A corrosion-resistant and wear-resistant steel and its manufacturing method

Abstract

This invention discloses a corrosion-resistant and wear-resistant steel and its manufacturing method, belonging to the technical field of wear-resistant steel and its preparation. The chemical composition of the wear-resistant steel, by weight percentage, is: 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%, with the balance being Fe, and the sum of the above components is 100%. A new process is adopted, using a specific alloy design of Cr + rare earth La and Ce + low-defect continuous casting + high-penetration rolling + multi-beam array jet constrained roll quenching, to produce wear-resistant steel with an alloy content ≤6 wt%, a thickness of 8-40 mm, and a surface hardness of 430-470 HBW. Under acidic conditions with a pH value of 4-7, its corrosion and wear resistance is more than twice that of conventional NM450, while also possessing good machinability and weldability.

Description

Technical Field

[0001] This invention relates to a wear-resistant steel and its manufacturing method, specifically to a corrosion-resistant and wear-resistant steel and its manufacturing method, belonging to the technical field of wear-resistant steel and its preparation. Background Technology

[0002] In fields such as land reclamation, waterway dredging, slurry and waste transportation, and power plants, a large number of solid particles cause a certain degree of wear on material surfaces during transportation. However, due to the presence of corrosive media, the failure mode of the material is not simply wear, but rather the combined effect of corrosion and wear. Corrosion wear refers to the loss of metallic materials caused by friction and wear in a corrosive environment. Material loss is the result of the combined influence of mechanical, chemical, and electrochemical factors and their interactions. Compared to corrosion and wear damage, the movement of the contact surfaces during corrosion wear not only directly wears down the material but also destroys the protective film on the material surface, causing the fresh material surface to continuously come into contact with corrosive fluids, thus accelerating corrosion and forming an interaction between corrosion and wear. Therefore, corrosion wear coupled damage is not merely a simple superposition of material corrosion and wear damage, but a significant increase in material loss caused by corrosion, wear, and their interactions.

[0003] Statistics show that corrosion wear (including erosion wear) accounts for approximately 13% of all wear losses. Because corrosion wear differs from simple mechanical wear and corrosion, corrosion-resistant alloys and wear-resistant alloys have different compositions, microstructures, and development paths. Corrosion-resistant alloys often involve adding alloying elements to enhance their spontaneous passivation ability, such as stainless steel; while wear-resistant alloys commonly use high-strength matrices and high-hardness second-phase reinforcement to improve the alloy's load-bearing capacity and resistance to ploughing, such as martensitic wear-resistant steels and alloy cast iron. The development of wear-resistant and corrosion-resistant alloys currently focuses primarily on the impact of media corrosion on micro-cutting or ploughing, and the developed steel grades are mainly used in components of water turbines and mining ball mills. Wear-resistant and corrosion-resistant steels specifically designed for conveying slurries or solid particles containing corrosive media are still relatively rare. Ordinary low-alloy wear-resistant steels exhibit excellent wear performance and also possess the advantages of low cost and good machinability, making them widely used in some engineering machinery equipment with severe wear.

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

[0005] Patent CN112159934A describes a corrosion-resistant and wear-resistant steel plate and its preparation method. This invention reduces the carbon content through alloy composition design and combines it with heat treatment processes to prepare a novel steel plate with excellent corrosion and wear resistance in acidic environments: under acidic conditions with a pH of 4-5, its corrosion and wear resistance is 2.5-3.0 times that of existing martensitic wear-resistant steels with Brinell hardness. However, the presence of inclusions in the steel during smelting affects the corrosion resistance and wear resistance of the steel plate, and this method does not treat the inclusions.

[0006] Patent CN114774772B describes a corrosion-resistant 500HB martensitic wear-resistant steel plate and its production method. However, the plate has a high carbon content, 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. During smelting, it is necessary to control the oxidation of Ti elements and other problems. At the same time, the influence of inclusions in the steel grade has not been solved.

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

[0008] The technical problem to be solved by this invention is to overcome the sharp deterioration of wear performance of conventional wear-resistant steel under humid and corrosive conditions, reduce the production cost of corrosion-resistant steel, break assembly limitations, and overcome the shortcomings of existing technologies. This invention provides a corrosion-resistant and wear-resistant steel and its manufacturing method. It employs a specific alloy design using Cr+Lanium (La) and Cerium (Ce) rare earth alloys, along with a process of low-defect continuous casting + high-penetration rolling + multi-beam array jet constrained roll quenching. The resulting wear-resistant steel has an alloy content ≤6wt%, a thickness of 8-40mm, and a surface hardness of 430-470HBW. Under acidic conditions with a pH value of 4-7, its corrosion and wear resistance is more than twice that of conventional NM450, while also possessing good machinability and weldability.

[0009] To solve the above technical problems, the present invention provides a corrosion-resistant and wear-resistant steel, the chemical composition of which, by weight percentage, is: 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%, with the balance being Fe, and the sum of the above components is 100%.

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

[0011] Furthermore, in the aforementioned corrosion-resistant and wear-resistant steel, the chemical composition of the wear-resistant steel by weight percentage is 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%, balance Fe, and the sum of the above components is 100%.

[0012] The aforementioned corrosion-resistant and wear-resistant steel has the following chemical composition 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%.

[0013] The aforementioned corrosion-resistant and wear-resistant steel has the following chemical composition 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, with the sum of all the above components being 100%.

[0014] The aforementioned corrosion-resistant and wear-resistant steel has the following chemical composition 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%.

[0015] The aforementioned corrosion-resistant and wear-resistant steel has the following chemical composition 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%, balance Fe, and the sum of all the above components is 100%.

[0016] In the aforementioned corrosion-resistant and wear-resistant steel, the rare earth element 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] This invention also provides a method for manufacturing corrosion-resistant and wear-resistant steel, as detailed below:

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

[0020] Casting: Molten steel is poured, and the billet thickness is 220-320mm;

[0021] Billet heating: Heat the slab to 1180-1250℃, and soak it for 30-50 minutes;

[0022] Rolling: Then, rolling is performed in the recrystallization zone and the non-recrystallization zone. The final rolling temperature in the recrystallization zone is 1000-1100℃, and the final rolling temperature in the non-recrystallization zone is 790-950℃.

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

[0024] Technical advantages: The quenching process of this invention adopts a multi-beam array jet constrained roller quenching process and uses the first set of roller pressure constrained online quenching system in China. This equipment is arranged between the outlet of the pre-straightening machine and the inlet of the original cooling equipment. Cooling manifolds are inserted between the upper constrained rollers. Each set of constrained rollers can be raised and lowered independently. The raising and lowering mechanism is controlled and precisely positioned by a servo hydraulic cylinder, realizing simultaneous cooling and constraining of the steel plate deformation during the cooling process. While the steel plate obtains high cooling strength, it also ensures high plate shape quality control.

[0025] The technical solution further defined in this 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 this invention are:

[0029] This invention, while considering the required strength and hardness properties, also takes into account the weldability of the material, controlling the C element content to ≤0.22%, adding Cr and Mo to improve the hardenability of the wear-resistant steel plate, ensuring the uniformity of the microstructure and hardness properties of the thickness section, and appropriately adding high Cr and appropriate amounts of rare earth elements lanthanum (La) and cerium (Ce) to the traditional wear-resistant steel. Through controlled rolling and offline heat treatment, Cr can play a role in quickly forming a passivation film and improving corrosion resistance. The addition of lanthanum (La) and cerium (Ce) rare earth alloys plays a role in purifying the molten steel, modifying inclusions, and microalloying, thereby modifying inclusions and reducing the corrosion sensitivity of the inclusion-matrix interface. Based on this, the new corrosion-resistant and wear-resistant steel plate obtains good corrosion and wear resistance properties.

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

[0031] (1) Smelting process: This invention uses high Cr and appropriate rare earth additives and adopts high-purity smelting technology. By using rare earth La and Ce to improve the size of steel inclusions and improve the inclusions, the steel plate can obtain good corrosion resistance and wear resistance.

[0032] (2) Rolling process: The present invention incorporates a certain amount of Cr and Mo alloys, and ensures that the alloy elements are dissolved as much as possible during the heating process. The heating temperature is controlled at 1180-1250℃. 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: Based on the chemical composition of the steel, the AC3 temperature is calculated. Under the premise of ensuring the solid solution of the alloy, the heating temperature is controlled to prevent abnormal grain growth. Multi-beam array jet constrained roller quenching is adopted to make the phase transformation process complete and obtain all the lath martensite structure, so that the steel plate has high strength, high hardness and excellent wear performance. 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℃ to relieve stress.

[0034] According to the technical solution described in this invention, 8-60mm corrosion-resistant and wear-resistant steel can be produced, achieving the following performance indicators: alloy content ≤6wt.%, thickness 8-40mm, surface hardness 430-470HBW, and corrosion and wear resistance performance is more than twice that of conventional NM450 under acidic conditions with pH value of 4-7. Attached Figure Description

[0035] Figure 1 This is a microstructure image of the corrosion-resistant and wear-resistant steel at a location 1 / 4 of its length 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 Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Example 1

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

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

[0041]

[0042] The smelted steel billets are processed using the controlled rolling and air cooling + offline heat treatment method to produce corrosion-resistant and wear-resistant steel plates, as described above. The specific implementation is as follows:

[0043] Example 1

[0044] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel. Molten steel smelted according to the composition of Example 1 in Table 1 is subjected to vacuum degassing and then continuously cast. The thickness of the continuously cast billet is 220mm. The billet is heated to a furnace temperature of 1180℃ and held for 180min before being taken out of the furnace for austenitic recrystallization rolling and non-recrystallization rolling. The final rolling temperature of the recrystallization zone is 1030℃, and the final rolling temperature of the non-recrystallization zone is 840℃. The final rolled thickness of the steel plate is 8mm. After rolling, the steel is air-cooled to room temperature and then subjected to offline quenching and tempering treatment. The quenching temperature is 910℃ and the heating time is 38min; the tempering temperature is 180℃ and the tempering time is 50min.

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

[0046] Example 2

[0047] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel. Molten steel smelted according to the composition of Example 2 in Table 1 is subjected to vacuum degassing and then continuously cast. The thickness of the continuously cast billet is 320mm. The billet is heated to a furnace temperature of 1200℃ and held for 220 minutes before being taken out of the furnace for austenitic recrystallization rolling and non-recrystallization rolling. The final rolling temperature of the recrystallization zone is 1010℃, and the final rolling temperature of the non-recrystallization zone is 840℃. The final rolled thickness of the steel plate is 40mm. After rolling, the steel is air-cooled to room temperature and then subjected to offline quenching and tempering treatment. The quenching temperature is 910℃ and the heating time is 100 minutes; the tempering temperature is 180℃ and the tempering time is 50 minutes.

[0048] Example 3

[0049] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel. Molten steel smelted according to the proportions in Example 3 of Table 1 is vacuum degassed and then continuously cast. The thickness of the continuously cast billet is 260 mm. The billet is heated to a furnace temperature of 1250°C, held for 220 min, and then removed from the furnace for austenitic recrystallization rolling and non-recrystallization rolling. The final rolling temperature in the recrystallization zone is 1040°C, and the final rolling temperature in the non-recrystallization zone is 850°C. The final rolled thickness of the steel plate is 60 mm. After rolling, it is air-cooled to room temperature, and then subjected to offline quenching and tempering. The quenching temperature is 900°C, and the heating time is 150 min; the tempering temperature is 180°C, and the tempering time is 55 min.

[0050] Example 4

[0051] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel. Molten steel smelted according to the proportions in Example 4 of Table 1 is vacuum degassed and then continuously cast. The thickness of the continuously cast billet is 370 mm. The billet is heated to a furnace temperature of 1200°C, held for 200 min, and then removed from the furnace for austenitic recrystallization rolling and non-recrystallization rolling. The final rolling temperature in the recrystallization zone is 1020°C, and the final rolling temperature in the non-recrystallization zone is 860°C. The final rolled thickness of the steel plate is 80 mm. After rolling, it is air-cooled to room temperature, and then subjected to offline quenching and tempering. The quenching temperature is 900°C, and the heating time is 200 min; the tempering temperature is 180°C, and the tempering time is 45 min.

[0052] Example 5

[0053] This embodiment provides a method for manufacturing corrosion-resistant and wear-resistant steel. Molten steel smelted according to the proportions in Example 5 of Table 1 is vacuum degassed and then continuously cast. The thickness of the continuously cast billet is 220 mm. The billet is heated to a furnace temperature of 1250°C, held for 200 min, and then removed from the furnace for austenitic recrystallization rolling and non-recrystallization rolling. The final rolling temperature in the recrystallization zone is 1030°C, and the final rolling temperature in the non-recrystallization zone is 825°C. The final rolled thickness of the steel plate is 20 mm. After rolling, it is air-cooled to room temperature, and then subjected to offline quenching and tempering treatment. The quenching temperature is 900°C, and the heating time is 50 min; the tempering temperature is 180°C, and the tempering time is 50 min.

[0054] The mechanical properties of the steel plates obtained in Examples 1-5 were tested. The room temperature strength was tested according to GB / T228.1 and GB / T228.2 Metallic Materials, Tensile Test at Room Temperature; the low temperature impact toughness was determined according to GB / T 229 Metallic Materials, Charpy Pendulum Impact Test; the hardness was determined according to GB / T 231.1 Metallic Materials, Brinell Hardness Test Part 1: Test Method; the wear test was conducted on a friction and wear testing machine for 15 minutes. The results are shown in Table 2.

[0055] Table 2 Test Data

[0056]

[0057] As can be seen from Table 2 above, the Brinell hardness of the corrosion-resistant and 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 and wear-resistant steel plate of the present invention not only has high strength, hardness and good low-temperature toughness, but also has excellent corrosion-resistant and wear-resistant properties.

[0058] Therefore, this invention aims to overcome the drastic deterioration of wear resistance of conventional wear-resistant steel under humid and corrosive conditions, reduce the production cost of corrosion-resistant steel, and break through assembly limitations. It provides a corrosion-resistant and wear-resistant steel and its manufacturing method, employing a novel full-process technology of "Cr + rare earth La and Ce specific alloy design + low-defect continuous casting + high-penetration rolling + multi-beam array jet constrained roll quenching," and developing a high-corrosion-wear-resistant steel plate NiRes. 450-EW, alloy content ≤6wt.%, thickness 8-40mm, surface hardness 430-470HBW, its corrosion and wear resistance is more than twice that of conventional NM450 under acidic conditions with a pH value of 4-7. This wear-resistant steel also possesses good machinability and weldability. It can be used in humid and corrosive environments. This corrosion-resistant and wear-resistant steel significantly improves the corrosion resistance and wear resistance of conventional wear-resistant steel, and is widely used in the manufacture of engineering machinery, coal mining machinery, and urban waste storage and transportation equipment. It not only greatly extends the service life of conventional wear-resistant steel under corrosive conditions, but also exhibits superior wear performance compared to conventional corrosion-resistant steel, reducing the frequency of equipment parts replacement and effectively lowering production costs.

[0059] This invention can replace the conventional NM450 and is applied to export garbage trucks. It significantly reduces the corrosion and wear rate, greatly improves the service life of equipment parts, reduces the replacement frequency, and effectively reduces production and manufacturing costs.

[0060] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for manufacturing corrosion-resistant and wear-resistant steel, characterized in that: The chemical composition of this wear-resistant steel, by weight percentage, is 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 elements: 0.001%, Nb: 0.02%, with the balance being Fe. The sum of the weight percentages of all the above components is 100%. The rare earth element is a mixture of Ce and La; The manufacturing method of the above-mentioned corrosion-resistant and wear-resistant steel is as follows: Electric furnace smelting: ferromolybdenum, nickel plate, ferroniobium, low-carbon chromium, ferromanganese, ferrosilicon, and rare earth ferrosilicon are added in sequence according to the formula. The smelting temperature at the furnace tapping temperature is 1600-1620℃ to obtain molten steel. Casting: Molten steel is poured, and the billet thickness is 220mm; Billet heating: Heat the billet to 1180℃, soak it for 30-50 minutes, hold it for 180 minutes, and then remove it from the furnace. Rolling: After exiting the furnace, the steel plate is rolled in the recrystallization zone and the non-recrystallization zone. The final rolling temperature of the recrystallization zone is 1030℃, and the final rolling temperature of the non-recrystallization zone is 840℃. The final rolling thickness of the steel plate is 8mm. After rolling, the steel plate is air-cooled to room temperature and then subjected to offline quenching and tempering. The quenching process adopts a multi-beam array jet constrained roller quenching process. The quenching time is controlled as follows: when the steel plate thickness is ≤20mm, the heating time is plate thickness + 30min. The quenching temperature is 910 DEG C, the heating time is 38 min, the tempering temperature is 180 DEG C, and the tempering time is 50 min; the microstructure of the wear-resistant steel is lath martensite, and the performance is as follows: yield strength 1145 MPa, surface hardness 468 HBW, -20 DEG C impact energy 51 J, and wear rate 1.20 x 10 -4 mm 3 / N·m.

2. A method for manufacturing corrosion-resistant and wear-resistant steel, characterized in that: The chemical composition of this wear-resistant steel, by weight percentage, is 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 elements: 0.002%, Nb: 0.03%, with the balance being Fe. The sum of the weight percentages of all the above components is 100%. The rare earth element is a mixture of Ce and La; The manufacturing method of the above-mentioned corrosion-resistant and wear-resistant steel is as follows: Electric furnace smelting: ferromolybdenum, nickel plate, ferroniobium, low-carbon chromium, ferromanganese, ferrosilicon, and rare earth ferrosilicon are added in sequence according to the formula. The smelting temperature at the furnace tapping temperature is 1600-1620℃ to obtain molten steel. Casting: Molten steel is poured, and the billet thickness is 320mm; Billet heating: Heat the billet to 1200℃, soak it for 30-50 minutes, hold it for 220 minutes, and then remove it from the furnace. Rolling: Then, the recrystallization zone rolling and the non-recrystallization zone rolling are carried out. The final rolling temperature of the recrystallization zone rolling is 1010℃, and the final rolling temperature of the non-recrystallization zone rolling is 840℃. The final rolling thickness of the steel plate is 40mm. After rolling, the steel plate is air-cooled to room temperature, and then offline quenching and tempering are performed. The quenching process adopts a multi-beam array jet constrained roller quenching process. The quenching time is controlled as follows: when the steel plate thickness is >20mm, the heating time is 2.5 times the plate thickness. The quenching temperature is 910℃, the heating time is 100min, the tempering temperature is 180℃, and the tempering time is 50min. The microstructure of the obtained wear-resistant steel is lath martensite, and its properties are: yield strength 1134 MPa, surface hardness 457 HBW, impact energy at -20℃ 47 J, and wear rate 1.15 × 10⁻⁶. -4 mm 3 / N·m.

3. A method for manufacturing corrosion-resistant and wear-resistant steel, characterized in that: The chemical composition of this wear-resistant steel, by weight percentage, is 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 elements: 0.002%, Nb: 0.01%, with the balance being Fe. The sum of the weight percentages of all the above components is 100%. The rare earth element is a mixture of Ce and La; The manufacturing method of the above-mentioned corrosion-resistant and wear-resistant steel is as follows: Electric furnace smelting: ferromolybdenum, nickel plate, ferroniobium, low-carbon chromium, ferromanganese, ferrosilicon, and rare earth ferrosilicon are added in sequence according to the formula. The smelting temperature at the furnace tapping temperature is 1600-1620℃ to obtain molten steel. Casting: Molten steel is poured, and the billet thickness is 260mm; Billet heating: Heat the billet to 1250℃, soak it for 30-50 minutes, hold it for 220 minutes, and then remove it from the furnace. Rolling: Then, the recrystallization zone rolling and the non-recrystallization zone rolling are carried out. The final rolling temperature of the recrystallization zone rolling is 1040℃, and the final rolling temperature of the non-recrystallization zone rolling is 850℃. The final rolling thickness of the steel plate is 60mm. After rolling, the steel plate is air-cooled to room temperature, and then offline quenching and tempering are performed. The quenching process adopts a multi-beam array jet constrained roller quenching process. The quenching time is controlled as follows: when the steel plate thickness is >20mm, the heating time is 2.5 times the plate thickness. The quenching temperature is 900℃, the heating time is 150min, the tempering temperature is 180℃, and the tempering time is 55min. The microstructure of the obtained wear-resistant steel is lath martensite, and its properties are as follows: yield strength 1127 MPa, surface hardness 464 HBW, impact energy at -20℃ 48 J, and wear rate 1.28 × 10⁻⁶. -4 mm 3 / N·m.

4. A method for manufacturing corrosion-resistant and wear-resistant steel, characterized in that: The chemical composition of this wear-resistant steel, by weight percentage, is 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 elements: 0.001%, Nb: 0.03%, with the balance being Fe. The sum of the weight percentages of all the above components is 100%. The rare earth element is a mixture of Ce and La; The manufacturing method of the above-mentioned corrosion-resistant and wear-resistant steel is as follows: Electric furnace smelting: ferromolybdenum, nickel plate, ferroniobium, low-carbon chromium, ferromanganese, ferrosilicon, and rare earth ferrosilicon are added in sequence according to the formula. The smelting temperature at the furnace tapping temperature is 1600-1620℃ to obtain molten steel. Casting: Molten steel is poured, and the billet thickness is 220mm; Billet heating: Heat the billet to 1250℃, soak it for 30-50 minutes, hold it for 200 minutes, and then remove it from the furnace; Rolling: Then, the recrystallization zone rolling and the non-recrystallization zone rolling are carried out. The final rolling temperature of the recrystallization zone rolling is 1030℃, and the final rolling temperature of the non-recrystallization zone rolling is 825℃. The final rolling thickness of the steel plate is 20mm. After rolling, the steel plate is air-cooled to room temperature, and then offline quenching and tempering are performed. The quenching process adopts a multi-beam array jet constrained roller quenching process. The quenching time is controlled as follows: when the steel plate thickness is ≤20mm, the heating time is plate thickness + 30min. The quenching temperature is 900℃, the heating time is 50min, the tempering temperature is 180℃, and the tempering time is 50min. The microstructure of the obtained wear-resistant steel is lath martensite, and its properties are: yield strength 1137 MPa, surface hardness 449 HBW, impact energy at -20℃ 51 J, and wear rate 1.14 × 10⁻⁶. -4 mm 3 / N·m.

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