A method for preparing cast austenitic high manganese wear-resistant steel and its products and their application

Abstract

The invention relates to a cast austenite high manganese wear-resistant steel. The alloy elements of the steel are as follows by mass percentage: C: 0.7-1.3%, Si: 0.3-0.7%, Mn: 7.0-20.0%, Al: 0.03-0.4%, Cr: 0.2-1.0%, Mo: 0.1-0.6%, Ni: 2.0-7.0%, V: 0.05-0.6%, N: 0.01-0.04%, P: ≤0.04%, S: ≤0.02%, and the remainder is iron and unavoidable impurities. The present invention reasonably proportions C, Mn, Ni and Cr elements and alloys them with Mo, V, Nb, N and Re, so that the steel can obtain reliable cast austenite. Because the alloyed material crystal package is densely distributed with fine nucleation carbides such as Mo, V, Nb, N and Re, the grains are refined, and the precipitation of grain boundary carbides can be significantly reduced, thereby improving the mechanical properties. In addition, due to the presence of grain refinement and fine carbide hard points, the stacking fault energy in the process of work hardening can be effectively reduced, thereby improving the work hardening ability and increasing the wear resistance of the product.

Description

Technical Field

[0001] The invention relates to the technical field of metal material processing, and in particular to a preparation method and application of cast austenitic high-manganese wear-resistant steel and products thereof. Background Art

[0002] High manganese steel is a special wear-resistant steel. In 1883, the British Hadfield (R0.A0.Hadfield) first obtained a patent for high manganese steel. Representative steel grades include ZG120Mn13 (C: 1.05-1.35%, Si: 0.3-0.9%, Mn: 11-14%, P: ≤0.06%; S: ≤0.04%, allowing the addition of a small amount of V, Ti, Nb, B and RE elements). High manganese steel has a history of more than 100 years since its advent. This type of steel with high carbon and manganese content has a sharp increase in surface hardness and strength due to the deformation of the shallow surface under impact load, which induces twin strengthening and dislocation entanglement. Since this work hardening phenomenon only exists on the surface and the matrix below the surface is still austenite, it is used in heavy-load equipment such as crushers. It has the characteristics of high hardness and wear resistance of martensitic wear-resistant steel, as well as excellent toughness and plasticity. At present, it is still the most consumed type of wear-resistant steel in areas such as mining, crushing and transportation.

[0003] With the development of materials science, people's understanding of the current high manganese steel is becoming increasingly clear. In the actual processing process, high manganese steel must be heated to a high temperature of more than 1050℃ and then water-toughened to make the matrix austenitized before it can meet the use requirements. Water-toughening is a solution treatment process. Since the cast structure of high manganese steel is composed of austenite, carbide and a small amount of pearlite. The carbides precipitated along the austenite grain boundary reduce the toughness of the steel. In order to eliminate the carbides, the steel is heated to the austenite zone temperature (1050-1100℃) and kept warm for a period of time (1h for every 25mm wall thickness), so that the carbides in the cast structure are basically dissolved into the austenite, and then quickly water-cooled (hence it is called water-toughening treatment), so as to obtain a single supercooled austenite structure. For example, the conveyor plates on the ore conveyor in large mines are thin and long workpieces, the longest of which reaches about 3m. Since the conveyor plates are used for chain link string assembly, the dimensional accuracy requirements for each conveyor plate are relatively high.

[0004] However, thin and long high-manganese steel workpieces such as conveyor plates have many shortcomings in actual production: (1) The irregular deformation during water toughening is difficult to control, and it is difficult to reshape after distortion. High-manganese wear-resistant steel conveyor plates produced by conventional processes, after water toughening and shot blasting, often result in unqualified product flatness and deformation in both the longitudinal direction and the plane. Repeated shaping is required to meet the requirements of the drawings. Some products are even severely twisted and deformed and cannot be straightened and have to be scrapped. (2) It is difficult to use it to manufacture high-manganese steel and ZTA ceramic composite parts, such as high-manganese steel and ZTA ceramic composite plate hammers. Plate hammers are one of the important components of impact crushers when processing materials. High manganese steel or ultra-high manganese steel is often used as the base material of large wear-resistant parts, and hard ZTA ceramic particles are compositely inlaid in the working part. Since high manganese steel produced by conventional water-toughening heat treatment process needs to be treated by water at 1050-1100℃, the expansion and contraction of the high manganese steel matrix embedded with ZTA ceramics are hindered during heat treatment. The ZTA ceramics are broken when subjected to the rapid temperature change during water-toughening treatment, making the high manganese steel composite ZTA ceramic process difficult to implement. (3) The wear resistance of high manganese steel is still poor in many occasions. From a comprehensive analysis of the two aspects of production difficulty and material properties, water-toughened austenitic high manganese steel belongs to a type of stable austenitic material. Its composition design range is located in the austenite region of the Fe-C-Mn organization diagram. Under impact abrasive wear conditions, the strengthening mechanism of austenite is: A→dislocation, twin→ε-M→α′-M. Since most impact conditions are <3.0J / cm 2 The impact load belongs to the category of medium and low impact value, and its impact energy cannot fully meet the physical equivalent of α′-M phase transformation. Therefore, the wear resistance of products such as conveyor plates used for ore material transportation is not ideal. For example, non-strong impact parts such as ball mill liners and crushing surface guards made of traditional austenitic high manganese steel have a short service life and consume a lot of resources.

[0005] In summary, it is necessary to propose an improvement method for the existing technology. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for preparing cast austenitic high manganese wear-resistant steel and its products. The cast austenitic high manganese wear-resistant steel has mechanical properties (tensile strength and impact strength) equivalent to those of austenitic high manganese steel and wear resistance better than that of austenitic high manganese steel, and no water toughening treatment is required during the processing into products, which not only saves heat treatment energy consumption and material oxidation and burning, but also greatly reduces the workload of the shaping process, shortens the product manufacturing cycle, avoids the difficult-to-control distortion caused by water toughening treatment, and further improves the technical problem of low product qualification rate caused by deformation.

[0008] (II) Technical solution

[0009] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0010] In the first aspect, the present invention provides a cast austenitic high manganese wear-resistant steel, whose alloy elements are calculated by mass percentage: C: 0.7-1.3%, Si: 0.3-0.7%, Mn: 7.0-20.0%, Al: 0.03-0.4%, Cr: 0.2-1.0%, Mo: 0.1-0.6%, Ni: 2.0-7.0%, V: 0.05-0.6%, N: 0.01-0.04%; P: ≤0.04%; S: ≤0.02%, and the balance is iron and unavoidable impurities.

[0011] Preferably, the C content is: 1.3% ≥ C ≥ 0.8%, more preferably 1.2% ≥ C ≥ 0.9%.

[0012] Preferably, the Si content is: 0.7%≥Si≥0.5%, more preferably 0.65%≥Si≥0.55%.

[0013] Preferably, the Mn content is: 17.0%≥Mn≥9%, more preferably 15%≥Mn≥10%.

[0014] Preferably, the Ni content is: 5%≥Ni≥3%, more preferably 4.2%≥Ni≥3.20%.

[0015] Preferably, the Cr content is: 0.9%≥Cr≥0.3%, more preferably 0.75%≥Cr≥0.35%.

[0016] Preferably, the Mo content is: 0.50% ≥ Mo ≥ 0.20%, more preferably 0.40% ≥ Mo ≥ 0.30%.

[0017] Preferably, the V content is: 0.40%≥V≥0.10%, more preferably 0.35%≥V≥0.15%.

[0018] Preferably, the N content is: 0.03% ≥ N ≥ 0.02%, more preferably 0.025% ≥ N ≥ 0.020%.

[0019] Preferably, P: ≤0.035%; S: ≤0.015%; if technically achievable, the lower the content of P and S, the better.

[0020] Preferably, the Al content is: 0.20%≥Al≥0.05%, more preferably 0.10%≥Al≥0.05%.

[0021] According to a preferred embodiment of the present invention, the wear-resistant steel further contains 0.01-0.15% Nb and / or 0.03-0.3% Re. Under the premise of meeting the use requirements of specific occasions, the wear-resistant steel alloy elements may not include Nb or Re elements to reduce product costs; for use occasions with higher product performance requirements, the mechanical properties and wear resistance of the product can be further improved by adding Nb or Re elements.

[0022] Preferably, the Nb content is: 0.15%≥Nb≥0.05%, more preferably 0.10%≥Nb≥0.06%. Preferably, the Re content is: 0.25%≥Re≥0.05%, more preferably 0.10%≥Re≥0.05%.

[0023] Among them, Al and Re are deoxidizing and degassing elements. In actual production, ReSiCa alloy and aluminum can be used to jointly deoxidize wear-resistant steel.

[0024] In the cast austenitic high manganese wear-resistant steel of the present invention, the wear-resistant steel obtains reliable cast austenite by reasonably proportioning the elements C, Si, Mn, Ni and Cr, and alloying the steel with Mo, V, Nb, N and Re, so that the wear-resistant steel is dispersed with high-melting-point fine nucleation carbides such as Mo, V, Nb, N and Re, which provide polycrystalline nucleus crystallization conditions for the early crystallization of molten steel, thereby refining the grains and significantly reducing the generation of grain boundary carbides, thereby improving mechanical properties such as tensile strength and impact value; and due to the presence of grain refinement and fine carbide hard points, the stacking fault energy in the process of work hardening can be effectively reduced, thereby improving the work hardening ability and increasing the wear resistance of the product.

[0025] Among them, Ni is a strong austenite stabilizing element. By increasing the content of Ni, it is beneficial to stabilize the mechanical properties of wear-resistant steel (improve tensile strength and impact value, etc.). Cr, Mo, V, Nb, and N are alloying elements (used to generate carbides, nitrides, etc.) and are used to improve the wear resistance of wear-resistant steel. Among them, Re and Al are deoxidizing and degassing agents.

[0026] Among them, when the content of Cr, Mo, Ni, V, Nb, Re, etc. is too high, the product cost will increase significantly, and the excessive element content will reduce the mechanical properties of the wear-resistant steel. Similarly, when the content of Cr, Mo, Ni, V, etc. is too low, the mechanical properties of the wear-resistant steel product cannot meet expectations. Therefore, the present invention limits their content to the aforementioned range.

[0027] In a second aspect, the present invention provides a method for preparing a cast austenitic high manganese wear-resistant steel product, which comprises: adding raw materials according to the alloy element composition, smelting to 1500-1600°C and taking out of the furnace, blowing argon in a bag for 3-8 minutes, pouring into a product mold at 1400-1500°C, demolding to obtain a cast blank, and obtaining a cast austenitic high manganese wear-resistant steel product after cleaning, grinding or cleaning, grinding and combined machining of the blank.

[0028] Preferably, the cleaning and grinding include cutting and pouring, riser cleaning and shot blasting cleaning.

[0029] Preferably, the machining includes machining methods such as turning, milling, planing, drilling, and water jet.

[0030] Preferably, the melting temperature is 1520-1560°C and the pouring temperature is 1420-1460°C.

[0031] Preferably, the cast austenitic high manganese wear-resistant steel product is a thin, long, wear-resistant workpiece.

[0032] Preferably, the cast austenitic high manganese wear-resistant steel products are wear-resistant workpieces such as conveyor plates on ore conveyors in large mines, crusher composite ceramic plate hammers, crusher hammer heads, crusher guard plates, ball mill liners, Raymond mill grinding rollers, grinding rings, etc.

[0033] In a third aspect, the present invention provides an application of the cast austenitic high manganese wear-resistant steel in the preparation of thin and long wear-resistant workpieces.

[0034] In a fourth aspect, the cast austenitic high manganese wear-resistant steel provided by the present invention is used in the preparation of conveyor plates on ore conveyors, crusher composite ceramic plate hammers, crusher hammer heads, crusher guard plates, ball mill liners, and grinding rollers or grinding rings of Raymond mills.

[0035] (III) Beneficial effects

[0036] The invention provides a cast austenitic high manganese wear-resistant steel having mechanical properties equivalent to those of austenitic high manganese steel and wear resistance superior to that of austenitic high manganese steel. The steel is mainly prepared by reasonably proportioning the elements C, Mn, Ni and Cr and alloying the steel with Mo, V, N, Nb and Re (such as containing Nb and Re). The alloyed material has fine nucleation carbides such as Mo, V, Nb, N and Re, which can refine the grains and significantly reduce the precipitation of grain boundary carbides, thereby improving the mechanical properties. The refined grains and the presence of fine carbide hard points can reduce the stacking fault energy in the process of work hardening, thereby improving the work hardening ability and increasing the wear resistance of the cast austenitic high manganese wear-resistant steel product.

[0037] The cast austenitic high manganese wear-resistant steel of the present invention can be classified as a metastable austenitic new material. The crystal package of this material is densely distributed with high hardness points such as carbides, nitrides and oxides. These high hardness points themselves are wear-resistant phases, and these high hardness points hinder the dislocation, thereby reducing the phase change impact energy and providing favorable conditions for work hardening.

[0038] Compared with the existing austenitic high manganese steel, the cast austenitic high manganese wear-resistant steel provided by the present invention has the following technical advantages:

[0039] First, no water-tough heat treatment is required during the product processing process, which not only reduces metal burning, deformation and heating energy consumption during the water-tough heat treatment process, but also can avoid the influence of water-tough heat treatment deformation on thin and long structural products such as conveyor plates, thereby improving the production accuracy and assembly accuracy of the products; since there is no problem of water-tough heat treatment deformation, the shaping workload can be greatly reduced, the qualified rate of thin and long structural products can be improved, the production cycle can be shortened and the production efficiency can be improved; the casting production cycle is reduced by at least 5 days, and the product qualified rate is increased from about 93% to more than 98%. In addition, when using the cast austenitic high manganese wear-resistant steel of the present invention to produce ZTA ceramic composite products (such as plate hammers, etc.), since no water-tough heat treatment is required, the problems of product cracking and embedded ZTA ceramic fragmentation can be prevented, thereby overcoming the problem that the existing high manganese steel composite ceramic ZTA ceramic process is difficult to implement.

[0040] Second, it has good safety and wear resistance, and its wear resistance is better than that of ordinary high manganese steel products. According to the test, the cast Brinell hardness of the cast austenitic high manganese wear-resistant steel of the present invention is ≥220HB, tensile strength: ≥713Mpa, elongation: ≥24%, and impact strength Aku: ≥91.3J; this hardness is equivalent to that of the conventional water-toughened Mn18Cr2 high manganese steel; and its Brinell hardness, tensile strength and impact strength far exceed the performance parameters of the wear-resistant workpiece (performance indicators of the wear-resistant workpiece: hardness: HB140-240, tensile strength ≥650Mpa, elongation ≥20%, impact strength AKu ≥90J)

[0041] A comparative wear test was conducted on a MLD-10 dynamic abrasive wear tester with conventional water-toughened Mn18Cr2 high manganese steel (relative wear resistance = impact wear time / weight difference of the sample before and after the test). The test impact energy was 1.0 Jcm 2 The impact times are 100 times / min, the abrasive material is 10-12 mesh crushed quartz sand, the wear test time is 30 minutes, and the relative wear resistance is more than 1.85 times that of the control group. The cast austenite high manganese wear-resistant steel of the present invention is used to produce the ball mill liner for more than 18 months, which is more than half a year longer than the original Mn18Cr2 product, and the service life is more than 1.5 times that of the conventional Mn18Cr2.

[0042] Third, it is more suitable for producing vulnerable parts of mining equipment. Such as conveyor plates on ore conveyors in large mines, composite ceramic plate hammers of crushers, hammer heads of crushers, guard plates of crushers, liner plates of ball mills, grinding rollers and rings of Raymond mills, etc. Since the replacement rate of vulnerable parts of such equipment is very high, the consumption of accessories is large, and the conventional process production is difficult. The cast austenitic high manganese wear-resistant steel of the present invention has the advantages of better wear resistance, good safety, short production cycle, fewer production processes, etc. Therefore, except for a slight increase in material costs, the technical solution of the present invention can create very considerable social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a crystal phase comparison diagram of the cast austenitic high manganese wear-resistant steel of the present invention under 200 times and 500 times electron microscope viewing field and Mn18Cr2 high manganese steel produced by conventional water toughening heat treatment. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0045] Example 1

[0046] This embodiment provides a cast austenitic high manganese wear-resistant steel with mechanical properties comparable to austenitic high manganese steel and wear resistance superior to austenitic high manganese steel, and its alloy elements are calculated by mass percentage: C: 1.15%, Si: 0.52%, Mn: 15.3%, Al: 0.05%, Cr: 0.33%, Mo: 0.17%, Ni: 2.9%, V: 0.11%, N: 0.02%, Re: 0.04%; P: ≤ 0.04%; S: ≤ 0.02%, and the remainder is iron and unavoidable impurities. The steel is melted to 1550°C in a medium frequency furnace according to the above ingredients, argon is blown in the ladle for 5 minutes, and the cast blank is cast at 1450°C, which is tested after cutting, pouring, rising cleaning, and shot blasting.

[0047] Example 2

[0048] This embodiment provides a cast austenitic high manganese wear-resistant steel with mechanical properties comparable to austenitic high manganese steel and wear resistance superior to austenitic high manganese steel, and its alloy elements are calculated by mass percentage: C: 0.99%, Si: 0.34%, Mn: 17.0%, Al: 0.35%, Cr: 0.72%, Mo: 0.45%, Ni: 6.4%, V: 0.35%, Nb: 0.12%, N: 0.037%; P: ≤0.04%; S: ≤0.02%, the remainder is iron and unavoidable impurities. The steel is melted to 1580℃ in a medium frequency furnace according to the above ingredients, argon is blown in the ladle for 5 minutes, and the cast blank is cast at 1430℃, which is tested after cutting, pouring, riser cleaning, and shot blasting.

[0049] The mechanical properties of the cast austenitic high manganese wear-resistant steel of test example 1 and example 2 are as follows: the cast Brinell hardness is 220-240HB, the tensile strength is ≥713Mpa, the elongation is ≥24%, and the impact strength Aku is ≥91.3J (the above items are all measured values ​​of the sample). This hardness is equivalent to the Mn18Cr2 high manganese steel treated with conventional water toughening; and the hardness value, tensile strength and impact strength far exceed the index values ​​of the performance parameters of wear-resistant workpieces such as "conveyor plates on ore conveyors in large mines, composite ceramic plate hammers of crushers, hammer heads of crushers, guard plates of crushers, liner plates of ball mills, and grinding rollers and rings of Raymond mills" (performance indicators of wear-resistant workpieces: hardness: HB140-240, tensile strength ≥650Mpa, elongation ≥20%, and impact strength AKu ≥90J).

[0050] Comparative Example 1

[0051] Comparative Example 1 is a Mn18Cr2 high manganese steel subjected to water toughening heat treatment, and its alloy composition is: C: 1.27%, Si: 0.53%, Mn: 18.1%, Al: 0.039%, Cr: 1.9%, Ni: 0.021%, Cu: 0.028%, Mo: 0.133%, P: 0.039%, S: 0.01%; the remainder is iron and unavoidable impurities. The steel was melted and poured according to the above composition, and then subjected to water toughening heat treatment and shot blasting cleaning, and then tested.

[0052] Under the same test conditions, the crystal phase of the cast austenitic high manganese wear-resistant steel of Example 1 and Example 2 and the Mn18Cr2 high manganese steel treated with conventional water toughening in Comparative Example 1 were compared. Figure 1 . As shown in the figure, under the 200x field of view, it can be seen that the cast austenitic high manganese wear-resistant steel of the present invention is densely covered with fine carbides, nitrides and oxides and other high-hardness wear-resistant particles, and under the 500x field of view, the austenite grain boundaries are clear and there are few inclusions at the grain boundaries. Compared with Comparative Example 1, the metallographic diagram of the cast austenitic high manganese wear-resistant steel of the present invention shows that the austenite crystal package is fine, the crystals are densely covered with carbides, nitrides and oxides and other high-hardness wear-resistant particles (according to GB / T 13925-2010 non-metallic inclusion rating 3A or so, and no inclusions larger than 5mm are seen), and the grain boundaries are relatively clean. The grains of the cast austenitic high manganese wear-resistant steel are about half smaller than the grains of the conventional water-toughened high manganese steel Mn18Cr2 qualified products.

[0053] A comparative wear test was conducted on a MLD-10 dynamic abrasive wear tester with conventional water-toughened Mn18Cr2 (relative wear resistance = impact wear time / weight difference of the sample before and after the test). The test impact energy was 1.0 Jcm 2, the impact frequency is 100 times / min, the abrasive material is 10-12 mesh crushed quartz sand, and the wear test time is 30 minutes. The relative wear resistance of Examples 1 and 2 is 1.85 and 2.11 times that of the control group respectively.

[0054] Example 3

[0055] The present embodiment is an application of a cast austenitic high manganese wear-resistant steel in the preparation of a conveyor plate (2470 mm long plate) of a mineral conveyor, and the alloy elements thereof are calculated by mass percentage as follows: C: 0.90%, Si: 0.6%, Mn: 12.8%, Al: 0.045%, Cr: 0.26%, Mo: 0.20%, Ni: 3.27%, V: 0.15%, Nb: 0.10%, N: 0.025%, Re: 0.04%; P: ≤0.04%; S: ≤0.02%, and the remainder is iron and unavoidable impurities. The materials are melted to 1550℃ in a medium frequency furnace according to the above ingredients, and then taken out of the furnace. Argon is blown in the bag for 5 minutes, and poured into the forming mold of the conveyor plate of the ore conveyor at 1460℃. After demoulding, the cast blank of the conveyor plate is obtained. After cutting off the pouring and riser cleaning and shot blasting cleaning, the side of the conveyor plate is straight in the length direction, and only slight shaping is required in the plane direction, which fully meets the assembly requirements.

[0056] On the contrary, if Mn18Cr2 high manganese steel conveyor plate is produced by water toughening heat treatment as a control, the Mn18Cr2 high manganese steel conveyor plate has plane deformation, and its side surface is curved in the length direction (concave arc deformation on one side and convex arc deformation on the other side). The side deformation of the 2470mm long plate exceeds 60mm, and repeated shaping is required to meet the drawing and assembly accuracy requirements.

[0057] Example 4

[0058] This embodiment is an application of a cast austenitic high manganese wear-resistant steel in the preparation and production of a crusher composite ceramic plate hammer product, wherein the alloy elements are calculated by mass percentage as follows: C: 1.25%, Si: 0.62%, Mn: 17.3%, Al: 0.042%, Cr: 0.85%, Mo: 0.25%, Ni: 4.55%, V: 0.16%, N: 0.020%, Re: 0.042%; P: ≤0.04%; S: ≤0.02%, and the remainder is iron and unavoidable impurities. The steel is melted to 1560°C in a medium frequency furnace according to the above composition, argon is blown in the bag for 3 minutes, and poured into a plate hammer forming mold pre-installed with ceramic blocks at 1460°C, demolded, and a high manganese wear-resistant steel-ceramic composite plate hammer cast blank is obtained. After plane processing, a cast austenitic high manganese wear-resistant steel-ceramic composite plate hammer is obtained. Among them, the composition of the ceramic ZTA ceramic block is 70% Al2O3 + 30% ZrO2, the ceramic particle size is 12 mesh, and the number of inlays is 16 groups per side. The product qualification rate of this process reaches 100%.

[0059] Conventional water-toughening heat treatment process is used to produce high manganese steel-ceramic composite plate hammers. The water-toughening heat treatment requires the steel to be kept at 1080℃ for several hours and then immersed in water for water-toughening treatment. In most cases, the ceramic will break due to the factors such as difficulty in withstanding the severe thermal expansion and contraction and the rapid temperature change during the water-toughening treatment. In addition, the high manganese steel body will also crack due to the uneven stress caused by the addition of ceramic blocks during the heat treatment heating process, making the high manganese steel-ceramic composite process difficult to achieve.

[0060] On the contrary, when the cast austenite high manganese wear-resistant steel of the present invention is used to produce the composite ceramic plate hammer product of the crusher, since the water toughening heat treatment process is not required, the wear-resistant steel composite ceramic process is very easy to implement, and there is no stress uneven cracking. Under the premise that there are no problems with other process conditions, the product qualification rate can reach 100%. In addition, the service life of the wear-resistant steel-ceramic composite plate hammer produced by the cast austenite high manganese wear-resistant steel of the present invention is more than 3 times that of Mn3Cr2.

[0061] Example 5

[0062] The present embodiment is an application of a cast austenitic high manganese wear-resistant steel in the preparation and production of a 2.1m ball mill liner, and the alloy elements thereof are calculated by mass percentage as follows: C: 1.15%, Si: 0.65%, Mn: 13.7%, Al: 0.053%, Cr: 0.65%, Mo: 0.35%, Ni: 3.2%, V: 0.18%, N: 0.021%, Re: 0.035%; P: ≤0.04%; S: ≤0.02%, and the remainder is iron and unavoidable impurities.

[0063] The intermediate frequency furnace is used to melt the materials according to the above ingredients to 1520℃, and then the materials are poured at 1430℃ and demoulded to obtain the cast blank of the ball mill liner. After cutting, pouring, riser cleaning, shot blasting and other surface processing, the ball mill liner is obtained. The product size is more than 99.2% consistent with the design drawing. After being assembled in the ball mill, the service life reaches more than 1.5 years, which is more than half a year longer than the service life of the original Mn13Cr2 product, and the service life is 1.5 times that of the original Mn13Cr2 product.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cast austenitic high manganese wear-resistant steel without water toughening treatment, characterized in that: The alloying elements are calculated by mass percentage as follows: C: 0.7-1.3%, Si: 0.3-0.7%, Mn: 7.0-20.0%, Al: 0.03-0.4%, Cr: 0.2-1.0%, Mo: 0.1-0.6%, Ni: 3.0-7.0%, V: 0.05-0.6%, N: 0.01-0.04%, P: ≤0.04%, S: ≤0.02%, of which the Ni content does not include 3.0%; The as-cast austenitic high manganese wear-resistant steel further contains 0.01-0.15% Nb and / or 0.03-0.3% RE; and the balance is iron and unavoidable impurities; The as-cast austenitic high manganese wear-resistant steel has an as-cast Brinell hardness of ≥220HB, a tensile strength of ≥713Mpa, an elongation of ≥24%, and an impact strength Aku of ≥91.3J.

2. The as-cast austenitic high manganese wear-resistant steel without water toughening treatment according to claim 1, characterized in that: C content: 1.3%≥C≥0.8%.

3. The as-cast austenitic high manganese wear-resistant steel without water toughening treatment according to claim 1, characterized in that: Si content is: 0.7%≥Si≥0.5%.

4. The as-cast austenitic high manganese wear-resistant steel without water toughening treatment according to claim 1, characterized in that: The Mn content is: 17.0%≥Mn≥9%; the Ni content is: 5%≥Ni>3%; the Cr content is: 0.9%≥Cr≥0.3%; the Mo content is: 0.5%≥Mo≥0.20%.

5. The as-cast austenitic high manganese wear-resistant steel without water toughening treatment according to claim 1, characterized in that: V content is: 0.3%≥V≥0.10%; N content is: 0.03%≥N≥0.02%; Al content is: 0.20%≥Al≥0.05%.

6. A method for preparing a cast austenitic high manganese wear-resistant steel product without water toughening treatment, characterized in that: include: Raw materials are added with alloying elements of the cast austenitic high manganese wear-resistant steel without water toughening treatment as described in any one of claims 1 to 5, smelted to 1500-1600° C., blown with argon in a bag for 3-8 minutes, poured into a product mold at 1400-1500° C., demolded to obtain a cast blank, and the blank is cleaned, polished, or cleaned, polished and machined to obtain a cast austenitic high manganese wear-resistant steel product.

7. The preparation method according to claim 6, characterized in that: The as-cast blank is subjected to cutting, riser cleaning and shot blasting cleaning; the melting temperature is 1520-1560°C, and the pouring temperature is 1420-1460°C; the machining includes at least one of turning, milling, planing, drilling and water jet machining methods.

8. Use of the as-cast austenitic high manganese wear-resistant steel without water toughening treatment according to any one of claims 1 to 5 in the preparation of thin and long wear-resistant workpieces.

9. Use of the as-cast austenitic high manganese wear-resistant steel without water toughening treatment according to any one of claims 1 to 5 in the preparation of conveyor plates on ore conveyors, composite ceramic plate hammers for crushers, hammer heads for crushers, guard plates for crushers, liner plates for ball mills, grinding rollers for Raymond mills or grinding rings for Raymond mills.

Images