CN117339999A - Hot rolling-on-line solid solution-on-line pickling integrated process and production line of medium plate stainless steel - Google Patents
Hot rolling-on-line solid solution-on-line pickling integrated process and production line of medium plate stainless steel Download PDFInfo
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- CN117339999A CN117339999A CN202311344718.8A CN202311344718A CN117339999A CN 117339999 A CN117339999 A CN 117339999A CN 202311344718 A CN202311344718 A CN 202311344718A CN 117339999 A CN117339999 A CN 117339999A
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- 238000005554 pickling Methods 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 52
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 50
- 239000010935 stainless steel Substances 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 49
- 239000007787 solid Substances 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 172
- 239000010959 steel Substances 0.000 claims abstract description 172
- 238000005096 rolling process Methods 0.000 claims abstract description 92
- 238000001816 cooling Methods 0.000 claims abstract description 76
- 239000006104 solid solution Substances 0.000 claims abstract description 58
- 239000002253 acid Substances 0.000 claims abstract description 41
- 238000005520 cutting process Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000005422 blasting Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000004321 preservation Methods 0.000 claims abstract description 18
- 239000013589 supplement Substances 0.000 claims abstract description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 24
- 238000010791 quenching Methods 0.000 claims description 23
- 230000000171 quenching effect Effects 0.000 claims description 22
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 20
- 229910017604 nitric acid Inorganic materials 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 20
- 230000002441 reversible effect Effects 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 230000011218 segmentation Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000004513 sizing Methods 0.000 claims 1
- 238000003860 storage Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 11
- 239000000047 product Substances 0.000 abstract description 7
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000002918 waste heat Substances 0.000 description 16
- 238000009749 continuous casting Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000011010 flushing procedure Methods 0.000 description 9
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 230000009467 reduction Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011973 solid acid Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
-
- 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
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
A hot rolling-on-line solid solution-on-line acid cleaning integrated process and production line of a medium plate stainless steel comprises the following steps: 1) Heating the stainless steel plate blank by a heating furnace at 1200-1300 ℃ for 2.5-3.5 h; then dephosphorizing with high-pressure water; rolling for multiple passes by a rolling mill, rolling to a target thickness, and thermally straightening and sectionally cutting into steel plates; 2) The steel plate with the residual temperature of above 850 ℃ is conveyed to a solid solution furnace on line for heat supplement, the steel plate is subjected to heat supplement to the solid solution temperature of 1050-1150 ℃ and the heat preservation time is 1-10 min, and then is cooled to 60-90 ℃ through water cooling or air cooling; 3) Straightening, cutting to length and shot blasting the steel plate, carrying out on-line pickling on the steel plate with residual temperature of 50-80 ℃, removing oxide skin on the surface of the steel plate, and then taking off the steel plate and warehousing. The invention not only reduces the production energy consumption by more than 30 percent and the acid consumption by more than 25 percent, but also reduces the production period of the medium plate stainless steel product from more than 24 hours to less than 4 hours, thereby greatly improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of medium plate stainless steel, in particular to a hot rolling-on-line solid solution-on-line pickling integrated process and production line of the medium plate stainless steel.
Background
The medium-thickness stainless steel is a stainless steel plate with the thickness of more than 4.5mm, is widely applied to the industrial fields of petroleum, chemical industry, nuclear power, ships, mechanical equipment and the like, and has wide market prospect.
At present, the medium plate stainless steel is mainly produced in an off-line mode and comprises the following components:
(1) Heating and dephosphorizing a plate blank, rolling to a target thickness, straightening and cutting into a steel plate to a fixed length after laminar cooling, and cooling to room temperature on a cooling bed;
(2) The steel plate is lifted to an annealing furnace, reheated to 1050-1150 ℃ from room temperature, kept warm for a period of time, then enters a quenching machine, is rapidly cooled to room temperature, and is stored in a cooling bed for subsequent pickling;
(3) And lifting the steel plate to an acid pickling line, straightening, shot blasting, and then acid pickling to remove surface oxide skin.
After the rolling of the stainless steel plate is finished, the temperature is generally up to 950 ℃, the temperature is still above 500 ℃ after laminar cooling, and the cooling to the room temperature on a cooling bed at least needs more than 24 hours, so that the heat source is wasted, the production period is long, and the energy conservation, the consumption reduction, the cost reduction and the efficiency enhancement of enterprises are seriously restricted.
In addition, the temperature of the annealed steel plate after solid solution reaches 1050-1150 ℃, the steel plate is rapidly cooled to room temperature by a quenching machine, and the waste heat of the steel plate is wasted.
In order to solve the energy waste in the production process of the medium plate stainless steel, reduce the carbon emission of ton steel and realize the purposes of energy conservation, consumption reduction, cost reduction and efficiency improvement of enterprises, a plurality of domestic patents provide solutions.
Chinese patent publication No. CN111676355B discloses an on-line solution treatment process for austenitic stainless steel sheet, and the main production process flow of the patent is: heating continuous casting blank, dephosphorizing with high-pressure water, rough rolling, finish rolling, softening treatment, ultra-fast cooling, straightening, shearing to a certain extent, shot blasting and pickling. The process fully utilizes the rolling waste heat, and does not need an additional solid solution process. Compared with the conventional steel plate rolling process, the steel plate needs to be subjected to softening treatment after rolling is finished, so that the deformed austenite is fully softened before cooling. And after softening treatment, ultra-fast cooling is carried out, the steel plate is cooled from more than 800 ℃ to less than 430 ℃, and the influence on the corrosion resistance of the stainless steel caused by poor chromium among crystals due to massive precipitation of high-chromium carbide is prevented. The patent fully utilizes the rolling waste heat of the steel plate to realize on-line solution treatment, but in order to realize full softening, the steel plate needs to swing for 10-200 s after a finishing mill, and therefore, a heating furnace plate blank cannot be immediately tapped and rolled, and the smooth production of hot rolling is not favored. In addition, this patent fails to utilize the residual heat at 430 ℃ after the solid solution, but cools to room temperature for the subsequent pickling, and fails to fully utilize the residual heat after the solid solution by connecting the solid solution process and the pickling process in series.
Chinese patent publication No. CN115029531a discloses an on-line solution treatment method for medium plate stainless steel, which comprises the following two processes: the preferred process flow is as follows: when the finishing temperature is higher than the finishing process requirement, adopting the rapid rolling of the steel plate at the first temperature and the rapid cooling of the steel plate in on-line equipment; alternative process flow: when the final rolling temperature is lower than the final rolling process requirement, the steel plate is rolled quickly at a first temperature, enters an online solid solution furnace for short-time heat preservation, removes phosphorus on the surface and enters online equipment for quick cooling. The invention is similar to the above-mentioned CN111676355B patent, the rolling waste heat of the steel plate is fully utilized to realize on-line solid solution treatment or enter an on-line solid solution furnace to slightly complement heat, so that the mechanical property, hardness, impact property, grain size, corrosion resistance, metallographic structure, surface quality and the like of the produced on-line solid solution product completely meet the standard requirements, and the on-line solid solution product is equivalent to or slightly superior to the conventional off-line treatment level. However, the patent also fails to fully utilize the residual heat after solid solution, and the steel sheet is cooled to room temperature for subsequent pickling, and fails to fully utilize the residual heat after solid solution by connecting the solid solution process and the pickling process in series.
Chinese patent publication No. CN103447321B discloses a process for pickling stainless steel plate with mixed acid at a temperature of plate strip, which comprises shot blasting, pre-flushing, pre-pickling, flushing, and final pickling steps, wherein flushing medium in the pre-flushing step and flushing step is water at 40-65 ℃. Compared with the conventional pickling process of flushing with room temperature water, the stainless steel plate is heated to 40-65 ℃ in the process of pre-flushing and flushing the steel plate by the high temperature water, so that the reaction speed of oxide skin on the surface of the steel plate and acid liquor at 50-55 ℃ is accelerated, the stainless steel plate is subjected to online rapid continuous pickling, and the pickling time is shortened. The patent achieves the aim of heating the steel plate through high-temperature water flushing, shortens the pickling time, but still consumes extra energy to obtain the high-temperature water, and cannot be connected with a solvus in series, so that the steel plate has high temperature. And this patent only proposes improvement measures for the pickling line, failing to utilize the rolling waste heat of the hot rolled line steel sheet.
In summary, the existing off-line production modes of hot rolling, solid solution and acid washing of the medium-thickness stainless steel and domestic related patents cannot simultaneously utilize the waste heat after rolling and solid solution of the steel plate, so that the purposes of reducing energy consumption, acid consumption and production period are achieved. And the existing stainless steel medium plate offline production mode has the highest energy consumption and the longest production period.
Disclosure of Invention
The invention aims to provide a hot rolling-on-line solid solution-on-line acid washing integrated process and production line for medium plate stainless steel, which fully utilizes the waste heat after rolling and solid solution of a steel plate and realizes the purposes of low energy consumption, low acid consumption and short production period for the production of the medium plate stainless steel; moreover, the aim of rolling the steel plate with the thickness of less than 8mm by the heavy and medium plate mill is also fulfilled.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the hot rolling-on-line solid solution-on-line pickling integrated process for the medium plate stainless steel comprises the following steps:
1) Heating the stainless steel plate blank by a heating furnace at 1200-1300 ℃ for 2.5-3.5 h; then high-pressure water dephosphorization is carried out to remove iron scales on the surface of the stainless steel slab; rolling to the target thickness after multi-pass rolling, and then thermally straightening and sectionally cutting into steel plates with certain lengths, wherein the lengths of the steel plates are not too long, otherwise, the lengths of the steel plates exceed the lengths of the steel pushing roller paths and cannot be pushed to the other two parallel production lines; the length of the steel plate is not too short, otherwise, too much workload of a cutting machine affects the hot rolling efficiency;
2) Feeding the steel plate with the residual temperature above 850 ℃ into a solid solution furnace for heat supplement, wherein the steel plate is subjected to heat supplement to the solid solution temperature of 1050-1150 ℃ and the heat preservation time of 1-10 min, and then cooling to the target temperature of 60-90 ℃ through water cooling or air cooling;
3) And (3) straightening, cutting to a fixed length, shot blasting, and finally carrying out an on-line pickling process on the steel plate with the residual temperature of 50-80 ℃ by using a conveying roller, removing oxide skin on the surface of the steel plate, and then carrying out off-line warehousing.
Preferably, the rolling in step 1) is performed by a reversing mill.
Preferably, the step 1) adopts a reversible rolling mill for rolling, and a steckel mill is started when the steel plate with the thickness of less than 8mm is rolled.
Preferably, in step 3), the acid liquid for pickling is composed of nitric acid and hydrofluoric acid; wherein the concentration of nitric acid is 100-200 g/L, the concentration of hydrofluoric acid is 15-35 g/L, and the temperature of mixed acid is 45-60 ℃.
The hot rolling-on-line solid solution-on-line pickling integrated process of the medium plate stainless steel fully utilizes the waste heat of the rolled steel plate, the temperature of the waste heat of the steel plate after sectional cutting is above 850 ℃, the steel plate enters a solid solution furnace to be complemented to the solid solution temperature of 1050-1150 ℃, and the heat preservation time is 1-10 min.
And the existing stainless steel medium plate produced by off-line solid solution is lifted to an annealing furnace, and is heated from room temperature to 1050-1150 ℃ of solid solution temperature, the heat preservation time is 15-60 min, and the heat preservation time is determined by the thickness of the plate.
Therefore, compared with the existing offline solid solution production, the online solid solution production process greatly shortens the solid solution time, improves the solid solution efficiency by more than 5 times, and saves the energy consumption by more than 30 percent.
Particularly, the invention fully utilizes the waste heat after the steel plate is in solid solution, the steel plate is quickly cooled to avoid carbide precipitation after being in solid solution, the steel plate is cooled to the target temperature of 60-90 ℃, then the steel plate with the waste heat is subjected to shot blasting treatment after being subjected to cold straightening and fixed-length cutting in sequence, and then the steel plate is subjected to on-line pickling at the temperature of 50-80 ℃, so that the reaction speed of the surface of the steel plate and acid liquor is accelerated, and further the acid concentration and the acid consumption can be reduced.
The invention researches the influence of the residual temperature and the nitric acid concentration of the steel plate on the quality of the pickling surface.
Taking 304 stainless steel as an example, when the steel plate is completely cooled to room temperature of 20 ℃, the nitric acid concentration is required to be at least 150g/L to enable the surface residual rust to be washed cleanly. As the residual temperature of the steel plate is higher, the required nitric acid concentration gradually decreases, and when the residual temperature of the steel plate is 80 ℃, the required nitric acid concentration is only 100g/L (see fig. 1), which is 66.7% of the nitric acid concentration at the room temperature of the steel plate, and 33.3% of nitric acid can be saved. However, the residual temperature of the steel plate is not too high, nitric acid is accelerated to volatilize into nitrogen oxides at a temperature exceeding 80 ℃, and the steel plate is harmful to human bodies. Therefore, the target temperature after quenching is set to be 60-90 ℃, and the residual temperature is ensured to be kept at 50-80 ℃ when the steel plate enters the acid tank.
The invention also provides a production line for the hot rolling-on-line solid solution-on-line pickling integrated process of the medium plate stainless steel, which sequentially comprises the following steps: heating furnace, high-pressure water dephosphorization device, rolling mill, straightener, segmentation cutting machine, solid solution furnace, cooling equipment, cold straightening machine, scale cutting machine, shot-blasting machine, pickling equipment.
Preferably, the rolling mill is a reversible rolling mill.
Preferably, the rolling mill is a reversible rolling mill, and a steckel mill, more preferably a steckel mill with a heating device, is arranged in front of and behind the rolling mill.
Preferably, the cooling device is a quenching machine.
Preferably, three solid solution furnaces, cooling equipment, shot blasting machines, straightening machines and pickling equipment are respectively arranged to form three annealing, quenching, cold straightening machines, fixed-length cutting machines, shot blasting and pickling production lines which are arranged in parallel; correspondingly, a steel pushing roller way is arranged at the outlet roller way of the sectional cutting machine and corresponds to the conveying roller ways of the three production lines.
In the design of the integrated production line, laminar cooling, lifting equipment and the like arranged in an off-line solid solution production line are omitted, cooling equipment (quenching machine) is arranged behind a solid melting furnace, so that the temperature of a steel plate is reduced to 60-90 ℃, the temperature requirement of on-line pickling is met, and the solid solution line and the pickling line are connected in series, so that the hot rolling-on-line solid solution-on-line pickling integrated process is realized, the production efficiency is greatly improved, and meanwhile, the energy consumption, the acid consumption and the like are greatly reduced.
As the optimal selection, the invention is provided with a steckel mill at the front and the back of the rolling mill, when the steel plate with the thickness of less than 8mm is rolled, the steel plate can enter the steckel mill for heat preservation, the uniformity of the temperature distribution of the steel plate is improved, the defect of too fast cooling of the steel plate when the traditional heavy and medium plate rolling mill rolls the thin plate is overcome, and the aim of rolling the steel plate with the thickness of less than 8mm by the heavy and medium plate rolling mill is realized.
Preferably, a segment cutting machine is newly added behind the hot straightening machine, and the steel plate is transferred to three solid solution lines through a steel pushing roller path in time, so that the high-efficiency production of hot rolling is ensured; the quenching machine is arranged behind the solid melting furnace to cool the steel plate to 60-90 ℃, thereby meeting the temperature requirement of on-line pickling, connecting the solid melting line and the pickling line in series, realizing the hot rolling-on-line solid solution-on-line pickling integrated process, greatly improving the production efficiency, and greatly reducing the energy consumption, the acid consumption and the like. Taking 100 ten thousand tons of stainless steel medium plates produced in one year as an example, the production efficiency is more than 3 times that of the existing off-line production equipment, and meanwhile, the waste heat after rolling and solid solution of the steel plates is fully utilized, so that the double reduction of energy consumption and acid consumption is realized.
Compared with the prior art, the invention has the advantages that:
in the hot rolling-on-line solid solution-on-line pickling integrated process, the hot rolled steel plate does not need to be cooled from 950 ℃ to room temperature, and compared with the prior art that the temperature is reduced from 950 ℃ to room temperature for more than 20 hours, the process saves the cooling time by more than 20 hours; meanwhile, the solution treatment can be completed without reheating from room temperature to the solution temperature by fully utilizing the rolling waste heat to enter a solution furnace for slightly compensating, and compared with the prior art with the heat preservation time of 15-60 min, the heat preservation time of the process only needs 1-10 min, the heat preservation time is reduced by more than 70%, the solution efficiency is greatly improved, and the energy consumption is saved by more than 30%.
And the steel plate is subjected to solution quenching and then has a residual temperature of 60-90 ℃, and through the solution-acid washing integrated design, the steel plate is timely and rapidly acid-washed, the heat loss of the steel plate is reduced, the final strip temperature of the steel plate is ensured to be 50-80 ℃ for acid washing, and compared with the prior art, the steel plate is quenched to room temperature and then is lifted to a pickling tank for acid washing through a lifting device, the acid washing efficiency can be improved by more than 50%, and the acid consumption is reduced by about 33%.
In addition, in the hot rolling-on-line solid solution-on-line pickling integrated production line, a steckel mill is respectively arranged in front of and behind the rolling mill, when the thickness of a steel plate is less than 8mm, the steel plate can enter the steckel mill for heat preservation, the temperature distribution uniformity of the steel plate is improved, the defect of too fast cooling when the traditional heavy and medium plate rolling mill rolls the thin plate is overcome, and the aim of rolling the steel plate with the thickness less than 8mm by the heavy and medium plate rolling mill is fulfilled.
Compared with the Chinese patent CN111676355B, the Chinese patent CN111676355B also realizes on-line solution treatment by utilizing the rolling waste heat of the steel plate, but in order to realize full softening, the steel plate needs to swing for 10-200 s after a finishing mill, the rolling completion time of each plate blank is 3-5 min on average, and the temperature reduction rate of the thin plate is high, and the effect of fully softening and dissolving the steel plate cannot be realized even though a heat preservation cover is added in a softening area, so that the Chinese patent CN111676355B cannot realize the production purpose of the thin plate.
The process of the invention realizes the rolling of the sheet with the thickness below 8mm by arranging a steckel mill at the front and the back of the rolling mill respectively for heat preservation and improving the uniformity of the temperature distribution of the steel plate. After rolling, the steel is not required to be put behind the rolling mill, and a heat preservation cover is not required to be additionally arranged to reduce the cooling rate of the steel plate, but the steel is connected with a solid melting furnace through a steel putting roller way to realize heat compensation so as to fully soften the tissue. The process of the invention has the average rolling completion time of each plate blank of 2-3 min and higher production efficiency.
In addition, after softening treatment, chinese patent CN111676355B, in order to quickly pass through a carbide precipitation temperature range of 850-500 ℃, unlike the conventional laminar cooling apparatus, adds a new ultra-fast cooling high-pressure jet water cooling apparatus, which aims to completely avoid carbide precipitation, but for thick steel plates, the steel plates cannot meet the cooling temperature requirement by passing through the ultra-fast cooling area once, and still need to be cooled by a swinging mode, although the cooling rate of the central area of the thick plate is still much slower than the surface layer, carbide precipitation in the central area of the thick plate may not be avoided. While conventional laminar cooling does not necessarily require cooling temperatures, carbide can still be decomposed by subsequent off-line solid solution.
Unlike the traditional laminar cooling and the ultra-fast cooling mode of Chinese patent CN111676355B, the cooling device does not need to cool after rolling, but enters a cooling device-a quenching machine to realize fast cooling after a solid melting furnace, and the cooling mode is not only suitable for thin-specification steel plates, but also suitable for thick-specification steel plates, and has simple cooling process and smaller occupied area of the quenching machine.
Finally, after the cooling process, the steel plate below 430 ℃ is lifted to a cooling bed to be cooled to room temperature and then is subjected to off-line pickling, and the on-line solid solution and the pickling cannot be connected in series, so that the full utilization of the solid solution waste heat is realized, and the purpose of rapid pickling is achieved.
In the invention, the steel plate is provided with the residual temperature of 60-90 ℃ after passing through the cooling equipment-quenching machine, and the steel plate is timely and rapidly pickled through the integrated design of the solid solution-pickling production line, so that the heat loss of the steel plate is reduced, the final pickling at the temperature of 50-80 ℃ of the steel plate is ensured, the pickling efficiency is improved by more than 50%, and the acid consumption is reduced by about 33%. The most important ring is the use of a cooling device, namely a quenching machine, so that the steel plate can be rapidly cooled from the solid solution temperature to 60-90 ℃. The Chinese patent CN111676355B only can realize the aim of cooling to about 430 ℃ due to the use of high-pressure jet cooling, and the rubber roller of the pickling line cannot bear the high temperature of more than 100 ℃, so that the patent cannot realize the online solid solution-online pickling process.
Drawings
FIG. 1 is a graph showing the effect of 304 stainless steel sheet temperature and nitric acid concentration on the quality of the pickled surface.
FIG. 2 is a schematic diagram of an embodiment 1 and an embodiment 2 of a stainless steel medium plate hot rolling-on-line solid solution-on-line pickling integrated process/production line according to the invention;
FIG. 3 is a schematic diagram of an embodiment 3 of a hot rolling-on-line solid solution-on-line pickling integrated process/line for a stainless steel medium plate according to the present invention;
FIG. 4 is a flow chart of an off-line production process of the conventional stainless steel medium plate of comparative example 1;
FIG. 5 is a flow chart of the on-line solid solution production process of the stainless steel medium plate of comparative example 2 (China patent publication No. CN 111676355B).
Detailed Description
The invention will be further illustrated with reference to the following examples, which are not intended to limit the scope of the invention, but are not limited to the specific examples set forth below, and other non-essential modifications and adaptations of the invention will remain within the scope of the invention.
Referring to fig. 2, the production line of the hot rolling-on-line solid solution-on-line pickling integrated process for the medium plate stainless steel of the invention sequentially comprises: heating furnace, high-pressure water dephosphorization device, rolling mill, straightener, segmentation cutting machine, solid solution stove, cooling plant, straightener, scale cutting machine, shot-blasting machine, pickling plant, the steckel mill only starts when rolling the sheet metal below 8mm thickness.
Referring to fig. 3, in the integrated production line of the present invention, three solid solution furnaces, cooling equipment, straightening machine, fixed-length cutting machine, shot blasting machine and pickling equipment are respectively provided to form three annealing, quenching, straightening, fixed-length cutting, shot blasting and pickling production lines which are arranged in parallel; correspondingly, a steel pushing roller way is arranged at the outlet roller way of the sectional cutting machine and corresponds to the conveying roller ways of the three production lines.
Preferably, the rolling mill is a reversible rolling mill.
Preferably, the rolling mill is a reversible rolling mill, and a steckel mill, more preferably a steckel mill with a heating device, is arranged in front of and behind the rolling mill.
Preferably, the cooling device is a quenching machine.
Example 1
Referring to fig. 2, a stainless steel medium plate hot rolling-on-line solid solution-on-line pickling integrated process comprises the following steps:
1) A 304 austenitic stainless steel continuous casting blank with the size specification of 360mm multiplied by 1540 multiplied by 2000mm (thickness multiplied by width) is heated to 1300 ℃ in a heating furnace, and is discharged after heat preservation for 3.5 hours;
2) The continuous casting billet from the heating furnace is rolled after dephosphorization by high-pressure water, the initial rolling temperature is about 1250 ℃, the rolling is carried out by a reversible rolling mill in a reciprocating way for 5 times, the final rolling temperature of the steel plate is 1050 ℃, the outlet thickness is 100.0mm, and the casting billet is rolled into a steel plate with the thickness of 100mm multiplied by 1530 multiplied by 7200mm (thickness multiplied by width multiplied by length);
3) Because the length of the steel plate is shorter, the sectional cutting machine does not need to work, the rolled steel plate is pushed into a corresponding solid solution line by a steel pushing track, the residual temperature of the steel plate before being put into a furnace is 950 ℃, the steel plate is complemented to 1150 ℃ in a solid solution furnace, the temperature is kept for 1min, and then the steel plate is put into a quenching machine for rapid cooling, and the steel plate is quenched and cooled to 90 ℃;
4) After being conveyed by a conveying roller through a straightener, the quenched stainless steel plate is cut into 3 steel plates with the length of 100mm multiplied by 1530 multiplied by 2400mm by a fixed-length cutting machine, and then is mechanically dephosphorized by a shot blasting machine, and enters a pickling tank on line with the residual temperature of 80 ℃ for carrying out surface pickling passivation treatment; the acid liquor consists of nitric acid and hydrofluoric acid, wherein the concentration of the nitric acid is 100g/ml, the concentration of the hydrofluoric acid is 15/ml, and the temperature of the acid liquor is 60 ℃.
Example 2
The hot rolling-on-line solid solution-on-line pickling integrated process for the stainless steel medium plate comprises the following steps:
1) A 304 austenitic stainless steel continuous casting blank with the size specification of 240mm multiplied by 1540 multiplied by 1500mm (thickness multiplied by width multiplied by length) is heated to 1250 ℃ in a heating furnace, and is discharged after heat preservation for 3 hours;
2) The continuous casting billet from the heating furnace is rolled after dephosphorization by high-pressure water, the initial rolling temperature is about 1210 ℃, the rolling is carried out by a reversible rolling mill in a reciprocating way for 5 times, the final rolling temperature of the steel plate is 1020 ℃, the outlet thickness is 60.0mm, and the casting billet is rolled into a steel plate with the thickness of 60.0mm multiplied by 1535 multiplied by 6000mm (thickness multiplied by width multiplied by length);
3) Because the length of the steel plate is shorter, the sectional cutting machine does not need to work, the rolled steel plate is pushed into a corresponding solid solution line by a steel pushing track, the residual temperature of the steel plate before being put into a furnace is 900 ℃, the steel plate is complemented to 1100 ℃ in a solid solution furnace, the temperature is kept for 5min, then the steel plate is put into a quenching machine for rapid cooling, and the steel plate is quenched and cooled to 75 ℃;
4) After being conveyed by a conveying roller through a straightener, the quenched stainless steel plate is cut into 3 steel plates with the length of 60mm multiplied by 1535mm multiplied by 2000mm by a fixed-length cutting machine, and then is mechanically dephosphorized by a shot blasting machine, and enters a pickling tank on line with the residual temperature of 65 ℃ for surface pickling passivation treatment; the acid liquor consists of nitric acid and hydrofluoric acid, wherein the concentration of the nitric acid is 110g/ml, the concentration of the hydrofluoric acid is 16/ml, and the temperature of the acid liquor is 50 ℃.
Example 3
Referring to fig. 3, a stainless steel medium plate hot rolling-on-line solid solution-on-line pickling integrated process comprises the following steps:
1) A 304 austenitic stainless steel continuous casting blank with the size specification of 160mm multiplied by 1540 multiplied by 3000mm (thickness multiplied by width multiplied by length) is heated to 1200 ℃ in a heating furnace, and is discharged after being kept warm for 2.5 hours;
2) The continuous casting billet from the heating furnace is rolled after dephosphorization by high-pressure water, the initial rolling temperature is about 1150 ℃, a steckel mill is started at the moment, the steel plate is required to be insulated and the steel plate temperature is uniform after each pass of rolling by coiling by the steckel mill, the steel plate is rolled in a reciprocating way for 5 passes, the final rolling temperature of the steel plate is 950 ℃, the outlet thickness is 7.5mm, and the casting billet is rolled into a steel plate with the thickness of 7.5mm multiplied by 1535mm multiplied by 64000mm (the thickness multiplied by the width multiplied by the length);
3) At the moment, the length of the steel plate is longer, the rolled steel plate is cut into 6 steel plates with the length of 7.5mm multiplied by 1535mm multiplied by 10600mm by a sectional cutting machine after being straightened, three parallel solid-solution lines are respectively pushed by a steel pushing track, the residual temperature of the steel plate before being put into a furnace is 850 ℃, the steel plate is complemented to 1050 ℃ in a solid-solution furnace, the temperature is kept for 10min, and then the steel plate enters a quenching machine for rapid cooling, and the steel plate is quenched and cooled to 60 ℃;
4) After being conveyed by a conveying roller through a straightener, the quenched stainless steel plate is cut into 4 steel plates with the length of 7.5mm multiplied by 1535mm multiplied by 2650mm by a fixed-length cutting machine, then is mechanically dephosphorized by a shot blasting machine, and enters a pickling tank on line with the residual temperature of 50 ℃ for carrying out surface pickling passivation treatment; the acid liquor consists of nitric acid and hydrofluoric acid, wherein the concentration of the nitric acid is 120g/ml, the concentration of the hydrofluoric acid is 17/ml, and the temperature of the acid liquor is 45 ℃.
Comparative example 1
Referring to fig. 4, an off-line solution treatment process for austenitic stainless steel plate comprises the following steps:
(1) A 304 austenitic stainless steel continuous casting blank with the size specification of 180mm multiplied by 1540mm multiplied by 2000mm (thickness multiplied by width multiplied by length) is heated to 1230 ℃ in a heating furnace, and is discharged after heat preservation for 3 hours;
(2) The continuous casting billet from the heating furnace is rolled after dephosphorization by high-pressure water, the initial rolling temperature is about 1200 ℃, the rolling mill is rolled back and forth for 5 times, the thickness of an outlet is 20.0mm, the size of a steel plate is 20.0mm multiplied by 1535mm multiplied by 18000 (thickness multiplied by width multiplied by length), and the final rolling temperature is 1000 ℃;
(3) Cooling the rolled steel plate by laminar flow, cooling to 500 ℃, straightening, cutting to length to obtain 5 steel plates with the thickness of 20.0mm multiplied by 1535mm multiplied by 3600mm (thickness multiplied by width multiplied by length), lifting to a cooling bed, stacking, and cooling to room temperature;
(4) Lifting and loading the cooled steel plate into a solution furnace, heating the steel plate from room temperature to 1100 ℃ of solution temperature, and preserving the temperature for 30min;
(5) After the steel plate subjected to solid solution is taken out of the furnace, carrying out water cooling quenching by a quenching machine, lifting to a cooling bed, cooling to room temperature, and waiting for pickling;
(6) After straightening and eliminating plate-shaped defects, the cooled stainless steel plate enters a shot blasting machine for shot blasting treatment, and then enters a pickling tank for surface pickling passivation treatment; the acid liquor consists of nitric acid and hydrofluoric acid, wherein the concentration of the nitric acid is 200g/ml, the concentration of the hydrofluoric acid is 20g/ml, and the temperature of the acid liquor is 45 ℃.
Comparative example 2
Referring to fig. 5, an on-line solution treatment process for austenitic stainless steel sheet disclosed in chinese patent publication No. CN111676355a comprises the following steps:
(1) A 304 austenitic stainless steel continuous casting blank with the size specification of 180mm multiplied by 1536mm (thickness multiplied by width) is heated to 1250 ℃ in a heating furnace, kept for 2.5 hours and then discharged from the furnace;
(2) The continuous casting billet from the heating furnace is rolled after dephosphorization by high-pressure water, the initial rolling temperature is about 1220 ℃, the roughing mill is used for rolling for 5 times in a reciprocating way, and the thickness of the intermediate billet at the rough rolling outlet is 26.0mm; rolling by a finishing mill for 1 pass, rolling the intermediate billet to the thickness of a finished product, wherein the size of the finished product is 20.0mm multiplied by 1535mm (thickness multiplied by width), and the final rolling temperature is 1030 ℃;
(3) Slowly swinging the rolled steel plate for 150s on a roller way in front of and behind a finishing mill to fully soften the steel plate subjected to work hardening after rolling deformation;
(4) The softened stainless steel plate enters a cooling area for ultra-rapid cooling, the cooling temperature is about 860 ℃ and the final cooling temperature is about 400 ℃;
(5) Straightening and cutting the cooled steel plate into steel plates (thickness is multiplied by width is multiplied by length) of 20.0mm multiplied by 1535mm multiplied by 2800mm, cooling the steel plates to room temperature by a cooling bed, lifting the steel plates to a shot blasting machine for shot blasting, and then enabling the steel plates to enter a pickling tank for pickling to remove surface impurities.
(6) And performing performance test on the steel plate subjected to the online solution treatment, and performing comparison analysis on the steel plate subjected to the offline solution treatment.
The grain sizes of the microstructure of the on-line solid solution steel plate and the off-line solid solution steel plate are respectively 9.5 grade and 9.0 grade, and the hardness is 191HB and 190HB respectively. The corrosion resistance of the steel plate is detected according to a corrosion stainless steel intergranular corrosion test method (GB/T4334-2008) of metals and alloys, and a sample after corrosion and bending is observed under a 10-time magnification microscope, and the surface of the sample is perfect and has no cracks. The performance test result shows that the online solid solution process can obtain the product performance similar to that of the offline solid solution process under the conditions of saving the production cost and shortening the production period.
Compared with comparative example 1 (see table 1 for specific process), in the embodiment 3 of the invention, in order to roll the sheet, a steckel mill is started, laminar cooling is not used, rolling waste heat is fully utilized, the temperature before entering a solution furnace is still up to 950 ℃, the energy consumption of the solution furnace is saved by nearly 30%, the annealing time is saved by 70%, and the production period is greatly shortened.
In addition, the temperature of the quenched (cooled) steel plate is controlled at 90 ℃, the residual temperature of the steel plate still remains 80 ℃ after straightening, fixed-length cutting and shot blasting, and the on-line hot pickling of the steel plate is realized, so that the acid consumption is saved by about 33%.
Compared with comparative example 2, the method of example 3 of the invention does not need to swing the steel for 2.5min after finishing rolling, does not affect the productivity of the rolling mill, and does not need to be cooled after rolling.
Similarly, the conditions of the comparative example 2 and the comparative example 1 are similar, the temperature of the steel plate is still about 400 ℃ after being subjected to ultra-fast cooling and straightening by high-pressure jet flow, the steel plate is lifted to a cooling bed to be cooled to room temperature, and then shot blasting and off-line pickling treatment are carried out. The steel plate residual temperature after the rapid cooling of the quenching machine is only 90 ℃, the steel plate residual temperature after the straightening and the fixed-length cutting is still 80 ℃, and the shot blasting and the acid washing treatment are directly carried out on line, so that the steel plate is subjected to the acid washing with the temperature, and the acid consumption is saved by about 33%.
The steel sheets of the invention of example 1, example 2 and example 3 after pickling were subjected to performance test, and compared with the steel sheets of the invention of comparative example 1 and comparative example 2 produced off-line, the comparison of mechanical properties and corrosion properties is shown in Table 2. Wherein, the room temperature tensile property is detected according to GB/T228.1-2021 standard; the Brinell hardness is detected according to GB/T231.1-2018 standard; the grain size of the microstructure is detected according to GB/T6394-2017 standard; the content of alpha-phase is detected according to GB/T13305-2008 standard; the intergranular corrosion E method is detected according to the GB/T4334-2020 standard.
The performance test result shows that the hot rolling-on-line solid solution-on-line acid washing integrated process of the stainless steel medium plate can obtain the product surface and performance similar to those of the off-line production process under the conditions of saving energy consumption and acid consumption and shortening the production period.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art may make modifications or alterations to the above disclosed technical content to equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The hot rolling-on-line solid solution-on-line pickling integrated process for the medium plate stainless steel is characterized by comprising the following steps of:
1) Heating the stainless steel plate blank by a heating furnace at 1200-1300 ℃ for 2.5-3.5 h; then high-pressure water dephosphorization is carried out to remove iron scales on the surface of the stainless steel slab; rolling to the target thickness after multi-pass rolling, and then thermally straightening and sectionally cutting into steel plates;
2) The steel plate with the residual temperature above 850 ℃ is conveyed to a solid solution furnace on line through a conveying roller to carry out heat supplement, the steel plate carries out heat supplement to the solid solution temperature of 1050-1150 ℃, the heat preservation time is 1-10 min, and then the steel plate is cooled to the target temperature of 60-90 ℃ through water cooling or air cooling;
3) And (3) straightening, cutting to a fixed length, performing online shot blasting treatment on the cooled steel plate through a conveying roller, and then enabling the steel plate to have residual temperature of 50-80 ℃ and enter an acid washing process through the conveying roller, removing oxide skin on the surface of the steel plate, and then placing the steel plate in a line for storage.
2. The integrated hot rolling-on-line solid solution-on-line pickling process for medium plate stainless steel according to claim 1, wherein the rolling in step 1) is performed by a reversible rolling mill.
3. The integrated hot rolling-on-line solid solution-on-line pickling process for medium plate stainless steel according to claim 1 or 2, wherein the step 1) rolling adopts a reversible rolling mill, and a steckel mill is started when a steel plate with the thickness of less than 8mm is rolled.
4. The hot rolling-on-line solid solution-on-line pickling integrated process for medium plate stainless steel according to claim 1, 2 or 3, wherein in step 3), the pickling acid solution consists of nitric acid and hydrofluoric acid; wherein the concentration of nitric acid is 100-200 g/L, the concentration of hydrofluoric acid is 15-35 g/L, and the temperature of mixed acid is 45-60 ℃.
5. A production line for a hot rolling-on-line solid solution-on-line pickling integrated process for medium plate stainless steel according to any one of claims 1 to 4, comprising, in order: heating furnace, high-pressure water dephosphorization device, rolling mill, straightener, segmentation cutting machine, solid solution furnace, cooling equipment, cold straightening machine, scale cutting machine, shot-blasting machine, pickling equipment.
6. The production line of claim 5, wherein the rolling mill is a reversible rolling mill.
7. The production line according to claim 5, wherein the rolling mill is a reversible rolling mill, and a steckel mill, preferably a steckel mill belt heating device, is arranged before and after the rolling mill.
8. The production line according to claim 5, 6 or 7, wherein three solid solution furnaces, cooling equipment, shot blasting machines, straightening machines and pickling equipment are respectively arranged to form three annealing, quenching, cold straightening machines, sizing cutting machines, shot blasting and pickling production lines which are arranged in parallel; correspondingly, a steel pushing roller way is arranged at the outlet roller way of the sectional cutting machine and corresponds to the conveying roller ways of the three production lines.
9. The production line of claim 5 or 6 or 7, wherein the cooling device is a quenching machine.
10. The production line of claim 8, wherein the cooling device is a quenching machine.
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