CN117737397A - Ultra-short flow ultra-high strength strip steel production line - Google Patents
Ultra-short flow ultra-high strength strip steel production line Download PDFInfo
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- CN117737397A CN117737397A CN202211122426.5A CN202211122426A CN117737397A CN 117737397 A CN117737397 A CN 117737397A CN 202211122426 A CN202211122426 A CN 202211122426A CN 117737397 A CN117737397 A CN 117737397A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 134
- 239000010959 steel Substances 0.000 title claims abstract description 134
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 94
- 238000010438 heat treatment Methods 0.000 claims abstract description 172
- 230000005855 radiation Effects 0.000 claims abstract description 84
- 238000001816 cooling Methods 0.000 claims abstract description 75
- 239000002131 composite material Substances 0.000 claims abstract description 67
- 238000002791 soaking Methods 0.000 claims abstract description 59
- 230000006698 induction Effects 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000001257 hydrogen Substances 0.000 claims abstract description 28
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 28
- 238000010791 quenching Methods 0.000 claims abstract description 28
- 230000000171 quenching effect Effects 0.000 claims abstract description 28
- 238000003466 welding Methods 0.000 claims abstract description 22
- 239000000443 aerosol Substances 0.000 claims abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 238000004140 cleaning Methods 0.000 claims description 17
- 238000009413 insulation Methods 0.000 claims description 10
- 239000003595 mist Substances 0.000 claims description 9
- 238000005554 pickling Methods 0.000 claims description 7
- 238000007747 plating Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 abstract description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 19
- 239000000047 product Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 238000000137 annealing Methods 0.000 description 7
- 238000013329 compounding Methods 0.000 description 6
- 230000006798 recombination Effects 0.000 description 6
- 238000005215 recombination Methods 0.000 description 6
- 150000002431 hydrogen Chemical class 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000001680 brushing effect Effects 0.000 description 4
- 239000012467 final product Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 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
- 239000000567 combustion gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
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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
- Y02P10/25—Process efficiency
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
An ultra-short flow ultra-high strength strip steel production line sequentially comprises the following stations: uncoiling, welding, inlet looping, central continuous post-treatment, outlet looping and coiling; the central continuous post-treatment station sequentially comprises a rapid heating station, a soaking station and a rapid cooling station; the rapid heating station adopts an air jet radiation composite heating device; the soaking station adopts radiant tube soaking equipment, jet-air radiation composite soaking device, electric radiant tube soaking equipment, resistance wire soaking equipment or resistance belt soaking equipment; the rapid cooling station adopts high-hydrogen cooling, aerosol cooling or water quenching cooling. The production line adopts the combination of jet-radiation composite heating or jet-radiation composite heating series transverse magnetic induction heating equipment and three optional rapid cooling equipment to perform rapid heating, soaking and rapid cooling treatment, so as to realize the continuous production of the ultra-high-strength strip steel.
Description
Technical Field
The invention relates to the technical field of strip steel cold rolling post-treatment, in particular to an ultra-short flow ultra-high strength strip steel production line.
Background
Along with the increasing aggravation of global environment deterioration and energy shortage problems, and the improvement of vehicle collision safety standards and automobile exhaust regulation limit in all countries of the world, the strong demands of the automobile industry in the aspects of environmental protection, safety, energy conservation and the like are added, so that the automobile weight reduction becomes the main development direction of the automobile manufacturing industry. Particularly, in the future, development, popularization and application of electric vehicles are in trend of reducing the weight of the vehicle body. 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.
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 device is arranged between a flattening station and a finishing station of some treatment lines, a surface post-treatment station device such as passivation or fingerprint resistance is arranged between the flattening station and the finishing station of some treatment lines, and a withdrawal and straightening station device and a surface post-treatment station device such as passivation or fingerprint resistance are arranged between the flattening station and the finishing station of some treatment lines at the same time, 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.
For the above-mentioned conventional continuous annealing strip steel treatment line, there are the following disadvantages:
1. the unit occupies a long area, has large equipment investment, is configured by operators, and has high overall operation cost;
2. usually, a large amount of mixed gas or gas fuel such as natural gas or liquefied petroleum gas, CO 2 The emission is large, the NOx content is easy to exceed standard, and the method is particularly not suitable for being built in densely populated urban areas;
3. the strip steel has low heating speed, and is not suitable for producing ultra-high strength steel needing austenite grain refinement in the strip steel heating process;
4. the whole heat treatment cycle time of heating, soaking and cooling the strip steel is long, and the ultra-high strength steel product which needs to be heated and cooled rapidly at the same time cannot be produced;
5. the maximum heating temperature is limited, and it is generally only 870 ℃ or lower, and it is difficult to heat the material to 900 ℃ or higher.
Disclosure of Invention
The invention aims to provide an ultra-short flow ultra-high strength strip steel production line, which can realize the following purposes: 1) The occupied area of the unit is reduced; 2) The configuration quantity of the crew is reduced; 3) The overall operation cost of the unit is reduced; 4) Through the use of a rapid heating technology, austenite with fine grains can be generated in the heating process of the ultra-high strength steel, so that the strength of the ultra-high strength steel can be further improved; 5) Realizing the rapid heating and cooling treatment of the ultra-high strength steel and shortening the heat treatment cycle time of the strip steel; 6) 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 property and coating property) of various super-high-strength steel products; 7) The ultra-high temperature heating of the ultra-high strength steel is realized, and the heating temperature of the strip steel can be heated to 900 ℃ or even more, so that the ultra-high temperature heating annealing treatment of the ultra-high strength steel is realized.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an ultra-short flow ultra-high strength strip steel production line sequentially comprises the following stations: uncoiling, welding, inlet looping, central continuous post-treatment, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises a rapid heating station, a soaking station and a rapid cooling station;
the rapid heating station adopts an air jet radiation composite heating device;
the soaking station adopts radiant tube soaking equipment, jet-air radiation composite soaking equipment, electric radiant tube soaking equipment, resistance wire soaking equipment or resistance belt soaking equipment;
the rapid cooling station adopts high-hydrogen cooling equipment, aerosol cooling equipment or water quenching cooling equipment.
Furthermore, the rapid heating station adopts an air injection radiation composite heating device and a transverse magnetic induction heating device to be arranged in series, and the rapid cooling station adopts an air mist cooling device and a water quenching cooling device to be arranged in series or in parallel, or the rapid heating station adopts a high hydrogen cooling device and a water quenching cooling device to be arranged in parallel, or the rapid heating station adopts a high hydrogen cooling device and an air mist cooling device to be arranged in parallel, or the rapid heating station adopts a high hydrogen cooling device, an air mist cooling device and a water quenching cooling device to be arranged in parallel.
Preferably, an optional cleaning station is provided between the welding station and the inlet looper station.
Furthermore, the rapid heating station adopts a direct fire heating device which is arranged in parallel and an air injection radiation composite heating device and a transverse magnetic induction heating device which are arranged in series, the strip steel can be heated by the direct fire heating device and the air injection radiation composite heating device and the transverse magnetic induction heating device which are arranged in series, and the strip steel can also bypass and skip the direct fire heating device to directly enter the air injection radiation composite heating device and the transverse magnetic induction heating device which are arranged in series for heating.
And the rapid heating station adopts selectable longitudinal magnetic induction heating equipment and jet radiation composite heating devices and transverse magnetic induction heating equipment which are arranged in series to be arranged in parallel or in series, strip steel can be heated by the longitudinal magnetic induction heating equipment, and can bypass and skip the longitudinal magnetic induction heating equipment to directly enter the jet radiation composite heating devices and the transverse magnetic induction heating devices which are arranged in series to be heated.
Preferably, an optional pickling section device is arranged before the coiling station and after the central continuous post-treatment station, so that the strip steel can be used for pickling the strip steel when the strip steel passes through the pickling section, and the strip steel can be bypassed without passing through the pickling section when the strip steel does not need to be pickled.
Preferably, an optional flash plating section is arranged after the pickling section and before the coiling station, the pickled strip steel can enter the flash plating section selectively to produce flash plating products such as flash plating nickel or zinc, and when the strip steel does not need to be flash plated, the strip steel can bypass the flash plating section.
Preferably, a leveling station is arranged in front of the coiling station, and the strip steel is coiled after being leveled.
Preferably, a finishing station is arranged between the coiling station and the leveling station, and the strip steel is finished and recoiled after being leveled.
Preferably, the electric radiant tube soaking equipment or the resistance wire soaking equipment or the resistance belt soaking equipment is used for replacing the radiant tube soaking equipment or the jet-radiation composite soaking equipment, and is used for constructing the production line for producing the ultra-high-strength strip steel in places without fuel gas.
Preferably, an optional cleaning station is arranged between the welding station and the inlet loop station, and the strip steel can be cleaned through the cleaning station or can bypass and skip the cleaning station. It is further preferred that the optional cleaning station is arranged immediately after the inlet looper station, so that constant speed cleaning can be realized when the strip steel enters the cleaning station equipment for cleaning, and stable cleaning quality of the strip steel surface is maintained.
Furthermore, the present invention provides a jet-radiation composite heating/soaking device, 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; when 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 soaking device adopts a composite heating technology, and the composite heating technology can organically combine the high-speed jet heating technology and the radiant tube heating technology, so that the technical advantages of the high-speed 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 jet heating bellows, heat generated by combustion gas of the radiant tube is rapidly transferred to the strip steel through two modes of high-speed 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 the heating furnace can be greatly shortened, the heating section of a 30-ten thousand-ton unit with annual 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 has the combustion radiation function, the radiation function mainly refers to the high temperature section of the radiant tube between two rows of nozzles, and the radiant tube also has the heat exchanger function for heating the circulating gas, so that the heat of the combustion gas in the radiant tube can be quickly transferred to the 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.
In addition, the preheating device adopts the flue gas discharged by the composite heating radiant tube to directly preheat the strip steel or adopts the flue gas to exchange heat with the protective gas to indirectly preheat the strip steel through the protective gas.
The production line of the invention has the following different points or innovation points from the traditional continuous heat treatment line:
1) The equipment is simple in configuration and small in occupied area;
2) The ultra-high strength steel production line has less personnel required to be configured;
3) The ultra-high strength steel production line has low comprehensive operation cost;
4) The ultra-high strength steel production line of the invention is realCO is now 2 And small amount of NOx emission and even zero emission are very suitable for being built in urban steel plants;
5) The rapid heating, rapid cooling and annealing treatment of the ultra-high strength steel is realized by the cooperation of the jet-air radiation composite heating device and various rapid cooling devices, and the rapid heat treatment ultra-high strength steel strip can be continuously produced;
6) The invention can economically and rapidly heat the strip steel to 900 ℃ or even more than the temperature through the serial connection of the direct fire heating equipment and the jet radiation composite heating device;
7) In the rapid cooling station, four process paths are available for selection, and the production process is flexible and various;
8) The invention can realize continuous production of the ultra-high-strength steel with three different surface states of cold rolling, acid washing and flash plating.
The invention has the beneficial effects that:
1) Compared with the length of the existing production line, the length of the unit can be shortened by about 1/3;
2) The crew can be less configured, and 3 persons of one crew can run even only by 2 persons;
3) The whole operation cost of the unit is low;
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, and the components of the 450 MPa-grade products can reach the strength of 590 MPa-grade products; the components of 780 MPa-grade products can reach the performance of 980 MPa-grade products, so that the production cost of 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 remarkably improved;
5) Realizing the rapid heating and cooling treatment of the ultra-high strength steel and shortening the heat treatment cycle time of the strip steel;
6) The ultra-high temperature heating of the ultra-high strength steel is realized, and the heating temperature of the strip steel can be heated to 900 ℃ or even higher, so that the ultra-high temperature heating annealing treatment of the ultra-high strength steel is realized.
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 production line of the embodiment 1 of the present invention;
FIG. 3 is a layout of the production line in accordance with embodiment 2 of the present invention;
FIG. 4 is a station layout of the production line of example 3 of the present invention;
FIG. 5 is a station layout of the production line of example 4 of the present invention;
FIG. 6 is a layout of the production line of embodiment 5 of the present invention;
FIG. 7 is a layout of the production line of embodiment 6 of the present invention;
FIG. 8 is a station layout of the production line of example 7 of the present invention;
FIG. 9 is a station layout of the production line of example 8 of the present invention;
FIG. 10 is a layout of the production line of embodiment 9 of the present invention;
FIG. 11 is a production line station layout of embodiment 10 of the present invention;
FIG. 12 is a layout of the production line of embodiment 11 of the present invention;
FIG. 13 is a layout of the production line of embodiment 12 of the present invention;
FIG. 14 is a station layout of the production line of embodiment 13 of the present invention;
FIG. 15 is a station layout of the production line of example 14 of the present invention;
FIG. 16 is a production line station layout of embodiment 15 of the present invention;
FIG. 17 is a station layout of the production line of example 16 of the present invention;
FIG. 18 is a production line station layout of example 17 of the present invention;
FIG. 19 is a production line station layout of embodiment 18 of the present invention;
FIG. 20 is a production line station layout of embodiment 19 of the present invention;
FIG. 21 is a production line station layout of embodiment 20 of the present invention;
FIG. 22 is a production line station layout of embodiment 21 of the present invention;
FIG. 23 is a production line station layout of embodiment 22 of the present invention;
FIG. 24 is a station layout of the production line of example 23 of the present invention;
FIG. 25 is a station layout of the production line of example 24 of the present invention;
FIG. 26 is a production line station layout of embodiment 25 of the present invention;
FIG. 27 is a production line station layout of embodiment 26 of the present invention;
FIG. 28 is a production line station layout of embodiment 27 of the present invention;
FIG. 29 is a production line station layout of embodiment 28 of the present invention;
FIG. 30 is a schematic view of an embodiment of a jet-propelled radiant composite heating/soaking device according to the present invention 1;
FIG. 31 is a schematic view of an embodiment of a jet-propelled radiant composite heating/soaking device according to the present invention in FIG. 2;
fig. 32 is a schematic structural diagram of a composite heating body in an embodiment of the air jet radiation composite heating/soaking device according to the present invention;
FIG. 33 is a partial perspective view of a high temperature jet bellows in an embodiment of a jet radiant composite heating/soaking apparatus according to the present invention;
fig. 34 is a perspective view of a radiant tube in an embodiment of the jet radiant composite 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 derived and expanded, only some embodiments are given in this example, and other embodiments are given in the present invention, even if all the group patent examples are given only some embodiments, various combinations generated by selecting or not selecting the optional stations or segments 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. 2, an embodiment 1 of the present invention is shown, in the embodiment 1, the ultra-short flow ultra-high strength strip steel production line of the present invention includes the following stations in order: uncoiling, welding, inlet looping, central continuous post-treatment, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises a rapid heating station, a soaking station and a rapid cooling station;
the rapid heating station adopts an air jet radiation composite heating device;
the soaking station adopts radiant tube soaking equipment or jet-air radiation composite soaking equipment;
the rapid cooling station adopts high-hydrogen cooling equipment.
Referring to fig. 3, an embodiment 2 of the present invention is shown, and in the embodiment 2, the ultra-short flow ultra-high strength strip steel production line of the present invention includes the following stations in order: uncoiling, welding, inlet looping, central continuous post-treatment, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises a rapid heating station, a soaking station and a rapid cooling station;
the rapid heating station adopts an air jet radiation composite heating device;
the soaking station adopts radiant tube soaking equipment or jet-air radiation composite soaking equipment;
the rapid cooling station adopts aerosol cooling equipment.
Referring to fig. 4, an embodiment 3 of the present invention is shown, and in the embodiment 3, the ultra-short flow ultra-high strength strip steel production line of the present invention includes the following stations in order: uncoiling, welding, inlet looping, central continuous post-treatment, outlet looping and coiling; wherein,
the central continuous post-treatment station sequentially comprises a rapid heating station, a soaking station and a rapid cooling station;
the rapid heating station adopts an air jet radiation composite heating device;
the soaking station adopts radiant tube soaking equipment or jet-air radiation composite soaking equipment;
the rapid cooling station adopts water quenching cooling equipment.
Referring to fig. 5, an embodiment 4 of the present invention is shown, in embodiment 4, the rapid heating station is arranged in series with a transverse magnetic induction heating device by using a jet radiation composite heating device, and the rapid cooling station is arranged in series or parallel with a water quenching cooling device by using an aerosol cooling device.
Referring to fig. 6, an embodiment 5 of the present invention is shown, in embodiment 5, the rapid heating station is arranged in series with a transverse magnetic induction heating device by using a jet radiation composite heating device, and the rapid cooling station is arranged in parallel with a water quenching cooling device by using a high hydrogen cooling device.
Referring to fig. 7, an embodiment 6 of the present invention is shown, in embodiment 6, the rapid heating station is arranged in series with a transverse magnetic induction heating device by using a jet radiation composite heating device, and the rapid cooling station is arranged in parallel with an aerosol cooling device by using a high hydrogen cooling device.
Referring to fig. 8, an embodiment 7 of the present invention is shown, in embodiment 7, the rapid heating station is arranged in series with the transverse magnetic induction heating device by using a jet radiation composite heating device, and the rapid cooling station is arranged in parallel with the gas mist cooling device by using a high hydrogen cooling device, a water quenching cooling device, and the gas mist cooling device is arranged in series with the water quenching cooling device.
Referring to fig. 9-15, which illustrate embodiments 8-14 of the present invention, embodiments 8-14 are based on embodiments 1-7, with an optional cleaning station disposed between the welding station and the inlet looper station, respectively.
Referring to fig. 16 to 22, embodiments 15 to 21 of the present invention are shown, and embodiments 15 to 21 are based on embodiments 1 to 7, in which the rapid heating station uses a jet radiation composite heating device and a transverse magnetic induction heating device arranged in series to perform rapid heating.
Referring to fig. 23 to 29, which show embodiments 22 to 28 of the present invention, embodiments 22 to 28 are based on embodiments 1 to 7, the rapid heating station is further arranged in series by adopting an optional longitudinal magnetic induction heating device and a jet radiation composite heating device+a transverse magnetic induction heating device which are arranged in series, and the strip steel can be heated by the longitudinal magnetic induction heating device first or by-passing the longitudinal magnetic induction heating device and directly entering the jet radiation composite heating device+the transverse magnetic induction heating device which are arranged in series.
Referring to fig. 30 to 34, 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
As shown in fig. 2, the strip steel is uncoiled and welded and then enters an inlet loop, then is heated to 780 ℃ by jet radiation recombination, is soaked by jet radiation recombination at 780 ℃, is cooled to room temperature by high hydrogen, enters an outlet loop, and is coiled finally, so that the production is completed.
Example 2
As shown in fig. 3, the main chemical components (mass%) of the substrate are: uncoiling and welding strip steel with 0.095% of C-0.05% of Si-1.88% of Mn, entering an inlet loop, carrying out jet-air radiation composite heating to 820 ℃, soaking a radiant tube for 40 seconds, cooling the aerosol to 250 ℃, naturally cooling to room temperature, entering an outlet loop, and coiling to finish production. The yield strength of the final product strip steel is 710MPa, the tensile strength is 993MPa, and the breaking elongation is 9%.
Example 3
As shown in fig. 4, the strip steel is uncoiled and welded and then enters an inlet loop, then is heated to 800 ℃ by jet radiation recombination, is soaked by jet radiation recombination at 800 ℃, is cooled to room temperature by water quenching, enters an outlet loop, and is coiled finally, so that the production is completed.
Example 4
As shown in fig. 5, the strip steel is uncoiled and welded and then enters an inlet loop, then is heated to 800 ℃ by jet radiation recombination, is soaked by jet radiation recombination at 800 ℃, is cooled to room temperature by water quenching, enters an outlet loop, and is coiled finally, so that the production is completed.
Example 5
As shown in fig. 6, the strip steel is uncoiled and welded and then enters an inlet loop, then is heated to 820 ℃ by adopting jet radiation compounding, is soaked by adopting jet radiation compounding at 820 ℃, can be cooled to room temperature by high hydrogen optionally, can be cooled to room temperature by water quenching optionally, then enters an outlet loop, and is coiled finally, so that the production is completed.
Example 6
As shown in fig. 7, the strip steel is uncoiled and welded and then enters an inlet loop, then is heated to 850 ℃ by jet radiation in a combined mode, is soaked by jet radiation in a combined mode at 850 ℃, and can be cooled to room temperature by high hydrogen or aerosol, then enters an outlet loop and is coiled finally, so that the production is completed.
Example 7
As shown in fig. 8, the strip steel is uncoiled and welded and then enters an inlet loop, then is heated to 870 ℃ by jet radiation in a combined mode, is soaked by jet radiation in a combined mode at 870 ℃, can be cooled to room temperature by high hydrogen, can be cooled to room temperature by aerosol, can be cooled to room temperature by water quenching, then enters an outlet loop, and is coiled finally, and the production is completed.
Example 8
As shown in fig. 9, the strip steel can be optionally cleaned before entering the inlet loop after uncoiling and welding, or can be optionally directly entering the inlet loop, then the strip steel is heated to 815 ℃ by jet radiation in a combined mode, soaked by jet radiation in the 815 ℃, then the strip steel is cooled to room temperature by high hydrogen, enters the outlet loop, and finally is coiled to finish production.
Example 9
As shown in fig. 10, the main chemical components (mass%) of the substrate are: the strip steel with 0.095 percent of C-0.05 percent of Si-1.88 percent of Mn can be optionally cleaned before entering the inlet loop after uncoiling and welding, or can be optionally directly entering the inlet loop, the strip steel is heated to 825 ℃ through jet radiation in a combined mode, then the radiating pipe is soaked for 50 seconds, then the aerosol is cooled to 235 ℃ and then naturally cooled to room temperature, enters the outlet loop, and is coiled to finish production. The final product band steel has the yield strength of 775MPa, the tensile strength of 1053MPa and the elongation at break of 7 percent.
Example 10
As shown in FIG. 11, the strip steel can be optionally cleaned before entering the inlet loop after uncoiling and welding, or can be optionally directly entering the inlet loop, then the strip steel is heated to 805 ℃ by jet radiation in a combined mode, soaked by the jet radiation at 805 ℃, then quenched by water and cooled to room temperature, enters the outlet loop, and finally coiled to finish production.
Example 11
As shown in fig. 12, the strip steel can be optionally cleaned before entering the inlet loop after uncoiling and welding, or can be optionally directly entering the inlet loop, then the strip steel is heated to 825 ℃ by adopting jet radiation compounding, soaking is carried out by jet radiation compounding at 825 ℃, then the strip steel is cooled to room temperature by water quenching, enters the outlet loop, and finally is coiled to finish production.
Example 12
As shown in fig. 13, the strip steel can be optionally cleaned before entering the inlet loop after uncoiling and welding, or can be optionally directly entering the inlet loop, then the strip steel is heated to 835 ℃ by adopting jet radiation compounding, soaking is carried out by adopting jet radiation compounding at 835 ℃, high hydrogen can be optionally cooled to room temperature, or water quenching can be optionally carried out to be cooled to room temperature, then the strip steel enters the outlet loop, and finally coiling is carried out, so that the production is completed.
Example 13
As shown in fig. 14, the strip steel can be optionally cleaned before entering the inlet loop after uncoiling and welding, or can be optionally directly entering the inlet loop, then the strip steel is heated to 855 ℃ by adopting jet radiation in a combined mode, soaking is carried out by adopting jet radiation in a combined mode at 855 ℃, high hydrogen can be optionally cooled to room temperature, or an aerosol can be optionally cooled to room temperature, then the strip steel enters the outlet loop, and finally coiling is carried out to finish production.
Example 14
As shown in fig. 15, the strip steel is uncoiled and welded and then enters an inlet loop, then is heated to 870 ℃ by jet radiation in a combined mode, is soaked by jet radiation in a combined mode at 870 ℃, can be cooled to room temperature by high hydrogen, can be cooled to room temperature by aerosol, can be cooled to room temperature by water quenching, then enters an outlet loop, and is coiled finally, and the production is completed.
Example 15
As shown in fig. 16, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is firstly heated to 780 ℃ by jet radiation in a combined mode, then heated to 880 ℃ by transverse magnetic induction, is subjected to jet radiation in a combined mode for soaking at 880 ℃, then is cooled to room temperature by high hydrogen, enters an outlet loop, and finally is coiled to finish production.
Example 16
As shown in fig. 17, the main chemical components (mass%) of the substrate are: strip steel with 0.095 percent of C-0.05 percent of Si-1.88 percent of Mn enters an inlet loop after uncoiling and welding, the strip steel is heated to 820 ℃ by jet radiation in a combined mode, then is heated to 920 ℃ by transverse magnetic induction, then is soaked for 40 seconds by a radiant tube, is naturally cooled to room temperature after being cooled to 250 ℃, enters an outlet loop, and is coiled to finish production. The yield strength of the final product strip steel is 765MPa, the tensile strength is 1043MPa, and the elongation at break is 8%.
Example 17
As shown in fig. 18, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is firstly heated to 800 ℃ by jet radiation in a combined mode, then heated to 900 ℃ by transverse magnetic induction, is subjected to jet radiation in a combined mode to soak at 900 ℃, is cooled to room temperature by water quenching, enters an outlet loop, and is finally coiled to finish production.
Example 18
As shown in fig. 19, the strip steel enters an inlet loop after uncoiling and welding, the strip steel is heated to 800 ℃ by jet radiation in a combined mode, then is heated to 900 ℃ by transverse magnetic induction, is cooled to room temperature by water quenching, enters an outlet loop, and is coiled finally, and the production is completed.
Example 19
As shown in fig. 20, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is firstly heated to 820 ℃ by jet radiation in a combined mode, then is heated to 920 ℃ by transverse magnetic induction, optionally high hydrogen is cooled to room temperature, optionally water quenching is cooled to room temperature, then enters an outlet loop, and finally is coiled, so that the production is completed.
Example 20
As shown in fig. 21, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is firstly subjected to air injection radiation composite heating to 750 ℃, then subjected to transverse magnetic induction heating to 850 ℃, optionally high hydrogen is cooled to room temperature, optionally aerosol is cooled to room temperature, then enters an outlet loop, and finally is coiled, so that the production is completed.
Example 21
As shown in fig. 22, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is firstly heated to 770 ℃ by jet radiation in a combined mode, then heated to 870 ℃ by transverse magnetic induction, and is subjected to jet radiation in a combined soaking mode at 870 ℃, high hydrogen can be selected to be cooled to room temperature, aerosol can be selected to be cooled to room temperature, water quenching can be selected to be cooled to room temperature, then enters an outlet loop, and finally coiled to finish production.
Example 22
As shown in fig. 23, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is longitudinally heated to 420 ℃, then is subjected to air injection radiation composite heating to 780 ℃, then is subjected to transverse magnetic induction heating to 880 ℃, is subjected to air injection radiation composite soaking at 880 ℃, then is subjected to high hydrogen cooling to room temperature, enters an outlet loop, and is coiled to finish production.
EXAMPLE 23
As shown in fig. 24, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is longitudinally heated to 450 ℃, then is subjected to air injection radiation composite heating to 820 ℃, then is subjected to transverse magnetic induction heating to 920 ℃, then is soaked in a radiant tube for 40 seconds, then is naturally cooled to room temperature after being cooled to 250 ℃, enters an outlet loop, and is coiled to finish production.
EXAMPLE 24
As shown in fig. 25, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is longitudinally heated to 400 ℃, then is subjected to air injection radiation composite heating to 800 ℃, then is subjected to transverse magnetic induction heating to 900 ℃, is subjected to air injection radiation composite soaking at 900 ℃, is cooled to room temperature by water quenching, enters an outlet loop, and is coiled to finish production.
Example 25
As shown in fig. 26, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is longitudinally heated to 480 ℃, then is subjected to air jet radiation composite heating to 820 ℃, then is subjected to transverse magnetic induction heating to 900 ℃, then is cooled to room temperature by water quenching, enters an outlet loop, and finally is coiled to finish production.
EXAMPLE 26
As shown in fig. 27, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is longitudinally heated to 350 ℃, then is subjected to air injection radiation composite heating to 840 ℃, then is subjected to transverse magnetic induction heating to 920 ℃, and optionally high hydrogen is cooled to room temperature, optionally water quenching is carried out to room temperature, then enters an outlet loop, and finally is coiled to finish production.
Example 27
As shown in fig. 28, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is longitudinally heated to 410 ℃, then is subjected to air injection radiation composite heating to 700 ℃, then is subjected to transverse magnetic induction heating to 850 ℃, high hydrogen can be selected to be cooled to room temperature, or an aerosol can be selected to be cooled to room temperature, then enters an outlet loop, and finally is coiled to finish production.
EXAMPLE 28
As shown in fig. 29, the strip steel is uncoiled and welded and then enters an inlet loop, the strip steel is longitudinally heated to 500 ℃, then is subjected to air jet radiation composite heating to 800 ℃, then is subjected to transverse magnetic induction heating to 930 ℃, and is subjected to air jet radiation composite soaking at 930 ℃, high hydrogen can be selected to be cooled to room temperature, air mist can be selected to be cooled to room temperature, water quenching can be selected to be cooled to room temperature, then enters an outlet loop, and finally is coiled to finish production.
The invention increases the demands of the current ultra-high strength steel market year by year and aims at CO 2 Under the situation that NOx emission is gradually and strictly limited, the method has very wide application prospect, and particularly has wider popularization and application prospect in urban steel plants.
Claims (10)
1. The ultra-short flow ultra-high strength strip steel production line is characterized by sequentially comprising the following stations: uncoiling, welding, inlet looping, central continuous post-treatment, outlet looping and coiling; the central continuous post-treatment station sequentially comprises a rapid heating station, a soaking station and a rapid cooling station;
the rapid heating station adopts an air jet radiation composite heating device;
the soaking station adopts radiant tube soaking equipment, jet-air radiation composite soaking device, electric radiant tube soaking equipment, resistance wire soaking equipment or resistance belt soaking equipment;
the rapid cooling station adopts high-hydrogen cooling equipment, aerosol cooling equipment or water quenching cooling equipment.
2. The ultra-short flow ultra-high strength strip steel production line according to claim 1, wherein the rapid heating station is arranged in series by adopting an air jet radiation composite heating device and a transverse magnetic induction heating device, and the rapid cooling station is arranged in series or in parallel by adopting an air mist cooling device and a water quenching cooling device, or in parallel by adopting a high hydrogen cooling device and an air mist cooling device, or in parallel by adopting a high hydrogen cooling device, an air mist cooling device and a water quenching cooling device.
3. The ultra-short flow ultra-high strength strip steel production line according to claim 1 or 2, wherein an optional cleaning station is provided between the welding station and the inlet looper station.
4. The ultra-short flow ultra-high strength strip steel production line according to claim 1, 2 or 3, wherein the rapid heating station adopts a jet radiation composite heating device and a transverse magnetic induction heating device which are arranged in parallel and can be selected, and the strip steel can be heated by the jet radiation composite heating device and the transverse magnetic induction heating device which are arranged in series after passing through the direct fire heating device, or can be directly heated by bypassing the direct fire heating device and entering the jet radiation composite heating device and the transverse magnetic induction heating device which are arranged in series.
5. The ultra-short flow ultra-high strength strip steel production line according to any one of claims 1 to 4, wherein the rapid heating station adopts a mode that selectable longitudinal magnetic induction heating equipment is arranged in parallel or in series with jet radiation composite heating devices and transverse magnetic induction heating devices which are arranged in series, strip steel can be heated by the longitudinal magnetic induction heating equipment, and can bypass and skip the longitudinal magnetic induction heating equipment to directly enter the jet radiation composite heating devices and transverse magnetic induction heating devices which are arranged in series for heating.
6. The ultra-short flow ultra-high strength strip steel production line according to any one of claims 1 to 5, wherein an optional cleaning station is provided after the inlet looper station.
7. The ultra-short flow ultra-high strength strip steel production line according to any one of claims 1 to 6, wherein an optional pickling section is arranged before the coiling station and after the central continuous post-treatment station; preferably, an optional flash plating section is arranged after the pickling section and before the coiling station.
8. The ultra-short flow ultra-high strength strip steel production line according to any one of claims 1 to 7, wherein a leveling station is provided before the coiling station.
9. The ultra-short flow ultra-high strength strip steel production line according to any one of claims 1 to 8, wherein a finishing station is provided between the coiling station and the flattening station.
10. A jet-radiation composite heating/soaking device for an ultra-short flow ultra-high strength strip steel production line according to any one of claims 1 to 9, characterized by 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-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 |
|---|---|---|---|
| CN202211122426.5A CN117737397A (en) | 2022-09-15 | 2022-09-15 | Ultra-short flow ultra-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 |
|---|---|---|---|
| CN202211122426.5A CN117737397A (en) | 2022-09-15 | 2022-09-15 | Ultra-short flow ultra-high strength strip steel production line |
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| CN117737397A true CN117737397A (en) | 2024-03-22 |
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| CN202211122426.5A Pending CN117737397A (en) | 2022-09-15 | 2022-09-15 | Ultra-short flow ultra-high strength strip steel production line |
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- 2022-09-15 CN CN202211122426.5A patent/CN117737397A/en active Pending
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