly cooled by water quenching at the rapid cooling station. treatment, you can also choose to perform aerosol cooling first and then water quenching cooling.

At this point, the production line uses direct-fired heating section equipment and aerosol cooling section equipment + water quenching cooling section equipment for rapid heating and rapid cooling, and uses pickling equipment for surface modification to improve the plateability of ultra-high-strength steel and achieve Continuous production of hot-dip galvanized ultra-high strength strip.

Refer to Figures 97 to 99, which show Embodiments 4 to 6 of the present invention. In Embodiments 4 to 6, the rapid heating station adopts direct fire heating equipment and transverse magnetic induction heating equipment to be arranged in series, and the strip steel is rapidly The heating station first conducts direct fire heating, and then conducts transverse magnetic induction heating to complete the rapid heating process, and then performs subsequent processing.

Refer to Figures 100 to 105, which show Embodiments 7 to 12 of the present invention. In Embodiments 7 to 12, in the surface modification station, electroplating iron or flash nickel plating equipment is also provided after the pickling section. , after pickling the strip, you can choose to flash a layer of iron or nickel on the surface of the strip, and then perform subsequent hot-dip galvanizing.

Refer to Figure 106, which shows Embodiment 13 of the present invention. In Embodiment 13, the ultra-short process alloyed hot-dip galvanizing ultra-high-strength strip steel production line of the present invention includes the following stations: uncoiling-welding-entry looper -Central continuous post-processing-export looper-flattening-coiling;

The central continuous post-processing station includes a rapid heating station, a soaking station, a rapid cooling station, a surface modification station and an alloying hot-dip galvanizing station;

The rapid heating station adopts direct fire heating equipment;

The heat soaking station adopts a radiant tube heat soaking device or a jet radiation composite heat soaking device;

The rapid cooling station adopts aerosol cooling equipment;

The surface modification station adopts pickling equipment;

The alloyed hot-dip galvanizing station is sequentially equipped with a reheating section, a furnace nose section, a zinc pot section, an air knife section, an alloying heating section, an alloying soaking section, a post-plating cooling section and a final water cooling section.

At this point, the production line uses both direct-fired heating section equipment and aerosol cooling section equipment for rapid heating and rapid cooling, and pickling equipment is used to improve the plateability of ultra-high-strength steel and achieve continuous hot-dip galvanizing of alloyed ultra-high-strength strip steel. Production.

Refer to Figure 107, which shows Embodiment 14 of the present invention. In Embodiment 14, the ultra-short process alloyed hot-dip galvanizing high-strength strip steel production line of the present invention includes the following stations: uncoiling-welding-entrance looper- Central continuous post-processing-export looper-flattening-coiling;

The rapid heating station adopts direct fire heating section equipment;

The rapid cooling station adopts water quenching cooling equipment;

The surface modification station adopts pickling equipment;

At this point, the production line uses both direct-fired heating section equipment and water quenching cooling section equipment for rapid heating and rapid cooling, and uses pickling equipment to improve the plateability of ultra-high-strength steel and realize alloyed hot-dip galvanized ultra-high-strength strips. Continuous production of steel.

Refer to Figure 108, which shows Embodiment 15 of the present invention. In Embodiment 15, the ultra-short process alloyed hot-dip galvanizing high-strength strip steel production line of the present invention includes the following stations: Uncoiling-Welding-Inlet looper- Central continuous post-processing-export looper-flattening-coiling;

The rapid heating station adopts direct fire heating section equipment;

The surface modification station adopts pickling equipment;

At this point, the production line uses direct-fired heating section equipment and aerosol cooling section equipment + water quenching cooling section equipment for rapid heating and rapid cooling, and pickling equipment is used to improve the plateability of ultra-high-strength steel and achieve alloying hot plating. Continuous production of zinc ultra-high strength strip.

Refer to Figures 109 to 111, which show Embodiments 16 to 18 of the present invention. In Embodiments 16 to 18, in the ultra-short process alloyed hot-dip galvanizing high-strength strip steel production line of the present invention, the central continuous The rapid heating station of the processing station uses direct fire heating equipment and transverse magnetic induction heating equipment in series. The strip steel is first heated by direct fire and then heated by transverse magnetic induction at the rapid heating station to complete the rapid heating process and then undergo subsequent processing.

The surface modification station of the central continuous post-processing station of the present invention is also equipped with flash iron plating or flash nickel plating equipment after the pickling equipment. After the strip steel is pickled, a layer of iron or flash plating can be selected on the strip surface. Nickel and then subsequent alloying hot dip galvanizing.

The alloying hot-dip galvanizing station of the central continuous post-processing station is equipped with a mobile post-plating quick cooling section equipment in parallel with the alloying heating section equipment after the air knife section. The strip steel is hot-dip galvanized from the zinc pot section equipment. After the air knife section equipment controls the coating weight, if hot-dip pure zinc products are produced, the mobile post-plating rapid cooling section equipment will be switched online and the alloying heating section equipment will be offline; if alloyed hot-dip galvanizing products are produced, the mobile post-plating rapid cooling section equipment will be used online. Switch the cold section equipment offline and switch the alloying heating section equipment Use online.

Preferably, a cleaning station equipment is set up between the welding station and the entrance looper station. The strip can be cleaned through the cleaning station equipment, or the cleaning station can be bypassed.

Preferably, the cleaning station equipment is set up immediately after the entrance looper station, and the strip steel can choose to be cleaned through the cleaning station equipment, or it can bypass the cleaning station.

Preferably, surface post-processing station equipment such as passivation or fingerprint resistance is also provided between the flattening station and the outlet looper station. The strip steel can optionally undergo surface treatment such as passivation or fingerprint resistance before entering the outlet looper.

Preferably, electric radiant tube soaking section equipment, resistance wire soaking section equipment, or resistance band soaking section equipment are used instead of radiant tube soaking equipment or jet radiation composite soaking equipment to be used in the construction of the invention in places where gas supply is tight. The above production line produces hot-dip galvanized high-strength strip steel.

Example 1

Preparation of a hot-dip pure zinc high-strength strip. The production line is shown in Figure 3. The main chemical composition (mass%) of the substrate is 0.12% C-0.50% Si-2.0% Mn. The hot-rolled pickled strip is uncoiled and welded. , after the entrance looper passes, it is heated to 700℃ by direct fire, the radiant tube is soaked for 40 seconds, the aerosol is cooled to about 80℃, pickled, and then heated to 460℃, and then immersed in the zinc pot for hot-dip galvanizing after passing through the furnace nose. , after controlling the weight of the coating with an air knife, it is cooled after plating, and then finally water-cooled, then flattened, passed through the outlet looper, and then rolled up to complete production. The yield strength of the final product strip steel is 800MPa, the tensile strength is 1196MPa, and the elongation at break is 11%.

Example 2

Preparation of a hot-dip pure zinc high-strength strip. The production line is shown in Figure 7. The strip whose main chemical composition (mass%) of the substrate is 0.085% C-0.16% Si-2.0% Mn is uncoiled, welded, and the entrance looper passes through Finally, direct fire heating to 700°C, then transverse magnetic induction heating to 820°C, radiant tube soaking for 30 seconds, water quenching and cooling to about 50°C, pickling, then reheating to 460°C, and immersed in a zinc pot after passing through the furnace nose. For hot-dip galvanizing, the coating weight is controlled by an air knife and then cooled after plating, and then finally water-cooled, followed by flattening, passing the outlet looper and then coiling to complete production. The yield strength of the final product strip is 595MPa, the tensile strength is 998MPa, and the elongation at break is 10.5%.

Example 3

Preparation of a hot-dip pure zinc high-strength strip. The production line is shown in Figure 11. The main chemical composition (mass%) of the substrate is 0.095% C-1.5% Si-2.4% Mn. The hot-rolled pickled strip is uncoiled, welded, After the entrance looper passes, it is heated to 700°C by direct fire, and the air jet radiation composite is soaked for 20 seconds. It is first cooled to about 400°C by aerosol mist, then quenched with water to about 50°C, pickled, electroplated with nickel, and then heated to 455°C. After passing through the furnace nose, it is immersed in the zinc pot for hot-dip galvanizing. The weight of the coating is controlled by an air knife and then cooled after plating. Then it is finally water-cooled to room temperature, and then flattened, passed through the outlet looper, and then rolled up to complete production. The yield strength of the final product strip steel is 816MPa, the tensile strength is 1190MPa, and the elongation at break is 9%.

Example 4

Preparation of a hot-dip pure zinc high-strength strip. The production line is shown in Figure 14. The strip whose main chemical composition (mass%) of the substrate is 0.12% C-0.27% Si-2.5% Mn is uncoiled, welded, and the entrance looper passes through Finally, direct fire heating to 680°C, then transverse magnetic induction heating to 830°C, radiant tube soaking for 40 seconds, mist cooling to 720°C, then water quenching to cool to about 50°C, pickling, and then heating to 460°C. After passing through the furnace nose, it is immersed in the zinc pot for hot-dip galvanizing. The weight of the coating is controlled by an air knife and then cooled after plating. Then it is finally water-cooled and then flattened. The outlet looper is passed and then coiled to complete production. The final product strip steel has a yield strength of 1013MPa, a tensile strength of 1296MPa, and an elongation at break of 7%.

Example 5

Preparation of a hot-dip pure zinc high-strength strip. The production line is shown in Figure 20. The strip whose main chemical composition (mass%) of the substrate is 0.08% C-0.3% Si-2.33% Mn is uncoiled, welded, and the entrance looper passes through Finally, direct fire heating to 670°C, then transverse magnetic induction heating to 810°C, radiant tube soaking for 40 seconds, first aerosol cooling to about 500°C, then water quenching to about 50°C, pickling, and then heating to 455°C. After passing through the furnace nose, it is immersed in the zinc pot for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the alloying heating section and is heated to 520°C for alloying. Then it enters the alloying soaking section and is soaked at 515°C for 25 seconds before proceeding. After plating, it is cooled, and then finally water-cooled to room temperature, followed by smoothing, and the outlet loop is passed through and then coiled to complete production. The yield strength of the final product strip steel is 816MPa, the tensile strength is 1190MPa, and the elongation at break is 9%.

Example 6

Preparation of a hot-dip pure zinc high-strength strip. The production line is based on Figure 20 and adds a balanced insulation section and a secondary reheating section after the reheating section. The main chemical composition (mass%) of the substrate is 0.185% C -After the strip steel with 1.75% Si-2.75% Mn is uncoiled, welded and passed through the entrance looper, it is heated to 730°C by direct fire, then heated to 910°C by transverse magnetic induction, soaked by the radiant tube for 40 seconds, and then cooled to 230°C by mist Then, quench with water to about 50°C, pickle, first step, heat to 400°C, keep warm for 80 seconds in the balanced insulation section, then heat to 460°C in the second step, pass through the furnace nose and then immerse in the zinc pot for hot plating. Zinc, via After the air knife controls the weight of the coating, it enters the alloying heating section and is heated to 510°C for alloying. Then it enters the alloying soaking section and is soaked at 500°C for 30 seconds. It is then cooled after plating, and then finally water-cooled to room temperature, and then flattened. , the export looper passes through and then is rolled up to complete production. The yield strength of the final product strip steel is 1015MPa, the tensile strength is 1212MPa, and the elongation at break is 14.6%.

Ultra-short process and ultra-high strength strip production line

Refer to Figure 112, which shows Embodiment 1 of the present invention. In Embodiment 1, the ultra-short flow ultra-high-strength strip steel production line of the present invention includes the following stations in sequence: Uncoiling-Welding-Inlet Loop-Central Continuous post-processing-export looper-coiling; among which,

The central continuous post-processing station includes a rapid heating station, a soaking station and a rapid cooling station in sequence;

The rapid heating station adopts a jet radiation composite heating device;

The rapid cooling station adopts high hydrogen cooling equipment.

Refer to Figure 113, which shows Embodiment 2 of the present invention. In Embodiment 2, the ultra-short flow ultra-high-strength strip steel production line of the present invention includes the following stations in sequence: Uncoiling-Welding-Inlet Loop-Central Continuous post-processing-export looper-coiling; among which,

The rapid heating station adopts a jet radiation composite heating device;

The rapid cooling station adopts aerosol cooling equipment.

Refer to Figure 114, which shows Embodiment 3 of the present invention. In Embodiment 3, the ultra-short flow ultra-high-strength strip steel production line of the present invention includes the following stations in order: Uncoiling-Welding-Inlet Loop-Central Continuous post-processing-export looper-coiling; among which,

The rapid heating station adopts a jet radiation composite heating device;

The rapid cooling station adopts water quenching cooling equipment.

Refer to Figure 115, which shows Embodiment 4 of the present invention. In Embodiment 4, the rapid heating station adopts a jet radiation composite heating device and a transverse magnetic induction heating device arranged in series, and the rapid cooling station adopts a gas The mist cooling equipment and the water quenching cooling equipment are arranged in series or parallel.

Refer to Figure 116, which shows Embodiment 5 of the present invention. In Embodiment 5, the rapid heating station adopts a jet radiation composite heating device and a transverse magnetic induction heating device arranged in series, and the rapid cooling station adopts a high-temperature heating device. Hydrogen cooling equipment Arranged in parallel with water quenching cooling equipment.

Refer to Figure 117, which shows Embodiment 6 of the present invention. In Embodiment 6, the rapid heating station adopts a jet radiation composite heating device and a transverse magnetic induction heating device arranged in series, and the rapid cooling station adopts a high-temperature heating device. The hydrogen cooling equipment and the aerosol cooling equipment are arranged in parallel.

Refer to Figure 118, which shows Embodiment 7 of the present invention. In Embodiment 7, the rapid heating station adopts a jet radiation composite heating device and a transverse magnetic induction heating device arranged in series, and the rapid cooling station adopts a high-temperature heating device. The hydrogen cooling equipment, the water quenching cooling equipment and the aerosol cooling equipment are arranged in parallel, and the aerosol cooling equipment and the water quenching cooling equipment are arranged in series.

Referring to Figures 119 to 125, they show Embodiments 8 to 14 of the present invention. Embodiments 8 to 14 are based on Embodiments 1 to 7 and are respectively provided with an adjustable welding station between the welding station and the entrance looper station. Selected cleaning station.

Referring to Figures 126 to 132, they show Embodiments 15 to 21 of the present invention. Embodiments 15 to 21 are based on Embodiments 1 to 7. The rapid heating station adopts a jet radiation composite heating device arranged in series. + Transverse magnetic induction heating equipment for rapid heating.

Referring to Figures 133 to 139, they show Embodiments 22 to 28 of the present invention. Embodiments 22 to 28 are based on Embodiments 1 to 7. The rapid heating station adopts optional longitudinal magnetic induction heating equipment and The air jet radiation composite heating device + transverse magnetic induction heating equipment arranged in series are further arranged in series. The strip can be heated by the longitudinal magnetic induction heating equipment first, or it can bypass the longitudinal magnetic induction heating equipment and directly enter the air jet radiation compound heating device + arranged in series. Heating is performed by transverse magnetic induction heating.

Example 1

As shown in Figure 112, the strip steel is uncoiled and welded and then enters the entrance looper. It is then heated to 780°C by jet radiation composite, soaked at 780°C by jet radiation composite, then cooled to room temperature with high hydrogen, enters the outlet looper, and is finally rolled. Take it and complete the production.

Example 2

As shown in Figure 113, the main chemical composition (mass%) of the substrate is: 0.095% C-0.05% Si-1.88% Mn strip steel is uncoiled and welded into the entrance looper, heated to 820°C by jet radiation, and then radiated The tube is soaked for 40 seconds, then the aerosol is cooled to 250°C and then naturally cooled to room temperature. It enters the outlet loop and is then coiled to complete production. The yield strength of the final product strip is 710MPa, the tensile strength is 993MPa, and the elongation at break is 9%.

Example 3

As shown in Figure 114, the strip steel is uncoiled and welded and then enters the entrance looper. It is then heated to 800°C by jet radiation compound, soaked at 800°C by jet radiation compound, then quenched with water to cool to room temperature, enters the outlet looper, and is finally rolled. Take it and complete the production.

Example 4

As shown in Figure 115, the strip steel is uncoiled and welded and then enters the entrance looper. It is then heated to 800°C by jet radiation compound, soaked at 800°C by jet radiation compound, then quenched with water to cool to room temperature, enters the outlet looper, and is finally rolled. Take it and complete the production.

Example 5

As shown in Figure 116, the strip steel is uncoiled and welded and then enters the entrance looper. It is then heated to 820°C by jet radiation composite and soaked at 820°C. High hydrogen cooling to room temperature can be selected, or water quenching cooling can be selected. to room temperature, then enters the outlet looper, and finally is coiled to complete production.

Example 6

As shown in Figure 117, the strip steel is uncoiled and welded and then enters the entrance looper. It is then heated to 850°C using jet radiation composite, and is heated at 850°C by jet radiation composite. You can choose high hydrogen cooling to room temperature or aerosol cooling. to room temperature, then enters the outlet looper, and finally is coiled to complete production.

Example 7

As shown in Figure 118, the strip steel is uncoiled and welded and then enters the entrance looper. It is then heated to 870°C by jet radiation composite, and is heated at 870°C by jet radiation composite. You can choose high hydrogen cooling to room temperature or aerosol cooling. To room temperature, you can also choose water quenching to cool to room temperature, then enter the outlet looper, and finally coil up to complete production.

Example 8

As shown in Figure 119, after the strip is uncoiled and welded, you can choose to clean it first and then enter the entrance looper, or you can choose to enter the entrance looper directly, and then use jet radiation composite heating to 815°C, and then spray radiation composite soaking at 815°C, and then The high hydrogen is cooled to room temperature, enters the outlet looper, and is finally coiled to complete production.

Example 9

As shown in Figure 120, the main chemical composition (mass%) of the substrate is: 0.095% C-0.05% Si-1.88% Mn. After the strip is uncoiled and welded, you can choose to clean it first and then enter the entrance loop, or you can choose to enter the entrance loop directly. The sleeve is heated to 825°C by jet radiation composite, and then the radiant tube is soaked for 50 seconds. Then the aerosol is cooled to 235°C and then naturally cooled to room temperature. It enters the outlet looper and is then coiled to complete production. The yield strength of the final product strip is 775MPa, the tensile strength is 1053MPa, and the elongation at break is 7%.

Example 10

As shown in Figure 121, after the strip is uncoiled and welded, you can choose to clean it first and then enter the entrance looper, or you can choose to enter the entrance looper directly, and then use jet radiation composite heating to 805℃, and then use jet radiation composite soaking at 805℃, and then The water is quenched and cooled to room temperature, enters the outlet looper, and is finally coiled to complete production.

Example 11

As shown in Figure 122, after the strip is uncoiled and welded, you can choose to clean it first and then enter the entrance looper, or you can choose to enter the entrance looper directly, and then use jet radiation composite heating to 825°C, and then spray radiation composite soaking at 825°C, and then The water is quenched and cooled to room temperature, enters the outlet looper, and is finally coiled to complete production.

Example 12

As shown in Figure 123, after the strip is uncoiled and welded, you can choose to clean it first and then enter the entrance looper, or you can choose to enter the entrance looper directly, and then use jet radiation composite heating to 835°C. At 835°C, jet radiation composite soaking can Choose high hydrogen to cool to room temperature, or choose water quenching to cool to room temperature, then enter the outlet looper, and finally coil up to complete production.

Example 13

As shown in Figure 124, after the strip is uncoiled and welded, you can choose to clean it first and then enter the entrance looper, or you can choose to enter the entrance looper directly, and then use jet radiation composite heating to 855°C. At 855°C, jet radiation composite soaking can Choose high hydrogen to cool to room temperature, or choose aerosol to cool to room temperature, then enter the outlet looper, and finally coil up to complete production.

Example 14

As shown in Figure 125, the strip steel is uncoiled and welded and then enters the entrance looper. It is then heated to 870°C using jet radiant composite heating. At 870°C, the jet radiant composite is homogenized. You can choose high hydrogen cooling to room temperature or aerosol cooling. To room temperature, you can also choose water quenching to cool to room temperature, then enter the outlet looper, and finally coil up to complete production.

Example 15

As shown in Figure 126, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 780°C by jet radiation composite, and then heated to 880°C by transverse magnetic induction. It is heated by jet radiation composite soaking at 880°C, and then cooled to At room temperature, it enters the outlet looper and is finally rolled up to complete production.

Example 16

As shown in Figure 127, the main chemical composition (mass%) of the substrate is: 0.095% C-0.05% Si-1.88% Mn. After uncoiling and welding, the strip enters the entrance looper. The strip is first heated to 820°C by jet radiation composite. Then conduct transverse magnetic induction heating to 920°C. The radiant tube is then soaked for 40 seconds, and then the aerosol is cooled to 250°C and then naturally cooled to room temperature, entering the outlet loop, and then coiled to complete production. The final product strip steel has a yield strength of 765MPa, a tensile strength of 1043MPa, and an elongation at break of 8%.

Example 17

As shown in Figure 128, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 800°C by jet radiation composite, and then heated to 900°C by transverse magnetic induction. It is heated by jet radiation composite soaking at 900°C, and then cooled by water quenching to At room temperature, it enters the outlet looper and is finally rolled up to complete production.

Example 18

As shown in Figure 129, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 800°C by jet radiation compound, and then heated to 900°C by transverse magnetic induction. Then it is quenched with water and cooled to room temperature, enters the outlet looper, and is finally rolled. Take it and complete the production.

Example 19

As shown in Figure 130, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 820°C by jet radiation composite, and then heated to 920°C by transverse magnetic induction. You can choose high hydrogen cooling to room temperature or water quenching cooling. to room temperature, then enters the outlet looper, and finally is coiled to complete production.

Example 20

As shown in Figure 131, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated by jet radiation to 750°C, and then heated by transverse magnetic induction to 850°C. You can choose high hydrogen cooling to room temperature or aerosol cooling. to room temperature, then enters the outlet looper, and finally is coiled to complete production.

Example 21

As shown in Figure 132, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 770°C by jet radiation compound, and then heated to 870°C by transverse magnetic induction. At 870°C, the strip is heated by jet radiation compound, and high hydrogen cooling is optional. to room temperature, you can also choose aerosol cooling to room temperature, or you can choose water quenching to cool to room temperature, then enter the outlet looper, and finally coil up to complete production.

Example 22

As shown in Figure 133, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 420°C by longitudinal magnetic induction, then combined with jet radiation heating to 780°C, and then heated to 880°C by transverse magnetic induction. At 880°C, the strip is heated by jet radiation. The compound is soaked and heated, and then the high hydrogen is cooled to room temperature, enters the outlet looper, and is finally coiled to complete production.

Example 23

As shown in Figure 134, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 450°C by longitudinal magnetic induction, then combined with jet radiation heating to 820°C, and then heated to 920°C by transverse magnetic induction, and then uniformly heated by the radiant tube. 40 seconds, then the aerosol is cooled to 250°C and then naturally cooled to room temperature, entering the outlet looper, and then coiled to complete production.

Example 24

As shown in Figure 135, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 400°C by longitudinal magnetic induction, then combined with jet radiation heating to 800°C, and then heated to 900°C by transverse magnetic induction. At 900°C, the strip is heated by jet radiation. The composite is soaked and soaked, then quenched with water to cool to room temperature, then enters the outlet looper, and finally coiled to complete production.

Example 25

As shown in Figure 136, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 480°C by longitudinal magnetic induction, then combined with jet radiation heating to 820°C, and then heated to 900°C by transverse magnetic induction, and then cooled by water quenching. At room temperature, it enters the outlet looper and is finally rolled up to complete production.

Example 26

As shown in Figure 137, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 350°C by longitudinal magnetic induction, then combined with jet radiation heating to 840°C, and then heated to 920°C by transverse magnetic induction. High hydrogen cooling can be selected. To room temperature, you can also choose water quenching to cool to room temperature, then enter the outlet looper, and finally coil up to complete production.

Example 27

As shown in Figure 138, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 410°C by longitudinal magnetic induction, then combined with jet radiation heating to 700°C, and then heated to 850°C by transverse magnetic induction. High hydrogen cooling can be selected. to room temperature, or you can choose to cool the aerosol to room temperature, then enter the outlet looper, and finally wind up to complete production.

Example 28

As shown in Figure 139, after the strip is uncoiled and welded, it enters the entrance looper. The strip is first heated to 500°C by longitudinal magnetic induction, then combined with jet radiation heating to 800°C, and then heated to 930°C by transverse magnetic induction. At 930°C, the strip is heated by jet radiation. For compound uniform heating, you can choose high hydrogen cooling to room temperature, aerosol cooling to room temperature, or water quenching to room temperature, then enter the outlet looper, and finally take up to complete production.

Ultra-short process hot-dip galvanized high-strength strip production line

Refer to Figure 140, which shows Embodiment 1 of the present invention. In Embodiment 1, the ultra-short process hot-dip pure zinc high-strength strip production line includes the following stations in order: Uncoiling-Welding-Inlet Loop-Central Continuous post-processing - outlet looper - smoothing - coiling; wherein, the central continuous post-processing station includes a rapid heating section, a soaking section, a rapid cooling section and a hot-dip galvanizing section in sequence;

The rapid heating section is direct fire heating, the soaking section is jet radiation composite soaking, and the rapid cooling section is high hydrogen cooling;

The hot-dip galvanizing section consists of a furnace nose, a zinc pot, an air knife, post-plating cooling equipment and final water cooling equipment.

This production line simultaneously uses direct fire heating, high hydrogen cooling and jet radiation composite soaking in the same production line for rapid heating and rapid cooling to achieve continuous production of hot-dip galvanized high-strength strip steel.

Refer to Figure 141, which shows Embodiment 2 of the present invention. In Embodiment 2, the ultra-short process alloyed hot-dip galvanizing high-strength strip steel production line of the present invention includes the following stations in sequence: uncoiling - welding - entrance looper - Central continuous post-processing-export looper-flattening-coiling; among which,

The central continuous post-processing station includes a rapid heating section, a soaking section, a rapid cooling section and an alloyed hot-dip galvanizing section;

The rapid heating section is direct fire heating;

The soaking section is jet radiation composite soaking;

The rapid cooling section is high hydrogen cooling;

The alloyed hot-dip galvanizing section includes a furnace nose, a zinc pot, an air knife, alloying heating equipment, alloying heat soaking equipment, post-plating cooling equipment and final water cooling equipment.

This production line simultaneously uses direct fire heating, high hydrogen cooling and jet radiation composite soaking in the same production line for rapid heating and rapid cooling to achieve continuous production of alloyed hot-dip galvanized high-strength strip steel.

Referring to Figure 142, Embodiment 3 of the present invention is based on Embodiment 1. The hot-dip galvanizing section of the central continuous post-processing station is equipped with an optional mobile post-plating fastener after the air knife and in front of the post-plating cooling equipment. Cold equipment, the strip steel is immersed in a zinc pot for hot-dip galvanizing and then an air knife is used to control the coating weight. You can choose to use mobile post-plating rapid cooling equipment for post-plating rapid cooling, or you can choose not to use mobile post-plating rapid cooling equipment for natural cooling. Then perform post-plating cooling to achieve continuous production of hot-dip galvanized high-strength strip steel.

Referring to Figure 143, Embodiment 4 of the present invention is based on Embodiment 2. The hot-dip galvanizing section of the central continuous post-processing station is equipped with an optional mobile post-plating fastener after the air knife and in front of the post-plating cooling equipment. Cold equipment, the strip steel is immersed in the zinc pot for hot-dip galvanizing and then goes through the air knife section to control the coating weight. You can choose to use the mobile post-plating rapid cooling equipment for post-plating rapid cooling, or you can choose not to use the mobile post-plating rapid cooling equipment for natural cooling. and then perform post-plating cooling to achieve continuous hot-dip galvanized high-strength strip steel. Production.

Refer to Figure 144, which shows Embodiment 5 of the present invention. In Embodiment 5, the ultra-short process hot-dip galvanizing high-strength strip steel production line of the present invention includes the following stations in sequence: uncoiling-welding-entry looper -Central continuous post-processing-export looper-flattening-coiling; among which,

The central continuous post-processing station includes a rapid heating section, a soaking section, a rapid cooling section and a hot-dip galvanizing section in sequence;

The rapid heating section adopts direct fire heating and (jet radiation composite heating + transverse magnetic induction heating) arranged in series;

The soaking section is jet radiation composite soaking;

The rapid cooling section is high hydrogen cooling;

This production line uses direct fire heating + transverse magnetic induction heating in the same production line to form a rapid heating section for rapid heating, and then uses high hydrogen cooling for rapid cooling to achieve rapid heating and rapid cooling of high-strength steel, and ultimately achieve high-strength hot-dip galvanizing Continuous production of strip steel.

Refer to Figure 145, which shows Embodiment 6 of the present invention. In Embodiment 6, the ultra-short process alloyed hot-dip galvanizing high-strength strip steel production line of the present invention includes the following stations in sequence: uncoiling-welding-entry activity Set-central continuous post-processing-export looper-flattening-coiling; among them,

The soaking section is jet radiation composite soaking;

The rapid cooling section is high hydrogen cooling;

This production line simultaneously uses direct fire heating + (jet radiation composite heating + transverse magnetic induction heating) in the same production line to form a rapid heating section for rapid heating, and then uses high hydrogen cooling for rapid cooling to achieve rapid heating and rapid cooling of high-strength steel. , and finally realize the continuous production of alloyed hot-dip galvanized high-strength strip steel.

Refer to Figure 146, which shows Embodiment 7 of the present invention. Embodiment 7 is based on Embodiment 5. The hot-dip galvanizing section of the central continuous post-processing station is arranged after the air knife and in front of the post-plating cooling equipment. Optional mobile post-plating quick cooling equipment. The strip is immersed in a zinc pot for hot-dip galvanizing and then goes through the air knife section to control the coating weight. You can choose to use the mobile post-plating quick cooling equipment for post-plating quick cooling, or you can not choose to use mobile plating. The post-quick cooling equipment performs natural cooling and then post-plating cooling to achieve continuous production of hot-dip galvanized high-strength strip steel.

Refer to Figure 147, which shows Embodiment 8 of the present invention. Embodiment 8 is based on Embodiment 6. The hot-dip galvanizing section of the central continuous post-processing station is arranged after the air knife and in front of the post-plating cooling equipment. Optional mobile post-plating rapid cooling equipment with After the steel is immersed in the zinc pot for hot-dip galvanizing, the coating weight is controlled by the air knife section. You can choose to use mobile post-plating rapid cooling equipment for post-plating rapid cooling, or you can choose not to use mobile post-plating rapid cooling equipment for natural cooling before plating. After cooling, the continuous production of hot-dip galvanized high-strength strip steel is realized.

Example 1

To manufacture a high-strength steel, the production line layout is shown in Figure 140. The main chemical composition (mass%) of the substrate is 0.05% C-0.01% Si-1.3% Mn. The hot-rolled pickled strip steel is uncoiled, welded, and the entrance looper passes Afterwards, direct fire heating to 700°C, jet radiation compound soaking for 20 seconds, high hydrogen cooling to 460°C, immersion in the zinc pot through the furnace nose for hot-dip galvanizing, air knife control of the coating weight, post-plating cooling, and then final water cooling , after passing through the export looper, it is then flattened and coiled to complete production. The yield strength of the final product strip is 326MPa, the tensile strength is 442MPa, and the elongation at break is 35%.

Example 2

To manufacture a high-strength steel, the production line layout is shown in Figure 141. The main chemical composition (mass%) of the substrate is 0.06% C-0.015% Si-1.35% Mn. The hot-rolled pickled strip steel is uncoiled, welded, and the entrance looper passes Afterwards, direct fire heating to 700°C, jet radiation composite soaking for 30 seconds, high hydrogen cooling to 460°C, immersion in the zinc pot through the furnace nose for hot-dip galvanizing, controlling the weight of the coating with an air knife, then entering the alloying heating furnace and heating to 510°C ℃, alloying and soaking at 500℃ for 20 seconds, followed by post-plating cooling, and then final water cooling. After passing through the outlet looper, it is then flattened and coiled to complete production. The yield strength of the final product strip is 370MPa, the tensile strength is 435MPa, and the elongation at break is 34%.

Example 3

To manufacture a high-strength steel, the production line layout is shown in Figure 144. The main chemical composition (mass%) of the substrate is 0.095% C-0.18% Si-2.0% Mn. After the strip is uncoiled, welded, and the entrance looper passes, direct fire Heated to 650℃, then heated by jet radiation compound to 750℃, then heated by transverse magnetic induction to 800℃, soaked by jet radiation compound for 30 seconds, cooled to 460℃ by high hydrogen, immersed in zinc pot through furnace nose for hot dip galvanizing, passed through gas After the knife controls the weight of the coating, it is cooled after plating, and then finally water-cooled. After passing through the outlet looper, it is then flattened and coiled to complete production. The yield strength of the final product strip is 565MPa, the tensile strength is 912MPa, and the elongation at break is 16%.

Example 4

To manufacture a high-strength steel, the production line layout is shown in Figure 145. The main chemical composition (mass%) of the substrate is 0.09% C-0.17% Si-1.96% Mn. After the strip is uncoiled, welded, and the entrance looper passes, the The fire is heated to 650℃, then the jet radiation compound is heated to 780℃, then the transverse magnetic induction is heated to 850℃, the jet radiation compound is soaked for 40 seconds, the high hydrogen is cooled to 460℃, and the furnace nose is immersed in the zinc pot for hot-dip galvanizing. The air knife controls the weight of the coating and then enters the alloying heating furnace. Heat to 515°C, alloy and soak for 25 seconds at 510°C, cool after plating, and then finally water-cooled. After passing through the outlet looper, it is then flattened and coiled to complete production. The yield strength of the final product strip is 530MPa, the tensile strength is 890MPa, and the elongation at break is 17%.

Example 5

To manufacture a high-strength steel, the production line layout is shown in Figure 146. The main chemical composition (mass%) of the substrate is 0.085% C-0.26% Si-2.3% Mn. After the strip is uncoiled, welded, and the entrance looper passes, direct fire Heated to 730℃, then heated by jet radiation compound to 810℃, then heated by transverse magnetic induction to 910℃, soaked by jet radiation compound for 30 seconds, cooled to 460℃ by high hydrogen, immersed in zinc pot through furnace nose for hot dip galvanizing, passed through gas After the knife controls the weight of the coating, it is first moved and plated, quickly cooled to 365°C, and then cooled after plating, and then finally water-cooled. After passing through the outlet looper, it is then flattened and coiled to complete production. The yield strength of the final product strip steel is 908MPa, the tensile strength is 1192MPa, and the elongation at break is 9%.

Example 6

To manufacture a high-strength steel, the production line layout is shown in Figure 147. The main chemical composition (mass%) of the substrate is 0.055% C-0.008% Si-1.25% Mn. After the strip is uncoiled, welded, and the entrance looper passes, direct fire Heated to 600℃, then jet radiation composite heating to 700℃, then transverse magnetic induction heating to 730℃, then jet radiation composite soaking for 30 seconds, high hydrogen cooling to 460℃, immersed in the zinc pot through the furnace nose for hot dip galvanizing, after After the air knife controls the weight of the coating, it enters the alloying heating furnace and is heated to 505°C. The alloying is soaked at 505°C for 22 seconds, followed by post-plating cooling, and then final water cooling. After passing through the outlet looper, it is then flattened and coiled. Complete production. The yield strength of the final product strip is 336MPa, the tensile strength is 436MPa, and the elongation at break is 37%.

Referring to Figure 148, the flexible cold-rolled strip post-processing production line suitable for producing a variety of high-strength steels according to the present invention includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate Looper-smoothing-export looper-finishing-coiling; among them,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, an optional transverse magnetic induction heating section or a muffle furnace section arranged in parallel, a jet radiation composite soaking section, a slow cooling section, a rapid Cooling section, reheating section; the rapid cooling section includes high hydrogen cooling or/and mist cooling or/and water quenching cooling section;

After the reheating section, there is a furnace nose section, a zinc pot section, an air knife section, an alloying heating section, an alloying soaking section, a post-plating cooling section, and a final water-cooling section; or, through a moving channel, an over-aging section, and a final An air jet cooling section is connected to the final water cooling section;

After the final water cooling section, you can choose to set up pickling sections or (pickling section + flash plating section) in sequence; the strip can choose to go through the pickling section. To produce cold-rolled pickled products, you can also bypass the pickling section to produce cold-rolled annealed products. After pickling, the strip can also choose to enter the flash plating section to produce flash plating products such as flash nickel plating or flash zinc plating;

The radiant tube heating section burns gaseous fuels such as natural gas, liquefied petroleum gas, or coal gas, and produces high-temperature exhaust gas during the combustion process.

The preheating section of the injection radiant tube uses the heating section or/and soaking section combustion exhaust gas to exchange heat in the furnace to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. ;

The radiant tube heating section is connected in series with (parallel optional transverse magnetic induction heating section or muffle furnace section);

The jet radiation composite soaking section adopts a combination of forced convection and radiation to quickly soak the strip, improve the uniformity of the strip temperature and realize rapid adjustment of the strip soaking temperature;

The cold-rolled strip post-processing production line uses a spray radiant tube preheating section to perform rapid cooling, then reheating, and then galvanizing or over-aging treatment;

The furnace nose section is arranged in parallel with the moving channel. The strip passes backward from the furnace nose section to produce hot-dip pure zinc or alloyed hot-dip galvanizing products. The strip passes from the moving channel through the production of cold rolling, annealing, pickling or flash plating. product;

So far, the processing line has at least three or more selectable process paths, which can realize the production of five different types of high-strength steel including cold rolling annealing, pickling, flash plating, hot-dip pure zinc and alloyed hot-dip galvanizing.

Refer to Figure 148, which shows Embodiment 1 of the present invention. In Embodiment 1, an optional tensioning and straightening station and/or passivation or fingerprint resistance are also arranged between the flattening station and the exit looper station. The surface post-treatment station can perform tension straightening and/or surface post-treatment on the strip.

Refer to Figure 149, which shows Embodiment 2 of the present invention. In Embodiment 2, a balanced insulation section equipment is arranged between the reheating section and the furnace nose section, and the strip steel is subjected to insulation treatment before hot-dip galvanizing.

Refer to Figure 150, which shows Embodiment 3 of the present invention. In Embodiment 3, a mobile post-plating quick cooling section equipment is also arranged between the air knife section and the post-plating cooling section. The mobile post-plating quick cooling section is connected with the alloy The heating equipment is arranged in parallel to achieve rapid cooling of the plated strip of hot-dip pure zinc high-strength steel products; preferably, a mobile post-plated rapid cooling section equipment is set up within 10 meters above the air knife section.

Refer to Figure 151, which shows Embodiment 4 of the present invention. In Embodiment 4, a secondary reheating section equipment is arranged after the balanced heat preservation section, and the balanced heat preservation strip is reheated twice, and then hot-dip galvanized Or aging treatment.

Refer to Figure 152, which shows Embodiment 5 of the present invention. In Embodiment 5, pickling section equipment is arranged between the rapid cooling section and the reheating section. The pickling section equipment includes a pickling unit, hot water The brushing unit, hot water rinsing unit, and hot air drying unit realize pickling of the strip surface and can be used to remove the oxide layer on the surface of the strip after aerosol cooling or/and water quenching cooling. For hot-dip pure zinc or alloyed hot-dip galvanizing products, the galvanability of high-strength strip steel, especially ultra-high-strength strip steel, can also be improved.

Refer to Figure 153, which shows Embodiment 6 of the present invention. In Embodiment 6, it is preferred to arrange flash iron plating or flash nickel plating section equipment after the pickling section, and then perform reheating treatment to further improve the ultra-high strength. Platingability of strip steel.

Example 1

Preparation of a high-strength steel strip. The production line is shown in Figure 148. The main chemical composition (mass%) of the substrate is 0.08% C-0.02% Si-0.85% Mn. After uncoiling, welding, passing the entrance looper, and cleaning, It is preheated to 280℃ by the jet radiant tube preheating furnace, the radiant tube is heated to 700℃, and then heated to 800℃ by transverse magnetic induction. The jet radiation composite is soaked at 800℃ for 60 seconds, slowly cooled to 675℃, and the high hydrogen is cooled to After 260℃, it first passes through the longitudinal magnetic induction heater (reheating equipment, the longitudinal magnetic induction heater does not need to be started in this embodiment), and then enters the overaging section through the moving channel section to perform overaging treatment at around 260℃, and finally is cooled by the jet cooling equipment to about 145℃, then finally water-cooled to below 45℃, the intermediate looper passes through, and then flattening, straightening, outlet looper passing, finishing, and coiling are performed to complete production. The yield strength of the final product strip is 453MPa, the tensile strength is 512MPa, and the elongation at break is 24%.

Example 2

Preparation of a high-strength steel strip. The production line is shown in Figure 149. The main chemical composition (mass%) of the substrate is 0.085% C-0.28% Si-2.3% Mn. After uncoiling, welding, passing the entrance looper, and cleaning, It is preheated to 280℃ by the jet radiant tube preheating furnace, the radiant tube is heated to 710℃, and then heated to 810℃ by transverse magnetic induction. The jet radiation composite is soaked at 810℃ for 60 seconds, slowly cooled to 670℃, and the high hydrogen is cooled to After 460°C, it first passes through the longitudinal magnetic induction heater (reheating equipment, the longitudinal magnetic induction heater does not need to be started in this embodiment), enters the balanced insulation section to maintain balanced heat at 460°C, and then is immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After the air knife controls the weight of the coating, it passes through the alloying heating and alloying soaking sections (the equipment function is not started), and then cools to about 145°C after plating, and then is finally water-cooled to below 45°C, and the intermediate looper passes through, and then Smoothing, export looper passing, finishing and coiling complete the production. The yield strength of the final product strip is 912MPa, the tensile strength is 1093MPa, and the elongation at break is 9%.

Example 3

Preparation of a high-strength steel strip. The production line is shown in Figure 150. The main chemical composition (mass%) of the substrate is 0.080% C-0.80% Si-1.7% Mn. After uncoiling, welding, passing the entrance looper, and cleaning, The jet radiant tube preheating furnace is preheated to 275°C, and the radiant tube is heated to 845°C. After passing through the muffle furnace (in which nitrogen mixed with trace amounts of air is introduced) for surface trace pre-oxidation, the jet radiation composite homogenization is performed at 845°C. Heat for 60 seconds (nitrogen and hydrogen protective gas is introduced into the soaking section), slowly cooled to 680℃, cooled to 230℃ by high hydrogen injection, heated to 465℃ through the reheating section for balanced heat preservation, then enters the furnace nose, and then Immerse in the zinc pot for hot-dip galvanizing. After the weight of the coating is controlled by an air knife, it is quickly cooled after mobile plating. After plating, it is cooled to about 140°C. Finally, the water is cooled to room temperature. The middle looper is passed, and the outlet looper is passed after smoothing and finishing. , coiling, and completion of production. The final product has a yield strength of 765MPa, a tensile strength of 998MPa, and an elongation at break of 14.9%.

Example 4

Preparation of a high-strength steel strip. The production line is shown in Figure 151. The main chemical composition (mass%) of the substrate is 0.10% C-0.16% Si-1.90% Mn. After the strip steel is uncoiled, welded, passed through the entrance looper, and cleaned, The jet radiant tube preheating furnace is preheated to 265°C, the radiant tube is heated to 800°C, and then transverse magnetic induction is heated to 850°C, then the jet radiation composite is soaked at 850°C for 60 seconds, slowly cooled to 730°C, and then mist cooled to about 50°C, then heated to 230°C and then subjected to balanced insulation, secondary reheating (the equipment function is not enabled), moving channels and over-aging to perform 230°C over-aging treatment, and finally air-jet cooling to about 140°C and finally water cooling to room temperature. Then pickling treatment is carried out, and then flash nickel plating is carried out. The intermediate looper is passed through and then smoothed. The outlet looper is passed through, finished and coiled to complete production. The yield strength of the final product strip is 936MPa, the tensile strength is 1153MPa, and the elongation at break is 14%.

Example 5

Preparation of a high-strength steel strip. The production line is shown in Figure 152. The main chemical composition (mass%) of the substrate is 0.155% C-0.32% Si-2.63% Mn. After uncoiling, welding, passing the entrance looper, and cleaning, The jet radiant tube preheating furnace is preheated to 265°C, and the radiant tube is heated to 835°C. After passing through the muffle furnace, the jet radiation composite is soaked at 835°C for 40 seconds, slowly cooled to 755°C, water quenched to room temperature, acid Wash, heated to 230°C through the reheating section, balanced heat preservation, and then enter the over-aging section through the moving channel section for over-aging treatment at around 220°C. Finally, the air jet is cooled to around 140°C, and finally water-cooled to room temperature. The intermediate looper passes through After smoothing, the exit looper passes, is finished, and is coiled to complete production. The final product has a yield strength of 1228MPa, a tensile strength of 1501MPa, and an elongation at break of 4.1%.

Referring to Figure 154, the flexible cold-rolling post-processing production line suitable for producing a variety of ultra-high-strength strip steel according to the present invention includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - Intermediate looper-smoothing-exit looper-finishing-coiling;

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a parallel and optional transverse magnetic induction heating section or a muffle furnace section, a radiant tube soaking section, a slow cooling section, and a rapid cooling section. section, reheating section,

Starting from the reheating section, two parallel lines are set up. One line is the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section, connected to the final water cooling section; the other is a moving channel. section, over-aging section, final jet cooling section, followed by the final water cooling section;

After the final water-cooling section, a pickling section and an optional flash plating section are optionally provided;

The heating section uses gas fuel such as natural gas, liquefied petroleum gas or coal gas;

The injection radiant tube preheating section uses the radiant tube heating section or/and the radiant tube soaking section to heat the combustion exhaust gas in the furnace to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip. forced convection heat transfer;

The rapid cooling section includes high hydrogen cooling or/and gas mist cooling or/and water quenching cooling section.

The production line uses a jet radiant tube preheating section and simultaneously uses high hydrogen cooling or mist cooling or/and water quenching cooling for rapid cooling, then reheating, and then galvanizing or over-aging treatment.

Refer to Figure 154, which shows Embodiment 1 of the present invention. In Embodiment 1, an optional tensioning and straightening station and/or passivation or fingerprint-resistant surface is provided between the flattening station and the exit looper station. The post-processing station can perform tension straightening and/or surface post-treatment on the strip.

Refer to Figure 155, which shows Embodiment 2 of the present invention. In Embodiment 2, a balanced insulation section is arranged between the reheating section and the furnace nose section, and the strip steel is subjected to insulation treatment before hot-dip galvanizing.

Refer to Figure 156, which shows Embodiment 3 of the present invention. In Embodiment 3, a movable post-plating quick cooling section is also arranged between the air knife section and the post-plating cooling section. The movable post-plating quick cooling section is in conjunction with the alloying The heating sections are arranged in parallel to achieve rapid cooling of the post-plated strip of hot-dip pure zinc high-strength steel products; preferably, a mobile post-plating rapid cooling section is set up within 10 meters above the air knife section.

Refer to Figure 157, which shows Embodiment 4 of the present invention. In Embodiment 4, a secondary reheating section equipment is arranged after the balanced heat preservation section, and the balanced heat preservation strip is reheated twice, and then hot-dip galvanized Or aging treatment.

Refer to Figure 158, which shows Embodiment 5 of the present invention. In Embodiment 5, a pickling section is arranged between the high hydrogen cooling or mist cooling or/and water quenching cooling section and the reheating section. The pickling section It includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit to realize pickling of the strip surface. It can be used to remove the oxide layer on the surface of the strip after aerosol cooling or/and water quenching cooling. For hot-dip plating Pure zinc or alloyed hot-dip galvanizing products can also improve the galvanability of high-strength strip steel, especially ultra-high-strength strip steel.

Refer to Figure 159, which shows Embodiment 6 of the present invention. In Embodiment 6, the cloth is fabricated after the pickling section and before the heating section. Placing a flash-plated iron or flash-nickel plated section and then reheating it can further improve the plateability of ultra-high-strength strip steel.

Example 1

Preparation of an ultra-high-strength strip steel. The production line is shown in Figure 154. The strip steel with the main chemical composition (mass%) of the substrate being 0.095% C-0.30% Si-1.7% Mn is uncoiled, welded, and the entrance looper is passed. After cleaning, the spray radiant tube is preheated to 280°C, and the radiant tube is heated to 720°C. After the radiant tube is heated, the transverse magnetic induction heating and the muffle furnace are arranged in parallel. In this embodiment, the strip steel is heated to 820°C by transverse magnetic induction. The lower radiant tube is soaked for 60 seconds and slowly cooled to 670°C. In this embodiment, the rapid cooling section is arranged in parallel with high hydrogen cooling, mist cooling and water quenching cooling. In this embodiment, the strip steel is cooled to 230°C by high hydrogen injection and then reheated. Section (reheating does not require start-up investment) enters the over-aging section through the moving channel and undergoes over-aging treatment at 230°C. Finally, it is cooled by jet to about 145°C, and finally water-cooled to room temperature. It enters the middle looper, is flattened and straightened, and then enters the outlet. Looper, then finishing and coiling to complete production. The final product has a yield strength of 765MPa, a tensile strength of 1026MPa, and an elongation at break of 12.5%.

Example 2

Preparation of an ultra-high-strength strip steel. The production line is shown in Figure 155. The strip steel with the main chemical composition (mass%) of the substrate being 0.085% C-0.85% Si-1.8% Mn is uncoiled, welded, and the entrance looper is passed. After cleaning, the spray radiant tube is preheated to 270°C, and the radiant tube is heated to 810°C. In this embodiment, after the radiant tube is heated, the transverse magnetic induction heating and the muffle furnace are arranged in parallel. In this embodiment, the strip passes through the muffle furnace (which passes through After a small amount of surface pre-oxidation (nitrogen mixed with a trace amount of air), the radiant tube is soaked at 810°C for 50 seconds (nitrogen and hydrogen protective gas is introduced into the soaking section), and slowly cooled to 670°C. In this embodiment, the rapid cooling section is arranged in parallel. High hydrogen cooling, mist cooling and water quenching cooling. In this embodiment, the strip steel is cooled to 470°C by high hydrogen jet, enters the furnace nose through the reheating section (reheating does not require startup input) and balanced insulation, and then is immersed in a zinc pot for heating Galvanizing, after the air knife controls the coating weight, it enters the alloying soaking section (the alloying heating furnace is offline and the alloying soaking furnace is not activated). After plating, it is cooled to about 140°C, and finally water-cooled to room temperature, and then enters the intermediate activity. Set, passivation treatment is performed after smoothing, and then enters the outlet looper, followed by finishing and coiling to complete production. The final product has a yield strength of 781MPa, a tensile strength of 1015MPa, and an elongation at break of 13.6%.

Example 3

Preparation of an ultra-high-strength steel strip. The production line is shown in Figure 156. The main chemical composition (mass%) of the substrate is 0.085% C-1.5% Si-2.3% Mn. The strip steel is uncoiled, welded, and the entrance looper is passed. After cleaning, the spray radiant tube is preheated to 270°C, and the radiant tube is heated to 810°C. In this embodiment, after the radiant tube is heated, the transverse magnetic induction heating and the muffle furnace are arranged in parallel. In this embodiment, the strip steel is heated to 910°C by the transverse magnetic induction heater. , the radiant tube is heated at 910℃ for 70 seconds and slowly cooled to 675℃. In this embodiment, the rapid cooling section is arranged in parallel with high hydrogen cooling, mist cooling and water quenching cooling. In this embodiment, the strip steel is cooled to 235°C by high hydrogen injection, heated to 460°C through the reheating section, balanced and maintained at 460°C, and then passed through The furnace nose is immersed in the zinc pot for hot-dip galvanizing, and the weight of the coating is controlled by an air knife. In this embodiment, a movable post-plating quick cooling section is set within 10 meters above the air knife section. The movable post-plating quick cooling section is combined with alloying heating, The alloying is uniformly heated and arranged in parallel. In this embodiment, the strip is quickly cooled through the moving post-plating rapid cooling section, and then enters the post-plating cooling section for further cooling. Then, it is finally water-cooled to room temperature, enters the intermediate looper, and is flattened and straightened. The straightening is a powerful tension-straightening equipment that can straighten ultra-high-strength steel to improve its plate shape, then enter the outlet looper, and finally finish and coil to complete production. The final product has a yield strength of 671MPa, a tensile strength of 993MPa, and an elongation at break of 16.6%.

Example 4

Preparation of an ultra-high-strength steel strip. The production line is shown in Figure 157. The main chemical composition (mass%) of the substrate is 0.16% C-1.8% Si-2.3% Mn. The strip steel is uncoiled, welded, and the entrance looper is passed. After cleaning, the jet radiant tube is used to preheat to 269°C, and the re-radiant tube is heated to 815°C. In this embodiment, after the radiant tube is heated, the transverse magnetic induction heating and the muffle furnace are arranged in parallel. In this embodiment, the strip steel is heated to 915°C by transverse magnetic induction. The radiant tube is soaked for 80 seconds at 915°C and slowly cooled to 670°C. In this embodiment, the rapid cooling section is arranged in parallel with high hydrogen cooling, mist cooling and water quenching cooling. In this embodiment, the strip steel is cooled to 230°C by high hydrogen, and then Heated to 420°C, balanced heat preservation at 420°C, then reheated to 460°C, then immersed in the zinc pot through the furnace nose for hot-dip galvanizing, controlled by an air knife to control the weight of the coating, then entered the alloying heating section, heated to 510°C, and then heated to 505 The alloying is soaked for 20 seconds at around ℃, followed by post-plating cooling, and finally water cooling to room temperature, and then enters the intermediate looper. After flattening, it directly enters the outlet looper, followed by finishing and coiling to complete production. The yield strength of the final product strip steel is 786MPa, the tensile strength is 1055MPa, and the elongation at break is 21%.

Example 5

Preparation of an ultra-high-strength steel strip. The production line is shown in Figure 158. The main chemical composition (mass%) of the substrate is: 0.11% C-0.17% Si-1.95% Mn. The strip steel is uncoiled, welded, and the entrance looper is passed , after cleaning, the spray radiant tube is preheated to 265°C, and the radiant tube is heated to 820°C. In this embodiment, after the radiant tube is heated, the transverse magnetic induction heating and the muffle furnace are arranged in parallel. In this embodiment, the strip steel is heated to 920°C by transverse magnetic induction, and then The radiant tube is soaked for 60 seconds at 920°C and slowly cooled to 750°C. In this embodiment, the rapid cooling section is arranged in parallel with high hydrogen cooling, mist cooling and water quenching cooling. In this embodiment, the strip steel is cooled to about 50°C by mist. Then it is pickled, then reheated to 230°C, and after balanced insulation, secondary reheating (the heating function is not engaged) and moving channels, it enters the over-aging section for over-aging treatment, and finally is air-jet cooled to about 140°C and finally water-cooled to room temperature. Then carry out pickling treatment, then carry out flash nickel plating, enter the intermediate looper, then flatten, then enter the outlet looper, and finally carry out finishing and coiling to complete the production of flash nickel plating products. The final product strip steel has a yield strength of 987MPa, a tensile strength of 1199MPa, and an elongation at break of 13.1%.

Example 6

Preparation of an ultra-high-strength strip steel. The production line is shown in Figure 159. The strip steel with the main chemical composition (mass%) of the substrate being 0.15% C-0.3% Si-2.6% Mn is uncoiled, welded, and the entrance looper is passed. After cleaning, the spray radiant tube is preheated to 275°C, and the radiant tube is heated to 835°C. In this embodiment, after the radiant tube is heated, the transverse magnetic induction heating and the muffle furnace are arranged in parallel. In this embodiment, after the strip passes through the muffle furnace, it is The radiant tube is soaked for 40 seconds at 835°C and slowly cooled to 750°C. In this embodiment, the rapid cooling section is arranged in parallel with high hydrogen cooling, mist cooling and water quenching cooling. In this embodiment, the strip steel is quenched to room temperature and flashes after pickling. Nickel plating, and then heated to 235°C through the reheating section. After balanced insulation and secondary reheating (the secondary reheating function is not engaged), it enters the overaging section through the moving channel section and undergoes overaging treatment at around 230°C, and finally is jet cooled. to about 140°C, and finally water-cooled to room temperature. Then the strip enters the intermediate looper, then enters the exit looper flatly, and finally is finished and coiled to complete production. The final product has a yield strength of 1286MPa, a tensile strength of 1502MPa, and an elongation at break of 4.1%.

Referring to Figure 160, the flexible cold-rolled strip post-processing line suitable for producing a variety of high-strength steels according to the present invention includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate operation Set-flattening-export looper-finishing-coiling; among them,

The central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section or a jet radiation composite heating section, a jet radiation composite soaking section, a slow cooling section, a rapid cooling section, and a reheating section. part;

Two production lines are arranged in parallel after the reheating section. One line is equipped with the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section, and then connected to the final water cooling section; the other line Set up a moving channel section, an over-aging section and a final jet cooling section, and then connect the final water cooling section;

The final water-cooling section is followed by an optional pickling section and flash plating section;

The rapid cooling section includes high hydrogen cooling or mist cooling or/and water quenching cooling section;

The direct-fire heating section burns gaseous fuels such as natural gas or liquefied petroleum gas;

The injection direct-fire preheating section uses the direct-fired heating section combustion exhaust gas to exchange heat in the furnace to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

The transverse magnetic induction heating section or the jet radiation composite heating section is arranged in parallel or in series;

Set up an optional tensioning and straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance between the flattening station and the exit looper station;

The jet radiation composite soaking section adopts a rapid heat soaking method that combines forced convection and radiation;

Refer to Figure 161, which shows Embodiment 2 of the present invention. Embodiment 2 is based on Embodiment 1 and provides a radiant tube heating section between the jet radiation composite heating section and the jet radiation composite soaking section.

Refer to Figure 162, which shows Embodiment 3 of the present invention. Embodiment 3 is based on Embodiment 2. A balanced insulation section is provided between the reheating section and the furnace nose section, and the strip steel is subjected to insulation treatment before proceeding. Hot dip galvanized.

Refer to Figure 163, which shows Embodiment 4 of the present invention. Embodiment 4 is based on Embodiment 3, and a secondary reheating section is provided between the balanced insulation section and the furnace nose section to reheat the strip steel twice. Hot dip galvanizing is performed after heating.

Refer to Figure 164, which shows Embodiment 5 of the present invention. Embodiment 5 is based on Embodiment 4, and a movable post-plating rapid cooling section is provided between the air knife section and the post-plating cooling section. The movable post-plating rapid cooling section The cold section and the alloying heating section are arranged in parallel to achieve rapid cooling of the post-plated strip of hot-dip pure zinc high-strength steel products; preferably, a mobile post-plating rapid cooling section equipment is set up within 10 meters above the air knife section.

Refer to Figure 165, which shows Embodiment 6 of the present invention. Embodiment 6 is based on Embodiment 5, and a pickling section is provided before the reheating section. The pickling section includes a pickling unit, a hot water brushing unit, The hot water rinsing unit and hot air drying unit realize pickling of the strip surface and can be used to remove the oxide layer on the surface of the strip after aerosol cooling or/and water quenching cooling. For hot-dip pure zinc or alloyed hot-dip galvanizing products, It can also improve the plateability of high-strength strip steel, especially ultra-high-strength strip steel.

Refer to Figure 166, which shows Embodiment 7 of the present invention. Embodiment 7 is based on Embodiment 6. A flash iron or flash nickel plating section is arranged after the pickling section and before the heating section, and then reheated. Treatment can further improve the plateability of ultra-high strength strip steel.

Example 1

To produce a high-strength steel strip, the production line layout is shown in Figure 160. The main chemical composition (mass%) of the substrate is 0.09% C-0.32% Si-2.15% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, and cleaned. , preheated to 380℃ by jet direct fire, heated to 680℃ by direct fire, then heated by jet radiation composite to 800℃, soaked by jet radiation composite at 800℃ for 60 seconds, slowly cooled to 675℃, and cooled to 480 by high hydrogen ℃, first pass through the longitudinal magnetic induction heater (reheating equipment, the longitudinal magnetic induction heater does not need to be started in this embodiment), and then immerse into the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it is heated to 520°C Carry out alloying of the coating, perform alloying and soaking at 510°C for 20 seconds, and then cool it to about 145°C through the post-plating cooling equipment, then finally water-cool it to below 45°C, enter the intermediate looper, and then perform flattening and surface L treatment (one A post-treatment method for the coating surface of alloyed hot-dip galvanized products), which is finished and coiled after passing through the export looper to complete production. The yield strength of the final product strip is 692MPa, the tensile strength is 997MPa, and the elongation at break is 14%.

Example 2

To produce a high-strength steel strip, the production line layout is shown in Figure 161. The main chemical composition (mass%) of the substrate is 0.07% C-0.49% Si-2.10% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, and cleaned. , preheated by injection direct fire to 360℃, direct fire heating to 690℃, transverse magnetic induction heating to 820℃, jet radiation composite soaking at 820℃ for 60 seconds, slow cooling to 670℃, high hydrogen cooling to 230℃, first through the longitudinal magnetic induction heater ( Reheating equipment, in this embodiment the longitudinal magnetic induction heater does not need to be started), and then enters the over-aging section through the moving channel section for over-aging treatment at about 230°C, and is finally cooled to about 140°C by air jet, and then finally cooled to 45°C by water Next, it enters the intermediate looper, and then performs strong tension and straightening. After passing through the outlet looper, it is finished and coiled to complete production. The yield strength of the final product strip steel is 679MPa, the tensile strength is 1023MPa, and the elongation at break is 15%.

Example 3

To produce a high-strength steel strip, the production line layout is shown in Figure 162. The main chemical composition (mass%) of the substrate is 0.17% C-1.7% Si-2.3% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, and cleaned. , preheated to 375℃ by spray direct fire, heated to 740℃ by direct fire, heated to 850℃ by transverse magnetic induction, soaked by jet radiation composite soaking at 850℃ for 80 seconds, slowly cooled to 675℃, and cooled to 250℃ by high hydrogen. , first heated to 460°C by the longitudinal magnetic induction heater (reheating equipment), balanced and kept for 100 seconds, and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the alloying heating furnace (this In the embodiment, only the air pass passes, and the equipment does not need to be started and invested), the alloying soaking furnace (in this embodiment, only the air pass passes, and the equipment does not need to be started and invested). After plating, the cooling equipment is cooled to about 140°C, and then the final water cooling is performed. to below 45°C, enters the intermediate looper, and then performs flattening and strong straightening. After passing through the outlet looper, it is finished and coiled to complete production. The final product strip steel has a yield strength of 752MPa, a tensile strength of 1086MPa, and an elongation at break of 15%.

Example 4

To produce a high-strength steel strip, the production line layout is shown in Figure 163. The main chemical composition (mass%) of the substrate is 0.18% C-1.8% Si-2.70% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, and cleaned. , preheated to 370℃ by spray direct fire, heated to 730℃ by direct fire, heated to 845℃ by transverse magnetic induction, soaked by jet radiation composite soaking at 845℃ for 80 seconds, slowly cooled to 675℃, and cooled to 270℃ by high hydrogen. , first reheated to 410°C through the longitudinal magnetic induction heater (reheating equipment), balanced and kept for 100 seconds, then reheated to 465°C a second time, and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing, and the coating weight was controlled by an air knife After that, it enters the alloying heating furnace and is heated to 510°C, and is kept at 500°C for 20 seconds in the alloying soaking furnace. It is then cooled to about 140°C by the post-plating cooling equipment, and then finally water-cooled to below 45°C before entering the intermediate loop. Then it is flattened, passed through the outlet looper, then finished and coiled to complete production. The yield strength of the final product strip steel is 938MPa, the tensile strength is 1216MPa, and the elongation at break is 16%.

Example 5

To produce a high-strength steel strip, the production line layout is shown in Figure 165. The main chemical composition (mass%) of the substrate is 0.16% C-0.50% Si-1.70% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, and cleaned. , preheated by injection direct fire to 360°C, direct fire heating to 730°C, transverse magnetic induction heating to 830°C, then air jet composite heating to 850°C, air jet radiation compound soaking at 850°C for 60 seconds, slow cooling to 740°C, and water quenching to room temperature. , after pickling, reheat to 230℃, enter the over-aging section through the moving channel for aging treatment at around 230℃, then finally jet cooling to 130℃, and finally water cooling to below 45℃, then pickling, and enter the middle The looper is then flattened, and after passing through the outlet looper, it is finished and coiled to complete production. The yield strength of the final product strip steel is 1203MPa, the tensile strength is 1436MPa, and the elongation at break is 7%.

Example 6

To produce a high-strength steel strip, the production line layout is shown in Figure 166. The main chemical composition (mass%) of the substrate is 0.17% C-1.72% Si-2.65% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, and cleaned. , preheated to 372℃ by spray direct fire, heated to 750℃ by direct fire, heated to 850℃ by transverse magnetic induction, soaked by jet radiation composite soaking at 850℃ for 80 seconds, slowly cooled to 675℃, and cooled to 260℃ by aerosol , water is quenched to about 50℃, first pickled, then flash nickel plating, then heated to 400℃, and then balanced and maintained at 400℃ to achieve the redistribution of carbon elements in the strip and stabilize the residual austeni in the strip. The body tissue is then reheated to 460°C for a second time, and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the alloying heating furnace and is heated to 510°C, and is kept at 500°C for 18 seconds. After plating, it is cooled to below 150°C, and finally water-cooled to below 45°C. It enters the intermediate looper and then is flattened. After passing through the outlet looper, it is finished and coiled to complete production. The yield strength of the final product strip is 988MPa, the tensile strength is 1201MPa, and the elongation at break is 16%.

As the world's largest automobile production base and market, our country needs considerable high-strength steel and ultra-high-strength steel for the development of automobile lightweighting. Under this situation, the jet direct fire preheating, transverse magnetic induction heating, jet radiation composite heating and jet radiation composite soaking provided by the present invention are very suitable for the production lines of various ultra-high strength strip steels, and are also very suitable for the production of various types of steel strips. It is a kind of high-strength steel and ultra-high-strength steel, and the core process of the present invention has realized industrial application. Under the current situation of increasing market demand for ultra-high-strength steel year by year, it has very broad application prospects.

Referring to Figure 167, Embodiment 1 of the present invention, the flexible production line for producing various high-strength/ultra-high-strength steels, includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-intermediate Looper-smoothing-export looper-finishing-coiling; among them,

The transverse magnetic induction heating section and the jet radiation composite heating section are arranged in parallel or in series for rapid heating of the strip. The serial arrangement is preferred. The transverse magnetic induction heating can be selected according to the peak and valley electricity prices to reduce production costs;

The furnace nose section and the moving channel section are arranged in parallel. The strip passes backward from the furnace nose section to produce hot-dip pure zinc or alloyed hot-dip galvanizing products. The strip passes from the moving channel section to produce cold-rolled annealed or flash-plated products. ;

An optional pickling section and flash plating section are arranged after the final water-cooling section. The strip can be produced through the flash plating section to produce flash plating products such as cold-rolled flash nickel or flash zinc plating, or it can be produced by bypassing the flash plating section. Cold rolled and annealed products;

The production line uses a spray direct fire preheating section and simultaneously uses high hydrogen cooling or mist cooling or/and water quenching cooling for rapid cooling, then reheating, and then galvanizing or over-aging treatment;

Preferably, the optional pickling section equipment includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit to realize pickling of the strip surface and can be used for aerosol treatment The removal of the oxide layer on the surface of the strip after cooling or/and water quenching can also be used to improve the coating bonding strength of subsequent flash plating.

Referring to Figure 168, Embodiment 2 of the present invention, the production line is characterized in that a radiant tube heating section is arranged between the jet radiation composite heating section and the radiant tube soaking section. After the strip is heated by transverse magnetic induction heating or jet radiation composite heating, it is Radiant tube heating can be performed, and then radiant tube heating can be performed. Of course, radiant tube heating can also be performed directly after strip steel jet radiation composite heating.

Referring to Figure 169, Embodiment 3 of the present invention, the production line is characterized in that a balanced insulation section is arranged between the reheating section and the furnace nose section, and the strip steel is subjected to insulation treatment before hot-dip galvanizing.

Referring to Figure 170, Embodiment 4 of the present invention, the production line is characterized in that a movable post-plating quick cooling section is arranged between the air knife section and the post-plating cooling section, and the movable post-plating quick cooling section is connected in parallel with the alloying heating section. Arrangement to achieve rapid cooling of the plated strip of hot-dip pure zinc high-strength steel products; further preferably, a mobile post-plated rapid cooling section is set within 10 meters above the air knife section.

Referring to Figure 171, Embodiment 5 of the present invention, the production line is characterized in that the movable post-plating quick cooling section adopts a movable jet quick cooling section or/and a movable aerosol quick cooling section. When the movable jet quick cooling section equipment is arranged at the same time When moving the aerosol rapid cooling section equipment, the two sections of equipment are arranged in parallel, and one of them is selected during production to achieve rapid cooling of the plated strip.

Referring to Figure 172, Embodiment 6 of the present invention, the production line is characterized by arranging a secondary reheating section after the balanced insulation section, reheating the balanced insulation strip steel twice, and then hot-dip galvanizing or over-aging treatment. .

Referring to Figure 173, Embodiment 7 of the present invention, the production line is characterized in that a pickling section is arranged between the high hydrogen cooling or mist cooling or/and water quenching cooling section and the reheating section, and the pickling section includes pickling Unit, hot water brushing unit, hot water rinsing unit and hot air drying unit realize pickling of the strip surface, which can be used to remove the oxide layer on the surface of the strip after aerosol cooling or/and water quenching cooling. For hot-dip pure zinc or Alloyed hot-dip galvanizing products can also improve the galvanability of high-strength strip steel, especially ultra-high-strength strip steel.

Referring to Figure 174, Embodiment 8 of the present invention, the production line is characterized by arranging a flash iron or flash nickel plating section after the pickling section and before the reheating section, and then performs reheating treatment, which can further improve the ultra-high strength strip steel platingability.

Example 1

Referring to Figure 167, a kind of high-strength steel strip is prepared. The main chemical composition (mass%) of the substrate is 0.08% C-0.45% Si-2.2% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, cleaned, and sprayed directly. Preheat the fire to 350°C, heat it to 700°C with direct fire, then heat it to 820°C with transverse magnetic induction, uniformly heat with radiant tube at 820°C, then slowly cool to 690°C, cool the high hydrogen to 490°C, and then heat it with longitudinal magnetic induction (reheating equipment, the longitudinal magnetic induction heater does not need to be started in this embodiment), and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the alloying heating furnace (this embodiment only has air circulation After passing through, the equipment does not need to be started and put in), the alloying soaking furnace (in this embodiment, only air passes through, the equipment does not need to be started and put in), the cooling equipment after plating is cooled to about 140°C, and then finally water-cooled to below 45°C. It enters the middle looper and then is leveled. After passing through the outlet looper, it is finished and coiled to complete production. The final product strip steel has a yield strength of 712MPa, a tensile strength of 1039MPa, and an elongation at break of 11%.

Example 2

Referring to Figure 168, a kind of high-strength strip steel is prepared. The strip steel whose main chemical composition (mass%) of the substrate is 0.18% C-0.4% Si-1.8% Mn is uncoiled, welded, passed through the entrance looper, cleaned, and sprayed directly. Fire preheating to 260°C, direct fire heating to 630°C, then jet radiation composite heating to 750°C, then heating the radiant tube to 850°C, first slow cooling to 750°C, then mist cooling to 380°C, and then water quenching Cool to room temperature, then heat to 230°C, enter the over-aging section through the moving channel for aging treatment at 230°C, then finally spray cool to 140°C, then finally water cool to below 45°C, then pickle, flash nickel plating, enter The intermediate looper is finally leveled, and the outlet looper is finished and coiled after passing through to complete production. The yield strength of the final product strip steel is 1310MPa, the tensile strength is 1540MPa, and the elongation at break is 4%.

Example 3

Referring to Figure 169, a kind of high-strength strip steel is prepared. The strip steel whose main chemical composition (mass%) of the substrate is 0.09% C-0.3% Si-2.1% Mn is uncoiled, welded, passed through the entrance looper, cleaned, and sprayed directly. Fire preheating to 350℃, direct fire heating to 600℃, transverse magnetic induction heating to 700℃, radiant tube heating to 790℃, radiation at 790℃ The tube is uniformly heated, and then slowly cooled to 680°C. Then, after the high hydrogen is cooled to 475°C, it is first passed through the longitudinal magnetic induction heater (reheating equipment, the longitudinal magnetic induction heater does not need to be started in this embodiment), and then balanced and maintained at 475°C. Then the furnace nose is immersed in the zinc pot for hot-dip galvanizing. After the weight of the coating is controlled by the air knife, it enters the alloying heating furnace (in this embodiment, only air passes through, and the equipment does not need to be started and invested), the alloying soaking furnace (in this embodiment) Only air passes through, and the equipment does not need to be started and invested). After plating, the cooling equipment is cooled to about 140°C, and then finally water-cooled to below 45°C. It enters the intermediate looper, and then is flattened and straightened. The outlet looper is finely Shaping, coiling, and completing production. The yield strength of the final product strip is 682MPa, the tensile strength is 998MPa, and the elongation at break is 13%.

Example 4

Referring to Figure 170, a kind of high-strength steel strip is prepared. The main chemical composition (mass%) of the substrate is 0.08% C-0.45% Si-2.15% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, cleaned, and sprayed directly. Fire preheating to 350℃, direct fire heating to 650℃, jet radiation composite heating to 750℃, then radiant tube heating to 820℃, radiant tube soaking at 820℃, then slow cooling to 670℃, followed by high hydrogen cooling After reaching 320°C, it is heated to 460°C by the longitudinal magnetic induction heater. After balanced heat preservation at 460°C, it is then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the moving jet rapid cooling section. Cool to 370°C, then enter the alloying soaking furnace (in this embodiment, only air passes through, the equipment does not need to be started and invested), and then cooled to about 140°C by the post-plating cooling equipment, and then finally water-cooled to below 45°C, and then It enters the intermediate looper and then is leveled. After passing through the outlet looper, it is finished and coiled to complete production. The yield strength of the final product strip steel is 681MPa, the tensile strength is 1022MPa, and the elongation at break is 12%.

Example 5

Referring to Figure 171, a kind of high-strength strip steel is prepared. The main chemical composition (mass%) of the substrate is 0.09% C-0.32% Si-2.15% Mn. The strip steel is uncoiled, welded, passed through the entrance looper, cleaned, and sprayed directly. Preheat the fire to 353℃, then heat it with direct fire to 615℃, then heat it with transverse magnetic induction to 715℃, then heat the radiant tube to 790℃, soak the radiant tube at 790℃ for 60 seconds, then slowly cool to 675℃, and then After the high hydrogen is cooled to 470°C, it is first passed through the longitudinal magnetic induction heater (reheating equipment, the longitudinal magnetic induction heater does not need to be started in this embodiment), and is evenly maintained at 470°C, and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After the air knife controls the weight of the coating, it enters the moving gas mist rapid cooling section to quickly cool to 360°C, and then enters the alloying soaking furnace (in this embodiment, only air passes through, and the equipment does not need to be started and invested). After plating, the cooling equipment is cooled to At about 140℃, it is finally water-cooled to below 45℃, then enters the intermediate looper, and then undergoes flattening, straightening, and passivation treatment. After passing through the outlet looper, it is finished and coiled to complete production. The yield strength of the final product strip is 632MPa, the tensile strength is 938MPa, and the elongation at break is 15%.

Example 6

Referring to Figure 172, a kind of high-strength steel strip is prepared. The main chemical composition (mass%) of the substrate is 0.185% C-1.7% Si-2.7% Mn. After uncoiling, welding, passing the entrance looper, cleaning, and spraying directly Preheat the fire to 375℃, then heat it with direct fire to 700℃, then heat it with transverse magnetic induction to 800℃, then heat the radiant tube to 850℃, soak the radiant tube at 850℃ for 80 seconds, then slowly cool to 670℃, and then After the gas mist is cooled to 260°C, then heated to 400°C, the temperature is balanced and maintained at 400°C to achieve the redistribution of carbon elements in the strip, stabilize the retained austenite structure in the strip, and then reheat to 460℃, and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the alloying heating furnace and is heated to 510℃. It is kept at 500℃ in the alloying soaking furnace for 18 seconds, and then cooled after plating. The equipment is cooled to about 150°C, and then finally water-cooled to below 45°C. It enters the intermediate looper, and then undergoes flattening, straightening and surface fingerprint-resistant treatment. It enters the outlet looper, and then is finished and coiled to complete production. The yield strength of the final product strip is 986MPa, the tensile strength is 1241MPa, and the elongation at break is 14%.

Example 7

Referring to Figure 173, a kind of high-strength strip steel is prepared. The strip steel whose main chemical composition (mass%) of the substrate is 0.183% C-1.71% Si-2.75% Mn is uncoiled, welded, passed through the entrance looper, cleaned, and sprayed directly. The fire is preheated to 371℃, and the direct fire is heated to 740℃. During production, the air-fuel ratio of the direct fire is adjusted. The air-fuel ratio of the terminal direct fire heating is adjusted from the conventional 0.90 to 0.95 to achieve pre-oxidation of the strip. In the subsequent During the soaking process of the radiant tube, it will be reduced under the action of nitrogen and hydrogen protective gas to improve the plateability of the strip. Then the jet radiation is combined and heated to 810°C, and then the radiant tube is heated to 850°C. At 850°C, the radiant tube is uniformly heated. Heat for 80 seconds, slowly cool to 670°C, then cool to 260°C with mist, pickle first, then heat to 400°C, and maintain equilibrium at 400°C to achieve redistribution of carbon elements in the strip and stabilize The residual austenite structure in the strip steel is then reheated to 460°C, and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After controlling the weight of the coating with an air knife, it enters the alloying heating furnace and is heated to 510°C. It is kept at 500°C for 18 seconds, then cooled to about 150°C by the post-plating cooling equipment, and then finally water-cooled to below 45°C. It enters the intermediate looper, then is flattened and straightened, enters the outlet looper, and then finished and coiled. , complete production. The yield strength of the final product strip steel is 1012MPa, the tensile strength is 1252MPa, and the elongation at break is 14%.

Example 8

Referring to Figure 174, a kind of high-strength strip steel is prepared. The strip steel whose main chemical composition (mass%) of the substrate is 0.186% C-1.76% Si-2.77% Mn is uncoiled, welded, passed through the entrance looper, cleaned, and sprayed directly. The fire is preheated to 376℃, the direct fire is heated to 750℃, the transverse magnetic induction is heated to 850℃, then the radiant tube is heated to 900℃, the radiant tube is soaked at 900℃ for 80 seconds, slowly cooled to 670℃, and the aerosol is cooled to After room temperature, pickling is performed first, followed by flash plating, and then heated to 400°C and balanced heat preservation at 400°C to achieve the redistribution of carbon elements in the strip and stabilize the retained austenite structure in the strip. When the secondary reheating section (the secondary reheating equipment is not put into operation) enters the aging section through the moving channel, the temperature is 400°C. Aging treatment is carried out, and then the final air jet cooling is to 140°C, and then the final water cooling is below 45°C, followed by pickling, flash nickel plating, and then entering the intermediate looper, followed by smoothing, and then finishing and coiling after the outlet looper passes to complete production. . The yield strength of the final product strip steel is 1008MPa, the tensile strength is 1216MPa, and the elongation at break is 15.6%.

Refer to Figure 175, which shows Embodiment 1 of the present invention. In Embodiment 1, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in sequence: uncoiling-welding-entry looper - Cleaning - Central continuous post-processing - Smoothing - Export looper - Coiling; among them,

The central continuous post-processing station sequentially includes a jet direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, and then The heating section has two processing lines arranged in parallel from the reheating section. One section is equipped with the furnace nose section, zinc pot section, air knife section equipment, and post-plating cooling section, connected to the final water cooling section; the other section is equipped with a moving channel section and over-aging section. section, the final jet cooling section, connected to the final water cooling section;

The production line uses spray direct fire preheating to preheat the strip, and sets up transverse magnetic induction heating equipment after the direct fire heating section to quickly increase the heating temperature, and selects high hydrogen cooling for rapid cooling;

The described injection direct fire preheating section uses the direct fire heating section combustion exhaust gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then injects the nitrogen and hydrogen protective gas to the upper and lower surfaces of the strip to achieve forced convection heat exchange;

Parallel arrangement (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas The tool section + the post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products;

You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, the continuous annealing process path to produce continuously annealed products.

The movable channel section is arranged in parallel with the furnace nose section. The movable channel section can be moved to switch between online and offline positions. By cutting the strip and rethreading it, the switch between the continuous withdrawal process path and the hot-dip pure zinc process path can be achieved.

Referring to Figure 176, Embodiment 2 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; among them,

The central continuous post-processing station sequentially includes a jet direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, and then heating section;

The self-reheating section is equipped with two processing lines arranged in parallel. One line is equipped with the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section, which is connected to the final water cooling section; the other line Set up a moving channel section, an over-aging section and a final jet cooling section, followed by the final water cooling section.

In this production line, the strip steel is preheated using a spray direct-fire preheating section, and a transverse magnetic induction heating section is installed after the direct-fire heating section. The heating temperature is rapidly increased in the hot section, and high hydrogen cooling is selected for rapid cooling.

Parallel arrangement (furnace nose section + zinc pot section + air knife section equipment + alloying heating section equipment + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), with Steel can choose to go through the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, the alloyed hot-dip galvanizing process path is used to produce alloyed hot-dip products.

When the alloying heating section + alloying soaking section are not started and put into operation, the strip steel passes through the equipment in these process sections, and hot-dip pure zinc products can be produced. You can also choose to use the moving channel section + over-aging section equipment + final The jet cooling section uses the continuous annealing process path to produce continuously annealed products.

The moving channel section is connected in parallel with the furnace nose section. The moving channel section can be moved to an online position or to an offline position. By cutting the strip and re-threading it, the continuous withdrawal process path and the hot-dip galvanizing process path can be switched.

Refer to Figure 177, which shows Embodiment 3 of the present invention. In Embodiment 3, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in sequence: uncoiling-welding-entry looper - Cleaning - Central continuous post-processing - Smoothing - Export looper - Coiling; among them,

The central continuous post-processing station sequentially includes a jet direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, and then Heating section, balanced insulation section, secondary reheating section, parallel (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), and final Water cooling section.

This production line uses a spray direct fire preheating section to preheat the strip, and a transverse magnetic induction heating section is set up after the direct fire heating section to quickly increase the heating temperature. High hydrogen cooling is selected for rapid cooling, and a balanced insulation section + two The secondary reheating section can realize the secondary reheating process of high-strength steel such as QP steel.

Parallel arrangement (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas The tool section + post-plating cooling section is a hot-dip galvanizing process path to produce hot-dip pure zinc products, as shown in Example 1.

You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, use the continuous annealing process path to produce continuously annealed products, as shown in Example 2.

The moving channel section is arranged in parallel with the furnace nose section. The moving channel section can be moved to an online position or to an offline position. By cutting the strip and rethreading it, the continuous withdrawal process path and the hot-dip pure zinc process path can be realized. switch.

Referring to Figure 178, Embodiment 4 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; among them,

The central continuous post-processing station sequentially includes a jet direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, and then Heating section, balanced heat preservation section, secondary reheating section, parallel (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + Overaging section + final jet cooling section), final water cooling section.

In this production line, a spray direct-fire preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the direct-fire heating section to quickly increase the heating temperature. High hydrogen cooling is selected for rapid cooling, and a balanced insulation section is also used. + Secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel.

Set up in parallel (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can Select the furnace nose section + zinc pot section + air knife section + alloyed heating section + alloyed soaking section + post-plating cooling section, that is, the alloyed hot-dip galvanizing process path is adopted to produce alloyed hot-dip products.

When the alloying heating section and alloying soaking section are not started, the strip steel passes through the equipment in these process sections, and hot-dip pure zinc products can be produced.

You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, using the continuous annealing process path to produce continuously annealed products.

Referring to Figure 179, Embodiment 5 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; among them,

The central continuous post-processing station sequentially includes a spray direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or/ And water quenching cooling section, pickling section, reheating section, parallel (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), Final water cooling section.

In this production line, a spray direct-fire preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the direct-fired heating section to quickly increase the heating temperature, and aerosol cooling or/and water quenching cooling are set up for rapid cooling. ,

In the gas mist cooling section or/and water quenching cooling section, the strip can be cooled by gas mist or water quenching, or the strip can be cooled by gas mist first and then by water quenching, as shown in Embodiment 3.

Parallel setup (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas The tool section + the post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products.

Referring to Figure 180, Embodiment 6 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; among them,

The central continuous post-processing station sequentially includes a spray direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or/ Water quenching cooling section, pickling section, reheating section, (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel) are arranged in parallel section + over-aging section + final jet cooling section), final water cooling section.

In this production line, a spray direct-fire preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the direct-fired heating section to quickly increase the heating temperature, and aerosol cooling or/and water quenching cooling are set up for rapid cooling. .

The characteristic feature of the injection direct-fire preheating section is that the combustion exhaust gas of the direct-fire heating section is used to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange.

When the alloying heating section + alloying soaking section are not started and put into operation, the strip steel passes through the equipment in these process sections, and hot-dip pure zinc products can be produced. You can also choose to use the moving channel section + over-aging section + final jet The cooling section uses the continuous annealing process path to produce continuously annealed products.

Referring to Figure 181, Embodiment 7 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; its middle,

The central continuous post-processing station sequentially includes a spray direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or/ Water quenching cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section) are arranged in parallel + over aging section + final jet cooling section), final water cooling section.

In this production line, a spray direct-fire preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the direct-fired heating section to quickly increase the heating temperature, and aerosol cooling or/and water quenching cooling are set up for rapid cooling. , also uses the balanced insulation section + secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel.

Referring to Figure 182, Embodiment 8 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; among them,

The central continuous post-processing station sequentially includes a spray direct fire preheating section, a direct fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or/ Water quenching cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, and parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

In the aerosol cooling section or/and water quenching cooling section, the strip can be cooled by aerosol cooling, water quenching, or aerosol cooling first and then water quenching; it is also characterized by parallel ( Furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip steel can choose to move through the furnace The nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, the alloyed hot-dip galvanizing process path is used to produce alloyed hot-dip products, as shown in Example 4.

Referring to Figure 183, Embodiment 9 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiling; among which,

The central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a parallel-connected high-hydrogen cooling section. section and (aerosol cooling section or/and water quenching cooling section + pickling section), reheating section, (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section) arranged in parallel + over aging section + final jet cooling section), final water cooling section.

In this production line, a spray direct-fire preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the direct-fire heating section to quickly increase the heating temperature. A parallel high-hydrogen cooling section and (aerosol cooling section) are set up. or/and water quenching cooling section) for rapid cooling.

The parallel high-hydrogen cooling section and (gas mist cooling section or/and water quenching cooling section + pickling section), the strip steel can choose to perform high hydrogen cooling, gas mist cooling, or water quenching. For cooling, you can also choose aerosol cooling first and then water quenching cooling.

Referring to Figure 184, Embodiment 10 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; among them,

The central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a parallel-connected high-hydrogen cooling section. section and (gas mist cooling section or/and water quenching cooling section + pickling section), reheating section, and parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

A high-hydrogen cooling section and (gas mist cooling section or/and water quenching cooling section + pickling section) are set up in parallel. The strip steel can choose to carry out high hydrogen cooling, gas mist cooling, water quenching cooling, or You can choose to use aerosol cooling first and then water quenching.

Referring to Figure 185, Embodiment 11 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiling; among which,

The central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a parallel-connected high-hydrogen cooling section. Section and (gas mist cooling section or/and water quenching cooling section + pickling section), reheating section, balanced insulation section, secondary reheating section, and parallel arrangement (furnace nose section + zinc pot section + air knife section + Post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

In this production line, a spray direct-fire preheating section is used to preheat the strip, and a transverse magnetic induction is installed after the direct-fire heating section. The heating section can quickly increase the heating temperature, set up a parallel high hydrogen cooling section and (aerosol cooling section or/and water quenching cooling section) for rapid cooling, and also use a balanced insulation section + secondary reheating section to achieve QP steel Secondary reheating process of high-strength steel.

Parallel setup (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas Tool section + post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products; you can also choose to use the moving channel section + overaging section + final jet cooling section, that is, the continuous annealing process path is used to produce continuous annealing product.

Referring to Figure 186, Embodiment 12 of the present invention, the continuous unwinding or hot-dip galvanizing dual-purpose ultra-high-strength strip steel production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-smoothing- Export looper-coiler; among them,

The central continuous post-processing station sequentially includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a parallel-connected high-hydrogen cooling section. Section and (gas mist cooling section or/and water quenching cooling section + pickling section), pickling section, reheating section, balanced insulation section, secondary reheating section, (furnace nose section + zinc pot section + Air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + over-aging section + final air jet cooling section), and final water cooling section.

In this production line, a spray direct-fire preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the direct-fire heating section to quickly increase the heating temperature. A parallel high-hydrogen cooling section and (aerosol cooling section) are set up. (or/and water quenching cooling section) for rapid cooling, and also uses a balanced insulation section + secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel.

With the high hydrogen cooling section and (gas mist cooling section or/and water quenching cooling section + pickling section) set up in parallel, the strip can be cooled by high hydrogen, gas mist cooling, or water quenching cooling. You can also choose to use aerosol cooling first and then water quenching cooling.

Parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, alloying The hot-dip galvanizing process path is used to produce alloyed hot-dip products.

Preferably, a movable post-plating quick-cooling section is arranged after the air knife section. The movable post-plating quick-cooling section can move online or offline, and is arranged in parallel with the alloying heating section (designed to be movable for easy maintenance). When producing hot-dip pure zinc products, the movable post-plating quick cooling section is online to quickly cool the plated strip. At this time, the alloying heating section is offline. When producing alloyed hot-dip galvanized products, the movable post-plating quick cooling section is offline. At this time, the alloying heating section is online and the strip steel is alloyed and heated.

Preferably, a radiant tube heating section is added between the direct fire heating section and the transverse magnetic induction heating section to further increase the strip heating temperature.

Preferably, a flash nickel plating or flash iron plating section is provided after the pickling section to improve the corrosion resistance or plateability of the strip.

Preferably, an optional tensioning and straightening station and an optional passivation or fingerprint-resistant surface post-treatment station are simultaneously provided between the flattening station and the exit looper station. The strip steel can be passivated or fingerprint-resistant. Surface post-treatment before entering the outlet looper.

Example 1

An example of strip steel production. The unit layout is shown in Figure 177. The main chemical composition (mass%) of the substrate is: 0.16% C-1.8% Si-2.3% Mn strip steel uncoiling, welding, entrance looper passing, and cleaning Finally, use spray direct fire to preheat to 365℃, then direct fire heating to 750℃, then transverse magnetic induction heating to 850℃, then radiant tube soaking at 850℃ for 60 seconds, slow cooling to 675℃, high hydrogen cooling to 230℃, and then heating to 420℃. Balance the heat preservation at 420°C, then reheat to 460°C for a second time, then select the hot-dip galvanizing process path, immerse it in the zinc pot through the furnace nose for hot-dip galvanizing, control the coating weight with an air knife, and then cool to below 230°C. Then it is finally water-cooled to room temperature, flattened and then entered into the outlet looper, and finally rolled up to complete production. The yield strength of the final product strip steel is 732MPa, the tensile strength is 1068MPa, and the elongation at break is 19%.

Example 2

An example of strip steel production. The unit layout is shown in Figure 177. The main chemical composition (mass%) of the substrate is: 0.09% C-0.013% Si-0.95% Mn strip steel uncoiling, welding, entrance looper passing, and cleaning Finally, spray direct fire to preheat to 360℃, then direct fire to 750℃, then transverse magnetic induction heating to 850℃, jet radiation composite soaking at 850℃ for 60 seconds, slow cooling to 670℃, high hydrogen jet cooling to At about 230℃, after passing through the reheating section, the balanced insulation section, and the secondary reheating section (reheating and secondary reheating do not require investment), the continuous retreat process path is selected, and the aging section is entered through the moving channel at 230℃. Aging treatment, final jet cooling to about 140°C and finally water cooling to room temperature. After being flattened, it enters the outlet looper and is finally coiled to complete production. The yield strength of the final product strip is 486MPa, the tensile strength is 575MPa, and the elongation at break is 22%.

Example 3

An example of strip steel production. The unit layout is shown in Figure 179. The main chemical composition (mass%) of the substrate is: 0.12% C-0.19% Si-2.1% Mn strip steel uncoiling, welding, entrance looper passing, and cleaning Finally, spray direct fire injection to preheat to 361℃, direct fire heating to 750℃, then transverse magnetic induction heating to 850℃, then soak the radiant tube at 850℃ for 60 seconds, slowly cool to 750℃, and then aerosol cooling to 500℃, then water quenched to about 50℃, pickled, then heated to 235℃, passed through the moving channel into the over-aging section for over-aging treatment at 235℃, finally jet-cooled to about 140℃ and finally water-cooled to room temperature. Then it is flattened and then entered into the outlet looper, and finally rolled up to complete production. The yield strength of the final product strip steel is 982MPa, the tensile strength is 1208MPa, and the elongation at break is 12%.

Example 4

An example of strip steel production. The unit layout is shown in Figure 182. The main chemical composition (mass%) of the substrate is: 0.075% C-0.15% Si-1.70% Mn strip steel uncoiling, welding, entrance looper passing, and cleaning Afterwards, use direct fire to preheat to 353℃, then direct fire to 750℃, then transverse magnetic induction heating to 820℃, spray radiation compound soaking at 820℃ for 50 seconds, slow cooling to 670℃, and aerosol cooling to 500℃, water quenching and cooling to room temperature, pickling, reheating to 200℃, passing through the equalization insulation section and then reheating to 460℃, and then immersed in the zinc pot through the furnace nose for hot-dip galvanizing, and the coating weight is controlled by an air knife. Alloying is heated to 500℃, alloying is soaked at 500℃ for 18 seconds, and then cooled after plating, and then finally The water is cooled to room temperature, and after being flattened, it enters the outlet looper, and is finally rolled up to complete production. The yield strength of the final product strip is 585MPa, the tensile strength is 856MPa, and the elongation at break is 14%.

Referring to Figure 187, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line according to the present invention includes the following stations in order: uncoiling-welding-entry looper-cleaning-central continuous post-processing-flattening-exit looper-coil take; among them,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, The reheating section, the (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section) and final water cooling section are arranged in parallel.

In this production line, a jet radiant tube preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the radiant tube heating section to quickly increase the heating temperature, and high hydrogen cooling is selected for rapid cooling.

The injection radiant tube preheating section uses the combustion exhaust gas of the radiant tube heating section to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange.

Parallel setup (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas The tool section + the post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products. You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, using the continuous annealing process path to produce continuously annealed products.

The mobile channel section is connected in parallel with the furnace nose section. The mobile channel section can be moved to the online position or to the offline position. By cutting the strip steel and rethreading the strip, the continuous withdrawal process path and the hot-dip pure zinc process path can be realized. switch.

Referring to Figure 188, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations in order: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; where ,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, Reheating section, parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section) ), final water cooling section.

Set up in parallel (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can Choose furnace nose section + zinc pot section + air knife section + alloying Heating section + alloying soaking section + post-plating cooling section, that is, the alloyed hot-dip galvanizing process path is used to produce alloyed hot-dip products.

The mobile channel section is connected in parallel with the furnace nose section. The mobile channel section can be moved to the online position or to the offline position. By cutting the strip and rethreading the strip, the continuous withdrawal process path and the hot-dip galvanizing process path can be switched. .

Referring to Figure 189, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, Reheating section, balanced insulation section, secondary reheating section, (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section) arranged in parallel , the final water cooling section.

In this production line, a jet radiant tube preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the radiant tube heating section to quickly increase the heating temperature. High hydrogen cooling is selected for rapid cooling, and a balanced insulation section is also used. + Secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel.

Parallel setup (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas Tool section + post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products; you can also choose to use the moving channel section + overaging section + final jet cooling section, that is, the continuous annealing process path is used to produce continuously annealed products .

Referring to Figure 190, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, a high hydrogen cooling section, Reheating section, balanced heat preservation section, secondary reheating section, (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel) arranged in parallel section + over-aging section + final jet cooling section), final water cooling section.

Referring to Figure 191, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or /And water quenching cooling section, pickling section, reheating section, (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section) arranged in parallel ), final water cooling section.

In this production line, a spray radiant tube preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the radiant tube heating section to quickly increase the heating temperature, and aerosol cooling or/and water quenching cooling are set up for rapid cooling. .

Referring to Figure 192, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or /And water quenching cooling section, pickling section, reheating section, parallel arrangement of (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet Cooling section), final water cooling section.

Set up in parallel (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can Choose the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, follow the alloyed hot-dip galvanizing process path to produce alloyed hot-dip products; when alloying When the heating section + alloying soaking section are not started and put into operation, the strip steel passes through the equipment in these process sections to produce hot-dip pure zinc products. You can also choose to go through the moving channel section + over-aging section + final jet cooling section. That is, the continuous annealing process path is used to produce continuously annealed products.

Referring to Figure 193, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or /And water quenching cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel) arranged in parallel section + over-aging section + final jet cooling section), final water cooling section.

In this production line, a spray radiant tube preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the radiant tube heating section to quickly increase the heating temperature, and aerosol cooling or/and water quenching cooling are set up for rapid cooling. , also uses the balanced insulation section + secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel.

Parallel setup (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas Tool section + post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products; you can also choose to use the moving channel section + overaging section + final air jet cooling section, that is, the continuous retreat process Path produces continuously annealed products.

Referring to Figure 194, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, an aerosol cooling section or /And water quenching cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, and parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

Set up in parallel (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can Select the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, follow the alloyed hot-dip galvanizing process path to produce alloyed hot-dip products; when alloying When the heating section + alloying soaking section are not started and put into operation, the strip steel passes through the equipment in these process sections to produce hot-dip pure zinc products. You can also choose to go through the moving channel section + over-aging section + final jet cooling section. That is, the continuous annealing process path is used to produce continuously annealed products.

Referring to Figure 195, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a high-hydrogen system arranged in parallel. The cooling section and (aerosol cooling section or/and water quenching cooling section + pickling section), reheating section, (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel) are arranged in parallel section + over-aging section + final jet cooling section), final water cooling section.

In this production line, a jet radiant tube preheating section is used to preheat the strip, and a transverse magnet is installed after the radiant tube heating section. The induction heating section rapidly increases the heating temperature, and a parallel high hydrogen cooling section and (aerosol cooling section or/and water quenching cooling section) are set up for rapid cooling.

With the high hydrogen cooling section and (gas mist cooling section or/and water quenching cooling section + pickling section) arranged in parallel, the strip can be cooled by high hydrogen, gas mist cooling, or water. For quenching cooling, you can also choose aerosol cooling first and then water quenching cooling.

Referring to Figure 196, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station sequentially includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a parallel-connected high hydrogen The cooling section and (aerosol cooling section or/and water quenching cooling section + pickling section), reheating section, and parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

In this production line, a jet radiant tube preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the radiant tube heating section to quickly increase the heating temperature. A parallel high hydrogen cooling section and (aerosol cooling) are set up. section or/and water quenching cooling section) for rapid cooling.

Set up in parallel (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can Select the furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + post-plating cooling section, that is, follow the alloyed hot-dip galvanizing process path to produce alloyed hot-dip products; when alloying When the heating section + alloying soaking section are not started and put into operation, the strip steel will pass through the equipment in these process sections, and production can begin. For hot-dip pure zinc products, you can also choose to use the moving channel section + over-aging section + final jet cooling section, that is, the continuous annealing process path to produce continuously annealed products.

Referring to Figure 197, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station sequentially includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a parallel-connected high hydrogen The cooling section is connected in parallel with (aerosol cooling section or/and water quenching cooling section + pickling section), reheating section, balanced insulation section, secondary reheating section, and (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.

In this production line, a jet radiant tube preheating section is used to preheat the strip, and a transverse magnetic induction heating section is set up after the radiant tube heating section to quickly increase the heating temperature. A parallel high hydrogen cooling section and (aerosol cooling) are set up. section or/and water quenching cooling section) for rapid cooling, and also uses a balanced insulation section + secondary reheating section, which can realize the secondary reheating process of high-strength steel such as QP steel.

A high-hydrogen cooling section and (aerosol cooling section or/and water quenching cooling section + pickling section) are set up in parallel. The strip steel can choose to carry out high hydrogen cooling, gas mist cooling, water quenching cooling, or You can choose to use aerosol cooling first and then water quenching.

Parallel setup (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + overaging section + final jet cooling section), the strip can choose to go through the furnace nose section + zinc pot section + gas Tool section + post-plating cooling section, that is, the hot-dip galvanizing process path is used to produce hot-dip pure zinc products. You can also choose to use the moving channel section + overaging section + final jet cooling section, that is, the continuous annealing process path is used to produce continuously annealed products. .

Referring to Figure 198, the continuous unwinding or hot-dip galvanizing dual-purpose high-strength strip production line includes the following stations: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein,

The central continuous post-processing station sequentially includes a jet radiant tube preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section or a jet radiation composite soaking section, a slow cooling section, and a parallel-connected high hydrogen The cooling section is connected in parallel with (aerosol cooling section or/and water quenching cooling section + pickling section), pickling section, reheating section, balanced insulation section, secondary reheating section, and (furnace nose section + zinc pot section +air knife section+alloying heating section+alloying soaking section+post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), final water cooling section.

A high-hydrogen cooling section and (gas mist cooling section or/and water quenching cooling section + pickling section) are set up in parallel. The strip steel can choose to carry out high hydrogen cooling, gas mist cooling, water quenching cooling, or You can choose to use aerosol cooling first and then water quenching cooling.

Example 1

A kind of production of high-strength steel strip. The unit layout is shown in Figure 188. The main chemical composition (mass%) of the substrate is 0.085% C-0.16% Si-1.90% Mn. The strip steel is uncoiled, welded, the entrance looper passes, and cleaned. Finally, the jet radiant tube is preheated to 270°C, then the radiant tube is heated to 750°C, and then the transverse magnetic induction heating is performed to 830°C. The radiant tube is soaked at 830°C for 40 seconds, slowly cooled to 670°C, and cooled to 465°C with high hydrogen. , after passing through the reheating section (reheating is not put in), the alloying hot-dip galvanizing process path is followed, and the furnace nose is immersed in the zinc pot for hot-dip galvanizing. The weight of the coating is controlled by an air knife and then alloyed and heated to 515°C. The alloy is heated to 510°C. Soak and heat for 20 seconds, then perform post-plating cooling, and then finally water-cool to room temperature. After smoothing, the outlet looper passes through, and finally coiled to complete production. The yield strength of the final product strip is 582MPa, the tensile strength is 818MPa, and the elongation at break is 19%.

Example 2

Preparation of a high-strength steel strip. The unit layout is shown in Figure 189. The main chemical composition (mass%) of the substrate is 0.12% C-0.41% Si-1.90% Mn. The strip steel is uncoiled, welded, the entrance looper passes, and cleaned. Afterwards, the jet radiant tube is preheated to 280℃, the reradiant tube is heated to 710℃, then the transverse magnetic induction heating is performed to 810℃, the jet radiation composite is soaked at 810℃ for 40 seconds, slowly cooled to 670℃, the high hydrogen is cooled to 460℃, and the temperature is balanced at 460℃ ( In this embodiment, the heating functions of reheating and secondary reheating are not turned on), and then the hot-dip galvanizing process is followed and the furnace nose is immersed in the zinc pot for hot-dip galvanizing. The weight of the coating is controlled by an air knife and then cooled after plating, and then finally water-cooled to At room temperature, the outlet looper passes through after smoothing, and is finally rolled up to complete production. The yield strength of the final product strip is 346MPa, the tensile strength is 658MPa, and the elongation at break is 24%.

Example 3

Preparation of a high-strength steel strip. The unit layout is shown in Figure 190. The main chemical composition (mass%) of the substrate is 0.19% C-1.70% Si-2.60% Mn. The strip steel is uncoiled, welded, the entrance looper passes, and cleaned. Afterwards, the radiant tube is sprayed and preheated to 275°C, the radiant tube is heated to 750°C, and then heated to 850°C by transverse magnetic induction. The radiant tube is soaked at 850°C for 60 seconds, slowly cooled to 670°C, and cooled to 260°C with high hydrogen. ℃, then reheated to 420℃, balanced and maintained at 420℃ to realize the redistribution of carbon elements in the strip steel and stabilize the retained austenite structure in the strip steel, and then reheated to 465℃ for a second time for alloying The hot-dip galvanizing process path is immersed in the zinc pot through the furnace nose for hot-dip galvanizing. After the air knife controls the weight of the coating, it enters the alloying heating furnace and is heated to 510°C. It is kept at 505°C for 20 seconds in the alloying soaking furnace, and then is plated. The cooling equipment is cooled to about 140°C, and then finally water-cooled to below 45°C, and then leveled, and the outlet looper is passed through and then coiled to complete production. The yield strength of the final product strip steel is 1063MPa, the tensile strength is 1196MPa, and the elongation at break is 14%.

Example 4

A kind of production of high-strength steel strip. The unit layout is shown in Figure 191. The main chemical composition (mass%) of the substrate is 0.06% C-0.010% Si-0.95% Mn. The strip steel is uncoiled, welded, the entrance looper passes, and cleaned. Finally, the jet radiant tube is preheated to 250°C, then the radiant tube is heated to 710°C, and then the transverse magnetic induction is heated to 810°C. The jet radiation composite is soaked at 810°C for 60 seconds, slowly cooled to 675°C, and the aerosol is cooled to 500°C. °C, then water quenched to room temperature, then pickled, reheated to 230 °C, and then the continuous retreat process path entered the over-aging section through the moving channel for over-aging treatment at 230 °C, and finally air-jet cooling to about 140 °C and finally water cooling to room temperature , then leveling is carried out, and the export looper is rolled up after passing through to complete production. The final product strip steel has a yield strength of 598MPa, a tensile strength of 709MPa, and an elongation at break of 12%.

Example 5

A kind of production of high-strength steel strip. The unit layout is shown in Figure 182. The main chemical composition (mass%) of the substrate is 0.10% C-0.21% Si-2.2% Mn. The strip steel is uncoiled, welded, the entrance looper passes, and cleaned. Finally, the radiant tube is preheated to 265°C by injection, the radiant tube is heated to 830°C, and then heated to 910°C by transverse magnetic induction. Then the radiant tube is soaked at 910°C for 60 seconds, slowly cooled to 700°C, and then cooled to 700°C by water quenching. 50℃ or so, then pickling, then heating to 235℃, then taking the continuous retreat process path and entering the over-aging section through the moving channel for over-aging treatment at 235℃, and finally jet cooling to about 140℃ The machine is finally water-cooled to room temperature, flattened and passed through the outlet loop, and finally rolled up to complete production. The yield strength of the final product strip steel is 1011MPa, the tensile strength is 1299MPa, and the elongation at break is 6%.

The above-described embodiments are merely illustrative and are not intended to limit the scope of the invention. Solutions derived from the concepts of the present invention are also within the protection scope of this application.

Claims

A rapid hot-dip galvanizing strip production line, characterized in that it includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - outlet looper - smoothing - coiling; wherein,

The central continuous post-processing station includes a preheating section, a heating section, a soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced heat preservation section, a secondary reheating section, a furnace nose section, and a zinc pot. section, air knife section, post-plating cooling section and final water cooling section;

The preheating section adopts a jet direct fire preheating device or a jet radiation composite heating device;

The heating section adopts a direct fire heating section/and a radiant tube heating section;

The soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section;

Both the reheating section and the secondary reheating section use longitudinal magnetic induction heating equipment to rapidly heat the strip.
A rapid hot-dip galvanizing high-strength steel strip production line, characterized by including the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - exit looper - coiling; wherein,

The central continuous post-processing station includes a preheating section, a radiant tube heating section, a transverse magnetic induction heating section, a radiant tube soaking section, a slow cooling section, a high hydrogen cooling section, a reheating section, a balanced insulation section, and a secondary Reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section;

The preheating section adopts a jet radiation composite heating section or a jet radiation tube preheating section;

In addition to using radiant tubes to radiate and heat the strip, the jet radiation composite heating section also uses the radiant tube combustion exhaust gas to heat recycled nitrogen-hydrogen protective gas or full hydrogen gas, and then the nitrogen-hydrogen protective gas or full hydrogen gas is injected into the strip. The upper and lower surfaces realize forced convection heat transfer;

The injection radiant tube preheating section uses the radiant tube heating section and the radiant tube soaking section to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas in the furnace, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. ;

The soaking section adopts a radiant tube soaking section or a jet radiation composite heating section;

Both the reheating section and the secondary reheating section use longitudinal magnetic induction heating to rapidly heat the strip.
A rapid hot-dip galvanizing ultra-high-strength strip production line, which is characterized by:

It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a spray direct fire preheating section, Direct fire heating section, radiant tube heating section, transverse magnetic induction heating section, soaking section, slow cooling section, high hydrogen cooling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, Air knife section, post-plating cooling section and final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the jet direct fire preheating section uses the direct fire heating section combustion exhaust gas for heating and recycling nitrogen and hydrogen protective gas, and then spray the nitrogen and hydrogen protective gas onto the upper and lower surfaces of the strip to achieve forced convection heat exchange; both the reheating section and the secondary reheating section use longitudinal magnetic induction heating equipment to rapidly heat the strip; or

It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a spray direct fire preheating section, a direct Fire heating section, radiant tube heating section, transverse magnetic induction heating section, soaking section, slow cooling section, rapid cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, furnace nose section, zinc pot section, air knife section, post-plating cooling section and final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the rapid cooling section adopts an aerosol cooling section and/or water quenching cooling section; the injection direct-fire preheating section uses the direct-fire heating section to burn the exhaust gas to heat the recycled nitrogen and hydrogen protective gas, and then injects the nitrogen and hydrogen protective gas to the upper and lower surfaces of the strip to achieve forced convection heat exchange; the reheating section and In the secondary reheating section, longitudinal magnetic induction heating equipment is used to rapidly heat the strip.
A rapid annealing strip steel production line, characterized by:

It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; the central continuous post-processing station includes preheating section, heating section and soaking section in sequence. , slow cooling section, rapid cooling section, reheating section, over-aging section, final jet cooling section, final water cooling section; the preheating section adopts a jet direct fire preheating device or a jet radiation composite heating device; the heating section adopts Direct fire heating section and/or radiant tube heating section; the rapid cooling section adopts high hydrogen cooling, or mist cooling or water quenching cooling; the soaking section adopts radiant tube soaking or jet radiation composite heating device for soaking; or

It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; the central continuous post-processing station includes preheating section, heating section and radiant tube in sequence. Hot section, slow cooling section, rapid cooling section, reheating section, over-aging section, final jet cooling section, final water cooling section; the preheating section adopts a jet direct fire preheating device or a jet radiation composite heating device; the heating section The section adopts direct fire heating section and/or radiant tube heating section; the rapid cooling section adopts high hydrogen cooling and aerosol cooling or water quenching cooling arranged in parallel, or aerosol cooling and water quenching cooling are arranged in parallel and aerosol cooling and A connecting channel is provided between the water quenching cooling, or the high hydrogen cooling, the aerosol cooling, and the water quenching cooling are arranged in parallel, and a connecting channel is provided between the aerosol cooling and the water quenching cooling.
A rapid annealing high-strength steel strip production line, characterized in that it includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post The processing stations include the jet radiation composite heating section, the radiant tube heating section, the transverse magnetic induction heating section, the soaking section, the slow cooling section, the rapid cooling section, the reheating section, the over-aging section, the final jet cooling section, and the final water cooling section; The jet radiation composite heating section installs the radiant tube inside the high-speed jet air box, and quickly transfers the heat generated by the combustion gas of the radiant tube to the strip through two methods: high-speed and high-temperature jet and radiation, thereby realizing rapid heating of the strip; The rapid cooling section includes a high hydrogen cooling section or a mist cooling section or a water quenching cooling section; or the high hydrogen cooling section and the mist cooling section are arranged in parallel; or the high hydrogen cooling section and the water quenching cooling section are arranged in parallel ; Or, the aerosol cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section; or, the high hydrogen cooling section, the aerosol cooling section, the water quenching section The cooling sections are arranged in parallel, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section; the soaking section adopts radiant tube heating Thermal devices or jet radiant composite heating devices.
A rapid annealing ultra-high strength strip production line, characterized in that it includes the following stations in sequence: uncoiling-welding-entrance looper-cleaning-central continuous post-processing-flattening-exit looper-coiling; wherein, the central continuous The post-processing stations include the spray direct fire preheating section, the direct fire heating section, the radiant tube heating section, the transverse magnetic induction heating section, the soaking section, the slow cooling section, the rapid cooling section, the reheating section, the over-aging section, and the final injection Cooling section and final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the rapid cooling section adopts a high hydrogen cooling section or an aerosol cooling section or a water quenching cooling section; or, high The hydrogen cooling section is arranged in parallel with the gas mist cooling section or the water quenching cooling section; or the gas mist cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the gas mist cooling section and the water quenching cooling section; or, high The hydrogen cooling section, the gas mist cooling section, and the water quenching cooling section are arranged in parallel, and a connecting channel is provided between the gas mist cooling section and the water quenching cooling section, and the high hydrogen cooling section is connected to the reheating section.
An ultra-short process hot-dip pure zinc high-strength strip production line, characterized in that it includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - outlet looper - smoothing - coiling; wherein, The central continuous post-processing station includes a rapid heating station, a soaking station, a rapid cooling station, a surface modification station and a hot-dip pure zinc station; the rapid heating station adopts direct fire heating equipment; The heat soaking station adopts a radiant tube heat soaking device, a jet radiation composite heat soaking device, or an electric radiant tube heat soaking device, a resistance wire heat soaking device, or a resistance band heat soaking device; the rapid cooling station uses aerosol cooling equipment Or water quenching cooling equipment; the surface modification station adopts pickling equipment; the hot-dip pure zinc station is successively provided with a reheating section, a furnace nose section, a zinc pot section, an air knife section, a post-plating cooling section and a final Water cooling section.
An ultra-short flow ultra-high-strength strip steel production line, characterized in that it includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - outlet looper - coiling; wherein, the central continuous post-processing station The stations include a rapid heating station, a soaking station and a rapid cooling station in sequence; the rapid heating station adopts a jet radiation composite heating device; the soaking station uses a radiant tube heating equipment and a jet radiation composite heating device , electric radiant tube heating equipment, resistance wire heating equipment or resistance band heating equipment; the rapid cooling station adopts high hydrogen cooling equipment, aerosol cooling equipment or water quenching cooling equipment.
An ultra-short process hot-dip galvanized high-strength strip steel production line, characterized in that it includes the following stations in sequence: uncoiling-welding-entry looper-central continuous post-processing-exit looper-flattening-coiling; wherein, the central The continuous post-processing station includes a rapid heating section, a soaking section, a rapid cooling section and a hot-dip galvanizing section in sequence; the rapid heating section adopts direct fire heating; or direct fire heating and transverse magnetic induction heating are arranged in series; or direct fire Heating, jet radiation composite heating, and transverse magnetic induction heating are arranged in series; the soaking section adopts jet radiation composite soaking, electric radiant tube soaking, resistance wire soaking or resistance band soaking; the rapid cooling section uses high hydrogen cooling ; The hot-dip galvanizing section is equipped with furnace nose, zinc pot, air knife, post-plating cooling equipment and final water cooling equipment.
A flexible cold-rolled strip post-processing production line suitable for producing a variety of high-strength steels, which is characterized by including the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate looper - smoothing -exit Looper-finishing-coiling; among which,

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, an optional transverse magnetic induction heating section or a muffle furnace section arranged in parallel, a jet radiation composite soaking section, a slow cooling section, a rapid Cooling section, reheating section; the rapid cooling section includes high hydrogen cooling or/and mist cooling or/and water quenching cooling section;

After the reheating section, there is a furnace nose section, a zinc pot section, an air knife section, an alloying heating section, an alloying soaking section, a post-plating cooling section, and a final water-cooling section; or, through a moving channel, an over-aging section, and a final An air jet cooling section is connected to the final water cooling section;

After the final water-cooling section, you can choose to set up a pickling section or a pickling section + flash plating section in sequence; the strip steel can choose to go through the pickling section to produce cold-rolled and pickled products, or it can bypass the pickling section to produce cold-rolled and annealed products. After the strip is pickled, you can also choose to enter the flash plating section to produce flash plating products such as flash nickel plating or flash zinc plating;

The radiant tube heating section burns gaseous fuels such as natural gas, liquefied petroleum gas, or coal gas;

The preheating section of the injection radiant tube uses the heating section or/and soaking section combustion exhaust gas to exchange heat in the furnace to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. ;

The radiant tube heating section is connected in series with (the optional transverse magnetic induction heating section or muffle furnace section arranged in parallel);

The jet radiation composite soaking section adopts a combination of forced convection and radiation to quickly soak the strip, improve the uniformity of the strip temperature and realize rapid adjustment of the strip soaking temperature;

The cold-rolled strip post-processing production line uses a spray radiant tube preheating section to perform rapid cooling, then reheating, and then galvanizing or over-aging treatment;

The furnace nose section is arranged in parallel with the moving channel. The strip steel passes backward from the furnace nose section to produce hot-dip pure zinc or alloyed hot-dip galvanizing products. The strip steel passes through the moving channel to produce cold-rolled annealing or pickling or flash plating products. .
A flexible cold-rolling post-processing production line suitable for producing various ultra-high-strength strip steels, which is characterized in that it includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate looper - Smoothing-export looper-finishing-coiling;

The central continuous post-processing station includes a jet radiant tube preheating section, a radiant tube heating section, a parallel and optional transverse magnetic induction heating section or a muffle furnace section, a radiant tube soaking section, a slow cooling section, and a rapid cooling section. section, reheating section,

Starting from the reheating section, two parallel lines are set up. One line is the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section, connected to the final water cooling section; the other is a moving channel. section, over-aging section, final jet cooling section, followed by the final water cooling section;

After the final water-cooling section, a pickling section and an optional flash plating section are optionally provided;

The heating section uses gas fuel such as natural gas, liquefied petroleum gas or coal gas;

The preheating section of the injection radiant tube uses the heating section or/and soaking section combustion exhaust gas to exchange heat in the furnace to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange. ;

The rapid cooling section includes high hydrogen cooling or/and gas mist cooling or/and water quenching cooling section.
A flexible cold-rolled strip post-processing line suitable for producing a variety of high-strength steels, characterized by including the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - intermediate looper - smoothing - Export looper-finishing-coiling; among which,

The central continuous post-processing station includes a jet direct-fire preheating section, a direct-fire heating section, a transverse magnetic induction heating section or a jet radiation composite heating section, a jet radiation composite soaking section, a slow cooling section, a rapid cooling section, and a reheating section. part;

Two production lines are arranged in parallel after the reheating section. One line is equipped with the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section, and then connected to the final water cooling section; the other line Set up a moving channel section, an over-aging section and a final jet cooling section, and then connect the final water cooling section;

The final water-cooling section is followed by an optional pickling section and flash plating section;

The rapid cooling section includes high hydrogen cooling or mist cooling or/and water quenching cooling section;

The direct-fire heating section burns gaseous fuels such as natural gas or liquefied petroleum gas;

The injection direct-fire preheating section uses the direct-fired heating section combustion exhaust gas to exchange heat in the furnace to heat the recycled nitrogen and hydrogen protective gas, and then the nitrogen and hydrogen protective gas is sprayed onto the upper and lower surfaces of the strip to achieve forced convection heat exchange;

The transverse magnetic induction heating section or the jet radiation composite heating section is arranged in parallel or in series;

Set up an optional tensioning and straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance between the flattening station and the exit looper station;

The jet radiation composite soaking section adopts a rapid heat soaking method that combines forced convection and radiation;

So far, the production line has more than three optional process paths, which can produce five different types of high-strength steel including cold rolling annealing, pickling, flash plating, hot-dip pure zinc and alloyed hot-dip galvanizing.
A flexible production line for producing a variety of high-strength/ultra-high-strength steels, which is characterized by including the following stations in sequence: uncoiling-welding-entry looper-cleaning-central continuous post-processing-intermediate looper-smoothing-exit looper - finishing - coiling; where,

The central continuous post-processing station includes a spray direct fire preheating section, a heating section, a radiant tube soaking section, a slow cooling section, a rapid cooling section, a reheating section and two parallel processing lines, a final water cooling section and Optional pickling section and flash plating section;

One of the processing lines includes the furnace nose section, zinc pot section, air knife section, alloying heating section, alloying soaking section, and post-plating cooling section; the other processing line includes a moving channel section, an overaging section, and a final jet cooling section;

The heating section adopts a direct fire heating section, a transverse magnetic induction heating section and/or a jet radiation composite heating section;

The transverse magnetic induction heating section and the jet radiation composite heating section are arranged in parallel or in series;

The rapid cooling section includes high hydrogen cooling or mist cooling or/and water quenching cooling;

An optional tensioning and straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance are also arranged between the flattening station and the exit looper station.
A continuous retreat or hot-dip galvanizing dual-purpose ultra-high-strength strip production line, which is characterized by:

It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a spray direct fire preheating section, a direct The fire heating section, the transverse magnetic induction heating section, the soaking section, the slow cooling section, the rapid cooling section, and the reheating section; the self-reheating section has two processing lines arranged in parallel, and one line is equipped with a furnace nose section, a zinc pot section, and a gas The tool section and post-plating cooling section are connected to the final water-cooling section; the other section is provided with a moving channel section, an over-aging section, and a final jet cooling section, which are connected to the final water-cooling section; the soaking section adopts a radiant tube soaking section or a jet Radiation composite soaking section; the rapid cooling section adopts a high hydrogen cooling section, aerosol cooling section or water quenching cooling section; or

It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a spray direct fire preheating section, a direct Fire heating section, transverse magnetic induction heating section, soaking section, slow cooling section, rapid cooling section, pickling section, reheating section; the self-reheating section is equipped with two processing lines arranged in parallel, and one line is equipped with a furnace nose section, zinc The pot section, air knife section, and post-plating cooling section are connected to the final water-cooling section; the other section is provided with a moving channel section, an over-aging section, and a final jet cooling section, which are connected to the final water-cooling section; the soaking section uses radiant tubes to evenly Hot section or jet radiation composite soaking section; the rapid cooling section adopts aerosol cooling section or/and water quenching cooling section; or

It includes the following stations in sequence: uncoiling - welding - entrance looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a spray direct fire preheating section, a direct Fire heating section, transverse magnetic induction heating section, soaking section, slow cooling section, rapid cooling section, pickling section, reheating section; the self-reheating section is equipped with two processing lines arranged in parallel, and one line is equipped with a furnace nose section, zinc The pot section, air knife section, and post-plating cooling section are connected to the final water-cooling section; the other section is provided with a moving channel section, an over-aging section, and a final jet cooling section, which are connected to the final water-cooling section; the soaking section uses radiant tubes to evenly Hot section or jet radiation composite soaking section; the rapid cooling section adopts a high hydrogen cooling section, aerosol cooling section or/and water quenching cooling section, and the high hydrogen cooling section and aerosol cooling section or/and water quenching cooling The sections are arranged in parallel, and the high hydrogen cooling section is connected to the reheating section.
A continuous retreat or hot-dip galvanizing dual-purpose high-strength strip production line, which is characterized by:

It includes the following stations in sequence: uncoiling - welding - inlet looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes in sequence a spray radiant tube preheating section, a radiation Tube heating section, transverse magnetic induction heating section, soaking section, slow cooling section, rapid cooling section, reheating section, (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel) arranged in parallel section + over-aging section + final jet cooling section) and final water cooling section; the soaking section adopts a radiant tube soaking section or a jet radiation composite soaking section; the rapid cooling section includes a high hydrogen cooling section or/and aerosol cooling section or/and water quenching cooling section; or

It includes the following stations in sequence: uncoiling - welding - inlet looper - cleaning - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes in sequence a spray radiant tube preheating section, a radiation Tube heating section, transverse magnetic induction heating section, soaking section, slow cooling section, rapid cooling section, pickling section, reheating section, etc. (furnace nose) sub-section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section; the soaking section adopts a radiant tube soaking section or jet radiation Composite soaking section; the rapid cooling section includes a high hydrogen cooling section or/and an aerosol cooling section or/and a water quenching cooling section; or, the aerosol cooling section and the water quenching cooling section are arranged in parallel, and the aerosol cooling section and A connecting channel is provided between the water quenching cooling sections; or the high hydrogen cooling section is arranged in parallel with the aerosol cooling section and the water quenching cooling section, and a connecting channel is provided between the aerosol cooling section and the water quenching cooling section, and the high hydrogen cooling section Connect the reheat section.
The production line according to any one of claims 1 to 15, characterized in that:

(1) The injection direct fire preheating device includes: a direct fire furnace and a preheating furnace; wherein,

The direct-fired stove includes:

The furnace shell has a top roller chamber and a furnace bottom roller chamber respectively at its upper and lower ends; the top roller chamber and the furnace bottom roller chamber are respectively equipped with steering rollers; several direct-fire heating zones are set up along the height direction in the furnace shell. Several direct-fire burners are provided; at least two through holes are provided on the upper side wall of the furnace shell, and they are arranged symmetrically left and right;

The preheating furnace includes:

The upper side wall of the furnace body is provided with at least two connection holes, which are arranged symmetrically left and right, and are connected to the through holes in the upper part of the furnace shell of the direct furnace through communication pipes; the top of the furnace body is provided with a roller chamber corresponding to the top of the furnace , a furnace throat for strip steel to pass through; the bottom of the furnace body is equipped with a strip steel inlet and a corresponding sealing device and a steering roller; an upper partition with holes is provided in the upper part of the furnace body to form an upper gas collecting chamber for direct-fired exhaust gas; direct-fired A direct-fired combustion exhaust gas secondary combustion chamber is provided below the upper exhaust gas collection chamber, and at least one open flame burner is installed in the direct-fired combustion exhaust gas secondary combustion chamber; preferably, a combustion exhaust gas measuring chamber is also provided in the direct-fired combustion exhaust gas secondary combustion chamber. Thermometer; a lower partition with holes is provided in the lower part of the furnace body to form a direct-fire exhaust gas lower gas collecting chamber, and is connected to an exhaust gas fan through an exhaust gas discharge pipe; a control valve is provided on the exhaust gas discharge pipe;

Several heat exchange and jet air box units are arranged on both sides of the furnace body below the direct-fired combustion exhaust gas secondary combustion chamber along the height direction of the furnace body, with a belt passage for the strip to pass through; each heat exchange and jet air box unit is The bellows unit includes,

The air box body has a number of heat exchange tubes vertically arranged inside it, and a number of nozzles are arranged on one side of the air box body relative to the belt passage; an exhaust gas secondary mixing chamber connected to the heat exchange tubes is arranged between the upper and lower air box bodies. ;Put nitrogen and hydrogen protective gas into the wind box;

Circulation fan, the port of its inlet pipe is arranged in the belt passage, and the port of its outlet pipe is located in the wind box;

A number of sealing devices for the steel strip to pass through are respectively provided at the upper and lower ports of the belt passing passage and at the belt passing holes of the upper and lower partitions; preferably, the sealing device is a nitrogen sealing structure and adopts nitrogen sealing Chamber with a nitrogen injection pipeline;

(2) The jet radiant tube preheating device includes:

Radiant tube heating furnace has a furnace top roller chamber above the furnace body, and a steering roller is installed in the furnace top roller chamber;

A radiant tube exhaust gas collection chamber is connected to the radiant tube heating furnace body through a connecting pipe;

Preheating furnace, including:

The upper side wall of the preheating furnace body is provided with a connecting hole, which is connected to the radiant tube exhaust gas collection chamber through a connecting tube; the top of the preheating furnace body is provided with a corresponding and supplying roller chamber corresponding to the top roller chamber of the radiant tube heating furnace. The furnace throat that the strip passes through; the bottom of the preheating furnace body is equipped with a strip entrance, an inlet sealing device and an entrance steering roller; the upper part of the preheating furnace body is equipped with a preheating furnace gas chamber; the lower part of the preheating furnace body is equipped with a belt through The lower partition with holes forms an exhaust gas collection chamber and is connected to an exhaust gas fan through an exhaust gas discharge pipe; a control valve is provided on the exhaust gas discharge pipe;

Several heat exchange and jet air box units are arranged on both sides of the preheating furnace body below the preheating furnace gas collecting chamber along the height direction of the furnace body, with a belt passage for the strip steel to pass through; each heat exchanger and The jet air box unit includes,

The air box body has a number of heat exchange tubes vertically arranged inside it, and a number of nozzles are arranged on one side of the air box body relative to the belt passage; an exhaust gas secondary mixing chamber connected to the heat exchange tubes is arranged between the upper and lower air box bodies. ; Pour protective gas into the wind box, preferably nitrogen and hydrogen protective gas;

Circulation fan, the port of its inlet pipe is arranged in the belt passage, and the port of its outlet pipe is located in the wind box;

Sealing devices for strip steel to pass through are respectively provided at the lower port of the belt passing channel and the belt passing hole of the lower partition; preferably, the inlet sealing device and the sealing device for strip steel to pass through are The nitrogen sealing structure adopts a nitrogen sealing chamber with a nitrogen injection pipeline.

(3) The jet radiation composite heating/uniform heat device includes:

The furnace body has a composite heating body arranged along the height direction; the composite heating body includes,

The thermal insulation box has thermal insulation material on the inner wall of the shell; a mounting hole is provided in the center of one side of the thermal insulation box;

A circulation fan is installed at the installation hole of the insulation box, its air suction port corresponds to the axis of the installation hole, and the air outlet is located on the side of the casing;

The buffer cavity is arranged in the insulation box corresponding to the air suction port of the circulating fan. The back of the buffer cavity is provided with a hot air outlet corresponding to the air suction port of the circulating fan. The front of the buffer cavity is provided with a hot air inlet. Preferably, the buffer cavity is connected to the air suction port of the circulating fan. The jet air box is an integrated structure;

Two air jet air boxes are arranged vertically and symmetrically on both sides of the hot air inlet on the front of the buffer cavity in the insulation box, forming a belt passage for the strip steel to pass through; one side edge of the two air jet air boxes located on both sides of the belt passage Several rows of jet nozzles are arranged at intervals in the height direction, and a gap is set between n rows of jet nozzles, n≥1; preferably, the diameter of the jet nozzle is 1/10 to 1/5 of the distance from the jet nozzle to the strip; More preferably, the jet nozzle adopts a round hole structure;

A number of radiant tubes are symmetrically arranged in the two air jet air boxes. The radiant tubes include a connecting pipe section connected to the nozzles, a radiating tube section bent and extended from one end of the connecting pipe section, and a heat exchange tube section formed by extending and bending from one end of the radiating tube section; The radiant tube sections correspond to the gaps between n rows of jet nozzles in the air jet air box, forming an alternating structure of air jet and radiation; preferably, the radiant tube sections, connecting tube sections, and heat exchange tube sections of the radiant tube are arranged in parallel.
The production line according to claim 1, 2, 3 or 16, characterized in that the production line has any one or more of the following characteristics:

An alloying heating section and an alloying soaking section are provided between the air knife section and the post-plating cooling section; hot-dip galvanizing is alloyed hot-dip galvanizing;

The air knife section of the central continuous post-processing station is equipped with a mobile post-plating quick cooling section that can be switched online/offline. Optionally, the mobile post-plating quick cooling section is arranged side by side with the alloying heating section;

Set up a cleaning station before the entrance looper station, or set up cleaning stations before and after the entrance looper station;

A central looper is installed before the leveling station and after the central continuous post-processing station;

Set up a finishing station between the coiling station and the outlet looper station;

Set up a tensioning and straightening station between the leveling station and the exit looper station;

Set up a surface post-processing station such as passivation or fingerprint resistance between the flattening station and the exit looper station;

Set up a tensioning and straightening station and a surface post-treatment station such as passivation or fingerprint resistance at the same time between the smoothing station and the exit looper station; and

In the rapid hot-dip galvanizing ultra-high strength strip production line, a flash iron plating or flash nickel plating section is added after the pickling section.
The production line according to claim 4, 5, 6 or 16, characterized in that the production line has any one or more of the following characteristics:

An optional pickling section is provided after the final water cooling section;

An optional flash plating section is also provided after the pickling section;

A cleaning station is provided between the welding station and the entrance looper station. Preferably, cleaning stations are arranged before and after the entrance looper station;

Set up a finishing station before the coiling station;

An intermediate looping station is set before the leveling station;

Set up a tensioning and straightening station between the leveling station and the exit looper station;

Set up a surface post-processing station such as passivation or fingerprint resistance between the smoothing station and the outlet looper station, or set up a tensioning and straightening station equipment and passivation between the flattening station and the outlet looper station at the same time, or Resistant to fingerprints and other surface post-processing stations.
The production line according to any one of claims 7 and 16, characterized in that the production line has any one or more of the following characteristics:

The rapid heating station is equipped with direct fire heating equipment and transverse magnetic induction heating equipment in sequence;

In the surface modification station, optional flash iron plating or flash nickel plating equipment is also provided after the pickling section, followed by the subsequent hot-dip pure zinc station;

In the hot-dip pure zinc station, a mobile post-plating quick cooling device can optionally be installed between the air knife section and the post-plating cooling section;

The hot-dip pure zinc station is replaced with an alloyed hot-dip galvanizing station, that is, it is installed between the air knife section and the post-plating cooling section. Alloying heating section, alloying soaking section;

The hot-dip galvanizing station, after the air knife section, is equipped with an optional movable post-plating quick cooling section in parallel with the alloying heating section;

Set up a cleaning station between the welding station and the entrance looper station; or set up a cleaning station after the entrance looper station;

Set up a central looper device in front of the leveling station;

A finishing station is set up between the coiling station and the outlet looper station, and the strip is coiled after finishing;

Set up a tensioning and straightening station between the leveling station and the exit looper station;

Set up surface post-processing equipment such as passivation or fingerprint resistance between the smoothing station and the outlet looper station; or set up a tensioning and straightening station and passivation between the smoothing station and the outlet looper station at the same time or Resistant to fingerprints and other surface post-processing stations.
The production line according to any one of claims 8 and 16, characterized in that the production line has any one or more of the following characteristics:

The rapid heating station adopts a jet radiation composite heating device and a transverse magnetic induction heating device arranged in series, and the rapid cooling station adopts aerosol cooling equipment and water quenching cooling equipment arranged in series or in parallel, or high hydrogen cooling equipment and The water quenching cooling equipment is arranged in parallel, or the high hydrogen cooling equipment and the aerosol cooling equipment are arranged in parallel, or the high hydrogen cooling equipment, the aerosol cooling equipment and the water quenching cooling equipment are arranged in parallel;

Set up an optional cleaning station between the welding station and the entrance looper station;

The rapid heating station uses optional direct fire heating equipment in parallel and air jet radiation composite heating device + transverse magnetic induction heating equipment in series. The strip first passes through the direct fire heating equipment and then passes through the air jet radiation compound heating device + in series. Heating by transverse magnetic induction heating equipment, or bypassing the direct fire heating equipment and directly entering the jet radiation composite heating device + transverse magnetic induction heating equipment set in series for heating; or the rapid heating station adopts optional longitudinal magnetic induction heating equipment and series connection The air jet radiation composite heating device + transverse magnetic induction heating equipment are arranged in parallel or in series. The strip is first heated by the longitudinal magnetic induction heating equipment, or bypasses the longitudinal magnetic induction heating equipment and directly enters the air jet radiation composite heating device + transverse magnetic induction heating arranged in series. to heat;

Set up an optional cleaning station after the entrance looper station;

An optional pickling section is provided in front of the coiling station and after the central continuous post-processing station; preferably, an optional flash plating section is provided after the pickling section and before the coiling station;

Set up a leveling station in front of the coiling station;

A finishing station is set between the coiling station and the smoothing station.
The production line according to any one of claims 9 and 16, characterized in that the production line has any one or more of the following characteristics:

In the hot-dip galvanizing section, alloying heating equipment and alloying heat soaking equipment are installed between the air knife and the post-plating cooling equipment to realize the production of alloyed hot-dip galvanizing products;

In the hot-dip galvanizing section, optional mobile post-plating quick cooling equipment is provided after the air knife and in front of the post-plating cooling equipment;

Set up an optional cleaning station between the welding station and the entrance looper station; or set up an optional cleaning station after the entrance looper station;

A central looper station is set up before the leveling station and after the central continuous post-processing station;

Set up a finishing station between the coiling station and the outlet looper station;

Set up a tensioning and straightening station between the leveling station and the exit looper station;

A surface post-processing station such as passivation or fingerprint resistance is set up between the flattening station and the outlet looper station, or a tensioning and straightening station and passivation station are set up between the flattening station and the outlet looper station. In the surface post-treatment station such as fingerprint resistance, the strip can choose to undergo surface treatment such as tension straightening or/and passivation or fingerprint resistance before entering the exit looper station.
The production line according to any one of claims 10, 11 and 16, characterized in that the production line has any one or more of the following characteristics:

An optional tension-leveling station and/or surface post-treatment station such as passivation or fingerprint resistance are also arranged between the smoothing station and the exit looper station to perform tension-leveling and/or surface post-treatment on the strip;

The muffle furnace section is equipped with sealing devices at the front and rear, and the muffle furnace section is also equipped with an atmosphere adjustment device, and the hydrogen content, oxygen content and dew point in the muffle furnace section can be individually adjusted and controlled;

A balanced insulation section is also arranged between the reheating section and the furnace nose section, and the strip steel is thermally insulated before hot-dip galvanizing;

A mobile post-plating quick cooling section is also arranged between the air knife section and the post-plating cooling section. The mobile post-plating quick cooling section is arranged in parallel with the alloying heating to achieve rapid cooling of the plated strip of hot-dip pure zinc high-strength steel products; Preferably, a mobile post-plating quick cooling section is set within 10 meters above the air knife section;

Arrange a secondary reheating section after the balanced insulation section, reheat the balanced insulation strip twice, and then perform hot-dip galvanizing or over-aging treatment;

A pickling section is arranged between the rapid cooling section and the reheating section. The pickling section equipment includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit;

A flash iron or flash nickel plating section is arranged after the pickling section, and then reheated;

The moving post-plating quick cooling section adopts moving jet quick cooling or moving aerosol cooling.
The production line according to any one of claims 12 and 16, characterized in that the production line has any one or more of the following characteristics:

A radiant tube heating section is provided between the jet radiation composite heating section and the jet radiation composite soaking section;

Arrange a balanced insulation section between the reheating section and the furnace nose section;

A secondary reheating section is arranged after the equalization insulation section, and the secondary reheating section connects the moving channel section and the furnace nose section;

A movable post-plating quick cooling section is set between the air knife section and the post-plating cooling section. The movable post-plating quick cooling section is arranged in parallel with the alloying heating equipment; preferably, a movable post-plating quick cooling section is set within 10 meters above the air knife section. Post-quick cooling section;

A pickling section is provided between the rapid cooling section and the reheating section, and the pickling section includes a pickling unit, a hot water scrubbing unit, a hot water rinsing unit, and a hot air drying unit;

An iron flash plating or flash nickel plating section is provided after the pickling section and before the reheating section, and then the reheating section is connected.
The production line according to any one of claims 13 and 16, characterized in that the production line has any one or more of the following characteristics:

The optional pickling section includes a pickling unit, a hot water brushing unit, a hot water rinsing unit, and a hot air drying unit;

Radiant tube heating equipment is installed between the jet radiation composite heating section and the radiant tube soaking section;

Set up a balanced heat preservation section between the reheating section and the furnace nose section;

A mobile post-plating quick cooling section equipment is set between the air knife section and the post-plating cooling section. The mobile post-plating quick cooling section is arranged in parallel with the alloying heating section; preferably, a mobile plating section is set within 10 meters above the air knife section. Post-quick cooling section equipment;

The moving post-plating quick cooling section adopts a moving jet quick cooling section or/and a moving aerosol quick cooling section; when the moving jet quick cooling section and the moving aerosol quick cooling section are set at the same time, the moving jet quick cooling section and the moving aerosol quick cooling section The quick cooling section is arranged in parallel;

A secondary reheating section is set up after the balanced insulation section to reheat the balanced insulation strip twice and then perform hot dip galvanizing or over-aging treatment;

A pickling section is provided between the rapid cooling section and the reheating section. The pickling section includes a pickling unit, a hot water scrubbing unit, a hot water rinsing unit, and a hot air drying unit;

In the heating section, a flash iron/flash nickel plating section is provided after the pickling section and before the heating section to improve the plateability of the strip.
The production line according to any one of claims 14 and 16, characterized in that the production line has any one or more of the following characteristics:

After the reheating section, a balanced insulation section and a secondary reheating section are arranged in sequence, and the secondary reheating section is connected to the two processing lines arranged in parallel;

Hot-dip galvanizing is alloyed hot-dip galvanizing, and an alloying heating section and an alloying soaking section are provided between the air knife section and the post-plating cooling section;

A mobile post-plating quick cooling section is also arranged after the air knife section. This mobile post-plating quick cooling section can move online or offline and is arranged in parallel with the alloying heating section;

A radiant tube heating section is also added between the direct fire heating section and the transverse magnetic induction heating section;

Cleaning stations are set up before and after the entrance looper station;

Set up a finishing station before the coiling station;

An intermediate looper station is also provided before the leveling station; or an optional tensioning and straightening station is set between the leveling station and the exit looper station;

Set up an optional surface post-treatment station such as passivation or fingerprint resistance between the smoothing station and the exit looper station; or, An optional tensioning and straightening station and an optional surface post-treatment station such as passivation or fingerprint resistance are set up simultaneously between the flattening station and the exit looper station.
The production line according to any one of claims 15 and 16, characterized in that the production line has any one or more of the following characteristics:

The reheating section is followed by a balanced insulation section and a secondary reheating section. The secondary reheating section is connected to the (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving cooling section) arranged in parallel. Channel section + over-aging section + final jet cooling section).

Hot-dip galvanizing is alloyed hot-dip galvanizing, and an alloying heating section and an alloying soaking section are provided between the air knife section and the post-plating cooling section;

A movable post-plating quick cooling section is also arranged behind the air knife section, and is arranged in parallel with the alloying heating section, so that the movable post-plating quick cooling section forms an online and offline switching design;

Set up a flash nickel or flash iron section before the reheating section;

Cleaning stations are set up before and after the entrance looper station;

Set up a finishing station before the coiling station;

Set up an intermediate looper station before the leveling station;

Set up an optional tensioning and straightening station between the leveling station and the exit looper station;

Set up an optional passivation or fingerprint-resistant surface post-treatment station between the smoothing station and the outlet looper station, or set up an optional tensioning and straightening station between the flattening station and the outlet looper station at the same time equipment and optional surface post-treatment stations such as passivation or fingerprint resistance. The strip steel undergoes surface post-treatment such as passivation or fingerprint resistance before entering the exit looper.
An ultra-short process dual-purpose strip production line, which is characterized by:

It includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a transverse magnetic induction heating section and a radiant tube soaking section in sequence , gas mist cooling section or/and water quenching cooling section, pickling section, reheating section, parallel arrangement (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), final water cooling section; or

It includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a transverse magnetic induction heating section and a radiant tube soaking section in sequence , gas mist cooling section or/and water quenching cooling section, pickling section, reheating section, parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating section + alloying soaking section + after plating Cooling section) and (moving channel section + over-aging section + final jet cooling section), final water cooling section; or

It includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a transverse magnetic induction heating section and a radiant tube soaking section in sequence , aerosol cooling section or/and water quenching cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, parallel arrangement (furnace nose section + zinc pot section + air knife section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), final water cold section; or

It includes the following stations in sequence: uncoiling - welding - entrance looper - central continuous post-processing - leveling - outlet looper - coiling; wherein, the central continuous post-processing station includes a transverse magnetic induction heating section and a radiant tube soaking section in sequence , aerosol cooling section or/and water quenching cooling section, pickling section, reheating section, balanced insulation section, secondary reheating section, parallel arrangement (furnace nose section + zinc pot section + air knife section + alloying heating Section + alloying soaking section + post-plating cooling section) and (moving channel section + over-aging section + final jet cooling section), and final water cooling section.
The production line according to claim 27, characterized in that the production line has one or more of the following characteristics:

A post-plating quick cooling section that can be switched between online and offline is set up behind the air knife section and is movable in parallel with the alloying heating section;

An optional cleaning station is set up between the welding station and the entrance looper station. The strip can be cleaned through the cleaning station, or the cleaning station can be bypassed; an optional cleaning station can be set up after the entrance looper station. According to the selected cleaning station, the strip can be cleaned by the cleaning station equipment, or the cleaning station can be bypassed; or cleaning stations can be set up before and after the entrance looper station to perform secondary cleaning on the strip. cleaning;

A longitudinal magnetic induction heating section is set up before the transverse magnetic induction heating section equipment. The strip passes through the longitudinal magnetic induction heating section first. You can choose longitudinal magnetic induction heating, or you can pass through the longitudinal magnetic induction heating section and directly enter the transverse magnetic induction heating section for heating;

A flash plating iron or nickel section station is provided after the pickling section equipment;

Set up a finishing station before the coiling station;

Set up an intermediate looper station before the leveling station;

Set up a tensioning and straightening station between the leveling station and the exit looper station;

Set up a surface post-processing station such as passivation or fingerprint resistance between the flattening station and the exit looper station;

A tensioning and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are set up at the same time between the flattening station and the exit looper station.