High-hardness stainless steel material for preparing silk screen and preparation process of high-hardness stainless steel material

Abstract

The invention relates to the technical field of stainless steel, in particular to a high-hardness stainless steel material for preparing a wire mesh and a preparation technology thereof.The preparation technology comprises the following steps that under the protective atmosphere, 316L austenitic stainless steel, titanium nitride powder, ferroniobium and single-walled carbon nanotubes are evenly mixed and then subjected to heat preservation at the temperature of 1500-1600 DEG C for 20-25 min; then, ferrocerium, manganese powder, an electrolytic copper plate and aluminum-titanium-boron wires are sequentially added, the temperature continues to rise to 1600-1650 DEG C, heat preservation is conducted for 5-10 min, then refining is conducted for 20-30 min at the temperature of 1750-1800 DEG C, and a casting solution is obtained; sequentially carrying out deoxidation treatment, deslagging treatment, pouring treatment, annealing treatment and cooling on the casting solution to obtain a stainless steel sheet; and finally, the stainless steel sheet is subjected to pre-deformation treatment, and the high-hardness stainless steel material is obtained. Therefore, the prepared stainless steel is high in hardness, good in plasticity and toughness and wide in application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of stainless steel, and in particular to a high-hardness stainless steel material for preparing a wire mesh and a preparation process thereof. Background Art

[0002] Stainless steel refers to steel that is resistant to corrosion by weak corrosive media such as air, steam, and water, and chemically corrosive media such as acids, alkalis, and salts. It is also called stainless acid-resistant steel. In practical applications, steel that is resistant to corrosion by weak corrosive media is often called stainless steel, while steel that is resistant to corrosion by chemical media is called acid-resistant steel. Due to the difference in chemical composition between the two, the former is not necessarily resistant to corrosion by chemical media, while the latter is generally rust-resistant. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel. According to the metallographic structure, ordinary stainless steel can be divided into three categories: austenitic stainless steel, ferritic stainless steel, and martensitic stainless steel. Based on these three basic metallographic structures, duplex steel, precipitation hardening stainless steel, and high-alloy steel with an iron content of less than 50% have been derived for specific needs and purposes. Among them, the matrix of austenitic stainless steel is mainly austenitic structure with a face-centered cubic crystal structure, which is non-magnetic and is mainly strengthened by cold working.

[0003] Austenitic stainless steel has excellent mechanical properties such as high strength, good ductility, plasticity and corrosion resistance, and is widely used in nuclear power plants, aerospace, marine engineering, petrochemical, medical and construction fields. However, austenitic stainless steel also has some problems. For example, during cold bending, cold stamping and other forming processes, due to the high hardness of the material, the required forming force is large, which is prone to defects such as cracks and tears. At the same time, the material is more prone to brittle fracture when subjected to impact loads or dynamic loads, and sudden damage may occur in some application scenarios that need to withstand large impacts. That is, high-hardness stainless steel still has the problem of poor plasticity and toughness, which will make the stainless steel material have poor performance after being made into products such as wire mesh, thus limiting the application prospects of stainless steel materials.

[0004] Therefore, according to the above-mentioned related technologies, it is urgent to develop a high-hardness stainless steel material for preparing wire mesh and its preparation process. Summary of the invention

[0005] In view of this, the purpose of the present invention is to propose a high-hardness stainless steel material for preparing wire mesh and a preparation process thereof, so as to solve the problem that the high-hardness stainless steel material prepared by the prior art has poor plasticity and toughness when preparing products such as wire mesh.

[0006] Based on the above purpose, the present invention provides a high-hardness stainless steel material for preparing wire mesh and a preparation process thereof.

[0007] A preparation process of a high-hardness stainless steel material for a wire mesh comprises the following steps:

[0008] Step S1: in a protective atmosphere, 316L austenitic stainless steel, titanium nitride powder, ferroniobium and single-walled carbon nanotubes are uniformly mixed and then kept at 1500-1600° C. for 20-25 minutes to obtain a steel melt;

[0009] Step S2: under a protective atmosphere, ferrocerium, manganese powder, electrolytic copper plate, and aluminum titanium boron wire are added to the molten steel in sequence, and the temperature is continuously raised to 1600-1650° C. and kept at this temperature for 5-10 minutes, and then refined at 1750-1800° C. for 20-30 minutes to obtain a casting liquid;

[0010] Step S3: sequentially subjecting the casting liquid to deoxidation treatment, slag removal treatment, pouring treatment, and annealing treatment, and obtaining a stainless steel sheet after cooling;

[0011] Step S4: pre-deform the stainless steel sheet to obtain a high-hardness stainless steel material.

[0012] Preferably, the protective atmosphere is an argon atmosphere.

[0013] Preferably, the mass ratio of the 316L austenitic stainless steel, titanium nitride powder, ferroniobium and single-walled carbon nanotubes in step S1 is 95-100: 0.4-0.6: 0.1-0.8: 0.002-0.02.

[0014] Preferably, the niobium content in the ferroniobium in step S1 is 50%-65%.

[0015] Preferably, in step S2, the mass ratio of the molten steel, ferrocerium, manganese powder, electrolytic copper plate, and aluminum-titanium-boron wire is 95.5-101.4: 0.025-0.5: 0.01-8: 0.03-0.05: 0.02-0.03.

[0016] Preferably, the cerium content in the ferrocerium in step S2 is 21%-40%;

[0017] The copper content in the electrolytic copper plate in step S2 is 95%-99%;

[0018] The aluminum content in the aluminum-titanium-boron wire in step S2 is 90%-93%.

[0019] Preferably, the deoxidation treatment process in step S3 is to add a deoxidizer to the casting liquid at 1600-1650°C, and then stir for 10-20 minutes;

[0020] The mass ratio of the casting liquid to the deoxidizer is 100:0.2-0.4;

[0021] The deoxidizer is a silicon carbide deoxidizer.

[0022] Preferably, the thickness of the mold during the casting process in step S3 is 5-10 mm.

[0023] Preferably, the annealing temperature during the annealing treatment in step S3 is 950-1000° C.; the insulation time during the annealing treatment is 20-30 minutes.

[0024] Preferably, the pre-deformation treatment in step S4 is ultrasonic shot peening;

[0025] The peening gas pressure during the ultrasonic peening is 2-4MPa;

[0026] The peening time during the ultrasonic peening is 240-360s;

[0027] The peening distance during the ultrasonic peening is 50-100 mm.

[0028] Beneficial effects of the present invention:

[0029] The present invention provides a high-hardness stainless steel material for preparing a wire mesh and a preparation process thereof. The present invention effectively improves the plasticity, toughness and hardness of the stainless steel material by mixing and sintering a specific amount of 316L austenitic stainless steel, titanium nitride powder, ferroniobium, single-walled carbon nanotubes, ferrocerium, manganese powder, electrolytic copper plate and aluminum titanium boron wire by graded heating.

[0030] The further high-temperature refining in the present invention can effectively reduce the content of impurity elements in the stainless steel, and can also make the composition of the stainless steel more uniform, so as to ensure that the stainless steel has the expected corrosion resistance, strength and other properties; and the high-temperature process can improve the microstructure of the stainless steel, refine the grains or make the phase distribution more reasonable, remove the gas in the stainless steel melt, and enhance the mechanical properties of the material, such as improving the toughness and fatigue resistance of the material.

[0031] The annealing treatment at a relatively high temperature is beneficial to static recrystallization, and the grain refinement caused by static recrystallization can improve the strength and plasticity of the stainless steel material.

[0032] The ultrasonic shot peening treatment of stainless steel material of a specific thickness at room temperature in the present invention will cause gradient plastic deformation in the stainless steel sample, thereby greatly improving the yield strength and hardness of the stainless steel material. Therefore, compared with the prior art, the stainless steel material prepared by the present invention not only has high hardness, but also has good plasticity, toughness and broad application prospects. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0034] Example 1: A preparation process of a high-hardness stainless steel material for preparing a wire mesh is as follows:

[0035] S1: Under an argon atmosphere, 95 g of 316L austenitic stainless steel, 0.4 g of titanium nitride powder, 0.1 g of ferroniobium, and 0.002 g of single-walled carbon nanotubes were mixed uniformly and kept at 1500° C. for 20 min to obtain a steel melt; wherein the niobium content in the ferroniobium was 50%;

[0036] S2: In an argon atmosphere, 0.025g of ferrocerium, 0.01g of manganese powder, 0.03g of electrolytic copper plate, and 0.02g of aluminum titanium boron wire were added to 95.5g of molten steel in sequence, and the temperature was continued to rise to 1600°C and kept for 5 minutes, and then refined at 1750°C for 20 minutes to obtain a casting liquid; wherein the cerium content in the ferrocerium was 21%; the copper content in the electrolytic copper plate was 95%; and the aluminum content in the aluminum titanium boron wire was 90%;

[0037] S3: First, 0.2 g of silicon carbide deoxidizer was added to 100 g of casting liquid at 1600°C and stirred for 10 min, then slag removal was performed, and then poured into a mold with a thickness of 5 mm, and then annealing treatment was performed at a temperature of 950°C and a heat preservation time of 20 min, and finally a stainless steel sheet was obtained after natural cooling;

[0038] S4: The stainless steel sheet is subjected to ultrasonic shot peening at an air pressure of 2 MPa, a time of 240 s, and a distance of 50 mm to obtain a high-hardness stainless steel material.

[0039] Example 2: A preparation process of a high-hardness stainless steel material for preparing a wire mesh is as follows:

[0040] S1: In an argon atmosphere, 96 g of 316L austenitic stainless steel, 0.45 g of titanium nitride powder, 0.3 g of ferroniobium, and 0.008 g of single-walled carbon nanotubes were mixed evenly and then kept at 1520° C. for 22 min to obtain a steel melt; wherein the niobium content in the ferroniobium was 55%;

[0041] S2: In an argon atmosphere, 0.03g of ferrocerium, 2g of manganese powder, 0.035g of electrolytic copper plate, and 0.023g of aluminum titanium boron wire were added to 96.75g of molten steel in sequence, and the temperature was continued to rise to 1610°C and kept for 6 minutes, and then refined at 1760°C for 23 minutes to obtain a casting liquid; wherein the cerium content in the ferrocerium was 25%; the copper content in the electrolytic copper plate was 96%; and the aluminum content in the aluminum titanium boron wire was 91%;

[0042] S3: First, 0.25 g of silicon carbide deoxidizer was added to 100 g of casting liquid at 1610° C. and stirred for 13 min, then slag removal was performed, and then poured into a mold with a thickness of 6 mm, and then annealing treatment was performed at a temperature of 960° C. and a heat preservation time of 23 min, and a stainless steel sheet was obtained after natural cooling;

[0043] S4: The stainless steel sheet is subjected to ultrasonic shot peening at an air pressure of 2.5 MPa, a time of 290 s, and a distance of 60 mm to obtain a high-hardness stainless steel material.

[0044] Example 3: A preparation process of a high-hardness stainless steel material for preparing a wire mesh is as follows:

[0045] S1: In an argon atmosphere, 98 g of 316L austenitic stainless steel, 0.5 g of titanium nitride powder, 0.5 g of ferroniobium, and 0.01 g of single-walled carbon nanotubes were mixed uniformly and kept at 1550° C. for 23 min to obtain a steel melt; wherein the niobium content in the ferroniobium was 58%;

[0046] S2: In an argon atmosphere, 0.04g of ferrocerium, 5g of manganese powder, 0.04g of electrolytic copper plate, and 0.025g of aluminum titanium boron wire were added to 99.1g of molten steel in sequence, and the temperature was continued to rise to 1630°C and kept for 8min, and then refined at 1780°C for 25min to obtain a casting liquid; wherein the cerium content in the ferrocerium was 30%; the copper content in the electrolytic copper plate was 97%; and the aluminum content in the aluminum titanium boron wire was 91.7%;

[0047] S3: First, 0.3 g of silicon carbide deoxidizer was added to 100 g of casting liquid at 1630° C. and stirred for 15 min, then slag removal was performed, and then poured into a mold with a thickness of 8 mm, and then annealing treatment was performed at a temperature of 9800° C. and a heat preservation time of 25 min, and a stainless steel sheet was obtained after natural cooling;

[0048] S4: The stainless steel sheet is subjected to ultrasonic shot peening at an air pressure of 3 MPa, a time of 310 s, and a distance of 80 mm to obtain a high-hardness stainless steel material.

[0049] Example 4: A preparation process of a high-hardness stainless steel material for preparing a wire mesh is as follows:

[0050] S1: In an argon atmosphere, 99 g of 316L austenitic stainless steel, 0.55 g of titanium nitride powder, 0.7 g of ferroniobium, and 0.015 g of single-walled carbon nanotubes were mixed evenly and then kept at 1580°C for 24 minutes to obtain a steel melt; wherein the niobium content in the ferroniobium was 62%;

[0051] S2: In an argon atmosphere, 0.045g of ferrocerium, 7g of manganese powder, 0.045g of electrolytic copper plate, and 0.028g of aluminum titanium boron wire were added to 100.26g of molten steel in sequence, and the temperature was continued to rise to 1640°C and kept for 9 minutes, and then refined at 1790°C for 28 minutes to obtain a casting liquid; wherein the cerium content in the ferrocerium was 35%; the copper content in the electrolytic copper plate was 98%; and the aluminum content in the aluminum titanium boron wire was 92%;

[0052] S3: First, 0.35 g of silicon carbide deoxidizer was added to 100 g of casting liquid at 1640°C and stirred for 18 min, then slag removal was performed, and then poured into a mold with a thickness of 9 mm, and then annealing treatment was performed at a temperature of 990°C and a heat preservation time of 28 min, and a stainless steel sheet was obtained after natural cooling;

[0053] S4: The stainless steel sheet is subjected to ultrasonic shot peening at an air pressure of 3.5 MPa, a time of 340 s, and a distance of 90 mm to obtain a high-hardness stainless steel material.

[0054] Example 5: A preparation process of a high-hardness stainless steel material for preparing a wire mesh is as follows:

[0055] S1: In an argon atmosphere, 100 g of 316L austenitic stainless steel, 0.6 g of titanium nitride powder, 0.8 g of ferroniobium, and 0.02 g of single-walled carbon nanotubes were mixed uniformly and kept at 1600° C. for 25 min to obtain a steel melt; wherein the niobium content in the ferroniobium was 65%;

[0056] S2: In an argon atmosphere, 0.5g of ferrocerium, 8g of manganese powder, 0.05g of electrolytic copper plate, and 0.03g of aluminum titanium boron wire were added to 101.4g of molten steel in sequence, and the temperature was continued to rise to 1650°C and kept for 10min, and then refined at 1800°C for 30min to obtain a casting liquid; wherein the cerium content in the ferrocerium was 40%; the copper content in the electrolytic copper plate was 99%; and the aluminum content in the aluminum titanium boron wire was 93%;

[0057] S3: First, 0.4 g of silicon carbide deoxidizer was added to 100 g of casting liquid at 1650°C and stirred for 20 min, then slag removal was performed, and then poured into a mold with a thickness of 10 mm, and then annealing treatment was performed at a temperature of 1000°C and a heat preservation time of 30 min, and a stainless steel sheet was obtained after natural cooling;

[0058] S4: The stainless steel sheet is subjected to ultrasonic shot peening at an air pressure of 4 MPa, a time of 360 s, and a distance of 100 mm to obtain a high-hardness stainless steel material.

[0059] Comparative Example 1:

[0060] Compared with Example 1, this comparative example only replaces the "titanium nitride powder" added in the steel melt preparation process with "316L austenitic stainless steel", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a high-hardness stainless steel material is obtained.

[0061] Comparative Example 2:

[0062] Compared with Example 1, this comparative example only replaces the "single-walled carbon nanotubes" added in the steel melt preparation process with "316L austenitic stainless steel", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a high-hardness stainless steel material is obtained.

[0063] Comparative Example 3:

[0064] Compared with Example 1, this comparative example only replaces the "manganese powder" added in the casting liquid preparation process with "molten steel", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a high-hardness stainless steel material is obtained.

[0065] Comparative Example 4:

[0066] Compared with Example 1, this comparative example only replaces the "electrolytic copper plate" added in the casting liquid preparation process with "molten steel", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a high-hardness stainless steel material is obtained.

[0067] Comparative Example 5:

[0068] Compared with Example 1, this comparative example only replaces the "aluminum-titanium-boron wire" added in the casting liquid preparation process with "molten steel", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a high-hardness stainless steel material is obtained.

[0069] Comparative Example 6:

[0070] Compared with Example 1, this comparative example does not perform 20 minutes of 1750° C. refining during the preparation of the casting liquid. The remaining steps and parameters are the same and will not be repeated in this comparative example. Finally, a high-hardness stainless steel material is obtained.

[0071] Comparative Example 7:

[0072] Compared with Example 1, this comparative example only replaces the "silicon carbide deoxidizer" added in the preparation process of the stainless steel sheet with the "aluminum product deoxidizer", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a high-hardness stainless steel material is obtained.

[0073] Comparative Example 8:

[0074] Compared with Example 1, this comparative example only replaces the "mold powder with a thickness of 5 mm" used in the preparation process of the stainless steel sheet with a "mold with a thickness of 15 mm", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a high-hardness stainless steel material is obtained.

[0075] Comparative Example 9:

[0076] Compared with Example 1, this comparative example does not perform annealing treatment during the preparation of the stainless steel sheet, and the remaining steps and parameters are the same, which will not be repeated in this comparative example. Finally, a high-hardness stainless steel material is obtained.

[0077] Comparative Example 10:

[0078] Compared with Example 1, this comparative example does not perform ultrasonic shot peening during the preparation of the high-hardness stainless steel material. The remaining steps and parameters are the same and will not be repeated in this comparative example. Finally, a high-hardness stainless steel material is obtained.

[0079] Comparative Example 11:

[0080] Compared with Example 1, this comparative example only replaces the prepared "high hardness stainless steel material" with "316L austenitic stainless steel".

[0081] Performance Test:

[0082] Determination of tensile strength:

[0083] Referring to the determination standard of GB / T228.1-2010 "Metallic Material Tensile Test Part 1: Room Temperature Test Method", the high hardness stainless steel materials prepared in Examples 1 to 5, Comparative Examples 1 to 10 and the 316L austenitic stainless steel in Comparative Example 11 were processed into standard tensile specimens, and the tensile strength (MPa) of the standard tensile specimens was tested using a universal electronic tensile testing machine. The determination results are shown in Table 1.

[0084] Determination of yield strength:

[0085] Referring to the determination standard of GB / T228.1-2010 "Metallic Material Tensile Test Part 1: Room Temperature Test Method", the high hardness stainless steel materials prepared in Examples 1 to 5, Comparative Examples 1 to 10 and the 316L austenitic stainless steel in Comparative Example 11 were processed into standard tensile specimens, and the yield strength (MPa) of the standard tensile specimens was tested using a universal electronic tensile testing machine. The determination results are shown in Table 1.

[0086] Determination of hardness:

[0087] Referring to the determination standard of GB / T4340.1-2009 "Metallic Material Vickers Hardness Test Part 1: Test Method", the hardness (HV) test was performed on Examples 1 to 5 and Comparative Examples 1 to 10 using a THV-1MDTe hardness tester, with a load of 500 g and a holding time of 15 s. The determination results are shown in Table 1.

[0088] Determination of elongation:

[0089] Referring to the determination standard of GB / T228.1-2010 "Metallic Material Tensile Test Part 1: Room Temperature Test Method", the high hardness stainless steel materials prepared in Examples 1 to 5, Comparative Examples 1 to 10 and the 316L austenitic stainless steel in Comparative Example 11 were processed into standard tensile specimens, and the elongation (%) of the standard tensile specimens was tested using a universal electronic tensile testing machine. The determination results are shown in Table 1.

[0090] Determination of corrosion resistance:

[0091] Referring to the measurement standard of GB / T10125-2012 "Artificial atmosphere corrosion test salt spray test", the high hardness stainless steel materials prepared in Examples 1 to 5 of the present invention, Comparative Examples 1 to 10 and the 316L austenitic stainless steel in Comparative Example 11 were tested for corrosion resistance (h) using neutral salt spray, and the measurement results are shown in Table 1;

[0092] Table 1

[0093]

[0094] Data Analysis:

[0095] It can be seen from Table 1 that the high-hardness stainless steel material prepared in the embodiment of the present invention has better tensile strength, yield strength, elongation, hardness and corrosion resistance; that is, the high-hardness stainless steel material prepared in the embodiment of the present invention has higher hardness and also has better plasticity, toughness and corrosion resistance;

[0096] This may be because the titanium nitride added in the present invention has a very high hardness, which can increase the surface hardness of the stainless steel material and effectively reduce the friction coefficient, so that the stainless steel has a longer service life in an environment prone to friction. The added single-walled carbon nanotubes have ultra-high modulus and strength, which can play a role in bearing loads in stainless steel, prevent the expansion of cracks inside the material, thereby improving the yield strength and tensile strength of the stainless steel material; at the same time, it can also absorb more energy without brittle fracture and prevent the corrosive medium from contacting the stainless steel matrix, thereby improving the fatigue resistance and corrosion resistance of the material. Titanium nitride and single-walled carbon nanotubes can also synergize with the ferroniobium added at the same time, so that the toughness, yield strength and tensile strength of the stainless steel material are greatly improved. The addition of ferrocerium can increase the number of niobium precipitates in niobium-containing steel, reduce their size, and disperse them in the steel matrix, increasing the fine grain strengthening and dispersion strengthening of microalloying elements, thereby improving the mechanical properties and corrosion resistance of stainless steel materials. Manganese powder can improve the strength and toughness of stainless steel, enhance the stability of austenite, reduce phase changes during processing, and improve the cold working performance of stainless steel. The copper in the electrolytic copper plate can improve the corrosion resistance of stainless steel, especially in some environments containing reducing media; and copper can improve the antibacterial properties of stainless steel, and is also beneficial to improving the cutting performance of the material. Aluminum titanium boron wire has the effect of refining grains in stainless steel, which can improve the strength and toughness of stainless steel, improve the welding performance of stainless steel, and reduce the probability of defects such as welding cracks. At the same time, this fine grain structure also helps to improve the fatigue resistance of stainless steel. The further high-temperature refining in the present invention can effectively reduce the content of impurity elements (such as sulfur, phosphorus, etc.) in stainless steel, and can also make the composition of stainless steel more uniform, to ensure that stainless steel has the expected corrosion resistance, strength and other properties; and the high-temperature process can improve the microstructure of stainless steel, refine grains or make phase distribution more reasonable, remove gas in stainless steel melt, and enhance the mechanical properties of materials, such as improving the toughness and fatigue resistance of materials. The annealing treatment at a higher temperature of the present invention is conducive to static recrystallization, and the grain refinement caused by static recrystallization will improve the strength and plasticity of stainless steel materials. The ultrasonic shot peening treatment of a stainless steel material of a specific thickness at room temperature can cause gradient plastic deformation in the stainless steel sample, thereby greatly improving the yield strength, hardness and other properties of the stainless steel material.

[0097] In comparative example 1, the "titanium nitride powder" added in the process of preparing the steel melt is replaced by "316L austenitic stainless steel"; in comparative example 2, the "single-walled carbon nanotube" added in the process of preparing the steel melt is replaced by "316L austenitic stainless steel"; as can be seen from Table 1, the tensile strength, yield strength, elongation, hardness and corrosion resistance of the stainless steel materials prepared by them are all reduced compared with those in Example 1. This may be because the titanium nitride added in the present invention has a very high hardness, which can increase the surface hardness of the stainless steel material and effectively reduce the friction coefficient, so that the stainless steel has a longer service life in an environment prone to friction. The added single-walled carbon nanotube has an ultra-high modulus and strength, which can play a role in bearing loads in stainless steel, prevent the expansion of cracks inside the material, thereby improving the yield strength and tensile strength of the stainless steel material; at the same time, it can also absorb more energy without brittle fracture and prevent the corrosive medium from contacting the stainless steel matrix, thereby improving the material's fatigue resistance and corrosion resistance. Titanium nitride and single-walled carbon nanotubes can also synergize with the niobium iron added at the same time, so that the toughness, yield strength and tensile strength of the stainless steel material are greatly improved.

[0098] In comparative example 3, the "manganese powder" added in the process of preparing the casting liquid is replaced by "molten steel"; in comparative example 4, the "electrolytic copper plate" added in the process of preparing the casting liquid is replaced by "molten steel"; in comparative example 5, the "aluminum-titanium-boron wire" added in the process of preparing the casting liquid is replaced by "molten steel"; as can be seen from Table 1, the tensile strength, yield strength, elongation, hardness and corrosion resistance of the stainless steel materials prepared by them are all reduced compared with those in Example 1. This may be due to the fact that the addition of ferrocerium can increase the number of niobium precipitates in niobium-containing steel, reduce their size, and disperse them in the matrix of steel, thereby increasing the fine grain strengthening and dispersion strengthening of microalloying elements, thereby improving the mechanical properties and corrosion resistance of stainless steel materials. Manganese powder can improve the strength and toughness of stainless steel, enhance the stability of austenite, reduce phase changes during processing, and improve the cold processing performance of stainless steel. The copper in the electrolytic copper plate can improve the corrosion resistance of stainless steel, especially in some environments containing reducing media; and copper can improve the antibacterial properties of stainless steel, and is also beneficial to improving the cutting performance of the material. Aluminum titanium boron wire has the effect of refining the grains in stainless steel, which can improve the strength and toughness of stainless steel, improve the welding performance of stainless steel, and reduce the probability of defects such as welding cracks. At the same time, this fine grain structure also helps to improve the fatigue resistance of stainless steel.

[0099] Comparative Example 6 did not perform 20 minutes of 1750°C refining during the preparation of the casting liquid. It can be seen from Table 1 that compared with Example 1, the tensile strength, yield strength, elongation, hardness and corrosion resistance of the stainless steel material prepared therefrom are all reduced. This may be because the further high-temperature refining in the present invention can effectively reduce the content of impurity elements (such as sulfur, phosphorus, etc.) in the stainless steel, and can also make the composition of the stainless steel more uniform, so as to ensure that the stainless steel has the expected corrosion resistance, strength and other properties; and the high-temperature process can improve the microstructure of the stainless steel, refine the grains or make the phase distribution more reasonable, remove the gas in the stainless steel melt, and enhance the mechanical properties of the material, such as improving the toughness and fatigue resistance of the material.

[0100] In Comparative Example 7, the "silicon carbide deoxidizer" added during the preparation of the stainless steel sheet is replaced by an "aluminum product deoxidizer". It can be seen from Table 1 that compared with Example 1, the tensile strength, yield strength, elongation, hardness and corrosion resistance of the stainless steel material prepared therefrom are all reduced. This may be because compared with the aluminum product deoxidizer, the silicon carbide deoxidizer is more conducive to improving the performance of the stainless steel material of the present invention.

[0101] In Comparative Example 8, the "mold powder with a thickness of 5 mm" used in the preparation process of the stainless steel sheet is replaced by a "mold with a thickness of 15 mm"; in Comparative Example 10, ultrasonic shot peening is not performed during the preparation process of the high-hardness stainless steel material. It can be seen from Table 1 that compared with Example 1, the tensile strength, yield strength, elongation, hardness and corrosion resistance of the stainless steel materials prepared by them are all reduced. In the present invention, ultrasonic shot peening of stainless steel materials of a specific thickness at room temperature will cause gradient plastic deformation in the stainless steel sample, thereby greatly improving the yield strength and hardness and other properties of the stainless steel material.

[0102] Comparative Example 9 did not perform annealing during the preparation of the stainless steel sheet. It can be seen from Table 1 that compared with Example 1, the tensile strength, yield strength, elongation, hardness and corrosion resistance of the stainless steel material prepared therefrom are all reduced. This may be because the annealing treatment at a higher temperature in the present invention is conducive to static recrystallization, and the grain refinement caused by static recrystallization will improve the strength and plasticity of the stainless steel material.

[0103] In Comparative Example 11, the prepared "high hardness stainless steel material" is replaced with "316L austenitic stainless steel". It can be seen from Table 1 that compared with 316L austenitic stainless steel, the high hardness stainless steel material prepared in the embodiment of the present invention has significantly better tensile strength, yield strength, elongation, hardness and corrosion resistance; that is, the high hardness stainless steel material prepared in the embodiment of the present invention has higher hardness while also having better plasticity, toughness and corrosion resistance.

[0104] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0105] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A process for preparing high-hardness stainless steel material for wire mesh, characterized in that: The following steps are involved: Step S1: in a protective atmosphere, 316L austenitic stainless steel, titanium nitride powder, ferroniobium and single-walled carbon nanotubes are uniformly mixed and then kept at 1500-1600° C. for 20-25 minutes to obtain a steel melt; Step S2: under a protective atmosphere, ferrocerium, manganese powder, electrolytic copper plate, and aluminum titanium boron wire are added to the molten steel in sequence, and the temperature is continuously raised to 1600-1650° C. and kept at this temperature for 5-10 minutes, and then refined at 1750-1800° C. for 20-30 minutes to obtain a casting liquid; Step S3: sequentially subjecting the casting liquid to deoxidation treatment, slag removal treatment, pouring treatment, and annealing treatment, and obtaining a stainless steel sheet after cooling; Step S4: pre-deform the stainless steel sheet to obtain a high-hardness stainless steel material.

2. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The protective atmosphere is an argon atmosphere.

3. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The mass ratio of the 316L austenitic stainless steel, titanium nitride powder, ferroniobium and single-walled carbon nanotubes in step S1 is 95-100: 0.4-0.6: 0.1-0.8: 0.002-0.

02.

4. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The niobium content in the ferroniobium in step S1 is 50%-65%.

5. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The mass ratio of the molten steel, ferrocerium, manganese powder, electrolytic copper plate and aluminum titanium boron wire in step S2 is 95.5-101.4: 0.025-0.5: 0.01-8: 0.03-0.05: 0.02-0.

03.

6. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The cerium content in the ferrocerium in step S2 is 21%-40%; The copper content in the electrolytic copper plate in step S2 is 95%-99%; The aluminum content in the aluminum-titanium-boron wire in step S2 is 90%-93%.

7. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The deoxidation treatment process in step S3 is to add a deoxidizer to the casting liquid at 1600-1650°C, and then stir for 10-20 minutes; The mass ratio of the casting liquid to the deoxidizer is 100:0.2-0.4; The deoxidizer is a silicon carbide deoxidizer.

8. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The thickness of the mold during the pouring process in step S3 is 5-10 mm.

9. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The annealing temperature during the annealing treatment in step S3 is 950-1000° C.; the insulation time during the annealing treatment is 20-30 minutes.

10. The process for preparing high-hardness stainless steel material for preparing wire mesh according to claim 1, characterized in that: The pre-deformation treatment in step S4 is ultrasonic shot peening; The peening gas pressure during the ultrasonic peening is 2-4MPa; The peening time during the ultrasonic peening is 240-360s; The peening distance during the ultrasonic peening is 50-100 mm.

Images