CN114645213A - High-hardness corrosion-resistant steel plate and production method thereof - Google Patents
High-hardness corrosion-resistant steel plate and production method thereof Download PDFInfo
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C21D2211/00—Microstructure comprising significant phases
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Abstract
The invention relates to the technical field of steel production, in particular to a high-hardness corrosion-resistant steel plate and a production method thereof. The steel plate is prepared by heating, rolling, straightening, cooling and heat treating a continuous casting plate blank, wherein the chemical components of the continuous casting plate blank are as follows: 0.16% -0.20%, Si: 0.20-0.40%, Mn: 0.6-0.8%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Cr: 0.60% -0.75%, Cu: 0.40% -0.50%, Nb: 0.025 to 0.040 percent, Ti: 0.015% -0.030%, Ni: 0.15% -0.25%, Als: 0.015% -0.050%, B: 0.0010 to 0.0025 percent, the balance of Fe and other impurities, and the weather resistance index I is more than or equal to 6.0. The invention improves the capability of the material for resisting impact and abrasion, is suitable for being applied under complex abrasion working conditions, and has high abrasion resistance.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a high-hardness corrosion-resistant steel plate and a production method thereof.
Background
The weathering steel, also called as atmospheric corrosion resistant steel, can form a compact oxide film on the surface of a steel plate to enhance the passivation capability of the steel and further reduce the corrosion of a matrix when exposed to the atmospheric conditions for a long time without coating. The steel is widely applied to the fields of railway transportation, containers, oil drilling, bridges and the like because of the characteristics of 2-8 times of atmospheric corrosion resistance, higher toughness, excellent weldability and the like superior to common carbon steel, and in addition, along with the deepening of energy mineral exploitation, the steel for a wear-resistant application environment can face more complicated conditions, such as working in a humid corrosive environment and the like, and under the double actions of abrasion and corrosion, the steel plate generates cross abrasion including corrosion abrasion, so that rapid failure is caused, and therefore the invention of the high-hardness corrosion-resistant steel plate is urgently needed.
At present, the rapid development of the railway vehicle, transportation and mineral mining industries puts higher requirements on the weathering steel, and the weathering steel gradually develops towards the directions of light weight, high strength, high hardness, high corrosion resistance and the like. The Chinese patent application CN 113234988A discloses weather-resistant steel with yield strength of 700MPa produced by on-line quenching, which comprises the following chemical components: 0.03 to 0.07 percent of Si: 0.30-0.45%, Mn: 1.00-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Cu: 0.60% -1.10%, Cr: 0.45-0.55%, Ni: 1.20-1.80%, Ti: 0.08-0.12 percent of the total weight of the steel, and the balance of Fe and impurities, wherein the outlet thickness of the rolling mill is 6-12 mm. The invention contains a large amount of alloy elements such as Ni, Cu and the like, has higher cost, has smaller specification range of the thickness of the steel plate, has certain limitation, and has low strength and is not suitable for a wear environment.
Chinese patent application CN 111690879 a discloses a 600MPa grade high corrosion resistant weathering steel, whose chemical components are C less than or equal to 0.12%, Si: 1.20-2.00%, Mn is less than or equal to 1.50%, P: 0.060% -0.150%, S is less than or equal to 0.015%, Cr: 2.90% -3.70%, Ni: 0.10-0.40%, Cu: 0.20-0.60 percent of Al, more than or equal to 0.010 percent of Als, and the balance of Fe and inevitable impurities, wherein the atmospheric corrosion resistance index I reaches 12.61-14.02. The steel plate has a high P, Si content, and P can reduce the low-temperature impact toughness of the steel plate and improve the cold-brittleness risk while improving the corrosion resistance; the high Si content increases the smelting difficulty and simultaneously has certain influence on the toughness of the steel plate; a large amount of Cr alloy is added, so that the risk of cracks is increased, and the cost is increased; and the steel plate has low strength and is not suitable for abrasion environment.
Disclosure of Invention
Aiming at the technical problems that the existing weathering steel is not suitable for a wear environment and the alloy cost is high, the invention provides a high-hardness corrosion-resistant steel plate and a production method thereof, the hardness of the high-hardness corrosion-resistant steel plate is 380-430 HBW, the yield strength is more than or equal to 980MPa, the tensile strength is more than or equal to 1200MPa, the elongation after fracture is more than or equal to 13 percent, the low-temperature impact energy at minus 20 ℃ is more than or equal to 34J, and the atmospheric corrosion resistance index I is more than or equal to 6.0.
In a first aspect, the invention provides a method for producing a high-hardness corrosion-resistant steel plate, which is used for preparing the high-hardness corrosion-resistant steel plate by heating, rolling, straightening, cooling and heat treatment of a continuous casting slab, wherein the continuous casting slab comprises the following chemical components in percentage by mass: 0.16% -0.20%, Si: 0.20-0.40%, Mn: 0.6-0.8%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Cr: 0.60% -0.75%, Cu: 0.40% -0.50%, Nb: 0.025 to 0.040 percent, Ti: 0.015% -0.030%, Ni: 0.15% -0.25%, Als: 0.015% -0.050%, B: 0.0010 to 0.0025 percent, the balance being Fe and other impurities, the weather resistance index I is more than or equal to 6.0, and the formula is that I is 26.01Cu +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) (% Ni) -9.10 (% Ni) (% P) -33.39 (% Cu)2。
Furthermore, the continuous casting plate blank is prepared by molten iron after pretreatment, converter smelting, external refining and continuous casting, wherein the sulfur content in the molten iron is reduced to 0.003 percent after the molten iron is subjected to KR desulfurization pretreatment;
bottom blowing argon gas and sliding plate slag blocking are carried out in the whole converter smelting process, the oxygen content at the end point is strictly controlled to be less than or equal to 450ppm, converter slag tapping is strictly prohibited, and the purity of molten steel is improved;
refining by adopting an LF + RH duplex process, adding lime and fluorite to make white slag to remove oxide inclusions, wherein the pure degassing time below vacuum 133pa is more than or equal to 10 min;
the continuous casting adopts high-alkalinity casting powder for protective pouring, the molten steel is strictly forbidden to be exposed, the superheat degree is controlled at 15-25 ℃, a high-alloy steel secondary cooling water mode and dynamic soft reduction are selected, the quality of a casting blank is superior to that of a center segregation C type 1.5, no center porosity and cracks exist, the gas content H in steel is less than or equal to 2ppm, O is less than or equal to 25ppm, N is less than or equal to 40ppm, and the weather-resistant index I is strictly ensured to be more than or equal to 6.0.
Further, a stepping heating furnace is adopted to heat the continuous casting plate blank, and due to the addition of alloy elements such as Cu, Cr and Nb, in order to ensure that the alloy elements are fully dissolved and prevent the edges of the steel plate from cracking in the rolling process caused by the enrichment of Cu in the heating process, the tapping temperature of the heating furnace is controlled to be 1200-1280 ℃.
Further, two-stage rolling is adopted, a large rolling force and single-pass large reduction rolling process is adopted in the rough rolling stage, and the thickness of the intermediate blank is more than 3 times that of the finished product; the finished product of the steel plate with the thickness less than or equal to 20mm is finished, and the finish rolling temperature in the finish rolling stage is 900-920 ℃; and (3) quickly adding water after the steel plate is rolled, wherein the start cooling temperature is more than or equal to 860 ℃, the cooling speed is 3-7 ℃ for 3s, and the final cooling temperature is more than 700 ℃.
Further, two-stage rolling is adopted, a large rolling force and single-pass large reduction rolling process is adopted in the rough rolling stage, and the thickness of the intermediate blank is more than 3 times that of the finished product; the finished product is a (20, 40) mm steel plate, the finish rolling temperature in the finish rolling stage is 880-900 ℃, water is quickly fed into the steel plate after the steel plate is rolled, the start cooling temperature is not less than 860 ℃, the cooling speed is 3-7 ℃ for 3s, and the finish cooling temperature is more than 700 ℃.
Further, a hot straightening machine is adopted to correct the shape of the steel plate, the straightening pass is more than or equal to 3, the final straightening temperature is less than or equal to 500 ℃, and internal stress and residual stress are eliminated.
Further, the cooling procedure is that the steel plate is stacked and slowly cooled after being off-line.
Further, the steel plate with the thickness less than or equal to 20mm is subjected to heat treatment by an off-line quenching process, the quenching heating temperature is 860-900 ℃, the heat preservation time is 20-60 min, and then water quenching is carried out to the room temperature.
Further, the heat treatment of the finished steel plate with the thickness of (20, 40) mm adopts an off-line quenching and tempering process, the quenching heating temperature is 860-900 ℃, the heat preservation time is 20-60 min, the tempering temperature is 340-380 ℃, and the heat preservation time is 20-120 min.
In a second aspect, the present invention provides a high-hardness corrosion-resistant steel sheet produced by the above production method.
Further, the thickness of the high-hardness corrosion-resistant steel plate is not more than 40 mm.
Further, the microstructure of the high-hardness corrosion-resistant steel plate is a martensite or tempered martensite structure.
The added alloy elements such as Cu, Cr and the like of the high-hardness corrosion-resistant steel plate can promote the formation of an oxide film on the surface of steel, improve the atmospheric corrosion resistance of the steel plate, and simultaneously, the added Ni element effectively prevents copper brittleness, reduces crack sensitivity in the welding process and promotes grain refinement of an inner rust layer to enable the inner rust layer to be more compact; alloy elements such as Nb and Ti are added to refine grains, and the strong plasticity of the steel plate is improved through modes such as fine grain strengthening and precipitation strengthening; the addition of B element improves the hardenability of the steel sheet and further improves the hardness and strength of the steel sheet.
Specifically, the steel plate has the following functions of components:
c: 0.16-0.20 percent, and the solid solution strengthening mode improves the hardness and the strength of the steel, so that the steel plate obtains higher hardness after quenching treatment and has certain plasticity and toughness, thereby being an effective strengthening element in the steel.
And Als: 0.015% -0.050%, effective deoxidizing elements in steel have obvious effects on grain refinement and low-temperature impact toughness improvement, but the hot workability and the welding performance can be reduced when the content is too high, so that the content of Als is controlled to be 0.015% -0.050%.
Nb: 0.025 to 0.040 percent, the effects of grain refinement and solid solution strengthening, the refinement of the austenite grain size at the austenite recrystallization temperature, the carbon and nitrogen fixation in steel due to the strong affinity with carbon and nitrogen, and the plastic toughness and the welding performance of the steel plate are effectively improved.
Ti: 0.015% -0.030%: the Nb has the same carbon and nitrogen fixing effects as Nb, inhibits austenite grains from growing large, precipitates fine second phase grains in the cooling process, plays the roles of fine grain strengthening and solid solution strengthening, and can increase the tempering stability and reduce the overheating tendency.
Cu: 0.40-0.50%, most common alloy elements for improving the corrosion resistance of the steel plate can promote the anode passivation to form a rust layer with good compactness, reduce the corrosion of a matrix and improve the corrosion resistance, and can improve the strength of the steel plate through solid solution reinforcement; when the Cu content is too high, the effect is reduced and the risk of crack generation during processing is increased, so that the Cu content is controlled to be 0.40-0.50%.
Cr: 0.60% -0.75%, Cr element can improve the hardenability of the steel plate, and simultaneously improve the hardness, wear resistance and corrosion resistance of the steel plate, and Cu, Cr and Ni are added simultaneously, so that the formation of a stable rust layer containing alpha-FeOOH can be effectively promoted, and the corrosion resistance of the steel plate is improved by taking a synergistic effect.
Ni: 0.15-0.25% of Ni and NiFe2O4The corrosion inhibitor exists in spinel type oxide, can promote spinel to be finer and more compact, can improve the compactness of an inner rust layer, is a very effective corrosion-resistant element, and can reduce copper brittleness and generation of cracks in the welding process.
B: 0.0010-0.0025%, the addition of B element can improve the hardenability of the steel plate and the hardness and strength of the steel plate, but excessive boron can also coarsen crystal grains and reduce the low-temperature impact toughness of the steel plate.
The invention has the beneficial effects that:
the high-hardness corrosion-resistant steel plate provided by the invention has the thickness specification of less than or equal to 40mm, has high hardness (380-430 HBW), good atmospheric corrosion resistance (the atmospheric corrosion resistance index I is more than or equal to 6.0), and has the functions of resisting abrasion and corrosion, and can be applied to a wet atmospheric corrosion environment; meanwhile, the high-hardness corrosion-resistant steel plate also has good plasticity and toughness, the elongation after fracture is more than or equal to 13%, the low-temperature impact toughness (more than or equal to 34J) at minus 20 ℃ is better, the impact wear resistance of the material is improved, and the high-hardness corrosion-resistant steel plate is suitable for being applied under complex wear working conditions and has high wear resistance.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a metallographic structure photograph of a high-hardness corrosion-resistant steel sheet according to example 1 of the present invention.
FIG. 2 is a metallographic structure photograph of a high-hardness corrosion-resistant steel sheet according to example 2 of the present invention.
FIG. 3 is a metallographic structure photograph of a high-hardness corrosion-resistant steel sheet according to example 3 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high-hardness corrosion-resistant structural steel plate with the thickness of 40mm comprises the following chemical components in percentage by mass: 0.17%, Si: 0.25%, Mn: 0.64%, P: 0.012%, S: 0.002%, Cr: 0.68%, Cu: 0.43%, Nb: 0.031%, Ti: 0.018%, Ni: 0.17%, Als: 0.022%, B: 0.0017 percent, the balance of Fe and other inevitable impurities, and the weather resistance index I is 6.55.
The preparation method of the structural steel plate for high hardness and corrosion resistance comprises the following steps:
1) pretreatment and smelting: after the molten iron is subjected to KR desulfurization pretreatment, the sulfur content in the molten iron is reduced to 0.003 percent, argon is blown at the bottom of the converter in the whole process, the slag is blocked by a sliding plate, the end point oxygen content is strictly controlled to be less than or equal to 450ppm, and the converter slag is strictly controlled, so that the purity of the molten steel is improved.
2) Refining: adopting LF + RH duplex process, adding lime and fluorite to make white slag to remove oxide inclusions, and pure degassing under vacuum of less than 133Pa for 15 min.
3) Continuous casting: the casting is protected by high-alkalinity casting powder, the molten steel is strictly forbidden to be exposed, the superheat degree is 17 ℃, a high-alloy steel secondary cooling water mode and dynamic soft reduction are selected, the quality of a casting blank is class C1.0, and the gas content H in the steel is 1.75ppm, the O content is 22ppm and the N content is 36 ppm.
4) And (3) heating the plate blank by adopting a stepping heating furnace, wherein the discharging temperature of the heating furnace is controlled at 1235 ℃.
5) Rolling: two-stage rolling is adopted, a large rolling force and single-pass large reduction rolling process is adopted in the rough rolling stage, and the thickness of the intermediate blank is 4 times that of the finished steel plate; the finish rolling temperature is 892 ℃, the steel plate is rapidly cooled after rolling, the start cooling temperature is 871 ℃, the cooling speed is 4 ℃ for 3s, and the final cooling temperature is 730 ℃.
6) After 4 times of straightening, the head part of the final straightening temperature is 480-495 ℃, the middle part is 470-485 ℃, and the tail part is 470-480 ℃, so that internal stress and residual stress are eliminated.
7) And (3) cooling: and stacking and slowly cooling the steel plates after the steel plates are off line.
8) And (3) heat treatment: off-line quenching and tempering, wherein the quenching heating temperature is 875 ℃, the heat preservation time is 60min, the tempering temperature is 360 ℃, and the heat preservation time is 117 min.
The comprehensive properties of the finally obtained steel sheet are shown in table 1; the metallographic structure is a tempered martensite structure as shown in FIG. 1.
Example 2
A high-hardness corrosion-resistant structural steel plate with the thickness of 20mm comprises the following chemical components in percentage by mass: 0.17%, Si: 0.27%, Mn: 0.63%, P: 0.012%, S: 0.002%, Cr: 0.65%, Cu: 0.46%, Nb: 0.028%, Ti: 0.017%, Ni: 0.18%, Als: 0.025%, B: 0.0015 percent, the balance of Fe and other inevitable impurities, and the weather resistance index I is 6.40.
The preparation method of the high-hardness corrosion-resistant structural steel plate comprises the following steps:
1) pretreatment and smelting: after the molten iron is subjected to KR desulfurization pretreatment, the sulfur content in the molten iron is reduced to 0.002%, argon is blown at the bottom of the converter in the whole process, the slag is blocked by a sliding plate, the end point oxygen content is strictly controlled to be less than or equal to 450ppm, and the converter slag is strictly controlled, so that the purity of the molten steel is improved.
2) Refining: adopting LF + RH duplex process, adding lime and fluorite to make white slag to remove oxide inclusions, and pure degassing under vacuum below 133Pa for 14 min.
3) Continuous casting: the casting is carried out by adopting high-alkalinity casting powder for protecting casting, the molten steel is strictly forbidden to be exposed, the superheat degree is 20 ℃, a high-alloy steel secondary cooling water mode and dynamic soft reduction are selected, the casting blank quality is class C1.0, and the gas content H, O and N in the steel are respectively 1.66ppm, 23ppm and 32 ppm.
4) And (3) heating the plate blank by adopting a stepping heating furnace, wherein the tapping temperature of the heating furnace is controlled at 1222 ℃.
5) Rolling: two-stage rolling is adopted, a large rolling force and single-pass large reduction rolling process is adopted in the rough rolling stage, and the thickness of the intermediate blank is 3.5 times that of a finished steel plate; the finish rolling temperature is 915 ℃, the steel plate is rapidly cooled after being rolled, the start cooling temperature is 870 ℃, the cooling speed is 6 ℃ for 3s, and the final cooling temperature is 724 ℃.
6) After 4-pass straightening, the final straightening temperature is 490-500 ℃ at the head, 485-497 ℃ at the middle and 472-481 ℃ at the tail, and internal stress and residual stress are eliminated.
7) And (3) cooling: and stacking and slowly cooling the steel plates after the steel plates are off line.
8) And (3) heat treatment: off-line quenching, wherein the quenching heating temperature is 880 ℃, the heat preservation time is 34min, and then water quenching is carried out to the room temperature.
The comprehensive properties of the finally obtained steel sheet are shown in table 1; the metallographic structure is a martensite structure as shown in FIG. 2.
Example 3
A high-hardness corrosion-resistant structural steel plate with the thickness of 10mm comprises the following chemical components in percentage by mass: 0.17%, Si: 0.29%, Mn: 0.66%, P: 0.012%, S: 0.002%, Cr: 0.69%, Cu: 0.48%, Nb: 0.031%, Ti: 0.019%, Ni: 0.20%, Als: 0.025%, B: 0.0016%, the balance of Fe and other unavoidable impurities, and the weather resistance index I is 6.35.
The preparation method of the structural steel plate for high hardness and corrosion resistance comprises the following steps:
1) pretreatment and smelting: after the molten iron is subjected to KR desulfurization pretreatment, the sulfur content in the molten iron is reduced to 0.003 percent, argon is blown at the bottom of the converter in the whole process, the slag is blocked by a sliding plate, the end point oxygen content is strictly controlled to be less than or equal to 450ppm, and the converter slag is strictly controlled, so that the purity of the molten steel is improved.
2) Refining: adopting LF + RH duplex process, adding lime and fluorite to make white slag to remove oxide inclusions, and pure degassing under vacuum of less than 133Pa for 16 min.
3) Continuous casting: high-alkalinity casting powder is adopted for casting protection, molten steel is strictly forbidden to be exposed, the superheat degree is 18 ℃, a high-alloy steel secondary cooling water mode and dynamic soft reduction are selected, the quality of a casting blank is class C1.0, and the gas content H in steel is 1.83ppm, the gas content O in the steel is 21ppm, and the gas content N in the steel is 38 ppm.
4) And (3) heating the plate blank by adopting a stepping heating furnace, wherein the tapping temperature of the heating furnace is controlled at 1240 ℃.
5) Rolling: two-stage rolling is adopted, a large rolling force and single-pass large reduction rolling process is adopted in the rough rolling stage, and the thickness of the intermediate blank is 3.0 times that of the finished steel plate; the finish rolling temperature is 916 ℃, the steel plate is rapidly cooled by water after being rolled, the start cooling temperature is 873 ℃, the cooling speed is 6 ℃ for 3s, and the final cooling temperature is 720 ℃.
6) After 4 times of straightening, the final straightening temperature is 482-490 ℃ at the head, 475-485 ℃ at the middle and 468-477 ℃ at the tail, and internal stress and residual stress are eliminated.
7) And (3) cooling: and stacking and slowly cooling the steel plates after the steel plates are off line.
8) And (3) heat treatment: off-line quenching, wherein the quenching heating temperature is 880 ℃, the heat preservation time is 22min, and then water quenching is carried out to the room temperature.
The comprehensive properties of the finally obtained steel sheet are shown in table 1; the metallographic structure is a martensite structure as shown in FIG. 3.
TABLE 1 mechanical Properties of high-hardness corrosion-resistant structural steel sheets for respective examples
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and the spirit of the present invention, and all such modifications or substitutions are within the scope of the present invention 3 any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention as disclosed in the present invention, and all such changes or substitutions are within the scope of the present invention.
Claims (10)
1. The production method of the high-hardness corrosion-resistant steel plate is characterized in that a continuous casting plate blank is used for preparing the high-hardness corrosion-resistant steel plate through heating, rolling, straightening, cooling and heat treatment, wherein the continuous casting plate blank comprises the following chemical components in percentage by mass: 0.16% -0.20%, Si: 0.20-0.40%, Mn: 0.6-0.8%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Cr: 0.60% -0.75%, Cu: 0.40% -0.50%, Nb: 0.025 to 0.040 percent, Ti: 0.015% -0.030%, Ni: 0.15% -0.25%, Als: 0.015% -0.050%, B: 0.0010 to 0.0025 percent, the balance of Fe and other impurities, and the weather resistance index I is more than or equal to 6.0.
2. The production method according to claim 1, wherein the continuous cast slab is subjected to heating treatment using a walking beam furnace, and the tapping temperature of the furnace is controlled to 1200 to 1280 ℃.
3. The production method according to claim 1, wherein two-stage rolling is adopted, and the thickness of the intermediate billet in the rough rolling stage is more than 3 times that of the finished product; the finished product of the steel plate with the thickness less than or equal to 20mm is finished, and the finish rolling temperature in the finish rolling stage is 900-920 ℃; and (3) quickly adding water after the steel plate is rolled, wherein the start cooling temperature is more than or equal to 860 ℃, the cooling speed is 3-7 ℃ for 3s, and the final cooling temperature is more than 700 ℃.
4. The production method according to claim 1, wherein two-stage rolling is adopted, and the thickness of the intermediate billet in the rough rolling stage is more than 3 times that of the finished product; the finished product is a (20, 40) mm steel plate, the finish rolling temperature in the finish rolling stage is 880-900 ℃, water is quickly fed into the steel plate after the steel plate is rolled, the start cooling temperature is not less than 860 ℃, the cooling speed is 3-7 ℃ for 3s, and the finish cooling temperature is more than 700 ℃.
5. The production method according to claim 1, wherein the shape of the steel plate is corrected by a hot straightening machine, the straightening pass is not less than 3, and the final straightening temperature is not more than 500 ℃.
6. The method of claim 1, wherein the cooling step is a step of stacking and slow cooling the steel sheet after the steel sheet is taken off-line.
7. The production method of claim 1, wherein the heat treatment of the finished steel plate with the thickness of less than or equal to 20mm adopts an off-line quenching process, the quenching heating temperature is 860-900 ℃, the heat preservation time is 20-60 min, and then the steel plate is water-quenched to room temperature.
8. The production method of claim 1, wherein the heat treatment of the finished steel plate with the thickness of (20, 40) mm adopts an off-line quenching and tempering process, the quenching heating temperature is 860-900 ℃, the heat preservation time is 20-60 min, the tempering temperature is 340-380 ℃, and the heat preservation time is 20-120 min.
9. A high-hardness corrosion-resistant steel sheet produced by the production method according to any one of claims 1 to 8.
10. The high-hardness corrosion-resistant steel plate according to claim 9, wherein the thickness of the high-hardness corrosion-resistant steel plate is not more than 40 mm.
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