CN117702035A - Flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steel - Google Patents
Flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steel Download PDFInfo
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- CN117702035A CN117702035A CN202211122533.8A CN202211122533A CN117702035A CN 117702035 A CN117702035 A CN 117702035A CN 202211122533 A CN202211122533 A CN 202211122533A CN 117702035 A CN117702035 A CN 117702035A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
A flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steels sequentially comprises the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, intermediate looping, flattening, outlet looping, finishing and coiling; the central continuous post-treatment station sequentially comprises 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; two production lines are arranged in parallel behind the self-reheating section, one line is provided with a furnace nose section, a zinc pot section, an air knife section, an alloying heating section, an alloying soaking section, a cooling section after plating, and the two production lines are connected with a final water cooling section; the other path is provided with a moving channel section, an overaging section and a final air-jet cooling section, and is connected with the final water-cooling section. The production line provided by the invention has more than three selectable process paths, and can realize the production of five different types of high-strength steel including cold rolling annealing, pickling, flash plating, hot dip pure zinc and alloying hot dip galvanizing.
Description
Technical Field
The invention relates to the technical field of cold rolling post-treatment of strip steel, in particular to a flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steel.
Background
The steel material is the main material for automobile production, and under the same grade strength, the high-strength steel, especially the ultra-high-strength steel, can greatly reduce the thickness of the steel plate, thereby achieving the purpose of reducing the dead weight of the automobile body, realizing energy conservation and CO reduction 2 And (5) discharging. And the high-strength steel, in particular to the ultra-high-strength steel, can meet the requirements of light weight and safety performance, and is still the first choice material for the development of the future automobile industry at present. Accordingly, the demand of the automotive industry for high-strength steel strips, particularly ultra-high-strength steel strips, including continuously annealed cold-rolled steel strips, hot-dip pure zinc steel strips (hereinafter abbreviated as GI), and galvannealed steel strips (hereinafter abbreviated as GA), has rapidly increased year by year.
Conventional strip processing lines, in addition to each looper station apparatus, typically include the following stations: uncoiling, welding, cleaning, central continuous post-treatment, flattening, finishing and coiling, wherein a withdrawal and straightening station is further arranged between a flattening station and a finishing station on some treatment lines, a post-treatment station is arranged between the flattening station and the finishing station on some treatment lines, and a withdrawal and straightening station and a post-treatment station are simultaneously arranged between the flattening station and the finishing station on other treatment lines.
The above-mentioned central continuous post-treatment station generally comprises the equipment of a general preheating section-heating section-soaking section-slow cooling section-fast cooling section-Overaging (OA) section-air-jet cooling section and final water-cooling section when producing continuously annealed cold rolled products, as shown in fig. 1. And a reheating section is arranged between the quick cooling section and the overaging section, and an acid washing section and a reheating section are simultaneously arranged between the quick cooling section and the overaging section by using other units. In the production of GI products, the central continuous post-treatment station typically comprises in sequence the equipment of a common preheating section-heating section-soaking section-slow cooling section-fast cooling section-balanced heat preservation section-furnace nose section-zinc pot section-air knife section-post-plating cooling section-final water cooling section, as shown in fig. 2. And a reheating section is arranged between the quick cooling section and the balanced heat preservation section in some GI processing lines, and an acid washing section and a reheating section are simultaneously arranged between the quick cooling section and the balanced heat preservation section in some units. Some treatment lines have a movable post-plating quench section disposed within 10 meters above the air knife between the air knife section and a stationary post-plating quench section (typically in the upper half of the APC tower). In the production of GA products, the central continuous post-treatment station typically comprises in sequence the equipment of a common preheating section-heating section-soaking section-slow cooling section-fast cooling section-balanced heat-preserving section-furnace nose section-zinc pot section-air knife section-alloying heating section-alloying soaking section-stationary post-plating cooling section and final water cooling section, as shown in fig. 3. And a reheating section is arranged between the quick cooling section and the balanced heat preservation section in some processing lines, and an acid washing section and a reheating section are simultaneously arranged between the quick cooling section and the balanced heat preservation section in some units. The movable channel section is also arranged above the air knife section, so that the switching of two or three products is realized, wherein the movable channel section (only cold-rolled product is produced), the quick cooling section (only GI product is produced) after movable plating and the alloying heating section (only GA product is produced) are arranged in parallel, and strip steel is usually cut off for product switching. And the production line for producing the GI products and the GA products adopts parallel arrangement of a quick cooling section (only the GI products are put into use) and an alloying heating section (only the GA products are put into use) after mobile plating, so that the switching of the two products is realized.
For the common preheating section and the heating section, a common mode is direct fire heating, and clean natural gas is preferably adopted for direct fire heating, so that unclean combustion waste gas is prevented from polluting the surface of the strip steel, the strip steel is directly preheated by the direct fire combustion waste gas, the temperature of the strip steel is generally lower than 750 ℃ after the direct fire heating, and the strip steel is further heated by a radiant tube and can be heated to about 850 ℃. Namely: directly preheating strip steel by using combustion waste gas of a direct-fired furnace, heating by using direct fire, heating by using a radiant tube, soaking by using the radiant tube, and the like. The prior art has the following defects:
1) The exhaust gas emission temperature of direct-fire combustion after preheating the strip steel is still relatively high, and is usually over 800 ℃, sometimes over 850 ℃, and when the exhaust gas emission temperature exceeds 850 ℃, cold air is usually doped to control the exhaust gas emission temperature to 850 ℃ or below so as to carry out secondary off-line utilization. The higher the exhaust gas temperature means more thermal energy is lost. According to the method, the primary online utilization rate of heat energy is low, and steam or hot water generated by secondary offline utilization cannot be completely consumed in the unit, so that the energy balance of the area is difficult;
2) Because the direct-fired waste gas directly contacts the strip steel and the contact time is longer, in addition, excessive fuel gas in the direct-fired waste gas needs to be subjected to secondary combustion in a preheating section, the secondary combustion flame is often an oxidizing flame, the improvement of the preheating temperature of the strip steel is necessarily limited, otherwise, an excessively thick oxide layer is easily formed on the surface of the strip steel, the surface quality problem is caused, and the preheating temperature of the strip steel can only be preheated to about 250 ℃ generally, and the preheating effect is poor;
3) The direct fire heating section has limited heating capacity and cannot be too high, the strip steel can be heated to 750 ℃ or below, the strip steel is easy to be severely oxidized after the heating temperature is further increased, and the temperature uniformity along the width direction of the strip steel is relatively poor;
4) The traditional process generally adopts a radiant tube for further heating when the strip steel is annealed at the temperature higher than 750 ℃, and because the thermal inertia of a radiant tube heating furnace is large, when the thickness specification and the annealing target temperature change greatly, the temperature of the strip steel is slowly regulated, the temperature control precision is poor, the method is very unfavorable for producing the ultra-high strength steel, or consumes excessive temperature transition materials, or causes large mass loss due to inconsistent annealing temperature;
5) The radiation tube is used for heating at the temperature above 750 ℃, particularly above 850 ℃, the heating efficiency is low, the heating speed is low, and the higher the heating temperature is, the lower the heat efficiency and the heating speed are, the lower the primary direct utilization efficiency of corresponding energy is;
6) In the radiant tube soaking section, due to the fact that the thermal inertia of the radiant tube soaking furnace is large, when the thickness specification and the annealing target temperature change greatly, the soaking temperature of the strip steel is regulated slowly, the actual soaking temperature fluctuation of the strip steel is large, and the actual performance fluctuation of high-strength steel is large when the thickness is switched or the annealing target temperature is switched, so that the performance stability of the product is insufficient.
Disclosure of Invention
The invention aims to provide a flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steels, which can be used for producing cold-rolled continuous annealing, pickling, flash plating, hot-dip pure zinc (GI) and Galvannealed (GA) ultra-high-strength strip steels, and can realize the following purposes: 1) The temperature of the strip steel can be quickly preheated to at least 350 ℃ by fully utilizing the waste heat of the waste gas of the direct-fired furnace; 2) The direct-fired combustion waste gas is prevented from directly contacting the strip steel in the preheating furnace for a long time, so that an excessively thick oxide layer is prevented from being generated on the surface of the strip steel; 3) The strip steel temperature can be quickly heated to more than 750 ℃ by utilizing quick and efficient preheating and direct fire heating, and the strip steel can be quickly and uniformly heated to more than 850 ℃ by matching with the subsequent use of transverse magnetic induction heating and jet radiation composite heating, so that quick, efficient and uniform heating is completed; 4) The rapid adjustment of the annealing temperature of the strip steel can be realized due to the remarkable reduction of the heating furnace, the reduction of the thermal inertia of the furnace and the rapid response speed of transverse magnetic induction heating; 5) The whole rapid heat treatment furnace can be remarkably simplified, miniaturized and highly-efficient, so that energy conservation and emission reduction can be realized, and the occupied area can be reduced; 6) The flexible high-strength steel special production line can flexibly produce various products such as cold rolling annealing, pickling, flash plating, hot dip pure zinc (GI), alloying hot dip Galvanizing (GA) and the like, so that the flexible production line can better meet market demands; 7) The platability of the ultra-high strength steel product can be greatly improved, so that the surface quality of the ultra-high strength hot dip product can also be obviously improved; 8) The application of the rapid heating, rapid cooling and rapid heat treatment process technology can adopt lower alloy components to produce various advanced high-strength steel products with higher strength grades, thereby not only reducing the production cost of the high-strength steel, but also improving the mechanical properties and subsequent processing properties (such as welding properties) of various super-high-strength steel products.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steels sequentially comprises the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, intermediate looping, flattening, outlet looping, finishing and coiling; wherein,
the central continuous post-treatment station sequentially comprises 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;
two production lines are arranged in parallel behind the self-reheating section, one line is provided with a furnace nose section, a zinc pot section, an air knife section, an alloying heating section, an alloying soaking section, a cooling section after plating, and the two production lines are connected with a final water cooling section; the other path is provided with a moving channel section, an overaging section and a final air-jet cooling section, and is connected with the final water-cooling section;
an optional acid washing section and a flash plating section are arranged behind the final water cooling section;
the rapid cooling section comprises a high-hydrogen cooling section or an aerosol cooling section or/and a water quenching cooling section;
the direct-fire heating section burns gas fuel such as natural gas or liquefied petroleum gas;
the injection direct-fire preheating section utilizes the combustion waste gas of the direct-fire heating section to exchange heat in the furnace to heat the recycled nitrogen-hydrogen protective gas, and then the nitrogen-hydrogen protective gas is injected to the upper surface and the lower surface of the strip steel to realize forced convection heat exchange;
The transverse magnetic induction heating section or the jet-air radiation composite heating section is arranged in parallel or in series;
an optional withdrawal straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance and the like are arranged between the flattening station and the outlet looper station;
the jet-radiation composite soaking section adopts a rapid soaking mode combining forced convection and radiation;
the production line has more than three selectable process paths, and can realize the production of five different types of high-strength steel including cold rolling annealing, acid washing, flash plating, hot plating pure zinc and alloying hot galvanizing.
Further, a radiant tube heating section is arranged between the jet-air radiation composite heating section and the jet-air radiation composite soaking section.
Furthermore, an equilibrium heat preservation section is arranged between the reheating section and the furnace nose section and is respectively connected with the moving channel section and the furnace nose section.
And a secondary reheating section is arranged after the balanced heat preservation section and is connected with the moving channel section and the furnace nose section.
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 and the alloying heating equipment are arranged in parallel; preferably, a mobile plating post-fast cooling section is arranged within a range of 10 meters above the air knife section.
Preferably, an acid washing section is arranged between the rapid cooling section and the reheating section, and comprises an acid washing unit, a hot water scrubbing unit, a hot water rinsing unit and a hot air drying unit.
Preferably, a flash iron or nickel plating section is arranged before the reheating section after the pickling section, and the reheating section is connected again.
The invention also provides a jet direct-fire preheating device, which comprises: a direct fire furnace and a preheating furnace; wherein,
the direct fire includes:
a furnace shell, the upper end and the lower end of which are respectively provided with a furnace top roller chamber and a furnace bottom roller chamber; steering rollers are respectively arranged in the furnace top roller chamber and the furnace bottom roller chamber; a plurality of direct-fire heating areas are arranged in the furnace shell along the height direction, and a plurality of direct-fire burners are arranged in the direct-fire heating areas; the side wall of the upper part of the furnace shell is provided with at least two through holes which are symmetrically arranged left and right;
the preheating furnace comprises:
the side wall of the upper part of the furnace body is provided with at least two connecting holes which are symmetrically arranged left and right and are respectively connected with the through holes on the upper part of the furnace shell of the direct-fired furnace through communicating pipes; the top end of the furnace body is provided with a furnace throat which corresponds to the furnace top roller chamber of the direct furnace and is used for the strip steel to pass through; the bottom of the furnace body is provided with a strip steel inlet, a corresponding sealing device and a corresponding steering roller; an upper partition plate with a through hole is arranged at the upper part in the furnace body to form an upper gas collection chamber of the direct-fire waste gas; a direct-fire combustion waste gas secondary combustion chamber is arranged below the upper gas collection chamber of the direct-fire waste gas, and at least one open-fire burner is arranged in the direct-fire combustion waste gas secondary combustion chamber; preferably, a combustion waste gas thermometer is further arranged in the direct-fired combustion waste gas secondary combustion chamber; a lower partition plate with a penetrating hole is arranged at the lower part in the furnace body to form a lower straight fire waste gas collecting chamber, and the lower straight fire waste gas collecting chamber is connected with a waste gas fan through a waste gas discharge pipeline; a control valve is arranged on the waste gas discharge pipeline;
The heat exchange and air injection bellows units are arranged on two sides below the direct-fired combustion waste gas secondary combustion chamber in the furnace body along the height direction of the furnace body, and a strip penetrating channel for strip steel to pass through is formed in the middle of the heat exchange and air injection bellows units; each heat exchange and air injection bellows unit comprises,
the air box body is vertically provided with a plurality of heat exchange tubes, and a plurality of nozzles are arranged on one side surface of the air box body, which is opposite to the threading channel; an exhaust gas secondary mixing chamber communicated with the heat exchange tube is arranged between the upper and lower bellows bodies; introducing nitrogen and hydrogen protective gas into the bellows body;
the port of the inlet pipeline of the circulating fan is arranged in the threading channel, and the port of the outlet pipeline of the circulating fan is positioned in the bellows body;
the sealing devices are respectively arranged at the upper and lower ports of the threading channel and the threading holes of the upper and lower partition plates; preferably, the sealing device is of a nitrogen sealing structure, a nitrogen sealing chamber is adopted, and a nitrogen injection pipeline is arranged on the sealing device.
In the production process, high-temperature combustion waste gas generated by direct fire combustion of a direct fire furnace enters a preheating furnace through a communicating pipe, a plurality of heat exchange and air injection bellows units which are sequentially arranged up and down are arranged in the preheating furnace, a heat exchange pipeline (high-temperature combustion waste gas tube side and protective gas tube side) of the heat exchange and air injection bellows units heats nitrogen-hydrogen mixed gas in the bellows body, high Wen Danqing mixed gas is blown to two sides of the strip steel through high-speed nozzles opposite to two sides of the strip steel, the strip steel is rapidly heated, the ejected high Wen Danqing mixed gas exchanges heat with low-temperature strip steel, the mixed gas is subjected to heat exchange again from circulating fans which are arranged close to two sides of the strip steel after the temperature of the mixed gas is reduced, the temperature of the nitrogen-hydrogen mixed gas is raised again, and then the nitrogen-hydrogen mixed gas is sprayed to two sides of the strip steel from the inside of the air injection bellows unit again, and the strip steel is circulated and reciprocated in this way.
In the preheating device:
the preheating device is characterized in that a heat exchange and air injection bellows unit and a direct-fire combustion waste gas secondary combustion chamber are arranged, the heat exchange and air injection bellows unit adopts a heat exchange pipeline (the heat exchanger is not arranged outside the furnace), the waste gas which is combusted again in the direct-fire combustion waste gas secondary combustion chamber heats nitrogen and hydrogen protective gas circularly utilized in the bellows, and the heated nitrogen and hydrogen protective gas is sprayed to the upper surface and the lower surface of the strip steel at a high speed under the action of a circulating fan for forced convection heat exchange, so that the strip steel is preheated rapidly and efficiently.
And an open flame burner is further arranged in the direct-fire combustion waste gas secondary combustion chamber and is used for carrying out oxygen-enriched secondary combustion on insufficiently combusted fuel gas in the direct-fire combustion waste gas secondary combustion chamber, and the burning flame cannot contact strip steel.
An exhaust gas secondary mixing chamber communicated with the heat exchange tube is arranged between the upper and lower bellows bodies, and the exhaust gas temperature is homogenized in the exhaust gas secondary mixing chamber and then enters the downstream bellows body.
The sealing device is of a nitrogen sealing structure and is provided with a nitrogen sealing chamber, a nitrogen injection pipeline opening is arranged in the nitrogen sealing chamber, sealing nitrogen is introduced into the nitrogen sealing chamber to maintain relatively high pressure, a large amount of direct-fire combustion waste gas is prevented from entering a strip penetrating channel in the furnace for heat exchange and the air injection bellows unit, and accordingly the surface of strip steel can be prevented from being excessively oxidized by the direct-fire combustion waste gas.
The strip steel inlet of the preheating furnace is provided with a sealing device, and the inside of the sealing device is also provided with a gas injection port for injecting a small amount of sealing nitrogen or air, so that the sealing device has the function of preventing the direct-fired combustion waste gas from overflowing out of the furnace.
The present invention also provides a radiant tube heating/soaking apparatus comprising:
the furnace body is internally provided with a composite heating body along the height direction; the composite heating body comprises an insulation box body, wherein an insulation material is arranged on the inner wall of the shell; a mounting hole is arranged in the center of one side surface of the heat preservation box body;
the circulating fan is arranged at the mounting hole of the heat insulation box body, the air suction inlet of the circulating fan corresponds to the axis of the mounting hole, and the air outlet is arranged on the side surface of the shell;
the buffer cavity is arranged in the insulation box body at a position corresponding to the air suction opening of the circulating fan, the back surface of the buffer cavity is provided with a hot air outlet corresponding to the air suction opening of the circulating fan, and the front surface of the buffer cavity is provided with a hot air inlet; preferably, the buffer cavity and the high-temperature air injection bellows are of an integrated structure;
the two high-temperature air jet bellows are vertically and symmetrically arranged at two sides of a hot air inlet at the front side of the buffer cavity in the heat insulation box body to form a strip penetrating channel for strip steel to pass through; a plurality of rows of jet nozzles are arranged on one side surface of the two high-temperature jet bellows at two sides of the threading channel at intervals along the height direction, and a gap is arranged between n rows of jet nozzles, wherein n is more than or equal to 1; n=1, the radiant tubes are arranged in parallel above or below the row of jet nozzles; preferably, the diameter of the jet nozzle is 1/10-1/5 of the distance from the jet nozzle to the strip steel; more preferably, the jet nozzle adopts a round hole structure;
The radiant tubes are symmetrically arranged in the two high-temperature air injection bellows and comprise a connecting tube section for connecting a burner, a radiant tube section bent and extended from one end of the connecting tube section and a heat exchange tube section formed by extending and bending from one end of the radiant tube section; the radiant tube section corresponds to gaps arranged between n rows of jet nozzles in the high-temperature jet bellows, so as to form a jet-radiation alternating structure; preferably, the radiant tube section, the connecting tube section and the heat exchange tube section of the radiant tube are arranged in parallel.
The jet-radiation composite heating/soaking device adopts a composite heating technology, can organically combine a high-speed high-temperature jet-heating technology with a radiant tube heating technology, and fully plays technical advantages of the high-speed high-temperature jet-heating technology and the radiant tube heating technology. The structure of the radiant tube is optimally designed, the radiant tube is arranged in the high-speed high-temperature jet air box, heat generated by burning gas of the radiant tube is rapidly transferred to the strip steel through two modes of high-speed high-temperature jet and radiation, the rapid heating of the strip steel is realized, the highest average heating speed of the strip steel of 1mm is not lower than 40 ℃/s, the length of a heating furnace can be greatly shortened, the heating section of a unit with 30 ten thousand tons per year output is about 2 pass, and the thermal inertia of a furnace body is reduced;
Second, heat generated by the fuel gas is transferred to the circulating gas (N 2 +H 2 ) The heat-conducting material is taken away, so that the exhaust temperature of the radiant tube can be reduced, the exhaust temperature of the radiant tube can be reduced by about 100 ℃ under the same condition, the heat efficiency of the radiant tube is improved by about 5%, the average working temperature of the radiant tube can be reduced, and the service life of the radiant tube is prolonged;
and the temperature of the heated circulating gas is uniform, so that the temperature distribution of the strip steel in the width direction in the heating process is uniform, and the temperature distribution of the strip steel in the width direction in the actual heating process is controlled to be +/-5 ℃ according to the uniformity of the strip steel in the width direction, thereby realizing the stable operation of the unit. The high-speed air injection and radiation composite heating technology can obviously improve the productivity of the existing unit and solve the problem of insufficient heating capacity on the production line.
The radiant tube of the jet-radiation composite heating/soaking device has the functions of combustion radiation (namely, a high-temperature section of the radiant tube between two rows of nozzles) and a heat exchanger, and is used for heating circulating gas, so that the heat of the combustion gas in the radiant tube can be rapidly transferred to strip steel through forced heat exchange, the rapid heating of the strip steel is realized, the length of a heating furnace can be greatly shortened, and the thermal inertia of a large vertical continuous annealing furnace body is reduced.
The flexible rapid heat treatment line of the invention differs from the traditional continuous heat treatment line in that:
1) The invention has more than three selectable process paths;
2) The invention can realize the production of five different types of high-strength steel, especially super-high-strength steel, including cold rolling annealing, acid washing, flash plating, hot plating pure zinc and alloying hot galvanizing;
3) The invention can carry out surface post-treatment such as withdrawal straightening or/and passivation or fingerprint resistance on five different types of ultra-high strength steel including cold rolling annealing, acid washing, flash plating, hot plating pure zinc and alloying hot galvanizing;
4) The invention is provided with the secondary reheating section, realizes the twice lifting of the temperature of the strip steel before hot galvanizing or overaging treatment, can realize the rapid cooling of third-generation high-strength steel (QP steel) products to lower temperature, then rapidly heats the products to higher temperature for long-time carbon redistribution treatment, and rapidly re-heats the products to the hot galvanizing zinc-entering pot temperature for the second time after the treatment is finished, and performs galvanization treatment;
5) The invention changes the common preheating section into the injection direct fire preheating section, more precisely the high-temperature nitrogen-hydrogen protective gas injection direct fire preheating section, which is one of the novelty and the creativity of the invention,
the remarkable characteristics of the preheating section are that:
(1) The method has the advantages that compared with the traditional preheating method, the heat loss of a furnace shell and a protective gas channel is obviously reduced, the waste heat utilization of combustion waste gas is more complete, the heating efficiency is higher, and the heating rate is faster;
(2) in the preheating furnace, the direct-fire combustion waste gas passes through a heat exchanger chamber of the preheating furnace, and the direct-fire combustion waste gas and the heat exchanger in the heat exchanger chamber perform sufficient heat exchange in the passing process to heat the nitrogen-hydrogen protective gas, so that the direct-fire combustion waste gas in the preheating furnace is not always in direct contact with strip steel (only in short time in a high-temperature section and the waste gas belongs to a reducing atmosphere or a micro-oxidation atmosphere), thereby avoiding the surface peroxidation of the strip steel;
(3) the insufficiently combusted fuel gas in the directly-fired waste gas is subjected to oxygen-enriched secondary combustion in a semi-sealing unit at the top of the jet preheating furnace, but the burning flame does not contact strip steel, so that the surface peroxidation of the strip steel is effectively avoided;
(4) the preheating temperature of the strip steel is higher, and the high-temperature nitrogen-hydrogen protective gas injection direct-fire preheating heat exchange coefficient is high, so that the temperature of the preheated strip steel at least reaches 350 ℃ and above, and is at least 100 ℃ higher than that of the common preheating strip steel;
(5) The temperature of the direct-fire combustion exhaust gas from the preheating furnace is usually far lower than 750 ℃ (if the number of the jet direct-fire preheating units is enough, the direct-fire combustion exhaust gas can be directly discharged below 200 ℃), and the secondary utilization of cold air outside the furnace or the secondary utilization is not needed at all. The injection direct-fire preheating device is one of important innovation points of the invention.
6) The heating section of the invention definitely uses direct fire for heating, and a transverse magnetic induction heating section is arranged behind the direct fire heating section, and a radiant tube jet-radiation composite heating section can also be arranged.
7) The use of the spray direct fire preheating section and the subsequent rapid heating section and rapid soaking section simultaneously is yet another embodiment of the novelty, creativity and practicability of the present invention.
8) The beneficial effects of the invention using the rapid heating section and the rapid soaking section are mainly as follows:
(1) the soaking temperature of the strip steel can be quickly adjusted, which is very critical to the production of high-strength steel, especially ultrahigh-strength steel, and the quality loss of the strip steel due to the out-of-standard soaking temperature can be reduced;
(2) The transverse magnetic induction heating can economically and conveniently heat the strip steel to a higher temperature, and the direct fire heating and the transverse magnetic induction heating have realized the rapid heating of the strip steel to more than 870 ℃ and realize the ultra-high temperature annealing which cannot be realized by the traditional radiant tube heating;
(3) the heated strip steel has good temperature uniformity, and the temperature uniformity along the width direction of the strip steel can be controlled within +/-5 ℃;
(4) the remarkable improvement of the heating rate can refine the grain structure to improve the strong plasticity of the material, and is particularly beneficial to the performance improvement and the cost reduction of high-strength steel and ultra-high-strength steel products.
The invention has the beneficial effects that:
1) The same production line can be used for producing continuous annealing cold rolled DP steel, MS steel, TRIP steel, QP steel, hot galvanized DP steel, MS steel, TRIP steel, QP steel and other super-high-strength steel products, and various high-strength steel products produced by adopting the rapid heat treatment process have better performance and lower cost;
2) The invention can realize the production of five different types of high-strength steel, especially super-high-strength steel, including cold rolling annealing, acid washing, flash plating, hot plating pure zinc and alloying hot galvanizing;
3) The primary utilization rate of the waste heat of the directly heated combustion waste gas is high, and the temperature of the strip steel can be preheated to at least 350 ℃;
4) The direct-fired combustion waste gas is prevented from directly contacting the strip steel in the preheating furnace for a long time, and an excessively thick oxide layer can be prevented from being generated on the surface of the strip steel;
5) The secondary ignition combustion flame of excessive fuel gas in the direct-fired waste gas can not contact the strip steel, and the generation of an excessively thick oxide layer on the surface of the strip steel can be avoided;
6) The strip steel can be economically and rapidly heated to above 870 ℃ when transverse magnetic induction heating is used, so that high-temperature annealing can be realized;
7) The temperature uniformity of the strip steel after rapid heating is good, and the temperature uniformity along the width direction of the strip steel can be controlled within +/-5 ℃;
8) The water mist cooling, acid washing or acid washing and flash plating are adopted, so that martensite ultra-high strength steel with the strength up to 1500MPa level can be produced, the surface quality and the plate shape quality are high, the platability of strip steel during hot galvanizing is good, the plating quality is excellent, and hot galvanizing tempered martensitic steel can be produced;
9) The invention can realize the pre-oxidation reduction process by adjusting the air-fuel ratio of the straight fire nozzle of the straight fire section, and the platability of the ultra-high strength steel is better.
Drawings
FIG. 1 is a schematic diagram of a station arrangement of a conventional continuous annealing production line;
FIG. 2 is a station layout of a conventional hot dip pure zinc (GI) production line;
FIG. 3 is a station layout of a conventional Galvannealed (GA) production line;
FIG. 4 is a layout of the production line of embodiment 1 of the present invention;
FIG. 5 is a layout of the production line in accordance with embodiment 2 of the present invention;
FIG. 6 is a station layout of the production line of example 3 of the present invention;
FIG. 7 is a station layout of the production line of example 4 of the present invention;
FIG. 8 is a layout of the production line of embodiment 5 of the present invention;
FIG. 9 is a layout of the production line of embodiment 6 of the present invention;
FIG. 10 is a station layout of the production line of example 7 of the present invention;
FIG. 11 is a schematic view of an embodiment of a jet direct-fire preheating device according to the present invention;
FIG. 12 is a schematic diagram of a preheating furnace in the jet direct-fired preheating device according to the present invention;
FIG. 13 is a schematic view of an embodiment of a radiant tube heating/soaking device according to the present invention in a structure 1;
FIG. 14 is a schematic view of an embodiment of a radiant tube heating/soaking device according to the present invention in FIG. 2;
FIG. 15 is a schematic structural diagram of a composite heating body in an embodiment of a radiant tube heating/soaking heating device according to the present invention;
FIG. 16 is a partial perspective view of a high temperature jet bellows in an embodiment of a radiant tube heating/soaking apparatus according to the present invention;
fig. 17 is a perspective view of a radiant tube in an embodiment of a radiant tube heating/soaking device according to the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures: it should be noted that, by applying the inventive concept, various production lines can be simplified and combined, only one embodiment is given in this example, and other embodiments are given in the present invention, even though all the group patent examples are given only in some embodiments, various combinations generated by selecting and not selecting the optional stations according to the inventive concept are within the scope of the present invention, and various production lines derived according to the inventive concept are also within the scope of the present invention. In addition, for conventional stations, such as cleaning stations comprising an alkali liquor spraying section, an alkali liquor brushing section, an electrolytic cleaning section, a hot water brushing or cold water abrasive particle roller brushing section and a hot water rinsing section, even the cleaning new technical equipment which is simplified and combined by adopting a high-pressure water jet brushing section, an ultrasonic cleaning section, a high-pressure cleaning section and the like is considered to be the production line of the invention, and the production line is also within the protection scope of the invention. As another example, finishing stations including trimming, oiling, etc., are also within the scope of the present invention.
Referring to fig. 4, the post-treatment line for the flexible cold-rolled steel strip suitable for producing various high-strength steels comprises the following stations in sequence: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, intermediate looping, flattening, outlet looping, finishing and coiling; wherein,
The central continuous post-treatment station sequentially comprises 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;
two production lines are arranged in parallel behind the self-reheating section, one line is provided with a furnace nose section, a zinc pot section, an air knife section, an alloying heating section, an alloying soaking section, a cooling section after plating, and the two production lines are connected with a final water cooling section; the other path is provided with a moving channel section, an overaging section and a final air-jet cooling section, and is connected with the final water-cooling section;
an optional acid washing section and a flash plating section are arranged behind the final water cooling section;
the rapid cooling section comprises a high-hydrogen cooling section or an aerosol cooling section or/and a water quenching cooling section;
the direct-fire heating section burns gas fuel such as natural gas or liquefied petroleum gas;
the injection direct-fire preheating section utilizes the combustion waste gas of the direct-fire heating section to exchange heat in the furnace to heat the recycled nitrogen-hydrogen protective gas, and then the nitrogen-hydrogen protective gas is injected to the upper surface and the lower surface of the strip steel to realize forced convection heat exchange;
the transverse magnetic induction heating section or the jet-air radiation composite heating section is arranged in parallel or in series;
an optional withdrawal straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance and the like are arranged between the flattening station and the outlet looper station;
The jet-radiation composite soaking section adopts a rapid soaking mode combining forced convection and radiation;
the production line has more than three selectable process paths, and can realize the production of five different types of high-strength steel including cold rolling annealing, acid washing, flash plating, hot plating pure zinc and alloying hot galvanizing.
Referring to fig. 5, an embodiment 2 of the present invention is shown, wherein a radiant tube heating section is arranged between a jet radiant composite heating section and a jet radiant composite soaking section on the basis of embodiment 1 in embodiment 2.
Referring to fig. 6, an embodiment 3 of the present invention is shown, wherein an equalizing heat-preserving section is arranged between the reheating section and the furnace nose section based on the embodiment 2, and the equalizing heat-preserving section is respectively connected with the moving channel section and the furnace nose section; and carrying out heat preservation treatment on the strip steel, and then carrying out hot galvanizing.
Referring to fig. 7, an embodiment 4 of the present invention is shown, wherein, in the embodiment 4, on the basis of the embodiment 3, a secondary reheating section is arranged between the balanced heat-preserving section and the furnace nose section, and the secondary reheating section is connected with the moving channel section and the furnace nose section; and (5) carrying out secondary reheating on the strip steel and then carrying out hot galvanizing.
Referring to fig. 8, an embodiment 5 of the present invention is shown, wherein, on the basis of the embodiment 4, a mobile post-plating quick cooling section is arranged between the air knife section and the post-plating cooling section, and the mobile post-plating quick cooling section and the alloying heating section are arranged in parallel to realize quick cooling of the strip steel after plating of the hot-dip pure zinc high-strength steel product; preferably, the device of the quick cooling section after mobile plating is arranged within the range of 10 meters above the air knife section.
Referring to fig. 9, an embodiment 6 of the present invention is shown, wherein an acid washing section is arranged before a reheating section based on an embodiment 5, and the acid washing section comprises an acid washing unit, a hot water brushing unit, a hot water rinsing unit and a hot air drying unit, so that the acid washing of the surface of the strip steel is realized, the acid washing section can be used for removing an oxide layer on the surface of the strip steel after aerosol cooling or/and water quenching cooling, and the platability of the hot-dip galvanized pure zinc or alloyed hot dip galvanized product can be improved.
Referring to fig. 10, in embodiment 7 of the present invention, in embodiment 7, on the basis of embodiment 6, a flash iron plating or flash nickel plating stage is arranged before a reheating stage after an acid washing stage, and then reheating treatment is performed, so that the platability of the ultra-high strength steel strip can be further improved.
Referring to fig. 11 and 12, the injection direct-fire preheating device according to the present invention includes: a direct burner 1 and a preheating furnace 2; wherein,
the direct burner 1 comprises:
a furnace shell 11, the upper and lower ends of which 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'; a plurality of direct-fire heating areas 111 are arranged in the furnace shell 11 along the height direction, and a plurality of direct-fire burners 13 are arranged in the direct-fire heating areas 111; the side wall of the upper part of the furnace shell 11 is provided with two through holes which are symmetrically arranged left and right;
The preheating furnace 2 includes:
the furnace body 21 is provided with two connecting holes on the side wall of the upper part, is symmetrically arranged left and right, and is respectively connected with the through holes on the upper part of the furnace shell 11 of the direct-fired furnace 1 through the communicating pipe 22; the top end of the furnace body 21 is provided with a furnace throat 211 which corresponds to the furnace top roller chamber 101 of the direct furnace 1 and is used for the strip steel to pass through; the bottom of the furnace body 21 is provided with a strip steel inlet and a corresponding sealing device 212 and a steering roller 23; an upper partition plate 213 with a through hole is arranged at the upper part in the furnace body 21 to form a direct-fire waste gas upper gas collection chamber 201; a direct-fire combustion waste gas secondary combustion chamber 202 is arranged below the direct-fire waste gas upper gas collection chamber 201, and at least one open-fire burner 24 is arranged in the direct-fire combustion waste gas secondary combustion chamber 202; a lower partition plate 214 with a penetrating hole is arranged at the lower part in the furnace body 21 to form a lower straight fire waste gas collecting chamber 203, and is connected with a waste gas fan 25 through a waste gas discharge pipeline 215 to be discharged from a chimney 500;
a plurality of heat exchange and air injection bellows units 26 which are arranged at two sides below the direct-fire combustion waste gas secondary combustion chamber 202 in the furnace body 21 along the height direction of the furnace body 21, and a penetrating channel 204 for the strip steel to pass through is formed in the middle; each heat exchange and air injection bellows unit 26 includes,
a bellows body 261, in which a plurality of heat exchange tubes 262 are vertically arranged, and a plurality of nozzles 263 are arranged on one side surface of the bellows body 261 opposite to the threading channel 204; an exhaust gas secondary mixing chamber 205 communicated with the heat exchange tube 262 is arranged between the upper and lower bellows bodies 261; introducing nitrogen and hydrogen protective gas into the bellows 261;
A circulating fan 264, the inlet of which is arranged in the threading channel 204, and the outlet of which is arranged in the bellows 261;
a plurality of sealing devices 27, 27', 27″ for the strip steel to pass through are respectively arranged at the upper and lower ports of the strip passing channel 204 and at the strip passing holes of the upper and lower partition plates 213, 214.
Preferably, a combustion exhaust gas thermometer 28 is also disposed in the direct-fired combustion exhaust gas secondary combustion chamber 202.
Preferably, the sealing devices 27, 27', 27″ are nitrogen sealing structures, and nitrogen sealing chambers are adopted, on which nitrogen injection pipelines are arranged.
Preferably, a control valve 216 is provided on the exhaust gas discharge pipe 215.
The strip steel 100 is turned to upwards run by a turning roll in front of the direct fire furnace, enters the preheating furnace 2 for preheating after being sealed by a preheating furnace inlet sealing device, then enters a furnace top roll chamber of the direct fire furnace 1 for direct fire heating after being turned by the turning roll, then enters a furnace bottom roll chamber of the direct fire furnace 1 for continuous running after being turned by the turning roll.
The temperature of the waste gas is reduced after the nitrogen-hydrogen protective gas is heated by the direct-fire combustion waste gas through the heat exchange pipeline (the nitrogen-hydrogen protective gas is blown to the upper surface and the lower surface of the strip steel to preheat the strip steel under the action of the circulating fan), and the nitrogen-hydrogen protective gas after the temperature reduction is sucked into the bellows by the circulating fan 264 on the two sides of the working side (WS side) and the driving side (DS side) of the preheating furnace to exchange heat with the heat exchange pipeline; the direct-fired combustion exhaust gas sequentially passes through the heat exchange and air injection bellows unit from top to bottom, is sucked by the (variable frequency) exhaust gas fan 25, passes through the exhaust gas discharge pipeline 215, passes through the waste heat boiler 400 to carry out secondary utilization of the waste heat of the combustion exhaust gas, and then enters the chimney 500 to be finally discharged.
Referring to fig. 13 to 17, the jet-radiation composite heating/soaking device according to the present invention includes:
a furnace body 4 in which a composite heating body 5 is arranged in the height direction; the composite heating body 5 comprises a metal sheet and a metal sheet,
a heat-insulating box 51, the inner wall of which is provided with a heat-insulating material; a mounting hole is arranged in the center of one side surface of the heat preservation box body 51;
the circulating fan 52 is arranged at the mounting hole of the heat insulation box body 51, the air suction inlet 521 of the circulating fan corresponds to the axis of the mounting hole, and the air outlet 522 is arranged on the side surface of the casing;
the buffer cavity 53 is arranged in the insulation box 51 at a position corresponding to the air suction opening of the circulating fan 52, the back surface of the buffer cavity 53 is provided with a hot air outlet corresponding to the air suction opening of the circulating fan 52, and the front surface of the buffer cavity is provided with a hot air inlet;
the two high-temperature air jet bellows 54, 54' are vertically and symmetrically arranged at two sides of the hot air inlet at the front side of the buffer cavity 53 in the heat insulation box body 51 to form a strip penetrating channel 200 for the strip 100 to penetrate through; a plurality of rows of jet nozzles 55, 55 'are arranged on one side surface of the two high-temperature jet bellows 54, 54' positioned on two sides of the threading channel 100 at intervals along the height direction, and a gap 300 is arranged between n rows of jet nozzles, wherein n is more than or equal to 1;
the plurality of radiant tubes 56, 56 'are symmetrically arranged in the two high-temperature jet bellows 54, 54', and the radiant tubes 56 (radiant tubes 56 are exemplified by the same below) comprise a connecting tube section 561 for connecting with a burner, a radiant tube section 562 which is bent and extended from one end of the connecting tube section 561, and a heat exchange tube section 563 which is formed by extending and bending from one end of the radiant tube section 562; the radiant tube sections 562 correspond to the gaps 300 provided between the n rows of jet nozzles in the high temperature jet bellows 54 to form an alternating jet and radiant configuration.
Preferably, the buffer cavity and the high-temperature air injection bellows are of an integrated structure.
Preferably, the diameter of the jet nozzle is 1/10-1/5 of the distance from the jet nozzle to the strip steel.
Preferably, the jet nozzle adopts a round hole structure.
Preferably, the radiant tube adopts a space four-stroke structure to form four sections of tube sections which are arranged in parallel, wherein one of the tube sections is a radiant tube section, and the rest is a connecting tube section and a heat exchange tube section.
Example 1
A high-strength strip steel is produced, the arrangement of a production line is shown in figure 4, the strip steel with the main chemical composition (mass%) of 0.09 percent C-0.32 percent Si-2.15 percent Mn is uncoiled, welded, passed through an inlet looper, cleaned, preheated to 380 ℃ by spraying direct fire, heated to 680 ℃ by direct fire, then heated to 800 ℃ by spraying radiation in a combined mode, soaked for 60 seconds by spraying radiation in a combined mode, slowly cooled to 675 ℃ and cooled to 480 ℃, passed through a longitudinal magnetic induction heater (a reheating device, the longitudinal magnetic induction heater of the embodiment is not required to be started), immersed into a zinc pot through a furnace nose for hot dip galvanizing, heated to 520 ℃ for coating alloying at 510 ℃ for 20 seconds by an air knife, cooled to 145 ℃ by a cooling device after plating, finally cooled to 45 ℃ by water, then fed into an intermediate looper, and subjected to leveling and surface L treatment (a surface treatment method of an alloyed hot dip galvanized product coating), passed through the outlet looper, coiled, and finished. The final product band steel has the yield strength of 692MPa, the tensile strength of 997MPa and the breaking elongation of 14 percent.
Example 2
A high-strength strip steel is produced, the arrangement of a production line is shown in figure 4, the strip steel with the main chemical composition (mass%) of 0.07 percent C-0.49 percent Si-2.10 percent Mn is uncoiled, welded, passed through an inlet loop and cleaned, then preheated to 360 ℃ by jet straight fire, heated to 690 ℃ by straight fire, heated to 820 ℃ by transverse magnetic induction, subjected to air jet radiation composite soaking for 60 seconds at 820 ℃, slowly cooled to 670 ℃ and cooled to 230 ℃, firstly passed through a longitudinal magnetic induction heater (a reheating device, the longitudinal magnetic induction heater of the embodiment is not required to be started), then passed through a moving channel section to enter an overaging section to perform overaging treatment at about 230 ℃, finally cooled to about 140 ℃ by air jet, then passed through a final water cooling to below 45 ℃, then subjected to powerful tension straightening, passed through an outlet loop and coiled, and finished production is completed. The final product band steel has the yield strength of 679MPa, the tensile strength of 1023MPa and the elongation at break of 15 percent.
Example 3
A high-strength strip steel is produced, the arrangement of a production line is as shown in figure 6, the strip steel with the main chemical composition (mass%) of 0.17 percent C-1.7 percent Si-2.3 percent Mn is uncoiled, welded, passed through an inlet loop and cleaned, then preheated to 375 ℃ by spraying straight fire, heated to 740 ℃ by straight fire, heated to 850 ℃ by transverse magnetic induction, subjected to air injection radiation composite soaking for 80 seconds at 850 ℃, slowly cooled to 675 ℃, cooled to 250 ℃, reheated to 460 ℃ by a longitudinal magnetic induction heater (reheating device), uniformly insulated for 100 seconds, immersed into a zinc pot through a furnace nose for hot galvanizing, passed through an air knife to control the plating weight, fed into an alloying heating furnace (the embodiment only passes through air, the equipment does not need to start to be started), cooled to about 140 ℃ by a cooling device, finally cooled to 45 ℃ by water, fed into an intermediate loop, subjected to powerful straightening, passed through an outlet loop, passed through and finished, coiled, and finished. The yield strength of the final product strip steel is 752MPa, the tensile strength is 1086MPa, and the breaking elongation is 15%.
Example 4
A high-strength strip steel is produced, the arrangement of a production line is shown in figure 7, the strip steel with the main chemical composition (mass%) of 0.18 percent of C-1.8 percent of Si-2.70 percent of Mn is uncoiled, welded, passed through an inlet loop and cleaned, then preheated to 370 ℃ by spraying direct fire, heated to 730 ℃ by direct fire, heated to 845 ℃ by transverse magnetic induction, subjected to air-jet radiation composite soaking for 80 seconds at 845 ℃, slowly cooled to 675 ℃, cooled to 270 ℃, firstly reheated to 410 ℃ by a longitudinal magnetic induction heater (reheating device), balanced heat-preserved for 100 seconds, then reheated to 465 ℃, immersed into a zinc pot through a furnace nose for hot galvanizing, heated to 510 ℃ by an air knife, heat-preserved for 20 seconds at 500 ℃ by an alloying soaking furnace, cooled to about 140 ℃ by a cooling device after plating, finally cooled to below 45 ℃, passed through an intermediate loop, then subjected to finishing and coiled to finish production. The final product band steel has the yield strength of 938MPa, the tensile strength of 1216MPa and the breaking elongation of 16 percent.
Example 5
A high-strength strip steel is produced, the arrangement of a production line is shown in figure 9, the strip steel with the main chemical composition (mass%) of 0.16 percent C-0.50 percent Si-1.70 percent Mn is uncoiled, welded, passed through an inlet loop and cleaned, then is preheated to 360 ℃ by spraying direct fire, is heated to 730 ℃ by transverse magnetic induction, is heated to 850 ℃ by air injection and radiation, is subjected to composite soaking and heat preservation for 60 seconds at 850 ℃, is slowly cooled to 740 ℃, is cooled to room temperature by water quenching, is subjected to pickling, is heated to 230 ℃ again, enters an overaging section through a moving channel to perform ageing treatment at about 230 ℃, is finally cooled to 130 ℃ by air injection, is finally cooled to below 45 ℃ by water, is subjected to pickling, enters an intermediate loop, is flattened, is passed through an outlet loop, and is finished and coiled to finish production. The yield strength of the final product strip steel is 1203MPa, the tensile strength is 1436MPa, and the breaking elongation is 7%.
Example 6
A high-strength strip steel is produced, the arrangement of a production line is shown in figure 10, the main chemical composition (mass%) of a substrate is 0.17 percent C-1.72 percent Si-2.65 percent Mn, the strip steel is uncoiled, welded, the strip steel is subjected to entrance looper passing and cleaning, then is preheated to 372 ℃ by spraying direct fire, is heated to 750 ℃ by heating by transverse magnetic induction, is heated to 850 ℃, is subjected to air jet radiation composite soaking for 80 seconds at 850 ℃, is slowly cooled to 675 ℃, is cooled to 260 ℃ by air mist, is subjected to water quenching to about 50 ℃, is subjected to pickling, is subjected to nickel flash plating, is heated to 400 ℃, is subjected to balanced heat preservation at 400 ℃, realizes redistribution of carbon elements in the strip steel, stabilizes the residual austenite structure in the strip steel, is subjected to secondary reheating to 460 ℃, is immersed into a zinc pot through a furnace nose for hot galvanizing, is subjected to air knife control, is heated to an alloying heating furnace to 510 ℃, is subjected to heat preservation for 18 seconds at 500 ℃, is cooled to 150 ℃, is finally cooled to 45 ℃ by final water cooling, is subjected to intermediate looper passing, is subjected to leveling, and is finished after exit looper passing, and coiling is finished. The yield strength of the final product strip steel is 988MPa, the tensile strength is 1201MPa, and the breaking elongation is 16%.
The jet direct fire preheating, transverse magnetic induction heating, jet radiation composite heating and jet radiation composite soaking provided by the invention are very suitable for production lines for producing various ultra-high strength band steels, are also very suitable for producing various high strength steels and ultra-high strength steels, and the core process of the invention has realized industrial application, and has very wide application prospect under the situation that the demands of the current ultra-high strength steel market are increased year by year.
Claims (9)
1. A flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steels is characterized by sequentially comprising the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, intermediate looping, flattening, outlet looping, finishing and coiling; wherein,
the central continuous post-treatment station sequentially comprises 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;
two production lines are arranged in parallel behind the self-reheating section, one line is provided with a furnace nose section, a zinc pot section, an air knife section, an alloying heating section, an alloying soaking section, a cooling section after plating, and the two production lines are connected with a final water cooling section; the other path is provided with a moving channel section, an overaging section and a final air-jet cooling section, and is connected with the final water-cooling section;
an optional acid washing section and a flash plating section are arranged behind the final water cooling section;
the rapid cooling section comprises a high-hydrogen cooling section or an aerosol cooling section or/and a water quenching cooling section;
the direct-fire heating section burns gas fuel such as natural gas or liquefied petroleum gas;
the injection direct-fire preheating section utilizes the combustion waste gas of the direct-fire heating section to exchange heat in the furnace to heat the recycled nitrogen-hydrogen protective gas, and then the nitrogen-hydrogen protective gas is injected to the upper surface and the lower surface of the strip steel to realize forced convection heat exchange;
The transverse magnetic induction heating section or the jet-air radiation composite heating section is arranged in parallel or in series;
an optional withdrawal straightening station and/or a surface post-treatment station such as passivation or fingerprint resistance and the like are arranged between the flattening station and the outlet looper station;
the jet-radiation composite soaking section adopts a rapid soaking mode combining forced convection and radiation;
the production line has more than three selectable process paths, and can realize the production of five different types of high-strength steel including cold rolling annealing, acid washing, flash plating, hot plating pure zinc and alloying hot galvanizing.
2. The post-treatment line for flexible cold-rolled steel strip suitable for producing various high-strength steels according to claim 1, wherein a radiant tube heating section is arranged between the jet radiant composite heating section and the jet radiant composite soaking section.
3. The post-treatment line for flexible cold-rolled steel strip suitable for producing various high-strength steels according to claim 1 or 2, wherein a balancing heat-preserving section is arranged between the reheating section and the furnace nose section.
4. The post-treatment line for flexible cold-rolled steel strip suitable for producing various high-strength steels according to claim 3, wherein a secondary reheating section is arranged after the balancing heat-preserving section and is connected with the moving channel section and the furnace nose section.
5. A flexible cold rolled strip steel post-treatment line suitable for producing various high strength steels according to claim 1, 2 or 3, characterized in that a mobile post-plating quick cooling section is arranged between the air knife section and the post-plating cooling section, and the mobile post-plating quick cooling section is arranged in parallel with an alloying heating device; preferably, a mobile plating post-fast cooling section is arranged within a range of 10 meters above the air knife section.
6. The post-treatment line for flexible cold-rolled steel strip suitable for producing various high-strength steels according to any one of claims 1 to 5, wherein an acid washing section is provided between the rapid cooling section and the reheating section, and comprises an acid washing unit, a hot water scrubbing unit, a hot water rinsing unit and a hot air drying unit.
7. The post-treatment line for a flexible cold-rolled steel strip suitable for producing a plurality of high-strength steels according to claim 6, wherein a flash iron or nickel plating section is provided before the reheating section after the pickling section, and the reheating section is connected.
8. A spray direct fire preheating device for a post-treatment line of a flexible cold rolled steel strip suitable for producing a plurality of high strength steels according to any one of claims 1 to 7, comprising: a direct fire furnace and a preheating furnace; wherein,
The direct fire includes:
a furnace shell, the upper end and the lower end of which are respectively provided with a furnace top roller chamber and a furnace bottom roller chamber; steering rollers are respectively arranged in the furnace top roller chamber and the furnace bottom roller chamber; a plurality of direct-fire heating areas are arranged in the furnace shell along the height direction, and a plurality of direct-fire burners are arranged in the direct-fire heating areas; the side wall of the upper part of the furnace shell is provided with at least two through holes which are symmetrically arranged left and right;
the preheating furnace comprises:
the side wall of the upper part of the furnace body is provided with at least two connecting holes which are symmetrically arranged left and right and are respectively connected with the through holes on the upper part of the furnace shell of the direct-fired furnace through communicating pipes; the top end of the furnace body is provided with a furnace throat which corresponds to the furnace top roller chamber of the direct furnace and is used for the strip steel to pass through; the bottom of the furnace body is provided with a strip steel inlet, a corresponding sealing device and a corresponding steering roller; an upper partition plate with a through hole is arranged at the upper part in the furnace body to form an upper gas collection chamber of the direct-fire waste gas; a direct-fire combustion waste gas secondary combustion chamber is arranged below the upper gas collection chamber of the direct-fire waste gas, and at least one open-fire burner is arranged in the direct-fire combustion waste gas secondary combustion chamber; preferably, a combustion waste gas thermometer is further arranged in the direct-fired combustion waste gas secondary combustion chamber; a lower partition plate with a penetrating hole is arranged at the lower part in the furnace body to form a lower straight fire waste gas collecting chamber, and the lower straight fire waste gas collecting chamber is connected with a waste gas fan through a waste gas discharge pipeline; a control valve is arranged on the waste gas discharge pipeline;
The heat exchange and air injection bellows units are arranged on two sides below the direct-fired combustion waste gas secondary combustion chamber in the furnace body along the height direction of the furnace body, and a strip penetrating channel for strip steel to pass through is formed in the middle of the heat exchange and air injection bellows units; each heat exchange and air injection bellows unit comprises,
the air box body is vertically provided with a plurality of heat exchange tubes, and a plurality of nozzles are arranged on one side surface of the air box body, which is opposite to the threading channel; an exhaust gas secondary mixing chamber communicated with the heat exchange tube is arranged between the upper and lower bellows bodies; introducing nitrogen and hydrogen protective gas into the bellows body;
the port of the inlet pipeline of the circulating fan is arranged in the threading channel, and the port of the outlet pipeline of the circulating fan is positioned in the bellows body;
the sealing devices are respectively arranged at the upper and lower ports of the threading channel and the threading holes of the upper and lower partition plates; preferably, the sealing device is of a nitrogen sealing structure, a nitrogen sealing chamber is adopted, and a nitrogen injection pipeline is arranged on the sealing device.
9. A jet-radiation composite heating/soaking apparatus for a post-treatment line of a flexible cold-rolled steel strip suitable for producing a plurality of high-strength steels according to any one of claims 1 to 7, characterized by comprising:
the furnace body is internally provided with a composite heating body along the height direction; the composite heating body comprises an insulation box body, wherein an insulation material is arranged on the inner wall of the shell; a mounting hole is arranged in the center of one side surface of the heat preservation box body;
The circulating fan is arranged at the mounting hole of the heat insulation box body, the air suction inlet of the circulating fan corresponds to the axis of the mounting hole, and the air outlet is arranged on the side surface of the shell;
the buffer cavity is arranged in the insulation box body at a position corresponding to the air suction opening of the circulating fan, the back surface of the buffer cavity is provided with a hot air outlet corresponding to the air suction opening of the circulating fan, and the front surface of the buffer cavity is provided with a hot air inlet; preferably, the buffer cavity and the high-temperature air injection bellows are of an integrated structure;
the two high-temperature air jet bellows are vertically and symmetrically arranged at two sides of a hot air inlet at the front side of the buffer cavity in the heat insulation box body to form a strip penetrating channel for strip steel to pass through; a plurality of rows of jet nozzles are arranged on one side surface of the two high-temperature jet bellows at two sides of the threading channel at intervals along the height direction, and a gap is arranged between n rows of jet nozzles, wherein n is more than or equal to 1; preferably, the diameter of the jet nozzle is 1/10-1/5 of the distance from the jet nozzle to the strip steel; more preferably, the jet nozzle adopts a round hole structure;
the radiant tubes are symmetrically arranged in the two high-temperature air injection bellows and comprise a connecting tube section for connecting a burner, a radiant tube section bent and extended from one end of the connecting tube section and a heat exchange tube section formed by extending and bending from one end of the radiant tube section; the radiant tube section corresponds to gaps arranged between n rows of jet nozzles in the high-temperature jet bellows, so as to form a jet-radiation alternating structure;
Preferably, the radiant tube section, the connecting tube section and the heat exchange tube section of the radiant tube are arranged in parallel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211122533.8A CN117702035A (en) | 2022-09-15 | 2022-09-15 | Flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steel |
| PCT/CN2023/119209 WO2024056085A1 (en) | 2022-09-15 | 2023-09-15 | Rapid heat treatment production line of strip steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211122533.8A CN117702035A (en) | 2022-09-15 | 2022-09-15 | Flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steel |
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| CN117702035A true CN117702035A (en) | 2024-03-15 |
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| CN202211122533.8A Pending CN117702035A (en) | 2022-09-15 | 2022-09-15 | Flexible cold-rolled strip steel post-treatment line suitable for producing various high-strength steel |
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