Corrosion-resistant wear-resistant steel and manufacturing method thereof

Abstract

The invention discloses corrosion-resistant wear-resistant steel and a manufacturing method thereof, and belongs to the technical field of wear-resistant steel and preparation thereof, the wear-resistant steel comprises the following chemical components in percentage by weight: less than or equal to 0.22% of C, less than or equal to 0.50% of Si, less than or equal to 0.50% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, less than or equal to 0.25% of Ni, less than or equal to 5.00% of Cr, less than or equal to 0.10% of Mo, less than or equal to 0.1% of rare earth + Nb and the balance of Fe, and the sum of the components is 100%. According to the wear-resistant steel produced by adopting a new process of specific alloy design of Cr + rare earth La and Ce + low-defect continuous casting + high-permeability rolling + multi-beam array jet flow constrained roller quenching, the alloy content is less than or equal to 6 wt%, the thickness is 8-40 mm, the surface hardness is 430-470 HBW, the corrosion and wear resistance is improved by more than two times compared with that of conventional NM450 under the acidic condition that the Ph value is 4-7, and the corrosion and wear resistance of the wear-resistant steel is greatly improved. And meanwhile, good machinability and welding performance are achieved.

Description

Technical Field

[0001] The invention relates to a wear-resistant steel and a manufacturing method thereof, in particular to a corrosion-resistant and wear-resistant steel and a manufacturing method thereof, belonging to the technical field of wear-resistant steel and its preparation. Background Art

[0002] In the fields of land reclamation, channel dredging, slurry and garbage transportation, power plants, etc., a large amount of solid particles will cause a certain degree of wear on the material surface during the transportation process. However, due to the presence of certain corrosive media, the failure mode of the material is not simple wear, but the combined effect of corrosion and wear. Corrosive wear refers to the loss of metal materials caused by friction and wear in a corrosive environment. The material loss is the result of the combined influence of mechanical, chemical and electrochemical factors and their interactions. Compared with corrosion and wear damage, the movement of the contact surfaces during the corrosion and wear process not only directly wears the material, but also destroys the protective film on the surface of the material, causing the fresh material surface to continuously contact the corrosive fluid and accelerate the corrosion, forming an interaction between corrosion and wear. Therefore, the corrosion and wear coupling damage is not just a simple superposition of material corrosion and wear damage, but a significant increase in material loss caused by corrosion, wear and their interaction.

[0003] According to statistics, corrosive wear (including erosive wear) accounts for about 13% of all wear losses. Since abrasion is different from simple mechanical wear and corrosion, the composition, organizational design and development path of corrosion-resistant alloys and wear-resistant alloys are different. The former mostly adds alloying elements to enhance its spontaneous passivation ability, such as stainless steel; while the latter often uses high-strength matrix and high-hardness second phase reinforcement to improve the alloy's load-bearing and plowing resistance, such as martensitic wear-resistant steel and alloy cast iron. The development of wear-resistant alloys is currently mainly focused on the impact of medium corrosion on micro-cutting or plowing. The developed steels are mainly used for parts of turbines and mining ball mills. Wear-resistant steels specifically used for conveying slurries or solid particles containing corrosive media are still rare. Ordinary low-alloy wear-resistant steels have excellent wear properties, and are also characterized by low cost and good processing performance. They are widely used in some engineering machinery and equipment with severe wear.

[0004] With the continuous development of economy and society, people are gradually aware of the damage caused by corrosion and wear. Major foreign steel companies have also begun to develop corrosion-resistant steels for different environments, including NK-SL80 developed by Japan's JFE Corporation, and SSAB produced by Sweden. HiAce steel, but in China, corrosion-resistant and wear-resistant steels for corrosive working conditions are still rare.

[0005] Patent CN112159934A discloses a corrosion-resistant and wear-resistant steel plate and its preparation method. The invention reduces the carbon content by alloy composition design and combines heat treatment process to obtain a new type of steel plate with excellent corrosion resistance and wear resistance in an acidic environment: in acidic working conditions with a pH value of 4-5, its corrosion resistance and wear resistance are 2.5-3.0 times that of existing Brinell hardness martensitic wear-resistant steel. However, the presence of steel inclusions during smelting will affect the corrosion resistance and wear resistance of the steel plate. This method does not treat the inclusions.

[0006] Patent CN114774772B discloses a corrosion 500HB martensitic wear-resistant steel plate and its production method, but its carbon content is high, reaching 0.25-0.30%, which makes welding difficult and increases subsequent manufacturing costs. The addition of Ti in the alloy makes smelting and continuous casting extremely difficult, and the oxidation of the Ti element must be controlled during smelting. At the same time, the influence of inclusions in the steel grade is not resolved.

[0007] Therefore, developing a corrosion-resistant, wear-resistant steel and a method for manufacturing the same that can overcome the above-mentioned defects has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the sharp deterioration of the wear performance of conventional wear-resistant steel under humid and corrosive conditions, reduce the production cost of corrosion-resistant steel, break the assembly restrictions, and overcome the shortcomings of the prior art. A corrosion-resistant wear-resistant steel and a manufacturing method thereof are provided. The wear-resistant steel produced by the present invention has an alloy content of ≤6wt%, a thickness of 8-40mm, a surface hardness of 430-470HBW, and an anti-corrosion and wear performance under acidic conditions with a Ph value of 4-7 that is more than twice that of conventional NM450, and at the same time has good processability and welding performance.

[0009] In order to solve the above technical problems, the present invention provides a corrosion-resistant, wear-resistant steel, the chemical composition of which is calculated by weight percentage as follows: C≤0.22%, Si≤0.50%, Mn≤0.50%, P≤0.025%, S≤0.010%, Ni≤0.25%, Cr≤5.00%, Mo≤0.10%, rare earth+Nb≤0.1%, and the balance is Fe, and the sum of the above components is 100%.

[0010] The technical solution further defined in the present invention is:

[0011] Furthermore, in the aforementioned corrosion-resistant, wear-resistant steel, the chemical composition of the wear-resistant steel is calculated by weight percentage as follows: C: 0.18%, Si: 0.23%, Mn: 0.25%, P: 0.010%, S: 0.001%, Ni: 0.06%, Cr: 3.95%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the remainder is Fe, and the sum of the above components is 100%.

[0012] In the aforementioned corrosion-resistant, wear-resistant steel, the chemical composition of the wear-resistant steel is calculated by weight percentage as follows: C: 0.19%, Si: 0.27%, Mn: 0.24%, P: 0.004%, S: 0.003%, Ni: 0.07%, Cr: 4.01%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the remainder is Fe. The sum of the above components is 100%.

[0013] In the aforementioned corrosion-resistant, wear-resistant steel, the chemical composition of the wear-resistant steel is calculated by weight percentage as follows: C: 0.18%, Si: 0.26%, Mn: 0.26%, P: 0.008%, S: 0.002%, Ni: 0.03%, Cr: 3.98%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the remainder is Fe. The sum of the above components is 100%.

[0014] In the aforementioned corrosion-resistant, wear-resistant steel, the chemical composition of the wear-resistant steel is calculated by weight percentage as follows: C: 0.21%, Si: 0.26%, Mn: 0.24%, P: 0.009%, S: 0.002%, Ni: 0.08%, Cr: 3.90%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the remainder is Fe. The sum of the above components is 100%.

[0015] In the aforementioned corrosion-resistant, wear-resistant steel, the chemical composition of the wear-resistant steel is calculated by weight percentage as follows: C: 0.20%, Si: 0.25%, Mn: 0.23%, P: 0.005%, S: 0.001%, Ni: 0.09%, Cr: 3.94%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the remainder is Fe. The sum of the above components is 100%.

[0016] In the aforementioned corrosion-resistant, wear-resistant steel, the rare earth is a mixture of lanthanum and cerium.

[0017] In the aforementioned corrosion-resistant and wear-resistant steel, the microstructure of the wear-resistant steel is lath martensite.

[0018] The present invention also provides a method for manufacturing corrosion-resistant and wear-resistant steel, which is as follows:

[0019] Electric furnace smelting: add ferromolybdenum, nickel plate, ferroniobium, low carbon chromium, ferromanganese, ferrosilicon and rare earth ferrosilicon in sequence, and the smelting temperature is 1600-1620℃ to obtain molten steel;

[0020] Pouring: pouring molten steel, the thickness of the casting is 220-320mm;

[0021] Slab heating: Heat the slab to 1180-1250℃, soaking time 30-50 minutes;

[0022] Rolling: then rolling in the recrystallization zone and rolling in the non-recrystallization zone, wherein the final rolling temperature of the recrystallization zone rolling is 1000-1100°C, and the final rolling temperature of the non-recrystallization zone rolling is 790-950°C;

[0023] Heat treatment process: quenching temperature is AC3+(20-50)℃, critical temperature is AC3 (hypoeutectoid steel), then tempering at 180℃, tempering time is 45-55min.

[0024] Technical effect: The quenching process of the present invention adopts a multi-beam array jet constrained roller quenching process, and adopts the first domestic roller-pressed constrained online quenching system. The equipment is arranged between the outlet of the pre-straightening machine and the inlet of the original cooling equipment. The cooling manifold is inserted between the upper constrained rollers. Each group of constrained rollers can be raised and lowered individually. The lifting mechanism is controlled and precisely positioned by a servo hydraulic cylinder to achieve cooling while constraining the deformation of the steel plate during the cooling process. While the steel plate obtains high cooling intensity, high plate shape quality control is guaranteed.

[0025] The technical solution further defined in the present invention is:

[0026] In the aforementioned method for manufacturing corrosion-resistant and wear-resistant steel, the quenching time in the heat treatment process is controlled as follows:

[0027] When the steel plate thickness is ≤20mm, the heating time is plate thickness + 30min; when the steel plate thickness is >20mm, the heating time is 2.5 times the plate thickness.

[0028] The beneficial effects of the present invention are:

[0029] The invention takes into account the weldability of the material while considering obtaining the required strength and hardness performance, controls the content of the C element to be ≤0.22%, adds Cr and Mo to improve the hardenability of the wear-resistant steel plate, ensures the uniformity of the thickness section structure and hardness performance, and adds high Cr and appropriate amounts of rare earth lanthanum (La) and cerium (Ce) elements on the basis of traditional wear-resistant steel. By controlling rolling and offline heat treatment, the Cr element can play a role in quickly forming a passivation film and improving the corrosion resistance. The addition of lanthanum (La) and cerium (Ce) rare earth alloys plays a role in purifying molten steel, modifying inclusions and micro-alloying, so that the inclusions are modified to reduce the corrosion sensitivity of the interface between the inclusions and the matrix. Based on this, the new corrosion-resistant and wear-resistant steel plate obtains good corrosion and wear resistance.

[0030] The key technologies for manufacturing corrosion-resistant and wear-resistant steel are as follows:

[0031] (1) Smelting process: The present invention adopts high Cr and appropriate amount of rare earth additives, adopts high purity smelting technology, and improves the size of steel inclusions and improves the inclusions through rare earth La and Ce, so that the steel plate has good corrosion resistance and wear performance.

[0032] (2) Rolling process: The present invention is designed to add a certain amount of Cr and Mo alloys, and the heating process ensures that the alloy elements are dissolved as much as possible. The heating temperature is controlled at 1180-1250°C. At the same time, the pinning effect of Nb carbides is used to refine the grains during the rolling process.

[0033] (3) Heat treatment process: The AC3 temperature is calculated based on the chemical composition of the steel. Under the premise of ensuring the solid solution of the alloy, the heating temperature is controlled to prevent abnormal grain growth. The multi-beam array jet constrained roller quenching is used to complete the phase transformation process and obtain the entire lath martensite structure, so that the steel plate has high strength, high hardness and excellent wear resistance. In order to eliminate the stress generated by the phase transformation during the quenching process of the steel plate, the steel plate needs to be tempered at 180°C to relieve stress.

[0034] According to the technical solution of the present invention, 8-60mm corrosion-resistant and wear-resistant steel can be produced to achieve the following performance indicators: alloy content ≤6wt.%, thickness 8-40mm, surface hardness 430-470HBW, and corrosion resistance and wear resistance under acidic conditions with a Ph value of 4-7 is more than twice that of conventional NM450. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a microstructure image of the corrosion-resistant and wear-resistant steel at 1 / 4 position in an embodiment of the present invention;

[0036] Figure 2 This is a microstructure image of the corrosion-resistant and wear-resistant steel at 1 / 2 position in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] Example 1

[0039] The present embodiment provides a corrosion-resistant wear-resistant steel and a manufacturing method thereof, which is obtained through smelting, continuous casting, rolling and heat treatment. According to the chemical composition requirements of the steel of the present invention and combined with the manufacturing process, wear-resistant steel of different specifications can be manufactured. The specific composition is shown in Table 1, and the sum of the above components is 100%;

[0040] Table 1 Chemical composition of various embodiments of the present invention (wt%)

[0041]

[0042] The smelted steel billet is used according to the method, and the method of controlled rolling air cooling + offline heat treatment is used to produce corrosion-resistant and wear-resistant steel plates. The specific implementation is as follows:

[0043] Example 1

[0044] The present embodiment provides a method for manufacturing corrosion-resistant, wear-resistant steel, wherein the molten steel smelted according to the composition of Example 1 in Table 1 is subjected to vacuum degassing treatment and then continuously cast, the continuous casting billet thickness is 220 mm, the billet is heated to a furnace temperature of 1180° C., kept warm for 180 min, and then taken out of the furnace for austenite recrystallization rolling and non-recrystallization zone rolling, wherein the final rolling temperature of the recrystallization zone is 1030° C., the final rolling temperature of the non-recrystallization zone is 840° C., the final rolling thickness of the steel plate is 8 mm, and after rolling, it is air-cooled to room temperature, and then offline quenching and tempering treatment are performed, the quenching temperature is 910° C., the heating time is 38 min; the tempering temperature is 180° C., and the tempering time is 50 min.

[0045] The microstructure images of the wear-resistant steel produced in Example 1 at 1 / 4 and 1 / 2 positions are as follows: Figure 1 and 2 As shown, the metallographic structure of the steel plate is mainly lath martensite, with fine and uniform grains, which ensures the stability of tensile and impact properties.

[0046] Example 2

[0047] The present embodiment provides a method for manufacturing corrosion-resistant, wear-resistant steel, wherein the molten steel smelted according to the composition of Example 2 in Table 1 is subjected to vacuum degassing treatment and then continuously cast, the continuous casting billet thickness is 320 mm, the billet is heated to a furnace temperature of 1200° C., kept warm for 220 min, and then taken out of the furnace for austenite recrystallization rolling and non-recrystallization zone rolling, wherein the final rolling temperature of the recrystallization zone is 1010° C., the final rolling temperature of the non-recrystallization zone is 840° C., the final rolling thickness of the steel plate is 40 mm, and after rolling, it is air-cooled to room temperature, and then offline quenching and tempering treatment are performed, and then offline quenching and tempering treatment are performed, the quenching temperature is 910° C., the heating time is 100 min; the tempering temperature is 180° C., and the tempering time is 50 min.

[0048] Example 3

[0049] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel, wherein the molten steel smelted according to the composition of Example 3 in Table 1 is subjected to vacuum degassing treatment and then continuously cast, the continuous casting billet thickness is 260 mm, the billet is heated to a furnace temperature of 1250°C, kept warm for 220 minutes, and then taken out of the furnace for austenite recrystallization rolling and non-recrystallization zone rolling, wherein the final rolling temperature of the recrystallization zone is 1040°C, the final rolling temperature of the non-recrystallization zone is 850°C, the final rolling thickness of the steel plate is 60 mm, air-cooled to room temperature after rolling, and then offline quenching and tempering treatment is performed. Then offline quenching and tempering treatment is performed, and then offline quenching and tempering treatment is performed, the quenching temperature is 900°C, the heating time is 150 minutes; the tempering temperature is 180°C, and the tempering time is 55 minutes.

[0050] Example 4

[0051] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel, wherein the molten steel smelted according to the composition of Example 4 in Table 1 is subjected to vacuum degassing treatment and then continuously cast, the continuous casting billet thickness is 370 mm, the billet is heated to a furnace temperature of 1200°C, kept warm for 200 minutes, and then taken out of the furnace for austenite recrystallization rolling and non-recrystallization zone rolling, wherein the final rolling temperature of the recrystallization zone is 1020°C, the final rolling temperature of the non-recrystallization zone is 860°C, the final rolling thickness of the steel plate is 80 mm, and after rolling, it is air-cooled to room temperature, and then offline quenching and tempering treatment is performed. Then offline quenching and tempering treatment is performed, and then offline quenching and tempering treatment is performed, the quenching temperature is 900°C, the heating time is 200 minutes; the tempering temperature is 180°C, and the tempering time is 45 minutes.

[0052] Example 5

[0053] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel, wherein the molten steel smelted according to the composition of Example 5 in Table 1 is subjected to vacuum degassing treatment and then continuously cast, the continuous casting billet thickness is 220 mm, the billet is heated to a furnace temperature of 1250°C, kept warm for 200 minutes, and then taken out of the furnace for austenite recrystallization rolling and non-recrystallization zone rolling, wherein the final rolling temperature of the recrystallization zone is 1030°C, the final rolling temperature of the non-recrystallization zone is 825°C, the final rolling thickness of the steel plate is 20 mm, and after rolling, it is air-cooled to room temperature, and then offline quenching and tempering treatment is performed, and then offline quenching and tempering treatment is performed. Then offline quenching and tempering treatment is performed, the quenching temperature is 900°C, the heating time is 50 minutes; the tempering temperature is 180°C, and the tempering time is 50 minutes.

[0054] The mechanical properties of the steel plates obtained in Examples 1-5 were tested, wherein the room temperature strength was measured according to the room temperature tensile test method for metal materials in GB / T228.1 and GB / T228.2; the low temperature impact toughness was measured according to the Charpy pendulum impact test method for metal materials in GB / T 229; the hardness was measured according to the Brinell hardness test for metal materials in GB / T 231.1 Part 1: Test method; the wear test was carried out on a friction and wear testing machine with a wear time of 15 min. The results are shown in Table 2.

[0055] Table 2 Test data

[0056]

[0057] It can be seen from Table 2 above that the Brinell hardness of the corrosion-resistant, wear-resistant steel of the present invention reaches above 430HB, the yield strength is greater than 1100MPa, the impact energy at -20℃ is greater than 40J, and the corrosion wear rate is ≤1.10×10-4mm3 / N·m. The corrosion-resistant, wear-resistant steel plate of the present invention not only has high strength, hardness and good low-temperature toughness, but also has excellent corrosion resistance and wear performance.

[0058] It can be seen that in order to overcome the sharp deterioration of the wear performance of conventional wear-resistant steel under humid and corrosive conditions, reduce the production cost of corrosion-resistant steel, break the assembly limitation technology, provide a corrosion-resistant wear-resistant steel and a manufacturing method thereof, adopt the "Cr+rare earth La, Ce specific alloy design + low defect continuous casting + high permeability rolling + multi-beam array jet constrained roller quenching" full-process new process, and develop a high corrosion and wear resistance steel plate NiRes 450-EW, alloy content ≤6wt.%, thickness 8-40mm, surface hardness 430-470HBW, corrosion resistance and wear performance under acidic conditions with Ph value of 4-7 are more than twice that of conventional NM450. At the same time, this wear-resistant steel has good processability and welding performance. The present invention can serve in humid corrosive environment conditions. The corrosion-resistant and wear-resistant steel can significantly improve the corrosion resistance and corrosion wear performance of conventional wear-resistant steel, and is widely used in the manufacture of engineering machinery, coal mining machinery, and urban garbage storage and transportation equipment. It not only greatly improves the service life cycle of conventional wear-resistant steel under corrosive conditions, but also has superior wear performance compared with conventional corrosion-resistant steel, reduces the replacement frequency of equipment parts, and effectively reduces production costs.

[0059] The present invention can replace conventional NM450 and be applied to export garbage trucks, which can significantly reduce the corrosion and wear rate, greatly improve the service life of equipment parts, reduce the replacement frequency, and effectively reduce the production cost.

[0060] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A corrosion-resistant, wear-resistant steel, characterized in that: The chemical composition of the wear-resistant steel is as follows by weight percentage: C≤0.22%, Si≤0.50%, Mn≤0.50%, P≤0.025%, S≤0.010%, Ni≤0.25%, Cr≤5.00%, Mo≤0.10%, rare earth+Nb≤0.1%, and the balance is Fe. The sum of the above components is 100%.

2. The corrosion-resistant, wear-resistant steel according to claim 1, characterized in that: The chemical composition of the wear-resistant steel is as follows by weight percentage: C: 0.18%, Si: 0.23%, Mn: 0.25%, P: 0.010%, S: 0.001%, Ni: 0.06%, Cr: 3.95%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the balance is Fe. The sum of the above components is 100%.

3. The corrosion-resistant, wear-resistant steel according to claim 1, characterized in that: The chemical composition of the wear-resistant steel is as follows by weight percentage: C: 0.19%, Si: 0.27%, Mn: 0.24%, P: 0.004%, S: 0.003%, Ni: 0.07%, Cr: 4.01%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the balance is Fe. The sum of the above components is 100%.

4. The corrosion-resistant, wear-resistant steel according to claim 1, characterized in that: The chemical composition of the wear-resistant steel is as follows by weight percentage: C: 0.18%, Si: 0.26%, Mn: 0.26%, P: 0.008%, S: 0.002%, Ni: 0.03%, Cr: 3.98%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the balance is Fe. The sum of the above components is 100%.

5. The corrosion-resistant, wear-resistant steel according to claim 1, characterized in that: The chemical composition of the wear-resistant steel is as follows by weight percentage: C: 0.21%, Si: 0.26%, Mn: 0.24%, P: 0.009%, S: 0.002%, Ni: 0.08%, Cr: 3.90%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the balance is Fe. The sum of the above components is 100%.

6. The corrosion-resistant, wear-resistant steel according to claim 1, characterized in that: The chemical composition of the wear-resistant steel is as follows by weight percentage: C: 0.20%, Si: 0.25%, Mn: 0.23%, P: 0.005%, S: 0.001%, Ni: 0.09%, Cr: 3.94%, Mo: 0.01%, rare earth + Nb ≤ 0.1%, and the balance is Fe. The sum of the above components is 100%.

7. The corrosion-resistant, wear-resistant steel according to any one of claims 1 to 6, characterized in that: The rare earth is a mixture of Ce and La.

8. The corrosion-resistant, wear-resistant steel according to any one of claims 1 to 6, characterized in that: The microstructure of this wear-resistant steel is lath martensite.

9. A method for manufacturing corrosion-resistant and wear-resistant steel according to claim 1, characterized in that: The details are as follows: Electric furnace smelting: add ferromolybdenum, nickel plate, ferroniobium, low carbon chromium, ferromanganese, ferrosilicon and rare earth ferrosilicon in sequence, and the smelting temperature is 1600-1620℃ to obtain molten steel; Pouring: pouring molten steel, the thickness of the ingot is 220-320mm; Slab heating: Heat the slab to 1180-1250℃, soaking time 30-50 minutes; Rolling: then rolling in the recrystallization zone and rolling in the non-recrystallization zone, wherein the final rolling temperature of the recrystallization zone rolling is 1000-1100°C, and the final rolling temperature of the non-recrystallization zone rolling is 790-950°C; Heat treatment process: quenching temperature is AC3+ (20-50) ℃, followed by tempering at 180 ℃, and the tempering time is 45-55min.

10. The method for manufacturing corrosion-resistant and wear-resistant steel according to claim 9, characterized in that: The quenching time in the heat treatment process is controlled as follows: When the steel plate thickness is ≤20mm, the heating time is plate thickness + 30min; when the steel plate thickness is >20mm, the heating time is 2.5 times the plate thickness.

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