CN117737392A - Quick continuous annealing high-strength strip steel production line - Google Patents
Quick continuous annealing high-strength strip steel production line Download PDFInfo
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- CN117737392A CN117737392A CN202211122150.0A CN202211122150A CN117737392A CN 117737392 A CN117737392 A CN 117737392A CN 202211122150 A CN202211122150 A CN 202211122150A CN 117737392 A CN117737392 A CN 117737392A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 130
- 239000010959 steel Substances 0.000 title claims abstract description 130
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 57
- 238000000137 annealing Methods 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 169
- 238000010438 heat treatment Methods 0.000 claims abstract description 163
- 230000005855 radiation Effects 0.000 claims abstract description 68
- 239000002131 composite material Substances 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000010791 quenching Methods 0.000 claims abstract description 37
- 230000000171 quenching effect Effects 0.000 claims abstract description 37
- 239000000443 aerosol Substances 0.000 claims abstract description 32
- 239000001257 hydrogen Substances 0.000 claims abstract description 27
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 27
- 230000006698 induction Effects 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000002791 soaking Methods 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 17
- 238000003303 reheating Methods 0.000 claims abstract description 13
- 238000010583 slow cooling Methods 0.000 claims abstract description 11
- 238000007747 plating Methods 0.000 claims abstract description 9
- 238000005554 pickling Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000002161 passivation Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 238000005406 washing Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 9
- 238000010924 continuous production Methods 0.000 description 8
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000003595 mist Substances 0.000 description 5
- 239000002912 waste gas Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
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- 239000002918 waste heat Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
A rapid annealing high-strength strip steel production line sequentially comprises the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling; the central continuous post-treatment station sequentially comprises 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 overaging section, a final jet cooling section and a final water cooling section; the radiation pipe is arranged in the high-speed jet heating bellows by the jet radiation composite heating section, and heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through two modes of high-speed high-temperature jet and radiation, so that the rapid heating of the strip steel is realized; the rapid cooling section comprises a high-hydrogen cooling section or an aerosol cooling section or a water quenching cooling section; the production line is provided with rapid heating and various rapid cooling, and can be selectively provided with pickling and flash plating, so that high-strength strip steel products with various surface states can be produced on the same production line.
Description
Technical Field
The invention relates to the technical field of strip steel cold rolling post-treatment, in particular to a rapid continuous annealing high-strength strip steel production line.
Background
The automotive industry has become one of the pillar industries in China. Safety is a primary requirement of automobiles. In order to improve the safety of the vehicle body, the automotive material needs to have sufficient strength, and in general, the higher the material strength, the greater the absorption energy at the time of collision, and the more advantageous the safety of the vehicle body. Along with the increasing aggravation of global environment deterioration and energy shortage problems, the improvement of vehicle collision safety standards and automobile exhaust emission regulation limits in all countries in the world is added, so that the automobile weight reduction becomes one of the main development directions of the automobile manufacturing industry. Considering the manufacturing cost, recovery and maintenance of automobiles comprehensively, high-strength steel, particularly ultrahigh-strength steel, is still the first choice material for the development of the automobile industry in the future. Accordingly, the demand of the automotive industry for high strength steel strips, particularly ultra high strength steel strips, is rapidly increasing year by year. The production of continuously annealed cold-rolled ultra-high-strength strip steel is always one of the focus of each large steel mill. In recent years, some new production processes are developed for ultra-high strength steel production, and the conventional strip steel production line cannot meet the requirements of the new processes.
Conventional continuous annealing strip steel processing lines typically include the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, intermediate looping, flattening, outlet looping, finishing and coiling, wherein a withdrawal and straightening station is further arranged between a flattening station and a finishing station in some treatment lines, a surface post-treatment station such as passivation or fingerprint resistance is arranged between the flattening station and the finishing station in some treatment lines, and a withdrawal and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are simultaneously arranged between the flattening station and the finishing station in some treatment lines, as shown in figure 1.
The central continuous post-treatment station generally comprises equipment such as a common preheating section, a heating section, a soaking section, a slow cooling section, a fast cooling section, an Overaging (OA) section, a jet cooling section and a final water cooling section when producing continuously annealed cold rolled products. 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. See also fig. 1 in particular.
The common preheating section and the heating section of the traditional continuous annealing strip steel treatment line are heated by using a radiant tube, and the strip steel is preheated by using the combustion waste gas of the radiant tube. There are the following disadvantages:
1) The exhaust temperature of the combustion exhaust gas after preheating the strip steel is still higher, the temperature is usually higher than 350 ℃ when the high-temperature annealing material is produced, a boiler or a superheated water heating device is required to be added for secondary utilization of the waste heat of the combustion exhaust gas, the economic efficiency is obviously reduced, and the occupied area of equipment is large.
2) The ratio of directly utilizing energy to the strip steel is low, namely a great amount of heat is still taken away by waste gas after the strip steel is preheated (the higher the temperature of the waste gas after the strip steel is preheated, the more heat is taken away), and the burnt heat is not fully transmitted to the strip steel (namely, the primary utilization rate of the energy is low). Also, the preheating of the strip is limited in temperature, and it is generally difficult to exceed 250 ℃.
3) The annealing heating temperature of the strip is limited, and is usually not more than 890 ℃.
Disclosure of Invention
The invention aims to design a rapid continuous annealing high-strength strip steel production line, which adopts jet radiation composite heating and transverse magnetic induction heating to realize rapid strip steel heating, adopts a high-hydrogen cooling section or an aerosol cooling section or a water quenching cooling section to realize rapid strip steel cooling, and shortens the heat treatment cycle time of strip steel; the application of the rapid heat treatment process technology can adopt lower alloy components to produce various advanced high-strength steel products with higher strength grades, so that the production cost of the high-strength steel can be reduced, and the mechanical properties and the subsequent processing properties (such as welding property and coating property) of various super-high-strength steel products can be improved; meanwhile, the temperature of the strip steel is quickly heated to be more than 900 ℃ so as to realize the ultrahigh-temperature annealing treatment of the high-strength steel.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a rapid annealing high-strength strip steel production line sequentially comprises the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises an air injection 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 overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, and the rapid heating of the strip steel is realized;
the rapid cooling section comprises a high-hydrogen cooling section or an aerosol cooling section or a water quenching cooling section;
the soaking section adopts a radiant tube heating device or a jet-jet radiation composite heating device.
The invention also provides a rapid annealing high-strength strip steel production line, which sequentially comprises the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises an air injection 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 overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, and the rapid heating of the strip steel is realized;
the rapid cooling section comprises a high-hydrogen cooling section, an aerosol cooling section or a water quenching cooling section; the Gao Qingleng cooling section and the aerosol cooling section are arranged in parallel, or the Gao Qingleng cooling section and the water quenching cooling section are arranged in parallel;
the soaking section adopts a radiant tube heating device or a jet-jet radiation composite heating device.
The production line adopts a rapid cooling mode of a jet-air radiation composite heating device, a transverse magnetic induction heating section, a high-hydrogen cooling section or an aerosol cooling section or a water quenching cooling section at the same time to perform rapid heating and rapid cooling treatment, so that the continuous production of the ultra-high-strength strip steel is realized.
Furthermore, the rapid annealing high-strength strip steel production line provided by the invention sequentially comprises the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises an air injection 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, a reheating section, an overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, and the rapid heating of the strip steel is realized;
the rapid cooling section comprises an aerosol cooling section and a water quenching cooling section which are arranged in parallel, and a connecting channel is arranged between the aerosol cooling section and the water quenching cooling section; the strip steel can be formed into three cooling modes of aerosol cooling and water quenching cooling, or only aerosol cooling or only water quenching cooling;
the soaking section adopts a radiant tube heating device or a jet-jet radiation composite heating device;
the transverse magnetic induction heating section is used for further rapid elevation of the temperature of high Wen Daigang.
Further, the rapid cooling section further comprises a high-hydrogen cooling section which is arranged in parallel with the aerosol cooling section; the Gao Qingleng cooling section is arranged in parallel with the aerosol cooling section and the water quenching cooling section which are arranged in series to form a fourth cooling mode of strip steel or only select a high-hydrogen cooling section.
Preferably, an optional acid wash stage is provided after the final water-cooled stage.
Preferably, an optional flash stage is provided after the acid wash stage.
Preferably, a cleaning station is arranged between the welding station and the inlet loop station, and preferably, the cleaning station is arranged at the front and the rear of the inlet loop station.
Preferably, a finishing station is provided before the winding station.
Preferably, an intermediate looper station is provided before the levelling station.
Preferably, a withdrawal and straightening station is arranged between the flattening station and the outlet looper station.
Preferably, a surface post-treatment station such as passivation or fingerprint resistance is arranged between the leveling station and the outlet looper station.
Preferably, a withdrawal straightening station and a surface post-treatment station such as passivation or fingerprint resistance are arranged between the flattening station and the outlet looper station.
The production line adopts a rapid cooling device in a jet-air radiation composite heating device, a transverse magnetic induction heating section and a high-hydrogen cooling section or an aerosol cooling section device or a water quenching cooling section device at the same time to perform rapid heating and rapid cooling treatment, thereby realizing the continuous production of the ultra-high-strength strip steel.
The invention relates to a jet-radiation composite heating device, which comprises:
the furnace body is internally provided with a composite heating body along the height direction; the composite heating body comprises a plurality of heating elements,
the inner wall of the shell of the heat preservation box body is provided with a heat preservation material; 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-speed jet heating bellows are of an integrated structure;
the two high-speed jet heating 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-speed jet heating bellows at two sides of the threading channel at intervals along the height direction, a gap is arranged between n rows of jet nozzles, and when n is more than or equal to 1 and n=1, the radiant tubes are arranged above or below the row of jet nozzles in parallel; 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-speed jet heating bellows, and each radiant tube comprises a connecting tube section connected with the 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 one end of the radiant tube section; the radiant tube section corresponds to gaps arranged between n rows of jet nozzles in the high-speed jet heating bellows, so that a jet and radiation alternating structure is formed; 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 device adopts the composite heating technology, and the composite heating technology can organically combine the high-speed high-temperature jet-heating technology with the radiant tube heating technology, so that the technical advantages of the high-speed high-temperature jet-heating technology and the radiant tube heating technology are fully exerted. 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 a high-speed high-temperature jet air box and a radiation mode, the rapid heating of the strip steel is realized, the highest average heating speed of the strip steel with the speed 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 the annual output of 30 ten thousand tons 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 smoke discharging temperature of the radiant tube can be reduced by taking away, and the smoke discharging temperature of the radiant tube can be reduced by about 100 ℃ under the same condition, thereby improvingThe heat efficiency of the radiant tube is 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 device has the functions of combustion radiation (namely, the 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-scale vertical continuous annealing furnace body is reduced.
The production line of the invention is different from the traditional continuous heat treatment line in the following points or innovation points:
the invention uses the jet-air radiation composite heating device to heat the strip steel rapidly, the heating equipment heats the strip steel by using the radiation pipe radiation, and also heats the recycled nitrogen-hydrogen protective gas or total hydrogen gas (the hydrogen concentration is 100%) by using the combustion waste gas of the radiation pipe, and then the nitrogen-hydrogen protective gas or the total hydrogen gas is sprayed to the upper surface and the lower surface of the strip steel to realize forced convection heat exchange, so that the heat exchange efficiency is high, the waste gas temperature can be directly utilized and then is lower than 250 ℃ for emission, and the combustion heat is basically completely transmitted to the heating of the utilized strip steel.
The transverse magnetic induction heating equipment is arranged behind the heating section of the radiant tube, so that the temperature of the high Wen Daigang can be further and rapidly increased, and the strip steel can be heated to more than 900 ℃ for annealing treatment.
According to the invention, through the matched use of the jet-air radiation composite heating equipment, the transverse magnetic induction heating equipment and the high-hydrogen quick cooling equipment, the quick heating and quick cooling annealing treatment of the high-strength steel are realized, and the strength of the high-strength steel can be improved.
The invention can realize continuous production of the ultra-high-strength steel with three different surface states of cold rolling annealing, acid washing and flash plating.
The invention has the beneficial effects that:
1) The invention realizes the rapid heating and cooling treatment of the strip steel and can produce high-strength strip steel products with high strength level;
2) The invention can realize ultra-high temperature annealing at the temperature of more than 900 ℃;
3) When the jet-radiation composite soaking is adopted, the soaking temperature of the strip steel can be quickly adjusted when the working conditions such as the thickness specification of the strip steel is changed, the target temperature is changed, the speed of a unit is changed and the like are changed, and the quality loss caused by inconsistent strip steel temperature can be reduced;
4) 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, the components of 450MPa products can reach the strength of 590MPa products, the components of 780MPa products can reach the performance of 980MPa products, the production cost of the high-strength steel can be reduced, the mechanical properties and the subsequent processing properties (such as welding property and coating property) of various super-high-strength steel products can be improved, and the market competitiveness of the high-strength steel products is obviously improved;
5) The invention realizes the rapid heating and rapid cooling treatment of the ultra-high strength steel and shortens the heat treatment cycle time of the strip steel.
Drawings
FIG. 1 is a schematic diagram of a station arrangement of a conventional continuous annealing line;
FIG. 2 is a schematic diagram of a station arrangement of a production line according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a production line station arrangement according to embodiment 2 of the present invention;
FIG. 4 is a schematic diagram of a station arrangement of a production line in accordance with embodiment 3 of the present invention;
FIG. 5 is a schematic diagram of a station arrangement of a production line in accordance with example 4 of the present invention;
FIG. 6 is a schematic diagram of a station arrangement of a production line in accordance with example 5 of the present invention;
FIG. 7 is a schematic diagram of a station arrangement of a production line in accordance with example 6 of the present invention;
FIG. 8 is a schematic diagram of a station arrangement of a production line in accordance with example 7 of the present invention;
FIG. 9 is a schematic view 1 of an embodiment of a jet-radiation composite heating device according to the present invention;
FIG. 10 is a schematic view of an embodiment of a jet-beam radiation composite heating apparatus according to the present invention 2;
FIG. 11 is a schematic structural diagram of a composite heating body in an embodiment of the jet radiation composite heating device according to the present invention;
FIG. 12 is a partial perspective view of a high velocity jet heating bellows in an embodiment of a jet radiant composite heating device according to the present invention;
fig. 13 is a perspective view of a radiant tube in an embodiment of the jet radiant composite heating device according to the present invention.
Detailed Description
The invention is further described below with reference to examples and figures.
Referring to fig. 2 to 4, 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 looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling;
the central continuous post-treatment station sequentially comprises an air injection 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 (a high hydrogen cooling section, or an aerosol cooling section or a water quenching cooling section), a reheating section, an overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed jet-heating bellows, so that heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel in a high-speed jet-radiation mode, and the rapid heating of the strip steel is realized;
the transverse magnetic induction heating section is used for further rapid elevation of the temperature of high Wen Daigang.
The production line adopts a rapid cooling device in a jet-air radiation composite heating section, a transverse magnetic induction heating section, a high-hydrogen cooling section, an aerosol cooling section or a water quenching cooling section to perform rapid heating and rapid cooling treatment, so that the continuous production of the ultra-high-strength strip steel is realized.
Referring to fig. 5, an embodiment 4 of the present invention is shown, and in the embodiment 4, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling;
the central continuous post-treatment station sequentially comprises an air injection 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 (a high hydrogen cooling section and an aerosol cooling section), a reheating section, an overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, and the rapid heating of the strip steel is realized;
the transverse magnetic induction heating section is used for further and rapid elevation of the temperature of high Wen Daigang;
the Gao Qingleng cooling sections and the aerosol cooling sections are arranged in parallel, and the strip steel can be subjected to high-hydrogen cooling by selecting the high-hydrogen cooling sections or can be subjected to aerosol cooling by selecting the aerosol cooling sections.
The production line adopts the jet radiation composite heating section, the high-hydrogen cooling section and the aerosol cooling section simultaneously to carry out rapid heating and optional rapid cooling treatment, thereby realizing the continuous production of the ultra-high-strength strip steel.
Referring to fig. 6, an embodiment 5 of the present invention is shown, and in the embodiment 5, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling;
the central continuous post-treatment station sequentially comprises an air injection 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 (a high hydrogen cooling section and a water quenching cooling section), a reheating section, an overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, and the rapid heating of the strip steel is realized;
the transverse magnetic induction heating section is used for further and rapid elevation of the temperature of high Wen Daigang;
the Gao Qingleng cooling sections and the water quenching cooling sections are arranged in parallel, and the strip steel can be subjected to high-hydrogen cooling by selecting the high-hydrogen cooling sections or subjected to water quenching by selecting the water quenching cooling sections.
The production line adopts the jet radiation composite heating section, the high-hydrogen cooling section and the water quenching cooling section equipment to perform rapid heating and optional rapid cooling treatment, thereby realizing the continuous production of the ultra-high-strength strip steel.
Referring to fig. 7, an embodiment 6 of the present invention is shown, and in the embodiment 6, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling;
the central continuous post-treatment station sequentially comprises an air injection 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 (an aerosol cooling section and a water quenching cooling section), a reheating section, an overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, and the rapid heating of the strip steel is realized;
the transverse magnetic induction heating section is used for further and rapid elevation of the temperature of high Wen Daigang;
the gas mist cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is arranged between the gas mist cooling section and the water quenching cooling section; the strip steel can be cooled by aerosol cooling and then water quenching, or can be cooled by aerosol cooling or water quenching.
The production line adopts an air jet radiation composite heating section, a transverse magnetic induction heating section, an aerosol cooling section and a water quenching cooling section simultaneously to carry out rapid heating and optional rapid cooling treatment, thereby realizing the continuous production of the ultra-high strength strip steel.
Referring to fig. 8, an embodiment 7 of the present invention is shown, and in the embodiment 7, the rapid annealing high-strength strip steel production line of the present invention includes the following stations: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling;
the central continuous post-treatment station sequentially comprises an air injection 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 (a high hydrogen cooling section, an air fog cooling section and a water quenching cooling section), a reheating section, an overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, and the rapid heating of the strip steel is realized;
the transverse magnetic induction heating section is used for further and rapid elevation of the temperature of high Wen Daigang;
the Gao Qingleng cooling section, the aerosol cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is arranged between the aerosol cooling section and the water quenching cooling section;
the strip steel can be cooled only by high hydrogen or only by aerosol or only by water quenching; or the gas mist cooling and then the water quenching cooling can be selected for rapid cooling treatment.
The production line adopts an air jet radiation composite heating section, a transverse magnetic induction heating section, a high hydrogen cooling section and an air mist cooling section and a water quenching cooling section at the same time to carry out rapid heating and optional rapid cooling treatment, thereby realizing the continuous production of the ultra-high strength strip steel.
Preferably, the soaking section of the radiant tube is replaced by the jet-air radiation composite heating device to soak the strip steel, so that the quick adjustment of the soaking temperature of the strip steel is realized when the working conditions such as the thickness specification change, the target temperature change, the unit speed change and the like of the strip steel are changed.
Preferably, an optional pickling section is arranged after the final water-cooling section, and the strip steel can optionally pass through the pickling section or bypass and skip the pickling section.
Preferably, an optional flash plating section is arranged after the acid washing section, the strip steel can be optionally subjected to flash plating or flash plating zinc after acid washing, and the flash plating section can be skipped to directly produce acid washing surface products.
Preferably, the cleaning station is arranged between the welding station and the inlet loop station, further preferably, the cleaning station is arranged before and after the inlet loop station, the strip steel is firstly cleaned for the first time, enters the loop, is cleaned for the second time, and enters the central continuous post-treatment station.
Preferably, a finishing station is arranged before the coiling station, and the strip steel is coiled after finishing.
Preferably, an intermediate loop station is arranged before the leveling station, the center of the strip steel enters the center loop after continuous post-treatment, and then the strip steel enters the leveling station, so that the replacement of a working roller of the leveling machine can be realized without reducing the speed of the center continuous post-treatment.
Preferably, a withdrawal and straightening station is further arranged between the flattening station and the outlet loop station, and the strip steel can be selectively withdrawn and straightened and then enter the outlet loop.
Preferably, a surface post-treatment station such as passivation or fingerprint resistance is arranged between the flattening station and the outlet loop station, and the strip steel can be subjected to surface post-treatment such as passivation or fingerprint resistance and then enters the outlet loop.
Preferably, a withdrawal and straightening station and a surface post-treatment station such as passivation or fingerprint resistance are arranged between the flattening station and the outlet loop station, and the strip steel can be selectively subjected to withdrawal and straightening or/and surface post-treatment such as passivation or fingerprint resistance and then enters the outlet loop.
Referring to fig. 9 to 13, the jet-radiation composite heating 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-speed high-temperature air jet bellows 54, 54' are vertically and symmetrically arranged at two sides of the hot air inlet at the front surface of the buffer cavity 53 in the heat insulation box body 51 to form a strip penetrating channel 200 for the strip steel 100 to penetrate through; a plurality of rows of jet nozzles 55, 55 'are arranged on one side surface of the two high-speed jet heating 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 radiant tubes 56, 56 'are symmetrically disposed in the two high-speed jet heating bellows 54, 54', and the radiant tubes 56 (radiant tubes 56 are exemplified by the same below) include a connection tube section 561 for connecting with a burner, a radiant tube section 562 bent and extended from one end of the connection tube section 561, and a heat exchange tube section 563 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 velocity jet heating windbox 54 to form an alternating jet and radiant configuration.
Preferably, the buffer cavity and the high-speed jet heating 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
And (3) producing high-strength steel, wherein a gas production line is shown in fig. 2, uncoiling, welding, passing through an inlet loop and cleaning strip steel with the main chemical composition (mass%) of 0.10-0.18-1.96-percent Mn of a substrate, heating to 600 ℃ by jet radiation in a combined mode, heating a radiant tube to 810 ℃, heating to 920 ℃ by transverse magnetic induction, soaking the radiant tube at 920 ℃ for 40 seconds, slowly cooling to 670 ℃, cooling to about 250 ℃ by high hydrogen jet, then entering an overaging section (reheating without input), carrying out overaging treatment, cooling to about 140 ℃ by jet air, finally cooling to room temperature by water, passing through an outlet loop after flattening, and coiling to finish production. The final product band steel has yield strength of 519MPa, tensile strength 955MPa and breaking elongation of 20%.
Example 2
A high-strength steel is produced, the production line is shown in figure 3, an acid washing section is arranged after a final water cooling section on the basis of the production line in the embodiment 2, strip steel with the main chemical composition (mass%) of 0.06 percent C-0.010 percent Si-0.90 percent Mn is uncoiled, welded, passed through an inlet loop and cleaned, then jet-air radiation is compositely heated to 500 ℃, then a radiant tube is heated to 710 ℃, then the transverse magnetic induction is heated to 810 ℃, the radiant tube is soaked for 60 seconds at 810 ℃, slowly cooled to 675 ℃, the gas mist is cooled to 500 ℃, then water quenched to room temperature, then the temperature is heated to 230 ℃, then overaging treatment is carried out, finally the jet-air is cooled to about 140 ℃, finally water cooled to room temperature, then acid washing treatment is carried out, and after the acid washing is finished, the production is completed by flattening, passing through an outlet loop and coiling. The yield strength of the final product strip steel is 585MPa, the tensile strength is 696MPa, and the elongation at break is 13%.
Example 3
An ultra-high strength steel is produced, the production line is shown in fig. 4, an acid washing section and a flash plating section are arranged after a final water cooling section on the basis of the production line described in the embodiment 3, strip steel with the main chemical components (mass%) of 0.11-0.23% of C-0.23% of Si and 2.38% of Mn is uncoiled, welded, passed through an inlet loop and cleaned, then jet-air radiation is compositely heated to 565 ℃, a radiant tube is heated to 730 ℃, then the transverse magnetic induction is heated to 830 ℃, then the radiant tube is soaked for 60 seconds at 830 ℃, slowly cooled to 700 ℃, then water quenched to be cooled to about 50 ℃, then heated to 230 ℃ and then enters an overaging section for overaging treatment, finally jet-air cooled to about 140 ℃ and finally cooled to room temperature, then acid washing, flash plating, finally passed through an outlet loop after leveling, coiled and finally the production is completed. The final product band steel has 1093MPa of yield strength, 1359MPa of tensile strength and 5% of elongation at break.
Claims (10)
1. The rapid annealing high-strength strip steel production line is characterized by comprising the following stations in sequence: uncoiling, welding, inlet looping, cleaning, central continuous post-treatment, flattening, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises an air injection 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 overaging section, a final air injection cooling section and a final water cooling section;
the jet-radiation composite heating section is characterized in that a radiation pipe is arranged in a high-speed high-temperature jet-air box, and heat generated by burning gas of the radiation pipe is rapidly transferred to the strip steel through a high-speed high-temperature jet-air mode and a radiation mode, so that the strip steel is rapidly heated;
the rapid cooling section comprises a high-hydrogen cooling section or an aerosol cooling section or a water quenching cooling section; or, the Gao Qingleng cooling section and the aerosol-cooling section are arranged in parallel; or, the Gao Qingleng 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 arranged between the aerosol cooling section and the water quenching cooling section; or the Gao Qingleng cooling section, the aerosol cooling section and the water quenching cooling section are arranged in parallel, and a connecting channel is arranged between the aerosol cooling section and the water quenching cooling section;
the soaking section adopts a radiant tube heating device or a jet-jet radiation composite heating device.
2. The rapid annealing high-strength strip steel production line of claim 1, wherein an optional pickling section is provided after the final water-cooling section.
3. The rapid annealing high-strength strip steel production line of claim 2, wherein an optional flash plating section is provided after the pickling section.
4. A rapid annealing high-strength strip steel production line according to any one of claims 1 to 3, wherein a cleaning station is provided between the welding station and the inlet looping station, preferably before and after the inlet looping station.
5. The rapid annealing high-strength strip steel production line according to any one of claims 1 to 4, wherein a finishing station is provided before the coiling station.
6. The rapid annealing high-strength strip steel production line according to any one of claims 1 to 5, wherein an intermediate looper station is provided before the flattening station.
7. The rapid annealing high-strength strip steel production line according to any one of claims 1 to 6, wherein a withdrawal and straightening station is provided between the flattening station and the outlet looper station.
8. The rapid annealing high-strength strip steel production line according to any one of claims 1 to 7, wherein a surface post-treatment station such as passivation or fingerprint resistance is provided between the flattening station and the outlet looper station.
9. The rapid annealing high-strength strip steel production line according to any one of claims 1 to 7, wherein a withdrawal straightening station and a surface post-treatment station such as passivation or fingerprint resistance are arranged between the flattening station and the outlet looper station.
10. A jet-radiation composite heating device for a rapid annealing high-strength strip steel production line according to any one of claims 1 to 9, comprising:
the furnace body is internally provided with a composite heating body along the height direction; the composite heating body comprises a plurality of heating elements,
the inner wall of the shell of the heat preservation box body is provided with a heat preservation material; 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-speed jet heating bellows are of an integrated structure;
the two high-speed jet heating 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-speed jet heating bellows at two sides of the penetrating channel along the height direction at intervals, 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-speed jet heating bellows, and each radiant tube comprises a connecting tube section connected with the 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 one end of the radiant tube section; the radiant tube section corresponds to gaps arranged between n rows of jet nozzles in the high-speed jet heating bellows, so that a jet and radiation alternating structure is formed; 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 |
|---|---|---|---|
| CN202211122150.0A CN117737392A (en) | 2022-09-15 | 2022-09-15 | Quick continuous annealing high-strength strip steel production line |
| 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 |
|---|---|---|---|
| CN202211122150.0A CN117737392A (en) | 2022-09-15 | 2022-09-15 | Quick continuous annealing high-strength strip steel production line |
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| CN117737392A true CN117737392A (en) | 2024-03-22 |
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|---|---|---|---|
| CN202211122150.0A Pending CN117737392A (en) | 2022-09-15 | 2022-09-15 | Quick continuous annealing high-strength strip steel production line |
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| Country | Link |
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| CN (1) | CN117737392A (en) |
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- 2022-09-15 CN CN202211122150.0A patent/CN117737392A/en active Pending
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