CN117758135A - A kind of wear-resistant steel ball and its production process - Google Patents

Abstract

The application relates to the technical field of wear-resistant materials, and particularly discloses a wear-resistant steel ball and a production process thereof. Wherein, the wear-resistant steel ball comprises the following chemical components in percentage by weight: 3.0 to 3.2 percent of C, 11 to 26 percent of Cr, 0.3 to 1.2 percent of Si, 1.2 to 2.6 percent of Mn, 0 to 1.5 percent of Ni and less than or equal to 0.1 percent of PS is less than or equal to 0.1%, cu is 0-2.0%, and the balance is iron and unavoidable impurities. The method adjusts the content of each element in the raw material of the wear-resistant steel ball and regulates the production process so that the highest surface hardness, core hardness and impact toughness of the obtained steel ball are respectively 62.7HRC, 60.8HRC and 4.8J/cm ² The fatigue life is more than 18000 times, and the alloy has higher hardness, impact toughness and fatigue life.

Description

A kind of wear-resistant steel ball and its production process

Technical field

The present application relates to the technical field of wear-resistant materials, and more specifically, it relates to a wear-resistant steel ball and its production process.

Background technique

Wear-resistant steel balls are widely used in metallurgy, mineral processing, coal, cement, chemical and other industries. The global annual consumption of grinding balls is about 5 to 6 million tons, and the demand will gradually increase.

The cast grinding balls formed by the casting process are mainly produced by controlling the content and type of alloy elements in the casting material and the forming mold and other conditions to prepare wear-resistant steel balls with different properties and sizes. Chromium cast iron is the most common grinding ball material. According to the chromium content, chromium cast iron can be divided into low chromium, medium chromium and high chromium cast iron. The chromium content of low chromium cast iron is between 0.5-2.5%, and the chromium content of medium chromium cast iron is between 3.0-7.0%. , the chromium content of high chromium cast iron is ≥10.0%. The wear resistance of low and medium chromium cast iron grinding balls is several times that of low carbon steel balls, but the breakage rate is higher. High-chromium cast iron contains a large amount of high-hardness primary and eutectic carbides, has a low breakage rate, and has good corrosion resistance. However, its lack of toughness limits its application scope in the industrial field.

In the related technology, precious metal elements such as yttrium are mixed into the steel ball composition, but this will increase the cost and make it difficult to meet actual needs.

Contents of the invention

In order to overcome the above defects and improve the impact toughness of the wear-resistant steel ball, this application provides a wear-resistant steel ball and its production process.

In the first aspect, this application provides a wear-resistant steel ball, which adopts the following technical solution:

A kind of wear-resistant steel ball, the chemical composition weight percentage of the steel ball is: C 3.0-3.2%, Cr 11-26%, Si0.3-1.2%, Mn 1.2-2.6%, Ni 0-1.5%, P≤0.1 %, S≤0.1%, Cu 0-2.0%, the rest is iron and inevitable impurities.

The chemical composition weight percentage of the wear-resistant steel ball in this application is: C 3.0-3.2%, Cr 11-26%, Si 0.3-1.2%, Mn 1.2-2.6%, Ni 0-1.5%, P≤0.1%, S≤ 0.1%, Cu 0-2.0%, the rest is iron and inevitable impurities, any value within the respective ranges can be selected, and the impact toughness of the wear-resistant steel ball can be improved.

Each chemical element in the wear-resistant steel ball of this application plays the following roles:

Carbon element (C): Carbon is the core and most basic chemical element in high chromium cast iron grinding balls. Carbon elements combine with iron elements to form cementite, which exists in the matrix as a component of cementite or ledeburite that precipitates first and becomes a wear-resistant component in the matrix. The carbon element is solidly dissolved in the matrix in the form of interstitial solid solution, improving the hardness and impact resistance toughness of the matrix itself.

Chromium (Cr): Chromium is the core and most basic chemical element in high-chromium cast iron grinding balls. Chromium helps increase the hardness, toughness and hardenability of cast iron. During eutectic solidification, most of the chromium in the alloy is consumed in carbides, resulting in a higher chromium concentration in carbides than in austenite. In white cast iron, as the chromium content increases, the eutectic temperature gradually increases. In addition, the chromium content also affects the size and shape of the eutectic carbides. Increasing the chromium content prevents the formation of graphite and also helps to increase the number of carbides. In technology, it is common to adjust the carbon content to change the amount of carbides. In actual production, chromium is generally used in a reasonable combination with carbon to achieve the purpose of improving the hardness and toughness of the grinding ball.

Carbon and chromium elements. Carbon is the core and most basic chemical element in high-chromium cast iron grinding balls. The number of carbides can be adjusted by changing the C content. A higher C content will form more carbides and even primary carbides. , which will increase the wear resistance and reduce the toughness. In order to improve the hardness, wear resistance and impact toughness to the greatest extent, a certain amount of chromium must be added for coordination. The carbide type and Cr/C in the high chromium cast iron grinding ball are within the appropriate ratio, which will cause the transformation of M ₃ C carbide (840-1100HV) to M ₇ C carbide (1300-1800HV). At this time, the high chromium The higher the hardness and toughness of cast iron grinding balls. However, the increase of M ₃ C must abide by certain principles, that is, the carbon content must be kept within a certain range. If the carbon content is too low, carbides will decrease and the wear resistance will also become worse. Increasing the carbon content will Improve the hardness and wear resistance of high chromium cast iron grinding balls, but when the carbon content is higher than a certain value, the material's resistance to hot cracking and spalling will be reduced, thereby reducing its wear resistance. By changing the relative content of M ₃ C, the required carbide type and matrix structure can be obtained.

Silicon element (Si): Silicon is a non-carbide-forming element and is mainly soluble in the matrix. Silicon can affect the morphology of carbides, making them isolated, equiaxed, and refined. When the silicon content in cast iron is too high, pearlite is likely to appear, which reduces the initial properties and is prone to peeling during wear. In addition, the addition of silicon is beneficial to deoxidation and increasing the fluidity of molten iron during smelting. Silicon element affects the structure of high chromium cast iron grinding balls in many aspects. During the eutectic reaction during solidification, the increase in silicon content will promote more diffusion of chromium elements into carbides, increase the precipitation of eutectic carbides, and decrease the carbon content in austenite. In addition, silicon can reduce the size of the solid-liquid two-phase zone, thereby refining the eutectic carbide and making it more dispersedly distributed in austenite. Furthermore, the solid solution of silicon in austenite can play a role in Solid solution strengthening effect improves the performance of the matrix.

Manganese element (Mn): Manganese element is a relatively cheap solid solution element, which usually exists in the form of substitutional solid solution. At the same time, Mn has the function of stabilizing austenite. In high chromium cast iron grinding balls, manganese is one of the common elements. It cannot alone affect the structure and carbides in high chromium cast iron grinding balls. However, manganese is a strong austenite forming element and can refine the primary and the size of the eutectic austenite phase, increasing the solubility of carbon and chromium elements in austenite, thereby inhibiting the formation of pearlite, increasing the stability of austenite, and improving the hardenability of the matrix.

Nickel element (Ni): Nickel can expand the austenite phase area and is an alloy element that stabilizes austenite. The addition of nickel can reduce _MSA , making the matrix composed of austenite and making it less likely to form martensite or other austenite decomposition products. However, when the nickel content is too high, it is inevitable that supercooled austenite will exist in the structure. At the same time, the addition of nickel can also significantly improve the oxidation resistance of high-chromium cast iron grinding balls.

Preferably: the chemical composition weight percentage of the steel ball is: C 3.0-3.2%, Cr 16-22%, Si0.3-1.2%, Mn 1.2-2.6%, Ni 0-1.5%, P≤0.1%, S≤0.1%, Cu 0-2.0%, the rest is iron and inevitable impurities. The remainder is iron and unavoidable impurities.

The chemical composition weight percentage of the steel ball in this application is C 3.0-3.2%, Cr 16-22%, Si 0.3-1.2%, Mn 1.2-2.6%, Ni 0-1.5%, P≤0.1%, S≤0.1% , Cu 0-2.0%, the rest is iron and inevitable impurities. The rest is iron and inevitable impurities. Any value within the respective range can be selected to improve the impact toughness of the wear-resistant steel ball.

Preferably: the chemical composition weight percentage of the steel ball is: C 3.0-3.2%, Cr 16-22%, Si0.3-1.2%, Mn 1.2-2.6%, Ni 0-1.5%, P≤0.1%, S≤0.1%, Cu 0-2.0%, Mo 1.5-3.0%, the rest is iron and inevitable impurities.

By adopting the above technical solution, molybdenum element (Mo) is added to the high chromium cast iron grinding ball, which can improve the performance of the material. Molybdenum can effectively delay pearlite transformation, but rarely affects martensite transformation temperature, thereby obtaining more retained austenite and improving the impact toughness of high-chromium cast iron grinding balls. In addition, when the molybdenum content reaches a certain level, air cooling can fully harden the matrix. Since molybdenum is a strong carbide-forming element, it can easily form Mo ₂ C carbide with carbon. Its hardness can reach 1800-2200HV, which is harder than M ₇ C ₃ , but they are smaller in size and widely distributed in the eutectic structure. , which can significantly improve the wear resistance of high chromium cast iron grinding balls.

In a second aspect, this application provides a production process for the above-mentioned wear-resistant steel ball.

A production process for wear-resistant steel balls includes the following steps:

S1 batching: batch each raw material according to the above ingredients;

S2 electric furnace melting: Under vacuum and argon conditions, heat the materials prepared in S1 to 1500-1800°C to melt each substance into molten iron, then stop heating;

S3 pouring molding: Cool the molten iron obtained in S2 to 1100-1500°C, and then pour it into the mold to obtain a casting ball;

S4 cooling: water-cool the cast ball obtained in S3 to 20-25°C.

By adopting the above technical solution, in S1, the raw materials are batched according to the above ingredients under vacuum and argon conditions, which can reduce the content of gases and impurities. The prepared materials are heated to 1500-1800°C to melt each substance and become After the molten iron is poured, stop heating; then cool the molten iron to 1100-1500°C, so that the molten steel has better fluidity during pouring and molding, which is conducive to filling the mold, and good crystallographic structure and physical properties can be obtained during the solidification process. The cast ball is then water-cooled. Water-cooling cooling can quickly reduce the temperature of the steel ball and prevent overheating from causing deformation of the steel ball or uneven internal structure. Wear-resistant steel balls can be obtained by cooling the ball to 20-25°C.

Preferably: after the step of cooling down to 1100-1500°C during the S3 pouring and molding, a heat preservation step is also included; the heat preservation time is 60-120s.

By adopting the above technical solution, adjusting the temperature of the molten iron to 1100-1500°C and then holding it for 60-120 seconds is to ensure that the temperature of the molten steel is uniform and stable, so that the high-chromium wear-resistant steel material can achieve better fluidity, and the molten high-chromium wear-resistant steel material can be kept warm for 60-120 seconds. Grinding steel materials can be fully mixed and achieve uniform temperature distribution, which helps to improve the quality and consistency of casting molding. It also helps to remove gas and impurities in molten steel and improve the toughness and strength of wear-resistant steel balls.

Preferably: the S4 cooling step also includes a heat preservation step; the heat preservation step is: when the cast ball is water-cooled from 1100-1500°C to 800-920°C, the temperature is maintained for 50-70 minutes.

By adopting the above technical solution, water cooling to 800-920°C will increase the martensite in the cast ball structure and refine the organizational structure. The heat preservation for 50-70 minutes can fully adjust and stabilize the internal organizational structure of the steel ball. Improve the toughness and strength of wear-resistant steel balls.

Preferably: the heat treatment step further includes an air cooling step after the water cooling step.

By adopting the above technical solution, the casting ball is water-cooled and then air-cooled, which can promote the formation of nearly spherical carbides and redistribute carbon atoms, thereby reducing the size and quantity of carbides, and precipitating small-sized particles, which can change the structure of the cast ball. It is more uniform, and it can also alleviate the residual stress inside the material caused by the rapid cooling during quenching, thereby improving the toughness of the material.

Preferably: the air cooling step is: cooling the cast ball to 400-600°C in flowing air at 20-25°C, holding it for 50-70 minutes, and then cooling it naturally to 20-25°C.

By adopting the above technical solution, adjusting the air cooling to 400-600°C and holding the temperature for 50-70 minutes, the structure of the cast ball can be further made uniform, the residual stress inside the material can be further reduced, and the toughness of the material can be improved.

To sum up, this application includes at least one of the following beneficial technical effects:

(1) In this application, by adjusting the chemical composition type and chemical composition of the wear-resistant steel ball, the surface hardness, core hardness and impact toughness of the wear-resistant steel ball are respectively 61.2-61.7HRC, 59.5-60.0HRC and 3.4-3.9J/cm ² , which improves the hardness and impact resistance toughness of the steel ball.

(2) In this application, by adjusting the casting and cooling steps in the wear-resistant steel ball production process, the surface hardness, core hardness and impact toughness of the wear-resistant steel ball are 62.0-62.7HRC and 60.2-60.8HRC respectively. and 4.2-4.8J/cm ² , further improving the hardness and impact resistance toughness of the steel ball.

Therefore, this application adjusts the content of each element in the raw material of the anti-wear steel ball to make Cr/C within the appropriate ratio, and adds molybdenum element, while regulating the production process, so that the obtained steel ball surface hardness and steel ball core hardness The highest impact toughness and impact toughness are 62.7HRC, 60.8HRC and 4.8J/cm ² respectively, and its fatigue life is greater than 18,000 times, and the hardness and toughness are improved to varying degrees.

Description of the drawings

Figure 1 is a flow chart of the production process provided by this application.

Detailed ways

The present application will be further described in detail below with reference to specific embodiments.

The following raw materials in this application are all commercially available products. They are all used to fully disclose the raw materials in this application and should not be understood as limiting the source of the raw materials.

The raw materials of each element of the steel ball in this application include carbon blocks, single crystal silicon blocks, manganese flakes, chromium blocks, molybdenum strips, and the rest are iron blocks with a purity of 99.9%;

Example

The following is an example of preparing a steel ball with a diameter of 10mm.

Example 1

The steel ball of Example 1 is produced through the following production process:

S1 ingredients: According to the chemical composition in Table 1, mix each raw material according to the above ingredients;

S2 electric furnace smelting: evacuate to make the vacuum degree reach 10 ^-2 Pa, and rush in argon gas. Heat the materials prepared in S1 to 1650°C to melt each substance and turn it into molten iron, then stop heating;

S3 pouring molding: Cool the molten iron obtained in S2 to 1100°C, and then pour it into the mold to obtain a casting ball;

S4 cooling: Cool the cast ball obtained in S3 with water to 25°C to obtain a wear-resistant steel ball.

Example 2

The steel ball of Example 2 is produced through the following production process:

S1 ingredients: According to the chemical composition in Table 1, mix each raw material according to the above ingredients;

S2 electric furnace smelting: evacuate to make the vacuum degree reach 10 ^-2 Pa, and rush in argon gas. Heat the materials prepared in S1 to 1650°C to melt each substance and turn it into molten iron, then stop heating;

S3 pouring molding: Cool the molten iron obtained in S2 to 1300°C, and then pour it into the mold to obtain a casting ball;

S4 Cooling: Cool the cast ball obtained in S3 with water to 25°C to obtain a wear-resistant steel ball.

Example 3

The steel ball of Example 3 is produced through the following production process:

S1 ingredients: According to the chemical composition in Table 1, mix each raw material according to the above ingredients;

S2 electric furnace smelting: evacuate to make the vacuum degree reach 10 ^-2 Pa, and rush in argon gas. Heat the materials prepared in S1 to 1650°C to melt each substance and turn it into molten iron, then stop heating;

S3 pouring molding: Cool the molten iron obtained in S2 to 1500°C, and then pour it into the mold to obtain a casting ball;

S4 cooling: Cool the cast ball obtained in S3 with water to 20°C to obtain a wear-resistant steel ball.

Example 4-7

The production process of the steel balls of Examples 4-7 is the same as that of Example 2, except that the chemical composition of the raw materials is different. The details are shown in Table 1.

Table 1 Chemical composition weight percentage (%) of steel balls in Examples 1-7

Example 8-9

The chemical composition and production process of the steel ball in Example 8 are the same as those in Example 6. The difference is that the production process also includes a heat preservation step after the step of cooling to 1300°C during S3 pouring and molding; the heat preservation times are 60s and 120s respectively.

Example 10

The chemical composition and production process of the steel ball in Example 10 are the same as those in Example 8. The difference is that in the production process, the water cooling in S4 cooling is followed by 70 minutes of heat preservation when the temperature reaches 800°C. That is, the S4 cooling step is specifically: water-cooling the cast ball obtained in S3. After cooling to 800°C, keep it warm for 70 minutes, and then water-cool to 25°C.

Example 11

The chemical composition and production process of the steel ball in Example 11 are the same as those in Example 8. The difference is that in the production process, the water cooling in S4 cooling is followed by 50 minutes of heat preservation when the temperature reaches 920°C. That is, the S4 cooling step is specifically: water-cooling the cast ball obtained in S3. After cooling to 920°C, keep warm for 50 minutes, and then water-cool to 25°C.

Example 12

The chemical composition and production process of the steel ball in Example 12 are the same as those in Example 11. The difference is that in the production process, after S4 is cooled and kept warm, air cooling is performed, that is, the S4 cooling step is specifically: water cooling the cast ball obtained in S3 to 920°C. When the temperature is maintained for 50 minutes, the cast ball is cooled to 400°C in flowing air at 25°C. After being kept for 70 minutes, the cast ball is naturally cooled to 25°C.

Example 13

The chemical composition and production process of the steel ball in Example 13 are the same as those in Example 11. The difference is that in the production process, after S4 is cooled and kept warm, air cooling is performed, that is, the S4 cooling step is specifically: water-cooling the cast ball obtained in S3 to 920°C. When the temperature is maintained for 50 minutes, the cast ball is cooled to 600°C in flowing air at 25°C. After being kept for 50 minutes, the cast ball is naturally cooled to 25°C.

Comparative ratio

Comparative Example 1-2

The production process of the steel balls of Comparative Example 1-2 is the same as that of Example 1, except that the chemical composition of the raw materials is different. The details are shown in Table 2.

Table 2 Comparative Example 1-2 Steel Ball Chemical Composition Weight Percentage (%)

Performance testing

GB/T 17445.1-2010 "Wear-resistant Cast Iron Balls. Part 1: Performance" was used to conduct performance testing on the wear-resistant steel balls obtained in different Examples 1-13 and Comparative Examples 1-2. The test results are detailed in the table 3 shown.

Table 3 Performance test results of different wear-resistant steel balls

The test results in Table 3 show that the wear-resistant steel ball obtained in this application has the highest steel ball surface hardness, steel ball core hardness and impact toughness of 62.7HRC, 60.8HRC and 4.8J/cm ² respectively, and its fatigue life is are more than 18,000 times, with high hardness, impact resistance, toughness and fatigue life.

The fatigue life of the wear-resistant steel balls obtained in Examples 1-5 is greater than 18,000 times. The surface hardness, core hardness and impact toughness of the steel balls in Examples 4-5 are 61.4-61.5HRC, 59.8HRC and 3.5 respectively. J/cm ² , are higher than those in Examples 1-3, indicating that when the chemical composition weight percentage of the steel ball is: C 3.0-3.2%, Cr 16-22%, Si 0.3-1.2%, Mn 1.2-2.6%, Ni 0-1.5%, P≤0.1%, S≤0.1%, Cu 0-2.0%, the rest is iron and unavoidable impurities. It is more suitable to improve the hardness and impact resistance toughness of the steel ball.

The fatigue life of the wear-resistant steel balls obtained in Examples 2 and 6-7 are both greater than 18,000 times. The surface hardness, core hardness and impact toughness of the steel balls in Examples 6-7 are 61.6-61.7HRC and 59.9- 60.0HRC and 3.8-3.9J/cm ² , both higher than Example 3, indicating that when the chemical composition weight percentage of the steel ball is: C 3.0-3.2%, Cr 16-22%, Si0.3-1.2%, Mn 1.2 -2.6%, Ni 0-1.5%, P≤0.1%, S≤0.1%, Cu 0-2.0%, Mo0-3.0%, the rest is iron and unavoidable impurities. It is more suitable to improve the hardness and Impact toughness.

The fatigue life of the wear-resistant steel balls obtained in Examples 6 and 8-9 are both greater than 18,000 times. The surface hardness, core hardness and impact toughness of the steel balls in Example 8-9 are 62.0-62.1HRC and 60.1-HRC respectively. 60.2HRC and 4.2-4.3J/cm ² , higher than Example 6, indicating that it is more appropriate to cool down to 1100-1500°C and then hold for 60-120s during S3 casting molding, which improves the hardness and impact resistance toughness of the steel ball. This It may be related to the fact that the temperature of the molten iron is adjusted to 1100-1500°C and then kept warm for 60-120 seconds to ensure that the temperature of the molten steel is uniform and stable.

The fatigue life of the wear-resistant steel balls obtained in Examples 8 and 10-11 are both greater than 18,000 times. The surface hardness, core hardness and impact toughness of the steel ball in Example 10-11 are 62.2-62.3HRC and 60.4-HRC respectively. 60.6HRC and 4.4J/cm ² , which are higher than those in Example 8, indicating that when the cast ball is water-cooled from 1100-1500℃ to 800-920℃ during S4 cooling, it is more appropriate to hold it for 50-70min, which improves the performance of the steel ball. Hardness and impact resistance toughness, this may be related to adjusting the water cooling of the cast ball from 1100-1500°C to 800-920°C and keeping it warm for 50-70 minutes, which can refine and stabilize the structure of the cast ball.

The fatigue life of the wear-resistant steel balls obtained in Examples 11 and 12-13 are both greater than 18,000 times. The surface hardness, core hardness and impact toughness of the steel balls in Examples 12-13 are 62.5-62.7HRC and 60.7- 60.8HRC and 4.6-4.8J/cm ² , higher than Example 11, indicating that when the water cooling step in S4 cooling is followed by an air cooling step, and the air cooling step is adjusted to cool the cast ball in flowing air at 20-25°C When the temperature reaches 400-600°C, it is more appropriate to keep the temperature for 50-70 minutes and then naturally cool to 20-25°C to improve the hardness and impact resistance toughness of the steel ball. This may be related to the adjustment of the water cooling step after the heat treatment step of the cast ball. Air cooling step: cooling the cast ball to 400-600°C in flowing air at 20-25°C, holding it for 50-70 minutes, and then cooling it naturally to 20-25°C, which can reduce the residual stress within the material.

In addition, combined with the various index data of the wear-resistant steel balls of Comparative Examples 1-2 and Example 1, it was found that the application adjusted the content of each element in the raw materials to make Cr/C within the appropriate ratio, and added molybdenum element, while The production process is controlled to increase the hardness and toughness of the wear-resistant steel balls to varying degrees.

This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contribution as needed, but as long as the rights of this application are All requirements are protected by patent law.

Claims (8)

1. The wear-resistant steel ball is characterized by comprising the following chemical components in percentage by weight: 3.0 to 3.2 percent of C, 11 to 26 percent of Cr, 0.3 to 1.2 percent of Si, 1.2 to 2.6 percent of Mn, 0 to 1.5 percent of Ni, less than or equal to 0.1 percent of P, less than or equal to 0.1 percent of S, 0 to 2.0 percent of Cu, and the balance of iron and unavoidable impurities.

2. The wear resistant steel ball of claim 1, wherein the steel ball comprises the following chemical components in weight percent: 3.0 to 3.2 percent of C, 16 to 22 percent of Cr, 0.3 to 1.2 percent of Si, 1.2 to 2.6 percent of Mn, 0 to 1.5 percent of Ni, less than or equal to 0.1 percent of P, less than or equal to 0.1 percent of S, 0 to 2.0 percent of Cu, and the balance of iron and unavoidable impurities.

3. The wear resistant steel ball of claim 2, wherein the steel ball comprises the following chemical components in weight percent: 3.0 to 3.2 percent of C, 16 to 22 percent of Cr, 0.3 to 1.2 percent of Si, 1.2 to 2.6 percent of Mn, 0 to 1.5 percent of Ni, less than or equal to 0.1 percent of P, less than or equal to 0.1 percent of S, 0 to 2.0 percent of Cu, 1.5 to 3.0 percent of Mo, and the balance of iron and unavoidable impurities.

4. A process for producing a wear resistant steel ball as claimed in any one of claims 1 to 3, comprising the steps of:

s1, proportioning: the raw materials are proportioned according to the components;

s2, electric furnace smelting: under the vacuum and argon conditions, heating the materials prepared in the step S1 to 1500-1800 ℃ to melt all the materials into molten iron, and stopping heating;

s3, pouring and forming: cooling the molten iron obtained in the step S2 to 1100-1500 ℃, and casting into a die to obtain a casting ball;

s4, cooling: and (3) cooling the casting ball obtained in the step (S3) to 20-25 ℃.

5. The production process of the wear-resistant steel ball according to claim 4, wherein the step of reducing the temperature to 1100-1500 ℃ in the S3 pouring molding further comprises a heat preservation step; the heat preservation time is 60-120s.

6. The process for producing the wear-resistant steel ball according to claim 4, wherein the step of S4 cooling further comprises a step of heat preservation; the heat preservation step is as follows: when the casting ball is cooled down to 800-920 ℃ from 1100-1500 ℃ by water cooling, the temperature is kept for 50-70min.

7. The process for producing the wear-resistant steel ball according to claim 6, further comprising an air cooling step after the heat preservation step.

8. The process for producing a wear resistant steel ball according to claim 7, wherein said air cooling step is: cooling the cast ball to 400-600deg.C in flowing air of 20-25deg.C, maintaining the temperature for 50-70min, and naturally cooling to 20-25deg.C.