A high wear-resistant medium manganese high aluminum steel and its heat treatment method and application

Abstract

The present invention belongs to the technical field of composite materials, and specifically relates to a medium-manganese high-aluminum steel with high wear resistance, its heat treatment method and application. The chemical composition of the medium-manganese high-aluminum steel with high wear resistance and its corresponding weight percentage are as follows: C is 0.4 - 0.5 wt%, Si is 0.01 - 0.05 wt%, Mn is 9.5 - 10.5 wt%, Al is 2.1 - 3.9 wt%, V + Mo is 0.2 - 0.3 wt%, Nb is 0.05 - 0.15 wt%, and the rest is Fe and inevitable impurities, and at the same time, 4 < Mn / Al < 6, 1 < Mo / V < 3, 1 < (V + Mo) / Si < 6 are satisfied. Its heat treatment method includes first performing water toughening treatment on the medium-manganese high-aluminum steel ingot, and then performing aging treatment to obtain the medium-manganese high-aluminum steel with high wear resistance. It improves the limitations such as low hardness and low-temperature brittle fracture of traditional manganese steel, and has the characteristics of uniform composition distribution, high stability, high hardness and good wear resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and in particular relates to a high-wear-resistant medium-manganese high-aluminum steel and a heat treatment method and application thereof. Background Art

[0002] Wear is caused by friction. The wear process and failure modes are extremely complex, and the wear mechanism is not fully understood. It is considered the most difficult of the three major material failure modes (wear, corrosion, and fatigue) to accurately assess and effectively control. The economic losses caused by wear are staggering. First, the economic losses caused by wear are reflected in the consumption of energy and materials. Second, the failure of mechanical components caused by wear results in even more difficult-to-calculate economic losses.

[0003] Wear-resistant steel plates are widely used in engineering, mining, construction, agriculture, cement production, ports, electric power and metallurgy, etc., which are subject to harsh working conditions and require high strength and high wear resistance. Such as bulldozers, loaders, excavators, dump trucks and various mining machinery, grabs, stackers and reclaimers, conveyor bending structures, etc. The purpose is to reduce the wear and consumption rate of mechanical parts, improve product life, and extend the time before mechanical products fail due to wear.

[0004] With the continuous development of science and technology and the in-depth exploration of unknown areas, the service conditions of wear-resistant steel are becoming more and more complex and harsh. Engineering equipment with extremely harsh working conditions not only requires higher wear resistance, but also has to withstand the interaction of other factors such as corrosion, fatigue, and impact. This puts higher requirements on the comprehensive performance of wear-resistant steel (such as welding, fatigue, corrosion, and processing and forming).

[0005] With the emergence of high-manganese steel, wear-resistant metal materials have made great progress. Subsequently, nickel-hard cast iron, high-chromium cast iron and other cast wear-resistant steel materials were developed, and wear resistance was further improved. With the rapid development of science and technology and the increasing tension in energy, resources and the environment, wear-resistant metal materials are developing towards rolled low-alloy wear-resistant steel with better overall performance and higher economic efficiency to meet the needs of more complex and special working conditions.

[0006] The earliest steel developed was ordinary high-manganese steel, with a manganese content of 10%-15%. Ordinary high-manganese steel has good work-hardening ability under strong impact loads. High-energy impact loads produce amorphous structures and nano-ultrafine austenite grains on the surface, rapidly increasing the surface hardness from 190-220HB to around 500HB, while the core still retains a highly tough austenite structure. This improves the surface wear resistance and utilizes the toughness of the austenite in the core to fully absorb impact and resist crack propagation. If the impact load is too small to produce sufficient work hardening, the initial strength is less than 400MPa, and the working surface is easily worn by the contacting material, resulting in poor wear resistance and easy deformation.

[0007] Medium manganese steel was developed based on high manganese steel. The purpose is to appropriately reduce the manganese content to reduce the stability of austenite, make it easier to work harden, and meet the requirements of applications with lower impact loads. The manganese content of medium manganese austenitic wear-resistant steel is generally 8%-9%. However, in actual production, medium manganese steel is prone to hot cracking during casting and heat treatment, and its safety is poor. At present, the main research direction of medium manganese steel is to use modification treatment to reduce the probability of hot cracking, that is, to add Cr, Mg, Nb and rare earth elements as composite modifiers to medium manganese steel to improve the microstructure and the morphology and distribution of carbides, which has achieved good results.

[0008] In recent years, researchers have also studied ultra-high manganese steels, which have manganese contents exceeding 20% ​​to stabilize the austenite structure and increase the carbon content to improve the structure and wear resistance of manganese steels. Researchers have found that modification techniques can also be applied to ultra-high manganese steels to refine the grains and improve the network distribution characteristics of eutectic carbides at grain boundaries, further improving the structure of ultra-high manganese steels and enhancing wear resistance.

[0009] At present, wear-resistant steel mainly includes austenitic wear-resistant steel, bainitic wear-resistant steel, martensitic wear-resistant steel, dual-phase wear-resistant steel, etc. China has made great progress in the research of wear-resistant steel, but the comprehensive performance of wear-resistant steel still needs to be improved.

[0010] The patented technology "Precipitation Strengthening Method for Improving the Wear Resistance of High Manganese Steel" (CN103509915A) describes a high manganese steel with the following chemical composition and mass percentages: 1.04wt% C, 12.7wt% Mn, 0.75wt% Si, 0.015wt% S, 0.078wt% P, with a Mn / C ratio of 12.21. The heat treatment process includes a single quenching, cooling, a second quenching, a third quenching, and heating and holding. The wear resistance of the high manganese steel prepared by the heat treatment method of the present invention is 1 to 2 times greater than that of water-toughened high manganese steel. While this technology improves the wear resistance of high manganese steel to a certain extent, the improvement range is limited and the heat treatment process is relatively complex, making it unfavorable for practical production.

[0011] The rolling method for direct one-step rolling of continuous casting billets of low-magnetic high manganese steel (CN101524706) patent technology, the chemical composition and mass percentage of the low-magnetic high manganese steel are as follows: 0.14 - 0.22wt%

[0012] C, 21.0 - 25.0wt% Mn, 1.5 - 2.5wt% Al, V ≤ 0.10wt%, and the rest are Fe and inevitable impurities. The rolling process of the present invention includes: step heating, descaling of billets, and hot rolling. The steel plate prepared by the present invention improves the surface quality and成材率 of high manganese steel plates, but the heat treatment process of this technology is relatively complex and is not conducive to high-efficiency large-scale industrial production.

[0013] Therefore, in order to simultaneously consider improving the comprehensive mechanical properties of manganese steel plates and ensuring simple process, reasonable economic cost and ensuring large-scale production, it is urgent to develop a new type of manganese steel material with different components and ratios. Summary of the Invention

[0014] To solve the deficiencies of the prior art, the present invention provides a high wear-resistant medium manganese high aluminum steel and its heat treatment method and application. The high wear-resistant medium manganese high aluminum steel provided by the present invention has excellent wear resistance and long service life.

[0015] The technical solution provided by the present invention is as follows:

[0016] A high wear-resistant medium manganese high aluminum steel, the chemical composition and the corresponding weight percentage are: C is 0.4 - 0.5wt%, Si is 0.01 - 0.05wt%, Mn is 9.5 - 10.5wt%, Al is 2.1 - 3.9wt%, V + Mo is 0.2 - 0.3wt%, Nb is 0.05 - 0.15wt%, and the rest are Fe and inevitable impurities, and at the same time satisfy 4 < Mn / Al < 6, 1 < Mo / V < 3, 1 < (V + Mo) / Si < 6, all are weight percentage ratios.

[0017] The above technical solution has a high aluminum addition amount, which improves the limitations of traditional manganese steel such as low hardness and low-temperature brittle fracture, and has the characteristics of uniform composition distribution, high stability, high hardness and good wear resistance.

[0018] The present invention also provides a heat treatment method for high wear-resistant medium manganese high aluminum steel, including the following steps:

[0019] 1)配料 according to the chemical composition and weight percentage of the high wear-resistant medium manganese high aluminum steel, melt with a vacuum induction furnace, pour the steel billet by die casting process, and forge or hot roll the obtained steel billet to obtain a high wear-resistant medium manganese high aluminum steel ingot;

[0020] 2)对步骤1)得到的所述高耐磨性中锰高铝钢铸锭先进行水韧处理,再进行时效处理,即得所述的高耐磨性中锰高铝钢。 It should be noted that there is an unclear expression "成材率" in the original text, which may need to be further clarified according to the actual situation. And the "配料" in step 1) of the heat treatment method translation should be more accurately expressed according to the specific meaning in the context, such as "Prepare materials according to...".

[0021] The above technical solution combines water toughening treatment and aging treatment, improving the wear resistance of medium manganese high-Al steel.

[0022] Preferably, the water toughening treatment includes the following steps:

[0023] a) Within the temperature range of T < 650 °C, place the alloy ingot in a heating furnace and heat the alloy ingot at a heating rate of VT1, where 80 °C / h ≤ heating rate VT1 ≤ 100 °C / h;

[0024] b) Keep it at a temperature of 650 °C ≤ T1 ≤ 800 °C for 1 - 3 h;

[0025] c) Within the temperature range of 800 °C < T < 1150 °C, heat the alloy ingot at a heating rate of VT2, where 100 °C / h ≤ heating rate VT2 ≤ 120 °C / h;

[0026] d) Keep it at a temperature of 1150 °C ≤ T2 ≤ 1400 °C for 1 - 3 h;

[0027] Among them, the holding time in step b) and step d) is determined by an empirical formula.

[0028] In the above technical solution:

[0029] The functions of steps a) and b) are: to perform stepped heating and holding treatment on the alloy, avoiding adverse effects on the alloy caused by the oxidation of some carbon in the steel.

[0030] The function of step c) is: to dissolve all carbides in the steel into austenite and prevent them from precipitating大量 from austenite, maintaining a uniform austenite state, and making it have good plasticity and toughness.

[0031] The function of step d) is: to promote the uniform distribution of carbon elements in the austenite structure and play a role in solution treatment, improving the comprehensive mechanical properties of the alloy.

[0032] The holding time can be determined according to the existing empirical formula: τ = 0.016δ[1.27(C + Si)];

[0033] In the formula: τ - holding time, unit: h; δ - wall thickness of the workpiece, unit: mm; C, Si - carbon content and silicon content in the steel respectively.

[0034] Specifically, the aging treatment includes the following steps: Subsequently, heat the ingot of medium manganese high-Al steel with high wear resistance obtained by water toughening treatment at 200 - 600 °C for 3 - 5 h and cool it to room temperature by air cooling, then the medium manganese high-Al steel with high wear resistance is obtained.

[0035] Further, the test piece can be tested by the following steps:

[0036] 3) Cut the test sample to the size of length × width × height = (100-200) × (100-200) × (200-400) (mm);

[0037] 4) After cutting, sand the sample using 400# to 2000# sandpaper until the surface is smooth and the scratches are uniform. Use a polishing paste with a particle size of 1.5 to 3 μm until the sample surface is mirror-like. Etch with 3 to 6% nitric acid for 25 to 45 seconds until the metal surface slightly changes color. Observe the microstructure under a light microscope. Periodically impact the sample with a load of 2 to 8 J at intervals of 5 to 15 seconds, pausing every 3 to 5 minutes to test the surface hardness. Measure the surface hardness of the sample at 5 to 8 points horizontally spaced 2 to 5 mm apart and take the average value. Record the final weight loss from the wear test.

[0038] The present invention also provides an application of the above-mentioned high-wear-resistant medium-manganese high-aluminum steel for use in preparing lining plates of jaw crushers or bucket teeth of excavators and other places with impact loads.

[0039] The roles of each element in medium manganese high Al wear-resistant steel are as follows:

[0040] C: A crucial element affecting the strength, hardness, and hardenability of wear-resistant steel. Typically, low C contents in martensitic steel form lath martensite, while those above 1% form flake martensite. Excessive C content in steel results in high-carbon martensite after heat treatment, which has high hardness but poor toughness. Too low a C content results in low hardness and poor wear resistance. Increasing C content impairs almost all properties except strength, so it should be minimized while maintaining strength.

[0041] Si: Exists as a solid solution in the steel matrix, increasing its strength. While its effect on hardenability is relatively weak, its effect is much greater when added to steel along with other elements than when added individually. Si reduces the diffusion rate of carbon in ferrite and increases the tempering stability of steel.

[0042] Al: Similar to Si, it exists as a solid solution in the steel matrix, increasing its strength. Al also has a strong deoxidizing effect, forming a very stable oxide. It also readily combines with nitrogen to form nitride particles such as AlN.

[0043] Mn: A strong austenite-forming element. Increasing its content can lower the ferrite transformation temperature, significantly improve austenite stability, and refine grains. However, high content is not conducive to the welding of wear-resistant steel.

[0044] Mo: Mo can be added to wear-resistant steel in appropriate amounts to increase hardenability. Its effect on hardenability is stronger than that of Cr but less so than that of Mn. Mo is a medium-strong carbide-forming element, primarily existing in steel as carbides, dispersed throughout the matrix and strengthening it. It also effectively refines the as-cast structure, improves cross-sectional uniformity, and enhances tempering stability.

[0045] Nb: It exists in the form of granular C and N compounds in steel, and mainly plays the role of grain refinement and precipitation strengthening. However, its addition amount must be reasonably controlled and combined with appropriate manufacturing process to fully exert its effect. Improper process control or improper addition amount may even damage the performance of the steel.

[0046] In summary, the medium manganese and high Al wear-resistant steel prepared by the present invention does not contain high-cost alloying elements such as Ni, Cu, Mo, and Cr, and does not add rare earth and nitrogen elements that are difficult to smelt. Good mechanical properties and good corrosion resistance can be obtained by using low-cost elements such as silicon, manganese, and aluminum. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a SEM image 1000 times larger than the medium manganese and high Al wear-resistant steel obtained in Example 1 of the present invention.

[0048] Figure 2 This is a SEM image 1000 times larger than the medium manganese and high Al wear-resistant steel obtained in Example 2 of the present invention.

[0049] Figure 3 This is a SEM image 1000 times larger than the medium manganese and high Al wear-resistant steel obtained in Example 3 of the present invention.

[0050] Figure 4 This is a SEM image of the 13Mn wear-resistant steel obtained in Example 4 of the present invention at a magnification of 1000 times. DETAILED DESCRIPTION

[0051] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0052] Example 1

[0053] The high wear-resistant medium manganese and high aluminum steel is chemically formulated according to the following elements and their weight percentages: C is 0.4wt%, Si is 0.05wt%, Mn is 9.5wt%, Al is 2.1wt%, V is 0.1wt%, Mo is 0.15wt%, Nb is 0.05wt%, and Fe is 87.65wt%.

[0054] The preparation and heat treatment method of high wear-resistant medium manganese high aluminum steel comprises the following steps:

[0055] 1)配料 according to the chemical composition and its weight percentage of the medium manganese high aluminum steel with high wear resistance, melt it in a vacuum induction furnace, pour the steel billet by die casting process, forge or hot roll the obtained steel billet, then obtain the ingot of medium manganese high aluminum steel with high wear resistance, and cut the ingot into (100×100×200) (mm);

[0056] 2) First, perform the following water toughening treatment on the ingot of medium manganese high aluminum steel with high wear resistance obtained in step 1):

[0057] a) At a temperature T = 300 °C, place the alloy ingot in a heating furnace and heat up the alloy ingot at a heating rate of 80 °C / h;

[0058] b) Keep it at a temperature of 650 °C for 1.8 h;

[0059] c) In the temperature range of 650 °C < T < 1150 °C, heat up the alloy ingot at a heating rate of 100 °C / h;

[0060] d) Keep it at a temperature of 1150 °C for 1.8 h.

[0061] 3) First, perform the following aging treatment on the ingot of medium manganese high aluminum steel with high wear resistance obtained in step 1):

[0062] Then, keep the ingot of medium manganese high aluminum steel with high wear resistance after water toughening treatment at 200 °C for 3 h and air cool it to room temperature, then obtain the medium manganese high aluminum steel with high wear resistance.

[0063] Determination of average hardness and weight loss:

[0064] Use the MLD-10 impact wear test machine testing device to perform periodic impact on the sample with a load of 2 J, the interval between impacts is 5 s, and pause knocking for 3 min, then detect the surface hardness and final weight loss of the sample. The surface hardness of the sample is measured at 5 points with a horizontal interval of 2 mm and the average value is taken, and the average hardness (54 HRC) and the weight loss per unit volume (1×10 6 mm 3 ) (90.65 mg) of the manganese steel are calculated.

[0065] Example 2

[0066] For the medium manganese high aluminum steel with high wear resistance, perform chemical batching according to the following elements and their weight percentages: C is 0.45 wt%, Si is 0.04 wt%, Mn is 10.0 wt%, Al is 2.4 wt%, V is 0.1 wt%, Mo is 0.12 wt%, Nb is 0.10 wt%, and Fe is 86.79 wt%.

[0067] The preparation and heat treatment method of the medium manganese high aluminum steel with high wear resistance includes the following steps:

[0068] 1)配料 according to the chemical composition and its weight percentage of the medium manganese and high aluminum steel with high wear resistance, melt it in a vacuum induction furnace, pour the steel billet by die casting process, forge or hot roll the obtained steel billet, thus obtaining the ingot of medium manganese and high aluminum steel with high wear resistance, and cut the ingot into (150×150×300) (mm);

[0069] 2) First, perform the following water toughening treatment on the ingot of medium manganese and high aluminum steel with high wear resistance obtained in step 1):

[0070] a) At a temperature T = 450 °C, place the alloy ingot in a heating furnace, and heat up the alloy ingot at a heating rate of 90 °C / h;

[0071] b) Keep it at a temperature of 700 °C for 2.9 h;

[0072] c) In the temperature range of 700 °C < T < 1150 °C, heat up the alloy ingot at a heating rate of 110 °C / h;

[0073] d) Keep it at a temperature of 1250 °C for 2.9 h.

[0074] 3) First, perform the following aging treatment on the ingot of medium manganese and high aluminum steel with high wear resistance obtained in step 1):

[0075] Keep the ingot of medium manganese and high aluminum steel with high wear resistance after water toughening treatment at 200 °C for 3 h and then air cool it to room temperature, thus obtaining the medium manganese and high aluminum steel with high wear resistance.

[0076] Determination of average hardness and weight loss:

[0077] Use the MLD-10 impact wear test machine testing device to perform periodic impact on the sample with a load of 2 J, with a period interval of 5 s, and pause knocking for 3 min, and detect the surface hardness and final weight loss of the sample. The surface hardness of the sample is measured at 5 points with a horizontal interval of 2 mm and the average value is taken, and the average hardness (89 HRC) and the weight loss per unit volume (1×10 6 mm 3 ) (29.48 mg) of the manganese steel are calculated.

[0078] Example 3

[0079] For the medium manganese and high aluminum steel with high wear resistance, perform chemical batching according to the following elements and their weight percentages: C is 0.5 wt%, Si is 0.45 wt%, Mn is 10.5 wt%, Al is 2.0 wt%, V is 0.1 wt%, Mo is 0.2 wt%, Nb is 0.15 wt%, and Fe is 86.10 wt%.

[0080] Preparation and heat treatment method of medium manganese high aluminum steel with high wear resistance, comprising the following steps:

[0081] 1)配料所述高耐磨性中锰高铝钢的化学成分及其重量百分含量,采用真空感应炉熔炼,用模铸工艺浇注钢坯,将所得钢坯锻造或热轧,即得高耐磨性中锰高铝钢铸锭,并将铸锭切割为(200×200×400)(mm); 按照 the chemical composition and its weight percentage content of the medium manganese high aluminum steel with high wear resistance, melt it using a vacuum induction furnace, pour the steel billet by die casting process, forge or hot roll the obtained steel billet, thus obtaining an ingot of medium manganese high aluminum steel with high wear resistance, and cut the ingot into (200×200×400) (mm);

[0082] 2)对步骤1)得到的所述高耐磨性中锰高铝钢铸锭先进行以下水韧处理: 2) First, perform the following water toughening treatment on the ingot of medium manganese high aluminum steel with high wear resistance obtained in step 1):

[0083] a)在温度T=600℃,将合金铸锭置于加热炉中,并以升温速度100℃ / h对合金铸锭进行升温处理; a) At a temperature T = 600 °C, place the alloy ingot in a heating furnace, and heat up the alloy ingot at a heating rate of 100 °C / h;

[0084] b)在温度800℃下,保温7.7h; b) Keep it at a temperature of 800 °C for 7.7 h;

[0085] c)在温度800℃<T<1150℃范围内,以升温速度120℃ / h对合金铸锭进行升温处理; c) Within the temperature range of 800 °C < T < 1150 °C, heat up the alloy ingot at a heating rate of 120 °C / h;

[0086] d)在温度1400℃下,保温7.7h。 d) Keep it at a temperature of 1400 °C for 7.7 h.

[0087] 3)对步骤1)得到的所述高耐磨性中锰高铝钢铸锭先进行以下时效处理: 3) First, perform the following aging treatment on the ingot of medium manganese high aluminum steel with high wear resistance obtained in step 1):

[0088] 对水韧处理出的高耐磨性中锰高铝钢铸锭随后进行200℃保温3h并采用空冷降至室温,即得所述的高耐磨性中锰高铝钢。 Subsequently, keep the ingot of medium manganese high aluminum steel with high wear resistance obtained by water toughening treatment at 200 °C for 3 h and then air cool it to room temperature, thus obtaining the medium manganese high aluminum steel with high wear resistance.

[0089] 平均硬度及失重量的测定: Measurement of average hardness and weight loss:

[0090] 采用MLD-10冲击磨损试验机测试装置,用载荷为2J的载荷对样品进行周期性冲击周期间隔为5s,并且冲击3min暂停敲击,检测样品表面硬度及最终失重量。样品表面硬度取横向同间隔2mm 的5个点进行测量并取其平均值,计算得到锰钢的平均硬度(124HRC)及单位体积(1×10 Use the MLD-10 impact wear testing machine test device to perform periodic impacts on the sample with a load of 2 J, with an interval of 5 s between impacts, and pause knocking after 3 min of impact, and detect the surface hardness and final weight loss of the sample. The surface hardness of the sample is measured at 5 points with a horizontal interval of 2 mm and the average value is taken, and the average hardness (124 HRC) of the manganese steel and the weight loss (25.65 mg) per unit volume (1×10 6 mm 3 )失重量(25.65mg)。 (25.65 mg) of weight loss.

[0091] 实施例4 Example 4

[0092] 为了验证按照本发明所制备中锰高Al耐磨钢的耐磨损性能,我们与市场上常用的高锰钢(13Mn钢)进行了比较。高锰钢(13Mn钢)经过1150℃保温2小时,然后水淬,再在400℃保温4小时空冷。 To verify the wear resistance of the medium manganese high-Al wear-resistant steel prepared according to the present invention, we compared it with the commonly used high manganese steel (13Mn steel) on the market. The high manganese steel (13Mn steel) was kept at 1150 °C for 2 hours, then water quenched, and then air cooled after being kept at 400 °C for 4 hours.

[0093] Determination of average hardness and weight loss:

[0094] The MLD-10 impact wear tester was used to test the sample with a load of 2J and a periodic impact interval of 5s. The impact was paused for 3 minutes to detect the surface hardness and final weight loss of the sample. The surface hardness of the sample was measured at 5 points with a horizontal interval of 2mm and the average value was taken to calculate the average hardness of manganese steel (98HRC) and the unit volume (1×10 6 mm 3 ) weight loss (61.43 mg).

[0095] The wear test results show that:

[0096] like Figure 1-4 As shown in the figure, after water-toughening and aging treatment, the medium manganese high aluminum steel (Examples 1-3) is mainly composed of austenite and a small amount of martensite phase, while the 13Mn (Example 4) is mainly composed of austenite and M7C3 phase. The difference in phase structure leads to a large difference in the weight loss of the alloy under similar hardness values. Among them, the hardness values ​​of Examples 1-3 of the present invention range from 54 to 124 HRC with the increase of water-toughening holding time, and the unit volume (1×10 6 mm 3 ) weight loss is between (25-91 mg), and when the hardness of 13Mn alloy is equivalent to that of Example 2, its weight loss per unit volume is about twice that of the present invention.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any 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 heat treatment method for high wear-resistant medium manganese high aluminum steel, characterized in that: It includes the following steps: 1)配料按照高耐磨性中锰高铝钢的化学成分及其重量百分含量进行,采用真空感应炉熔炼,用模铸工艺浇注钢坯,将所得钢坯锻造或热轧,从而得到高耐磨性中锰高铝钢铸锭。所述高耐磨性中锰高铝钢的化学成分及对应的重量百分含量为:C为0.4~0.5wt%,Si为0.01~0.05wt%,Mn为9.5~10.5wt%,Al为2.1~3.9wt%,V+Mo为0.2~0.3wt%,Nb为0.05~0.15wt%,其余为Fe和不可避免的杂质,且同时满足4<Mn / Al<6,1<Mo / V<3,1<(V+Mo) / Si<6; 2)对步骤1)得到的所述高耐磨性中锰高铝钢铸锭先进行水韧处理,再进行时效处理,即可得到所述的高耐磨性中锰高铝钢; The water toughening treatment includes the following steps: a)在温度T<650℃范围内,将合金铸锭置于加热炉中,并以升温速度VT1对合金铸锭进行升温处理,其中,80℃ / h≤升温速度VT1≤100℃ / h; b)在温度T1下,保温2~3h,其中,650℃≤T1≤800℃; c)在温度800℃<T<1150℃范围内,以升温速度VT2对合金铸锭进行升温处理,其中,100℃ / h≤升温速度VT2≤120℃ / h; d)在温度T2下,保温2~3h,其中,1150℃≤T2≤1400℃; 其中,步骤b)和步骤d)中的保温时间由经验公式决定: τ=0.016δ[1.27(C+Si)]; 式中:τ-保温时间,单位;h;δ-工件壁厚,单位;mm;C、Si-分别为钢中碳含量、硅含量。 2. The heat treatment method for high wear-resistant medium manganese and high aluminum steel according to claim 1, characterized in that: The aging treatment includes the following steps: The high wear-resistant medium manganese high aluminum steel ingot after water toughening treatment is then kept at 200 - 600℃ for 3 - 5h and air-cooled to room temperature to obtain the high wear-resistant medium manganese high aluminum steel. 3.一种根据权利要求1或2所述的方法得到的高耐磨性中锰高铝钢。 4. An application of the high wear-resistant medium manganese high aluminum steel according to claim 3, characterized in that: It is used to prepare the lining plate of a jaw crusher or the bucket teeth of an excavator.

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