High-toughness wear-resistant high-manganese steel as well as preparation method and application thereof

Abstract

The invention discloses high-toughness wear-resistant high-manganese steel as well as a preparation method and application thereof, and belongs to the technical field of wear-resistant cast steel and heat treatment thereof. The high-toughness wear-resistant high manganese steel comprises the following chemical components in percentage by mass: 0.8 to 1.4 percent of C, 0.3 to 0.9 percent of Si, 10 to 17 percent of Mn, 0.5 to 1.5 percent of Cr, 0.03 to 0.18 percent of Zr, less than or equal to 0.032 percent of P, less than or equal to 0.040 percent of S and the balance of Fe and inevitable impurities. And 3 * 10 <-6 > < = [Zr] [C] wt% < = 16 * 10 <-6 >. By optimizing alloy components and a water toughening heat treatment process, the high-manganese steel with fine grains is obtained by utilizing a liquation Zr (C, N) phase, the yield strength is 415.2-512.3 Mpa, and the high-manganese steel is particularly suitable for preparing wear-resistant parts under the working condition of medium-high stress impact abrasive wear.

Description

Technical Field

[0001] The invention belongs to the technical field of wear-resistant cast steel and heat treatment thereof, and specifically relates to high-strength and toughness wear-resistant high manganese steel and a preparation method and application thereof. Background Art

[0002] High manganese steel is one of the oldest wear-resistant materials. Its structure in use is austenite, with good toughness and low hardness. However, under strong impact conditions, the surface hardness of high manganese steel can be increased from the initial 200HB to more than 500HB, thus showing good wear resistance. The characteristics of high manganese steel being hard on the outside and tough on the inside under medium and high stress impact abrasive wear conditions make it widely used as parts such as jaw plates of large jaw crushers, crushing walls and mortar walls of large cone crushers. However, high manganese steel has low yield strength and is easy to deform during initial loading, making subsequent maintenance and disassembly difficult. The increase in the strength of metal materials is often accompanied by a decrease in toughness. How to significantly improve the yield strength of high manganese steel while still having high toughness and wear resistance is a difficult problem that needs to be solved in the field of steel wear-resistant materials.

[0003] Chinese patent CN118326288A discloses a wear-resistant high manganese steel lining material and its preparation method. The deformation resistance of high manganese steel is improved by adding appropriate amounts of alloying elements such as Mo, W, and V. Mo, W, and V mainly exist in the form of precipitated phases, that is, the yield strength of the material is improved by utilizing the dispersion strengthening effect of the precipitated phases. However, in order to avoid the precipitation of precipitated phases at the grain boundaries or excessive size causing a significant decrease in impact toughness, it is necessary to keep the temperature at 260℃-450℃ for 5-8 hours, which significantly increases the production cost of high manganese steel.

[0004] Chinese patent CN118272735A discloses a Fe-Mn-Cr-CN high manganese steel and a preparation method thereof. By introducing the interstitial solid solution strengthening element N, appropriately extending the holding time of the steel ingot, and increasing the final forging temperature, a high manganese steel with a yield strength of 520MPa and a U-notch impact energy of 377J can be obtained without aging treatment. However, the composition of Fe-Mn-Cr-CN high manganese steel contains up to 7wt% Cr. In addition, its preparation process involves vacuum melting and high temperature forging. Therefore, the production difficulty and production cost of Fe-Mn-Cr-CN high manganese steel are relatively high, which is not conducive to the promotion of practical engineering applications.

[0005] Chinese patent CN110468343B discloses a TiC precipitation reinforced high manganese steel-based composite material and its preparation process. The high hardness of TiC makes the yield strength of the high manganese steel-based composite material reach 400-530MPa. However, excessive TiC splits the austenite matrix, resulting in a V-notch impact energy of the high manganese steel-based composite material of 13-49J. The low toughness makes the TiC precipitation reinforced high manganese steel-based composite material only suitable for the preparation of wear-resistant parts under low impact conditions.

[0006] Chinese patent CN108262465B discloses a method for manufacturing a wear-resistant impact crusher hammer. High manganese steel is used as the substrate, and multiple hard alloy points are set on the working surface of the hammer to improve the deformation resistance and wear resistance of the entire component. However, the addition of alloy columns will cause a sharp increase in the production cost of the component. In addition, in order to ensure that the alloy column does not explode during the rapid cooling of the hammer body, it is necessary to optimize the size and distribution of the alloy column, and the complex production process further increases the production cost.

[0007] Therefore, the present invention is proposed to solve the contradiction between the strength (yield strength) and toughness matching of existing high manganese steel materials and the production cost under high stress impact abrasive wear conditions. Summary of the invention

[0008] In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a high-strength, tough, wear-resistant high-manganese steel.

[0009] Another object of the present invention is to provide a method for preparing high-strength, tough and wear-resistant high manganese steel, wherein the high manganese steel has Si, Mn and Cr as main alloying elements, and an appropriate amount of Zr element is added, and after appropriate furnace temperature, pouring temperature and water toughening treatment, a complex phase structure with fine grains and micro / nano-sized Zr(C,N) hard phases evenly distributed on the austenite matrix can be obtained. The refinement of the grains and the dispersed distribution of the Zr(C,N) hard phase make the high manganese steel have high yield strength, high toughness and excellent wear resistance.

[0010] Another object of the present invention is to provide an application of the above-mentioned high-strength, toughness, wear-resistant high manganese steel, which is suitable for manufacturing wear-resistant parts under medium and high stress impact abrasive wear conditions such as liners of medium and large ball mills, jaw plates of jaw crushers, crushing walls and mortar walls of cone crushers.

[0011] The present invention adopts the following technical solutions:

[0012] A high-strength, toughness, wear-resistant high manganese steel has the following chemical compositions by mass percentage: C: 0.8-1.4%, Si: 0.3-0.9%, Mn: 10-17%, Cr: 0.5-1.5%, Zr: 0.03-0.18%, P≤0.032%, S≤0.040%, and the remainder is Fe and unavoidable impurities.

[0013] Preferably, the chemical composition of the high-strength, toughness and wear-resistant high manganese steel is: C: 0.8-1.1%, Si: 0.4-0.8%, Mn: 10.5-15.5%, Cr: 0.5-1.0%, Zr: 0.05-0.12%, P≤0.025%, S≤0.035%, and the remainder is iron and unavoidable impurities.

[0014] Preferably, the chemical composition of the high-strength, toughness and wear-resistant high manganese steel is: C: 1.0%, Si: 0.7%, Mn: 14.0%, Cr: 1.0%, Zr: 0.09%, P: 0.025%, S: 0.034%, and the remainder is iron and unavoidable impurities.

[0015] Preferably, the chemical composition of the high-strength, toughness, wear-resistant high manganese steel contains Zr and C that meet the following conditions: 3×10 -6 ≤[Zr][C]wt%≤16×10 -6 .

[0016] Preferably, the chemical composition of the high-strength, toughness, wear-resistant high manganese steel contains Zr and C that meet the following conditions: 4×10 -6 ≤[Zr][C]wt%≤14.3×10 -6 .

[0017] Preferably, the high-strength, toughness, and wear-resistant high-manganese steel has fine grains, and micro / nano-sized Zr(C,N) hard phases are evenly distributed in the austenite matrix.

[0018] Preferably, the high-strength, toughness, and wear-resistant high manganese steel has a yield strength of 415.2-512.3 MPa, and a U-notch impact absorption energy of 100.2-122.3 J.

[0019] A method for preparing high-strength, toughness, wear-resistant high manganese steel comprises the following steps:

[0020] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, and the composition of the molten steel is adjusted to within the error range of the designed composition, and then the molten steel is taken out of the furnace;

[0021] S2) inoculation treatment: placing an inoculant composed of a zirconium-iron alloy inside the ladle, and inoculating the molten steel obtained in step S1 by a ladle-injection method to obtain molten steel to be poured;

[0022] S3) casting: pouring the molten steel obtained in step S2 through a pouring gate, solidifying and cooling to obtain a casting;

[0023] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent to a heat treatment furnace for heating, heat preservation, and water cooling to room temperature to obtain the casting.

[0024] Preferably, the furnace tapping temperature of the molten steel in step S1 is 1480°C.

[0025] Preferably, the preparation method of the inoculant in step S2 is as follows: the ferro-zirconium alloy is crushed into particles with a diameter of ≤3 mm by mechanical grinding and dried, and then wrapped with iron foil to obtain the inoculant.

[0026] Preferably, the pouring temperature of the molten steel in step S3 is 1430°C.

[0027] Preferably, the solution temperature of the water toughening treatment in step S4 is 1050°C-1100°C, and the holding time is 4-8h.

[0028] Preferably, the pig iron, scrap steel, pure iron metal and ferroalloy in step S1 are well-known commercial common raw materials and can be purchased from the market.

[0029] The above-mentioned high-strength, toughness, wear-resistant high manganese steel is used in the manufacture of wear-resistant parts.

[0030] Preferably, the high-strength, toughness, wear-resistant high manganese steel is used in manufacturing wear-resistant parts under medium and high stress impact abrasive wear conditions.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] The high-strength, tough and wear-resistant high manganese steel prepared by the present invention is a high manganese steel with fine grains and micro / nano-sized Zr (C, N) hard phases uniformly distributed on the austenite matrix, with Si, Mn and Cr as the main alloying elements, an appropriate amount of Zr element added, and appropriate casting process and water-toughening heat treatment process. Zr (C, N) as a heterogeneous phase can promote the nucleation of γ-Fe, and its high melting point can inhibit the growth of grains during the water-toughening treatment, thereby obtaining fine grains. The refinement of the grains can simultaneously improve the yield strength and impact toughness of the material. In addition, the dispersed Zr (C, N) can inhibit dislocation movement, improve the yield strength of the material, and weaken the micro-cutting behavior of the abrasive. Therefore, the high manganese steel prepared by the present invention has a yield strength of 415.2-512.3MPa, and the U-notch impact absorption energy can reach 100.2-122.3J, showing excellent deformation resistance and wear resistance.

[0033] The high-strength, tough, wear-resistant high-manganese steel provided by the present invention has low alloying cost, simple preparation method, and easy control. It has excellent comprehensive mechanical properties combined with low manufacturing cost and has broad application prospects.

[0034] The high-strength, toughness, wear-resistant high manganese steel prepared by the invention is particularly suitable for manufacturing wear-resistant parts under medium and high stress impact abrasive wear conditions such as lining plates of medium and large ball mills, crushing walls and mortar walls of cone crushers. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the metallographic structure morphology of the high manganese steel produced in Example 3 of the present invention.

[0036] Figure 2 This is the metallographic structure morphology of the Zr-free high manganese steel produced in Comparative Example 1. DETAILED DESCRIPTION

[0037] The following is a detailed description of the present invention by way of examples. However, the scope of the present invention is not limited to the following examples. For process parameters not specifically noted, conventional techniques may be used.

[0038] The raw materials used in the embodiments, such as pig iron, scrap steel, pure iron metal and ferroalloy, are all well-known commercial common raw materials and can be purchased from the market.

[0039] The preparation method of the inoculant ferro-zirconium alloy is as follows: the ferro-zirconium alloy is crushed into particles with a diameter of ≤5 mm by mechanical grinding, and the particles are dried and then wrapped with iron foil.

[0040] Example 1: A high-strength, wear-resistant high-manganese steel

[0041] The chemical composition and mass content of the high-strength, toughness, wear-resistant high manganese steel are as follows: C: 0.8%, Si: 0.4%, Mn: 10.5%, Cr: 0.5%, Zr: 0.05%, P: 0.020%, S: 0.028%, and the balance is iron and unavoidable impurities, [Zr][C]wt%=4.0×10 -6 .

[0042] The preparation method of the high-strength, toughness, wear-resistant high manganese steel comprises the following steps:

[0043] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, the composition of molten steel is adjusted to within the error range of the designed composition, the temperature of the molten steel reaches 1480°C, and then it is discharged from the furnace;

[0044] S2) inoculation treatment: placing an inoculant made of ferro-zirconium alloy inside the ladle, and inoculating the molten steel obtained in step S1 by the ladle-injection method to obtain molten steel to be poured;

[0045] S3) casting: cooling the molten steel obtained in step S2 to 1430° C., pouring through a pouring gate, solidifying and cooling to obtain a casting;

[0046] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent into a heat treatment furnace, heated to 1050° C., kept at this temperature for 8 hours, and then water-cooled to room temperature to obtain the casting.

[0047] Example 2: A high-strength, wear-resistant high-manganese steel

[0048] The chemical composition and mass content of the high-strength, toughness, wear-resistant high manganese steel are as follows: C: 0.9%, Si: 0.5%, Mn: 12.5%, Cr: 0.8%, Zr: 0.07%, P: 0.022%, S: 0.033%, and the balance is iron and unavoidable impurities, [Zr][C]wt%=6.3×10 -6 .

[0049] The preparation method of the high-strength, toughness, wear-resistant high manganese steel comprises the following steps:

[0050] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, the composition of molten steel is adjusted to within the error range of the designed composition, the temperature of the molten steel reaches 1480°C, and then it is discharged from the furnace;

[0051] S2) inoculation treatment: placing an inoculant made of ferro-zirconium alloy inside the ladle, and inoculating the molten steel obtained in step S1 by the ladle-injection method to obtain molten steel to be poured;

[0052] S3) casting: cooling the molten steel obtained in step S2 to 1430° C., pouring through a pouring gate, solidifying and cooling to obtain a casting;

[0053] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent into a heat treatment furnace, heated to 1060° C., kept at this temperature for 6 hours, and then water-cooled to room temperature to obtain the casting.

[0054] Example 3: A high-strength, wear-resistant high-manganese steel

[0055] The chemical composition and mass content of the high-strength, toughness, wear-resistant high manganese steel are as follows: C: 1.0%, Si: 0.7%, Mn: 14.0%, Cr: 1.0%, Zr: 0.09%, P: 0.025%, S: 0.035%, and the balance is iron and unavoidable impurities, [Zr][C]wt%=9×10 -6 .

[0056] The preparation method of the high-strength, toughness, wear-resistant high manganese steel comprises the following steps:

[0057] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, the composition of molten steel is adjusted to within the error range of the designed composition, the temperature of the molten steel reaches 1480°C, and then it is discharged from the furnace;

[0058] S2) inoculation treatment: placing an inoculant made of ferro-zirconium alloy inside the ladle, and inoculating the molten steel obtained in step S1 by the ladle-injection method to obtain molten steel to be poured;

[0059] S3) casting: cooling the molten steel obtained in step S2 to 1430° C., pouring through a pouring gate, solidifying and cooling to obtain a casting;

[0060] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent into a heat treatment furnace, heated to 1070° C., kept at this temperature for 6 hours, and then water-cooled to room temperature to obtain the casting.

[0061] like Figure 1 As shown in the figure, the average grain size of high manganese cast steel is 78.5μm. Zr(C,N) is evenly distributed in the matrix, and its size is mainly concentrated in 2.6-5.8μm.

[0062] Example 4: A high-strength, wear-resistant high-manganese steel

[0063] The chemical composition and mass content of the high-strength, toughness, wear-resistant high manganese steel are as follows: C: 1.1%, Si: 0.8%, Mn: 15.5%, Cr: 1.0%, Zr: 0.12%, P: 0.024%, S: 0.030%, and the balance is iron and unavoidable impurities, [Zr][C]wt%=13.2×10 -6 .

[0064] The preparation method of the high-strength, toughness, wear-resistant high manganese steel comprises the following steps:

[0065] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, the composition of molten steel is adjusted to within the error range of the designed composition, the temperature of the molten steel reaches 1480°C, and then it is discharged from the furnace;

[0066] S2) inoculation treatment: placing an inoculant made of ferro-zirconium alloy inside the ladle, and inoculating the molten steel obtained in step S1 by the ladle-injection method to obtain molten steel to be poured;

[0067] S3) casting: cooling the molten steel obtained in step S2 to 1430° C., pouring through a pouring gate, solidifying and cooling to obtain a casting;

[0068] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent into a heat treatment furnace, heated to 1080° C., kept at this temperature for 5 hours, and then water-cooled to room temperature to obtain the casting.

[0069] Example 5: A high-strength, wear-resistant high-manganese steel

[0070] The chemical composition and mass content of the high-strength, toughness, wear-resistant high manganese steel are as follows: C: 1.3%, Si: 0.8%, Mn: 17%, Cr: 1.2%, Zr: 0.11%, P: 0.022%, S: 0.030%, and the balance is iron and unavoidable impurities, [Zr][C]wt%=14.3×10 -6 .

[0071] The preparation method of the high-strength, toughness, wear-resistant high manganese steel comprises the following steps:

[0072] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, the composition of molten steel is adjusted to within the error range of the designed composition, the temperature of the molten steel reaches 1480°C, and then it is discharged from the furnace;

[0073] S2) inoculation treatment: placing an inoculant made of ferro-zirconium alloy inside the ladle, and inoculating the molten steel obtained in step S1 by the ladle-injection method to obtain molten steel to be poured;

[0074] S3) casting: cooling the molten steel obtained in step S2 to 1430° C., pouring through a pouring gate, solidifying and cooling to obtain a casting;

[0075] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent into a heat treatment furnace, heated to 1100° C., kept at this temperature for 5 hours, and then water-cooled to room temperature to obtain the casting.

[0076] Comparative Example 1: Conventional wear-resistant high manganese steel

[0077] The chemical composition and mass content of the conventional wear-resistant high manganese steel are: C: 1.0%, Si: 0.7%, Mn: 14.0%, Cr: 1.0%, P: 0.025%, S: 0.035%, and the remainder is iron and inevitable impurities.

[0078] The preparation method of the conventional wear-resistant high manganese steel comprises the following steps:

[0079] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, the composition of molten steel is adjusted to within the error range of the designed composition, the temperature of the molten steel reaches 1480°C, and then it is discharged from the furnace;

[0080] S2) inoculation treatment: placing an inoculant made of ferro-zirconium alloy inside the ladle, and inoculating the molten steel obtained in step S1 by the ladle-injection method to obtain molten steel to be poured;

[0081] S3) casting: cooling the molten steel obtained in step S2 to 1430° C., pouring through a pouring gate, solidifying and cooling to obtain a casting;

[0082] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent into a heat treatment furnace, heated to 1070° C., kept at this temperature for 6 hours, and then water-cooled to room temperature to obtain the casting.

[0083] like Figure 2 As shown, the average grain size of Zr-free high manganese cast steel is 124.5μm.

[0084] Comparative Example 2

[0085] The chemical composition and mass content of the high manganese steel are: C: 1.3%, Si: 0.8%, Mn: 17%, Cr: 1.2%, Zr: 0.16%, P: 0.022%, S: 0.028%, and the balance is iron and unavoidable impurities, [Zr][C]wt%=20.8×10 -6 .

[0086] The preparation method of the high manganese steel comprises the following steps:

[0087] S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, the composition of molten steel is adjusted to within the error range of the designed composition, the temperature of the molten steel reaches 1480°C, and then it is discharged from the furnace;

[0088] S2) inoculation treatment: placing an inoculant made of ferro-zirconium alloy inside the ladle, and inoculating the molten steel obtained in step S1 by the ladle-injection method to obtain molten steel to be poured;

[0089] S3) casting: cooling the molten steel obtained in step S2 to 1430° C., pouring through a pouring gate, solidifying and cooling to obtain a casting;

[0090] S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent into a heat treatment furnace, heated to 1100° C., kept at this temperature for 5 hours, and then water-cooled to room temperature to obtain the casting.

[0091] Examples and Comparative Examples Material Performance Tests

[0092] Experimental method: The performance of high manganese steel prepared in Examples 1-5 and Comparative Examples 1 and 2 was tested. Among them, the yield strength detection method refers to GB / T228.1, and the U-notch impact absorption energy detection method refers to GB / T229. The impact abrasive wear test was carried out on an MLD-10 dynamic load abrasive wear testing machine. The wear impact energy is 3.0J, the impact frequency is 100 times per minute, the lower sample is 45# steel, the rotation speed is 100 revolutions per minute, the abrasive tested is quartz sand with a particle size between 60 and 80 meshes, and the flow rate of the abrasive is controlled at about 50kg per hour. Each group of samples needs to be pre-grinded for 30 minutes before the test. During the impact wear process, the weight loss is weighed once with 30 minutes as a wear cycle, and a total of five cycles are carried out, totaling 2.5 hours. The test results are listed in Table 1.

[0093] Table 1 Performance test results

[0094]

[0095] The yield strength, U-notch impact absorption energy and abrasion weight loss in Table 1 are the average values ​​of three values.

[0096] It can be concluded from Table 1 that the yield strength of the high manganese steel prepared by the present invention is 415.2-512.3MPa, and the U-notch impact absorption energy can reach 100.2-122.3J, showing excellent deformation resistance and wear resistance. Under similar components and the same process, the yield strength of Example 3 (containing Zr) is increased by about 20.7% (81.3MPa) compared with Comparative Example 1 (without Zr), and its U-notch impact absorption energy is still as high as 112.6J, which is about 14.1% (14J) higher than Comparative Example 1 (without Zr). The corresponding wear weight loss of Example 3 (containing Zr) is reduced by 19.3% (90.7mg) compared with Comparative Example 1.

[0097] The obvious difference between the present invention and the existing wear-resistant high manganese steel is that it contains an appropriate amount of Zr. By optimizing the ratio of Zr and C elements (3×10 -6 ≤[Zr][C]wt%≤20×10 -6 ), water-toughening heat treatment process, to obtain a complex phase structure with fine grains and micro / nano-sized Zr(C,N) hard phases evenly distributed on the austenite matrix. Zr(C,N) as a heterogeneous phase can promote the nucleation of γ-Fe during solidification, and its high melting point can also inhibit the growth of grains during water-toughening treatment, thereby obtaining fine grains. Grain refinement can simultaneously improve the yield strength and impact toughness of the material. In addition, dispersed Zr(C,N) can inhibit dislocation movement, improve the yield strength of the material, and weaken the micro-cutting behavior of the abrasive. However, a low Zr content or [Zr][C]wt% value makes it difficult to form a sufficient amount of Zr(C,N) phase, resulting in a weak heterogeneous nucleation effect. Excessively high Zr content or [Zr][C]wt% value, as shown in Comparative Example 2 in Table 1, will promote the formation of a larger-sized Zr(C,N) phase, severely split the matrix, and cause the toughness of the material to drop sharply.

[0098] The present invention has been optimized in composition design, combined with appropriate casting process and water-tough heat treatment process, and utilizes grain refinement superimposed on the dispersion strengthening of the precipitated phase. While the yield strength of high manganese steel is significantly improved, the organization still exhibits high toughness, overcoming the contradiction between the existing metal material strength (yield strength) toughness matching and production cost under medium and high stress impact abrasive wear conditions. Zr-containing high manganese steel with both high yield strength and good impact toughness exhibits better wear resistance than traditional Zr-free high manganese steel in medium and high impact abrasive wear tests, and is particularly suitable for manufacturing wear-resistant parts under medium and high stress impact abrasive wear conditions such as medium and large ball mill liners, crushing walls of cone crushers and rolling mill walls.

[0099] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A high-strength, tough, wear-resistant high manganese steel, characterized in that: Calculated by mass percentage, the chemical composition of the high-strength, toughness, wear-resistant high manganese steel is: C: 0.8-1.4%, Si: 0.3-0.9%, Mn: 10-17%, Cr: 0.5-1.5%, Zr: 0.03-0.18%, P≤0.032%, S≤0.040%, and the remainder is Fe and unavoidable impurities.

2. The high-strength, toughness, wear-resistant high manganese steel as claimed in claim 1, characterized in that: The chemical composition of the high-strength, toughness and wear-resistant high manganese steel is as follows: C: 0.8-1.1%, Si: 0.4-0.8%, Mn: 10.5-15.5%, Cr: 0.5-1.0%, Zr: 0.05-0.12%, P≤0.025%, S≤0.035%, and the remainder is iron and inevitable impurities.

3. The high-strength, toughness, wear-resistant high manganese steel as claimed in claim 1, characterized in that: The chemical composition of the high-strength, tough, wear-resistant high manganese steel contains Zr and C that meet the following conditions: 3×10 -6 ≤[Zr][C]wt%≤16×10 -6 .

4. The high-strength, toughness, wear-resistant high manganese steel as claimed in claim 3, characterized in that: The chemical composition of the high-strength, tough, wear-resistant high manganese steel contains Zr and C that meet the following conditions: 4×10 -6 ≤[Zr][C]wt%≤14.3×10 -6 .

5. The method for preparing the high-strength, toughness, wear-resistant high manganese steel according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1) Smelting: Pig iron, scrap steel, pure iron metal and ferroalloy are added into an electric furnace for smelting, and the composition of the molten steel is adjusted to within the error range of the designed composition, and then the molten steel is taken out of the furnace; S2) inoculation treatment: placing an inoculant composed of a zirconium-iron alloy inside the ladle, and inoculating the molten steel obtained in step S1 by a ladle-injection method to obtain molten steel to be poured; S3) casting: pouring the molten steel obtained in step S2 through a pouring gate, solidifying and cooling to obtain a casting; S4) Water toughening treatment: The casting obtained in step S3 is subjected to sand removal treatment, and then sent to a heat treatment furnace for heating, heat preservation, and water cooling to room temperature to obtain the casting.

6. The high-strength, toughness, wear-resistant high manganese steel as claimed in claim 5, characterized in that: The temperature of the molten steel out of the furnace in step S1 is 1480°C.

7. The method for preparing high-strength, toughness, wear-resistant high manganese steel according to claim 5, characterized in that: The preparation method of the inoculant in step S2 is as follows: the ferro-zirconium alloy is crushed into particles with a diameter of ≤3 mm by mechanical grinding and dried, and then wrapped with iron foil to obtain the inoculant.

8. The method for preparing high-strength, toughness, wear-resistant high manganese steel as claimed in claim 5, characterized in that: The pouring temperature of the molten steel in step S3 is 1430°C.

9. The method for preparing high-strength, toughness, wear-resistant high manganese steel as claimed in claim 5, characterized in that: The solution temperature of the water toughening treatment in step S4 is 1050°C-1100°C, and the holding time is 4-8h.

10. Use of the high-strength, toughness, wear-resistant high manganese steel according to any one of claims 1 to 4 in the manufacture of wear-resistant parts.

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