High-strength wear-resistant steel and preparation process thereof

Abstract

The invention relates to the technical field of steel, in particular to high-strength wear-resistant steel and a preparation process thereof. The method comprises the following steps: S1, carrying out electric furnace smelting, LF refining and RH vacuum treatment on raw materials, and pouring into a steel billet through a continuous casting machine; s2, the steel billet is subjected to quenching and tempering treatment in sequence, and after hot rolling, steel is prepared; s3, uniformly mixing aminated aluminum oxide, modified graphene oxide and deionized water, carrying out ultrasonic treatment for 30-50 minutes, adding waterborne epoxy resin, a curing agent, a flatting agent and a defoaming agent, and uniformly mixing, so as to obtain a wear-resistant coating; and S4, the surface of the steel is coated with a wear-resistant coating, after drying, a wear-resistant coating is formed, the high-strength wear-resistant steel is obtained, the high-strength wear-resistant steel not only has excellent wear resistance, but also has excellent corrosion resistance, and the service life can be effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of steel materials, in particular to a high-strength wear-resistant steel material and a preparation process thereof. Background Art

[0002] As a structural material, high-strength steel is widely used in automobiles, ships, construction, mining machinery and other fields due to its excellent mechanical properties and durability. With the continuous advancement of industrial technology, the performance requirements for high-strength steel are increasing day by day.

[0003] However, although traditional high-strength steels can meet basic requirements in terms of wear resistance and corrosion resistance, as the use environment becomes increasingly complex, existing technologies still have some shortcomings in these aspects. Although many high-strength steels have increased their hardness by adding alloying elements, their wear resistance is still insufficient under extreme working conditions, especially in high temperature, impact and wear environments, resulting in accelerated wear of the material and affecting its service life. At the same time, steel is easily corroded by moisture and chemical media in humid or corrosive environments, leading to rust and loss of strength. Although existing surface treatment technologies can improve corrosion resistance to a certain extent, they often cannot achieve the ideal hydrophobic effect. Water droplets easily adhere to the surface of the material, further exacerbating corrosion.

[0004] Therefore, we propose a high-strength wear-resistant steel and a preparation process thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-strength wear-resistant steel and a preparation process thereof to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A preparation process for high-strength wear-resistant steel comprises the following steps:

[0008] Step S1: subjecting the raw materials to electric furnace smelting, LF refining and RH vacuum treatment, and casting into steel billets through a continuous casting machine;

[0009] Step S2: quenching and tempering the steel billet in sequence, and hot rolling it to produce steel;

[0010] Step S3: uniformly mixing the amino-treated aluminum oxide, modified graphene oxide, and deionized water, ultrasonically treating for 30-50 minutes, and adding a water-based epoxy resin, a curing agent, a leveling agent, and a defoaming agent to obtain a wear-resistant coating;

[0011] Step S4: coating the surface of the steel with a wear-resistant coating, and forming a wear-resistant coating after drying to obtain a high-strength wear-resistant steel.

[0012] Furthermore, the raw materials include the following elements in weight percentage: C: 0.2-0.4%, Si: 0.2-0.5%, Mn: 0.6-1.8%, Cr: 4.5-8.2%, Ni: 0.2-0.4%, Mo: 2.4-3.5%, Nb: 0.02-0.06%, V: 0.16-0.32%, Ti: 0.01-0.03%, P≤0.015%, S≤0.01%, N≤0.004%, and the balance is Fe.

[0013] Furthermore, in step S1, the process conditions for electric furnace smelting are: using a DC arc furnace and a steel tapping temperature of 1600-1700°C.

[0014] Furthermore, in step S1, the process conditions for LF refining are: temperature 1580-1650° C., white slag holding time 15-30 min, soft stirring using argon, and soft stirring time 8-15 min.

[0015] Furthermore, in step S1, the process conditions for the RH vacuum treatment are: vacuum degree 30-80 Pa, holding time 15-30 min.

[0016] Furthermore, in step S1, the process conditions of the continuous casting machine are: continuous casting molten steel temperature of 1550-1600°C, tundish superheat of 20-30°C, and casting machine casting speed of 0.5-1.0 m / min.

[0017] Furthermore, the thickness of the steel billet is 200-220 mm.

[0018] Furthermore, the quenching process conditions are: keeping the temperature at 700-800° C. for 5-6 hours, and immediately quenching in a quenching medium.

[0019] Furthermore, the tempering process conditions are: keeping warm at 200-350° C. for 12-24 hours, and air cooling to room temperature.

[0020] Furthermore, the starting temperature of the hot rolling is 1100-1300°C, and the final temperature is 800-880°C.

[0021] Furthermore, the wear-resistant coating includes the following components by weight: 50-70 parts of water-based epoxy resin, 5-10 parts of amino-aluminum oxide, 10-15 parts of modified graphene oxide, 30-50 parts of deionized water, 10-15 parts of curing agent, 0.1-0.3 parts of leveling agent, and 0.1-0.3 parts of defoaming agent.

[0022] Furthermore, the preparation method of the amino alumina is as follows:

[0023] Alumina is ultrasonically dispersed in a mixed solution of anhydrous ethanol and deionized water, 3-aminopropyltriethoxysilane is added and mixed evenly, reacted at 60-70° C. for 5-7 hours, and then centrifuged, washed, and dried to obtain amino-alumina.

[0024] Furthermore, the mass ratio of the aluminum oxide, anhydrous ethanol, deionized water and 3-aminopropyltriethoxysilane is 1:(15-20):(3-5):(2-4).

[0025] Furthermore, the preparation method of the modified graphene oxide is as follows:

[0026] Step A: ultrasonically dispersing graphene oxide in a mixed solution of anhydrous ethanol and deionized water, adding 3-mercaptopropyltriethoxysilane and mixing evenly, adjusting the pH of the system to 4-5, reacting at 70-80° C. for 3-5 hours, centrifuging, washing, and drying to obtain thiolated graphene oxide;

[0027] Step B: The thiol-modified graphene oxide, the fluorine-containing hyperbranched silicone and the photoinitiator are uniformly mixed, and the mixture is irradiated with ultraviolet light to obtain modified graphene oxide.

[0028] Furthermore, in step A, the mass ratio of graphene oxide, anhydrous ethanol, deionized water and 3-mercaptopropyltriethoxysilane is 1:(10-12):(2-4):(0.3-0.8).

[0029] Furthermore, in the step B, the mass ratio of the thiolated graphene oxide, the fluorinated hyperbranched silicone, and the photoinitiator is 1:(0.3-0.5):(0.01-0.03).

[0030] Furthermore, the preparation method of the fluorine-containing hyperbranched organosilicon is as follows:

[0031] Step (1): Under nitrogen protection, caffeic acid, 4-formylphenylboronic acid, chloroform and 5A molecular sieves are mixed uniformly, reacted at 60-70° C. for 10-12 hours, and then distilled under reduced pressure and dried to obtain vinylphenylboronic acid ester;

[0032] Step (2): vinylphenyl borate, 3-aminopropyltrimethoxysilane and anhydrous ethanol are uniformly mixed, glacial acetic acid is added, and the mixture is reacted at 40-50° C. for 22-24 hours. After filtering, washing and drying, the modified organosilicon is obtained;

[0033] Step (3): Under nitrogen protection, the modified organosilicon and 2,3,5,6-tetrafluorophenylenedimethanol are uniformly mixed, p-toluenesulfonic acid is added, and the mixture is reacted at 100-120° C. for 4-8 hours. After vacuum distillation, fluorine-containing hyperbranched organosilicon is obtained.

[0034] Furthermore, in the step (1), the mass ratio of caffeic acid, 4-formylphenylboronic acid, chloroform and 5A molecular sieve is 1:(0.9-1.1):(35-40):(0.7-0.8).

[0035] Furthermore, in step (2), the mass ratio of vinylbenzene borate, 3-aminopropyltrimethoxysilane, anhydrous ethanol and glacial acetic acid is 1: (0.6-0.8): (2-4): (0.2-0.4).

[0036] Furthermore, in the step (3), the mass ratio of the modified silicone to 2,3,5,6-tetrafluorophenylenediol is 1:(0.4-1.0).

[0037] Furthermore, in step (3), the mass of p-toluenesulfonic acid is 1-3% of the mass of the modified organosilicon.

[0038] Furthermore, in step B, the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, and the process conditions of ultraviolet irradiation are: irradiation wavelength 360-400nm, irradiation time 0.5-2.0h, irradiation intensity 20-35mW / cm 2 .

[0039] Furthermore, the wear-resistant coating has a thickness of 100-200 μm.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. A high-strength, wear-resistant steel material and a preparation process thereof of the present invention comprises the following steps: a dehydration condensation reaction of caffeic acid and 4-formylphenylboronic acid is performed to obtain vinylphenyl borate; the borate structure can interact with the metal surface during friction to form a protective film and a lubricating film, thereby significantly reducing friction and wear, and effectively preventing further wear and corrosion of the metal surface; a Schiff base-containing alkoxysilane, i.e., a modified organosilicon, is generated by reacting vinylphenyl borate with 3-aminopropyltrimethoxysilane; the Schiff base structure has strong adhesion, antibacterial and corrosion inhibition properties; the modified organosilicon is then reacted with the two hydroxyl groups of 2,3,5,6-tetrafluorophenylenedimethanol to obtain a fluorine-containing hyperbranched organosilicon; and the introduction of fluorine can effectively improve the water resistance and mechanical properties of the material;

[0042] Graphene oxide is surface-modified with 3-mercaptopropyltriethoxysilane to introduce mercapto groups, resulting in mercaptolated graphene oxide. This improves its reactivity and dispersibility, and can then undergo a mercapto-ene click reaction with vinyl groups in fluorinated hyperbranched silicone to obtain modified graphene oxide. This material not only exhibits excellent mechanical properties and wear resistance, but also good chemical stability and corrosion resistance.

[0043] Alumina is surface-modified by 3-aminopropyltriethoxysilane, introducing amino groups to obtain amino-treated alumina, which improves its dispersibility and compatibility, enabling it to better react with the remaining epoxy and carboxyl groups on the surface of modified graphene oxide. The modified graphene oxide can be evenly coated on the surface of the alumina to form a core-shell structure, effectively reducing the agglomeration between alumina and graphene oxide.

[0044] 2. A high-strength wear-resistant steel and a preparation process thereof of the present invention are characterized by combining modified graphene oxide as a lubricating component with amino-alumina as a wear-resistant component, wherein the two components play a synergistic role. The modified graphene oxide not only improves the lubrication performance of the material, reduces friction and wear, but also enhances the corrosion resistance of the material; while the amino-alumina provides excellent wear resistance and strength; these components are combined with water-based epoxy resin, and through the joint action of a curing agent and an auxiliary agent, a wear-resistant coating with excellent performance is finally obtained, which has excellent wear resistance, corrosion resistance and hydrophobicity, and can effectively extend the service life of the steel. DETAILED DESCRIPTION

[0045] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0046] In this embodiment, aluminum oxide: model DCA-300NS1, particle size 300nm, sourced from Dongguan Dongchao New Materials Technology Co., Ltd.; graphene oxide: model DN-20DY, average thickness 1-3nm, diameter 4-7μm, number of layers 2-5 layers, sourced from Zhejiang Zhitianawei New Materials Co., Ltd.; water-based epoxy resin: brand Dow DER-916; curing agent: model polyamide 650; leveling agent: model Keying KYC-615; defoaming agent: model BYK-028.

[0047] In the following examples and comparative examples, 1 part is equal to 10 g.

[0048] Example 1: A process for preparing high-strength wear-resistant steel, comprising the following steps:

[0049] Step S1: The raw materials are subjected to electric furnace smelting (using a DC arc furnace, a tapping temperature of 1600°C), LF refining (temperature of 1580°C, white slag holding time of 15 minutes, soft stirring using argon, soft stirring time of 8 minutes), and RH vacuum treatment (vacuum degree of 30 Pa, holding time of 15 minutes), and then cast into steel billets through a continuous casting machine (continuous casting molten steel temperature of 1550°C, tundish superheat of 20°C, casting machine casting speed of 0.5 m / min);

[0050] Step S2: The steel billet is kept at 700°C for 5 hours, immediately quenched in a quenching medium, kept at 200°C for 12 hours, air-cooled to room temperature, hot-rolled (starting temperature 1100°C, final temperature 800°C), and then air-cooled to room temperature to produce steel;

[0051] Step S3: 5 parts of amino-modified aluminum oxide, 10 parts of modified graphene oxide, and 30 parts of deionized water were mixed evenly, and ultrasonically treated for 30 minutes, and then 50 parts of water-based epoxy resin, 10 parts of curing agent, 0.1 parts of leveling agent, and 0.1 parts of defoaming agent were added and mixed evenly to obtain a wear-resistant coating;

[0052] Step S4: applying a wear-resistant coating on the surface of the steel material, and forming a wear-resistant coating after drying to obtain a high-strength wear-resistant steel material;

[0053] The raw materials include the following elements in weight percentages: C: 0.2%, Si: 0.2%, Mn: 0.6%, Cr: 4.5%, Ni: 0.2%, Mo: 2.4%, Nb: 0.02%, V: 0.16%, Ti: 0.01%, P≤0.015%, S≤0.01%, N≤0.004%, and the balance is Fe;

[0054] The preparation method of amination alumina is as follows:

[0055] 5 parts of aluminum oxide were ultrasonically dispersed in a mixed solution of 75 parts of anhydrous ethanol and 15 parts of deionized water, 10 parts of 3-aminopropyltriethoxysilane were added and mixed evenly, and the mixture was reacted at 60°C for 5 hours. After centrifugation, washing, and drying, amino-treated aluminum oxide was obtained.

[0056] The preparation method of modified graphene oxide is as follows:

[0057] Step A: ultrasonically dispersing 10 parts of graphene oxide in a mixed solution of 100 parts of anhydrous ethanol and 20 parts of deionized water, adding 3 parts of 3-mercaptopropyltriethoxysilane and mixing evenly, adjusting the system pH to 4, reacting at 70° C. for 3 hours, centrifuging, washing, and drying to obtain thiolated graphene oxide;

[0058] Step B: 10 parts of thiolated graphene oxide, 3 parts of fluorinated hyperbranched organosilicon, and 0.1 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone were mixed evenly, and then irradiated with ultraviolet light (irradiation wavelength 360 nm, irradiation time 0.5 h, irradiation intensity 20 mW / cm 2 ), to obtain modified graphene oxide;

[0059] The preparation method of fluorine-containing hyperbranched silicone is as follows:

[0060] Step (1): Under nitrogen protection, 3 parts of caffeic acid, 2.7 parts of 4-formylphenylboronic acid, 105 parts of chloroform and 2.1 parts of 5A molecular sieves were mixed uniformly, reacted at 60°C for 10 hours, and then distilled under reduced pressure and dried to obtain vinylphenyl borate;

[0061] Step (2): 3 parts of vinylphenyl borate, 1.8 parts of 3-aminopropyltrimethoxysilane and 6 parts of anhydrous ethanol were mixed evenly, 0.6 parts of glacial acetic acid was added, and the mixture was reacted at 40° C. for 22 hours. After filtering, washing and drying, the modified silicone was obtained;

[0062] Step (3): Under nitrogen protection, 3 parts of modified organosilicon and 1.2 parts of 2,3,5,6-tetrafluorophenylenedimethanol were mixed evenly, 0.03 parts of p-toluenesulfonic acid were added, and the mixture was reacted at 100° C. for 4 hours. After vacuum distillation, fluorine-containing hyperbranched organosilicon was obtained.

[0063] Example 2: A process for preparing high-strength wear-resistant steel, comprising the following steps:

[0064] Step S1: The raw materials are subjected to electric furnace smelting (using a DC arc furnace, a tapping temperature of 1650°C), LF refining (temperature of 1600°C, white slag holding time of 20 minutes, soft stirring using argon, soft stirring time of 10 minutes), and RH vacuum treatment (vacuum degree of 50 Pa, holding time of 20 minutes), and then cast into steel billets through a continuous casting machine (continuous casting molten steel temperature of 1580°C, tundish superheat of 25°C, casting machine casting speed of 0.8 m / min);

[0065] Step S2: The steel billet is kept at 750°C for 5.5 hours, immediately quenched in a quenching medium, tempered (kept at 300°C for 18 hours), air-cooled to room temperature, hot-rolled (starting temperature 1200°C, final temperature 850°C), and then air-cooled to room temperature to produce steel;

[0066] Step S3: 8 parts of amino-modified aluminum oxide, 12 parts of modified graphene oxide, and 40 parts of deionized water were mixed evenly, and ultrasonically treated for 40 minutes, and then 60 parts of water-based epoxy resin, 12 parts of curing agent, 0.2 parts of leveling agent, and 0.2 parts of defoaming agent were added and mixed evenly to obtain a wear-resistant coating;

[0067] Step S4: applying a wear-resistant coating on the surface of the steel material, and forming a wear-resistant coating after drying to obtain a high-strength wear-resistant steel material;

[0068] The raw materials include the following elements in weight percentages: C: 0.3%, Si: 0.4%, Mn: 1.2%, Cr: 6.4%, Ni: 0.3%, Mo: 3%, Nb: 0.04%, V: 0.25%, Ti: 0.02%, P≤0.015%, S≤0.01%, N≤0.004%, and the balance is Fe;

[0069] The preparation method of amination alumina is as follows:

[0070] 8 parts of aluminum oxide were ultrasonically dispersed in a mixed solution of 144 parts of anhydrous ethanol and 32 parts of deionized water, 24 parts of 3-aminopropyltriethoxysilane were added and mixed evenly, and the mixture was reacted at 65°C for 6 hours. After centrifugation, washing, and drying, amino-treated aluminum oxide was obtained.

[0071] The preparation method of modified graphene oxide is as follows:

[0072] Step A: ultrasonically dispersing 12 parts of graphene oxide in a mixed solution of 132 parts of anhydrous ethanol and 36 parts of deionized water, adding 6 parts of 3-mercaptopropyltriethoxysilane and mixing evenly, adjusting the pH of the system to 4.5, reacting at 75° C. for 4 hours, centrifuging, washing, and drying to obtain thiolated graphene oxide;

[0073] Step B: 12 ​​parts of mercapto-graphene oxide, 4.8 parts of fluorinated hyperbranched organosilicon, and 0.24 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone were mixed and irradiated with ultraviolet light (irradiation wavelength 380 nm, irradiation time 1 h, irradiation intensity 25 mW / cm 2 ), to obtain modified graphene oxide;

[0074] The preparation method of fluorine-containing hyperbranched silicone is as follows:

[0075] Step (1): Under nitrogen protection, 5 parts of caffeic acid, 5 parts of 4-formylphenylboronic acid, 190 parts of chloroform and 3.8 parts of 5A molecular sieves were mixed uniformly, reacted at 65°C for 11 hours, and then distilled under reduced pressure and dried to obtain vinylphenyl borate;

[0076] Step (2): 5 parts of vinylphenyl borate, 3.5 parts of 3-aminopropyltrimethoxysilane and 15 parts of anhydrous ethanol were mixed evenly, 1.5 parts of glacial acetic acid were added, and the mixture was reacted at 45° C. for 23 hours. After filtering, washing and drying, a modified organosilicon was obtained;

[0077] Step (3): Under nitrogen protection, 5 parts of modified silicone and 4 parts of 2,3,5,6-tetrafluorophenylenedimethanol were mixed evenly, 0.1 parts of p-toluenesulfonic acid were added, and the mixture was reacted at 110° C. for 6 hours. After vacuum distillation, fluorine-containing hyperbranched silicone was obtained.

[0078] Example 3: A process for preparing high-strength wear-resistant steel, comprising the following steps:

[0079] Step S1: The raw materials are subjected to electric furnace smelting (using a DC arc furnace, a tapping temperature of 1700°C), LF refining (temperature of 1650°C, white slag holding time of 30 minutes, soft stirring using argon, soft stirring time of 15 minutes), and RH vacuum treatment (vacuum degree of 80 Pa, holding time of 30 minutes), and then cast into steel billets through a continuous casting machine (continuous casting molten steel temperature of 1600°C, tundish superheat of 30°C, casting machine casting speed of 1.0 m / min);

[0080] Step S2: The steel billet is kept at 800°C for 6 hours, immediately quenched in a quenching medium, tempered (kept at 350°C for 24 hours), air-cooled to room temperature, hot-rolled (starting temperature 1300°C, final temperature 880°C), and then air-cooled to room temperature to produce steel;

[0081] Step S3: 10 parts of amino-modified aluminum oxide, 15 parts of modified graphene oxide, and 50 parts of deionized water were mixed evenly, and ultrasonically treated for 50 minutes, and then 70 parts of water-based epoxy resin, 15 parts of curing agent, 0.3 parts of leveling agent, and 0.3 parts of defoaming agent were added and mixed evenly to obtain a wear-resistant coating;

[0082] Step S4: applying a wear-resistant coating on the surface of the steel material, and forming a wear-resistant coating after drying to obtain a high-strength wear-resistant steel material;

[0083] The raw materials include the following elements in weight percentages: C: 0.4%, Si: 0.5%, Mn: 1.8%, Cr: 8.2%, Ni: 0.4%, Mo: 3.5%, Nb: 0.06%, V: 0.32%, Ti: 0.03%, P≤0.015%, S≤0.01%, N≤0.004%, and the balance is Fe;

[0084] The preparation method of ammoniated alumina is as follows:

[0085] 10 parts of aluminum oxide were ultrasonically dispersed in a mixed solution of 200 parts of anhydrous ethanol and 50 parts of deionized water, 40 parts of 3-aminopropyltriethoxysilane were added and mixed evenly, and the mixture was reacted at 70°C for 7 hours. After centrifugation, washing, and drying, amino-treated aluminum oxide was obtained.

[0086] The preparation method of modified graphene oxide is as follows:

[0087] Step A: ultrasonically dispersing 15 parts of graphene oxide in a mixed solution of 180 parts of anhydrous ethanol and 60 parts of deionized water, adding 12 parts of 3-mercaptopropyltriethoxysilane and mixing evenly, adjusting the pH of the system to 5, reacting at 80° C. for 5 hours, centrifuging, washing, and drying to obtain thiolated graphene oxide;

[0088] Step B: 15 parts of mercapto-graphene oxide, 7.5 parts of fluorinated hyperbranched organosilicon, and 0.45 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone were mixed and irradiated with ultraviolet light (irradiation wavelength 400 nm, irradiation time 2.0 h, irradiation intensity 35 mW / cm 2 ), to obtain modified graphene oxide;

[0089] The preparation method of fluorine-containing hyperbranched silicone is as follows:

[0090] Step (1): Under nitrogen protection, 8 parts of caffeic acid, 8.8 parts of 4-formylphenylboronic acid, 320 parts of chloroform and 6.4 parts of 5A molecular sieves were mixed uniformly, reacted at 70°C for 12 hours, and then distilled under reduced pressure and dried to obtain vinylphenyl borate;

[0091] Step (2): 8 parts of vinylphenyl borate, 6.4 parts of 3-aminopropyltrimethoxysilane and 32 parts of anhydrous ethanol were mixed evenly, 3.2 parts of glacial acetic acid were added, and the mixture was reacted at 50° C. for 24 hours. After filtering, washing and drying, a modified organosilicon was obtained;

[0092] Step (3): Under nitrogen protection, 8 parts of modified silicone and 8 parts of 2,3,5,6-tetrafluorophenylenedimethanol were mixed evenly, 0.24 parts of p-toluenesulfonic acid were added, and the mixture was reacted at 120° C. for 8 hours. After vacuum distillation, fluorine-containing hyperbranched silicone was obtained.

[0093] Comparative Example 1: A process for preparing high-strength wear-resistant steel, comprising the following processes:

[0094] Compared with Example 2, Comparative Example 1 replaces the modified graphene oxide in the wear-resistant coating with graphene oxide of the same mass, and the other steps are the same as those in Example 2.

[0095] Comparative Example 2: A process for preparing high-strength wear-resistant steel, comprising the following processes:

[0096] Compared with Example 2, no modified graphene oxide is added to the wear-resistant coating of Comparative Example 2, and the other steps are the same as those of Example 2.

[0097] Comparative Example 3: A process for preparing high-strength wear-resistant steel, comprising the following processes:

[0098] The preparation method of modified graphene oxide is as follows:

[0099] Step A: ultrasonically dispersing 12 parts of graphene oxide in a mixed solution of 132 parts of anhydrous ethanol and 36 parts of deionized water, adding 6 parts of 3-mercaptopropyltriethoxysilane and mixing evenly, adjusting the pH of the system to 4.5, reacting at 75° C. for 4 hours, centrifuging, washing, and drying to obtain thiolated graphene oxide;

[0100] Step B: 12 ​​parts of thiolated graphene oxide, 1.2 parts of fluorinated hyperbranched organosilicon, and 0.24 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone were mixed and irradiated with ultraviolet light (irradiation wavelength 380 nm, irradiation time 1 h, irradiation intensity 25 mW / cm 2 ), to obtain modified graphene oxide;

[0101] Compared with Example 2, in Comparative Example 3, only 1.2 parts of fluorine-containing hyperbranched silicone was added, and the other steps were the same as those in Example 2.

[0102] Experiment: The high-strength wear-resistant steels obtained in Examples 1-3 and Comparative Examples 1-3 were used to prepare samples, and their properties were tested and the test results were recorded:

[0103] Tensile strength test: Refer to GB / T 228.1-2021 "Tensile tests on metallic materials - Part 1: Test methods at room temperature", use an electronic universal testing machine to determine the tensile strength, and the tensile speed is 1 mm / min; Wear resistance test: A multi-function friction and wear tester (RtecMFT-4000) is used to measure the friction coefficient of the sample. The grinding material is GCr15 steel ball with a hardness of 60HRC. It is carried out in a room temperature atmospheric environment with a normal load of 20N, a reciprocating speed of 100mm / min, and a test time of 30min. After the test is completed, the wear scar morphology of the coating is observed and the wear volume is measured; Corrosion resistance test: Refer to GB / T 1771-2007 "Determination of resistance of paints and varnishes to neutral salt spray". The temperature in the salt spray chamber is 35°C, the test solution is a 5% by mass NaCl solution, the exposure time is 14d, and the surface of the sample is observed.

[0104] The test results are as follows:

[0105] Tensile strength / MPa <![CDATA[Wear volume / mm 3 > Corrosion resistance Example 1 1128 5.4 No discoloration or rust Example 2 1135 5.2 No discoloration or rust Example 3 1132 5.3 No discoloration or rust Comparative Example 1 1124 6.1 Significant corrosion and rust Comparative Example 2 1115 7.7 Significant corrosion and rust Comparative Example 3 1127 5.6 Cracks

[0106] According to the data in the above table, we can clearly draw the following conclusions:

[0107] 1. Compared with Examples 1-3, the wear resistance and corrosion resistance of the products obtained in Comparative Examples 1 and 2 are both reduced, indicating that the modified graphite oxide prepared by the present invention has better lubrication effect and corrosion resistance than graphene oxide; at the same time, by adding modified graphite oxide, the present invention can synergize with amino alumina to jointly improve the wear resistance and corrosion resistance of the material.

[0108] 2. Compared with Examples 1-3, the wear resistance and corrosion resistance of the product obtained in Comparative Example 3 are both reduced. It can be seen that when the addition amount of fluorine-containing hyperbranched silicone is reduced, the wear resistance and hydrophobicity of the modified graphene oxide obtained will decrease.

[0109] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A process for preparing high-strength wear-resistant steel, characterized by: The steps include: Step S1: subjecting the raw materials to electric furnace smelting, LF refining and RH vacuum treatment, and casting into steel billets through a continuous casting machine; Step S2: quenching and tempering the steel billet in sequence, and hot rolling it to produce steel; Step S3: uniformly mixing the amino-treated aluminum oxide, modified graphene oxide, and deionized water, ultrasonically treating for 30-50 minutes, and adding a water-based epoxy resin, a curing agent, a leveling agent, and a defoaming agent to obtain a wear-resistant coating; Step S4: coating the surface of the steel with a wear-resistant coating, and forming a wear-resistant coating after drying to obtain a high-strength wear-resistant steel.

2. The process for preparing a high-strength wear-resistant steel according to claim 1, characterized in that: In step S1, the process conditions for electric furnace smelting are: using a DC arc furnace and a steel tapping temperature of 1600-1700°C.

3. The process for preparing a high-strength wear-resistant steel according to claim 1, characterized in that: In step S2, the tempering process conditions are: keeping at 200-350° C. for 12-24 hours, and air cooling to room temperature.

4. The process for preparing a high-strength wear-resistant steel according to claim 1, characterized in that: In step S3, the wear-resistant coating includes the following components by weight: 50-70 parts of water-based epoxy resin, 5-10 parts of amino-aluminum oxide, 10-15 parts of modified graphene oxide, 30-50 parts of deionized water, 10-15 parts of curing agent, 0.1-0.3 parts of leveling agent, and 0.1-0.3 parts of defoaming agent.

5. The process for preparing a high-strength wear-resistant steel according to claim 4, characterized in that: The preparation method of the amino alumina is as follows: Alumina is ultrasonically dispersed in a mixed solution of anhydrous ethanol and deionized water, 3-aminopropyltriethoxysilane is added and mixed evenly, reacted at 60-70° C. for 5-7 hours, and then centrifuged, washed, and dried to obtain amino-alumina.

6. The process for preparing a high-strength wear-resistant steel according to claim 4, characterized in that: The preparation method of the modified graphene oxide is as follows: Step A: ultrasonically dispersing graphene oxide in a mixed solution of anhydrous ethanol and deionized water, adding 3-mercaptopropyltriethoxysilane and mixing evenly, adjusting the pH of the system to 4-5, reacting at 70-80° C. for 3-5 hours, centrifuging, washing, and drying to obtain thiolated graphene oxide; Step B: The thiol-modified graphene oxide, the fluorine-containing hyperbranched silicone and the photoinitiator are uniformly mixed, and the mixture is irradiated with ultraviolet light to obtain modified graphene oxide.

7. The process for preparing high-strength wear-resistant steel according to claim 6, characterized in that: In the step B, the mass ratio of the thiolated graphene oxide, the fluorinated hyperbranched silicone, and the photoinitiator is 1:(0.3-0.5):(0.01-0.03).

8. The process for preparing high-strength wear-resistant steel according to claim 7, characterized in that: The preparation method of the fluorine-containing hyperbranched organosilicon is as follows: Step (1): Under nitrogen protection, caffeic acid, 4-formylphenylboronic acid, chloroform and 5A molecular sieves are mixed uniformly, reacted at 60-70° C. for 10-12 hours, and then distilled under reduced pressure and dried to obtain vinylphenylboronic acid ester; Step (2): vinylphenyl borate, 3-aminopropyltrimethoxysilane and anhydrous ethanol are uniformly mixed, glacial acetic acid is added, and the mixture is reacted at 40-50° C. for 22-24 hours. After filtering, washing and drying, the modified organosilicon is obtained; Step (3): Under nitrogen protection, the modified organosilicon and 2,3,5,6-tetrafluorophenylenedimethanol are uniformly mixed, p-toluenesulfonic acid is added, and the mixture is reacted at 100-120° C. for 4-8 hours. After vacuum distillation, fluorine-containing hyperbranched organosilicon is obtained.

9. The process for preparing high-strength wear-resistant steel according to claim 8, characterized in that: In the step (3), the mass ratio of the modified silicone to 2,3,5,6-tetrafluorophenylenediol is 1:(0.4-1.0).

10. A high-strength wear-resistant steel produced according to the preparation process according to any one of claims 1 to 9.