CN115323264B - High-wear-resistance steel ball AK-B3 hot rolled round steel and production method thereof - Google Patents
High-wear-resistance steel ball AK-B3 hot rolled round steel and production method thereof Download PDFInfo
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- CN115323264B CN115323264B CN202210821927.6A CN202210821927A CN115323264B CN 115323264 B CN115323264 B CN 115323264B CN 202210821927 A CN202210821927 A CN 202210821927A CN 115323264 B CN115323264 B CN 115323264B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses high wear-resistant steel ball AK-B3 hot rolled round steel and a production method thereof, wherein the high wear-resistant steel ball AK-B3 hot rolled round steel comprises the following chemical components in percentage by mass: c:0.58-0.62%, mn:0.65-0.75%, si:1.60-1.80%, cr:0.70-0.80%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, and the balance is Fe and unavoidable impurities. The high wear-resistant steel ball AK-B3 hot rolled round steel provided by the invention has excellent wear resistance.
Description
Technical Field
The invention belongs to the field of metallurgical materials, and particularly relates to high-wear-resistance steel ball AK-B3 hot rolled round steel and a production method thereof.
Background
Along with the enlargement of the semi-autogenous mill at home and abroad and the increase of the usage amount, the demand of the large-diameter wear-resistant steel ball is gradually increased, and the former forming process of the large-diameter wear-resistant steel ball mainly comprises medium-frequency induction heating, air hammer forging or press extrusion forming, but the forming processes have some problems. Intermediate frequency induction heating is adopted: the inner and outer temperature of the round steel is uneven in the rapid heating process due to the shape characteristics of the round steel, so that austenitizing of the round steel is uneven, the quality uniformity of the product is poor, and the quality is unstable; forging by adopting an air hammer: the working procedure has high environmental temperature, high labor intensity and low production efficiency, the output per hour of a single machine is about 1 ton, and the uniformity and the stability of the product quality cannot be ensured; the extrusion by adopting a press machine does not meet the compression ratio of steel ball molding, so that the compactness of the steel ball is poor, and crystal grains cannot be refined, thereby influencing the quality of steel ball products.
Increasing the hardness of the ball is the most effective way to reduce wear. The normal abrasion of the grinding ball is the abrasion process of changing a big ball into a small ball, and the normal efficacy of grinding ball grinding can be ensured only by maintaining the round shape in the whole abrasion process and ensuring that the inside and the outside of the grinding ball have enough hardness and abrasion resistance. If the hardness of the grinding ball is uneven, the grinding ball is out of round in the process of abrasion, if the hardness difference between the inner and outer of the grinding ball is large and the hardening layer is shallow, the abrasion is increased severely after the hardening layer of the outer layer is abraded; therefore, the difference between the internal and external hardness of the good grinding ball should be small. The industry standard of grinding balls for metallurgical mines specifies that the hardness difference of the surface and the core of the grinding balls is not more than 3HRC.
The addition of alloy elements is very beneficial to reducing the difference of the internal hardness and the external hardness of the steel ball and improving the wear resistance of the steel ball, but firstly increases the cost of alloy raw materials, secondly increases the production difficulty and the complexity of the production process, and further increases the manufacturing cost; therefore, it is very important to develop a high-quality and low-cost steel for grinding balls.
Disclosure of Invention
Aiming at one or more problems in the prior art, one aspect of the invention provides high wear-resistant steel ball AK-B3 hot rolled round steel, which comprises the following chemical components in percentage by mass: c:0.58-0.62%, mn:0.65-0.75%, si:1.60-1.80%, cr:0.70-0.80%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, and the balance is Fe and unavoidable impurities.
In some embodiments, the high wear-resistant steel ball AK-B3 hot rolled round steel comprises the following chemical components in percentage by mass: c:0.60-0.61%, mn:0.74-0.75%, si:1.70-1.73%, cr:0.71-0.72%, P less than or equal to 0.020%, S less than or equal to 0.010%, and the balance of Fe and unavoidable impurities.
In some embodiments, the high wear resistant steel ball AK-B3 hot rolled round steel has a surface hardness of 60HRC or more, a core hardness of 57HRC or more, and a surface and core hardness difference of 3HRC or less.
In some embodiments, the high wear resistant steel ball AK-B3 hot rolled round steel has a surface hardness of greater than or equal to 63HRC, a core hardness of greater than or equal to 61HRC, and a surface and core hardness difference of less than or equal to 2HRC.
In some embodiments, the inclusion grade of the high wear resistant steel ball AK-B3 hot rolled round steel satisfies: class A is less than or equal to 1.5, class B is less than or equal to 1.5, class C is less than or equal to 1.0, and class D is less than or equal to 1.5.
In some embodiments, the inclusion grade of the high wear resistant steel ball AK-B3 hot rolled round steel satisfies: class A is less than or equal to 1.5, class B is less than or equal to 1.0, class C is less than or equal to 0.5, and class D is less than or equal to 1.0.
The invention also provides a production method of the high wear-resistant steel ball AK-B3 hot rolled round steel, which comprises the following steps: converter-external refining-VD vacuum treatment-continuous casting-casting blank slow cooling-casting blank heating-high-pressure water descaling-phi 850mm cogging machine and phi 700mm multiplied by 3+phi 550mm multiplied by 4 continuous rolling mill rolling-slow cooling; wherein:
the converter process adopts double slag operation, and the final alkalinity is controlled according to 3.0; the converter end point control target C is more than or equal to 0.06 percent, and P is less than or equal to 0.020 percent;
the deep vacuum time in the VD vacuum treatment process is more than or equal to 13min, and the soft blowing time is more than or equal to 15min;
in the continuous casting process, the superheat degree is less than or equal to 30 ℃, and the pulling speed of a casting machine is less than or equal to 0.62m/min;
in the casting blank slow cooling process, the casting blank slow cooling time is more than or equal to 48 hours;
in the casting blank heating process, the heating temperature is less than or equal to 1250 ℃;
in the rolling process, the initial rolling temperature is less than or equal to 1100 ℃, and the final rolling temperature is less than or equal to 890 ℃;
in the slow cooling process, the temperature of the slow cooling pit is more than or equal to 500 ℃.
Based on the technical scheme, the high-wear-resistance steel ball AK-B3 hot rolled round steel with matched hardness and toughness is obtained by reasonably controlling the contents of C and Cr elements, controlling the size of inclusions through a steelmaking process and controlling the structure transformation and grain size of a hot rolled state through a steel rolling process, and has the following advantages:
1) The rolled structure is a ferrite and pearlite structure, has high strength and high toughness, and is easy for subsequent processing of the high-wear-resistance steel ball;
2) The steel ball has high hardness and small surface and core hardness difference, wherein the surface hardness is more than or equal to 60HRC (preferably more than or equal to 63 HRC), the core hardness is more than or equal to 57HRC (preferably more than or equal to 61 HRC), the surface and core hardness difference is less than or equal to 3HRC (preferably less than or equal to 2 HRC), and further the steel ball has excellent wear resistance.
Detailed Description
The invention aims to provide high wear-resistant steel ball AK-B3 hot-rolled round steel with excellent wear resistance and also provides a production method of the high wear-resistant steel ball AK-B3 hot-rolled round steel.
In a first aspect of the invention, a high wear-resistant steel ball AK-B3 hot rolled round steel is provided, which comprises the following chemical components in percentage by mass: c:0.58-0.62%, mn:0.65-0.75%, si:1.60-1.80%, cr:0.70-0.80%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, and the balance is Fe and unavoidable impurities; preferably, the high wear-resistant steel ball AK-B3 hot rolled round steel comprises the following chemical components in percentage by mass: c:0.60-0.61%, mn:0.74-0.75%, si:1.70-1.73%, cr:0.71-0.72%, P less than or equal to 0.020%, S less than or equal to 0.010%, and the balance of Fe and unavoidable impurities.
In some embodiments, the high wear resistant steel ball AK-B3 hot rolled round steel is provided with a surface hardness of more than or equal to 60HRC, a core hardness of more than or equal to 57HRC, and a surface and core hardness difference of less than or equal to 3HRC, preferably, the high wear resistant steel ball AK-B3 hot rolled round steel is provided with a surface hardness of more than or equal to 63HRC, a core hardness of more than or equal to 61HRC, and a surface and core hardness difference of less than or equal to 2HRC.
In a second aspect of the invention, a method for producing high wear resistant steel ball AK-B3 hot rolled round steel is provided, comprising the following processes: converter-external refining-VD vacuum treatment-continuous casting-casting blank slow cooling-casting blank heating-high-pressure water descaling-phi 850mm cogging machine and phi 700mm multiplied by 3+phi 550mm multiplied by 4 continuous rolling mill rolling-slow cooling; wherein:
the converter process adopts double slag operation, and the final alkalinity is controlled according to 3.0; the converter end point control target C is more than or equal to 0.06 percent, such as 0.10 to 0.13 percent; p is less than or equal to 0.020%;
the deep vacuum time in the VD vacuum treatment process is more than or equal to 13min, and the soft blowing time is more than or equal to 15min;
in the continuous casting process, the superheat degree is less than or equal to 30 ℃, and the pulling speed of a casting machine is less than or equal to 0.62m/min;
in the casting blank slow cooling process, the casting blank slow cooling time is more than or equal to 48 hours;
in the casting blank heating process, the heating temperature is less than or equal to 1250 ℃, the heating temperature is selected to be 1230-1250 ℃, and the heating temperature is further selected to be 1230-1235 ℃;
in the rolling process, the initial rolling temperature is less than or equal to 1100 ℃, the initial rolling temperature is selected to be 1076-1091 ℃, the final rolling temperature is less than or equal to 890 ℃, and the final rolling temperature is selected to be 876-885 ℃;
in the slow cooling process, the temperature of the slow cooling pit is more than or equal to 500 ℃, and is optionally 527-540 ℃.
The following describes the invention in detail by way of specific examples, which are intended to aid in understanding the invention and are not intended to limit the invention.
Example 1: production of high wear-resistant steel ball AK-B3 hot rolled round steel
This example is aimed at producing a high wear resistant steel ball AK-B3 hot rolled round steel, the chemical composition of the high wear resistant steel ball AK-B3 hot rolled round steel and its content are shown in table 1 below, the production method specifically includes the following processes: converter-external refining-VD vacuum treatment-continuous casting-slow cooling of casting blank (steel making process above), casting blank heating-descaling by high-pressure water-phi 850mm cogging mill and phi 700mm multiplied by 3+phi 550mm multiplied by 4 continuous rolling mill rolling-sawing (sampling) -slow cooling (steel rolling process above) -nondestructive detection (ultrasonic flaw detection + eddy current/infrared/magnetic leakage flaw detection) -inspection-grinding-bundling-warehousing; wherein the control requirements of the process parameters are as follows:
the converter process adopts double slag operation, and the final alkalinity is controlled according to 3.0; the converter end point control target C is more than or equal to 0.06 percent, and P is less than or equal to 0.020 percent;
the deep vacuum time in the VD vacuum treatment process is more than or equal to 13min, and the soft blowing time is more than or equal to 15min;
in the continuous casting process, the superheat degree is less than or equal to 30 ℃, for example, 25-28 ℃, and the drawing speed of a casting machine is less than or equal to 0.62m/min;
in the casting blank slow cooling process, the casting blank slow cooling time is more than or equal to 48 hours;
in the casting blank heating process, the heating temperature is less than or equal to 1250 ℃;
in the rolling process, the initial rolling temperature is less than or equal to 1100 ℃, and the final rolling temperature is less than or equal to 890 ℃;
in the slow cooling process, the temperature of the slow cooling pit is more than or equal to 500 ℃.
Specific process parameter controls are shown in tables 2 and 3 below.
The high wear resistant steel ball AK-B3 hot rolled round steel produced in this example was examined for its surface hardness and core hardness, respectively, and the examination results are shown in table 4 below. The rolling state structure of the high wear-resistant steel ball AK-B3 hot rolled round steel is detected and is a ferrite and pearlite structure, so that the hot rolled round steel has high strength and high toughness, and the subsequent processing of the high wear-resistant steel ball is easy.
Examples 2 to 5
Examples 2 to 5 were conducted in accordance with the procedure of example 1 except that the chemical composition content and the process parameters of the hot rolled round steel were varied, as shown in tables 1 to 3 below. The hot rolled round steels produced in examples 2 to 5 were also examined for surface hardness and core hardness, and the results are shown in Table 4 below.
Comparative examples 1 to 4
Comparative examples 1 to 4 were conducted in accordance with the procedure of example 1 except that the chemical component contents of the hot rolled round steel were varied, as shown in Table 1 below. The hot rolled round steels produced in comparative examples 1 to 4 were also examined for surface hardness and core hardness, and the results are shown in Table 4 below.
Table 1: chemical composition and content (%)
| C | Si | Mn | P | S | Cr | |
| Example 1 | 0.60 | 1.70 | 0.75 | 0.018 | 0.010 | 0.72 |
| Example 2 | 0.61 | 1.73 | 0.75 | 0.019 | 0.009 | 0.72 |
| Example 3 | 0.60 | 1.72 | 0.74 | 0.018 | 0.008 | 0.71 |
| Example 4 | 0.58 | 1.60 | 0.65 | 0.021 | 0.015 | 0.70 |
| Example 5 | 0.62 | 1.80 | 0.75 | 0.025 | 0.025 | 0.80 |
| Comparative example 1 | 0.75 | 1.70 | 0.75 | 0.019 | 0.010 | 0.85 |
| Comparative example 2 | 0.51 | 1.70 | 0.75 | 0.018 | 0.008 | 0.65 |
| Comparative example 3 | 0.50 | 1.70 | 0.75 | 0.019 | 0.010 | 0.91 |
| Comparative example 4 | 0.74 | 1.70 | 0.75 | 0.018 | 0.009 | 0.62 |
Table 2: steelmaking process parameter control for each of the examples and comparative examples
Table 3: steel rolling process parameter control for each example and comparative example
| Heating temperature (. Degree. C.) | Initial rolling temperature (. Degree. C.) | Finishing temperature (. Degree. C.) | Temperature of slow cooling pit (DEG C) | |
| Example 1 | 1235 | 1085 | 880 | 530 |
| Example 2 | 1234 | 1076 | 885 | 527 |
| Example 3 | 1230 | 1091 | 876 | 540 |
| Example 4 | 1235 | 1086 | 885 | 540 |
| Example 5 | 1230 | 1081 | 880 | 535 |
| Comparative example 1 | 1235 | 1085 | 880 | 530 |
| Comparative example 2 | 1235 | 1085 | 880 | 530 |
| Comparative example 3 | 1235 | 1085 | 880 | 530 |
| Comparative example 4 | 1235 | 1085 | 880 | 530 |
Table 4: hardness test results (HRC) of hot rolled round steels produced in examples and comparative examples
| Surface hardness | Average value of surface hardness | Hardness of core | Average value of core hardness | Surface and core hardness differences | |
| Example 1 | 63/64/64 | 63.7 | 61/62/61 | 61.7 | 1.8 |
| Example 2 | 63/63/64 | 63.3 | 62/62/62 | 62.0 | 1.3 |
| Example 3 | 64/65/63 | 64.0 | 61/63/62 | 62.0 | 2.0 |
| Example 4 | 60/62/60 | 60.7 | 58/58/57 | 57.7 | 3.0 |
| Example 5 | 65/65/64 | 64.7 | 63/62/63 | 62.7 | 2.7 |
| Comparative example 1 | 65/63/66 | 64.7 | 60/59/62 | 60.3 | 4.4 |
| Comparative example 2 | 58/56/59 | 57.7 | 55/53/53 | 53.7 | 4.0 |
| Comparative example 3 | 62/62/63 | 62.3 | 59/57/58 | 58.0 | 4.3 |
| Comparative example 4 | 57/59/57 | 57.7 | 55/56/54 | 55.0 | 2.7 |
From the results shown in tables 1 and 4, it is understood that the hot rolled round steels obtained in examples 1 to 5 were each produced to have higher surface hardness and core hardness by properly controlling the contents of C and Cr elements, and the difference between the surface hardness and core hardness was within 3HRC, and in particular, the hot rolled round steels produced in examples 1 to 3 were able to control the difference between the surface hardness and core hardness within 2HRC. The adjustment of the C and/or Cr content in the hot-rolled round steel according to comparative examples 1 to 4 relative to example 1 resulted in a decrease in the hardness (surface hardness and core hardness) and/or an increase in the difference between the surface hardness and core hardness (e.g., exceeding 3 HRC) of the hot-rolled round steel produced.
The inventors also analyzed the inclusion sizes of the hot rolled round steels produced in examples 1 to 5 above, and the results are shown in Table 5 below. It can be seen that the inclusion grade of the hot rolled round steel satisfies: class A is less than or equal to 1.5, class B is less than or equal to 1.5, class C is less than or equal to 1.0, and class D is less than or equal to 1.5; preferably, the following are satisfied: class A is less than or equal to 1.5, class B is less than or equal to 1.0, class C is less than or equal to 0.5, and class D is less than or equal to 1.0.
Table 5: inclusion size of hot rolled round steels produced in examples 1 to 5
| Examples | Class A | Class B | Class C | Class D |
| 1 | 1.0 | 1.0 | 0.5 | 1.0 |
| 2 | 1.5 | 1.0 | 0.5 | 1.0 |
| 3 | 1.5 | 1.0 | 0.5 | 1.0 |
| 4 | 1.5 | 1.5 | 1.0 | 1.5 |
| 5 | 1.5 | 1.5 | 1.0 | 1.5 |
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalents may be substituted for part of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The high wear-resistant steel ball AK-B3 hot rolled round steel comprises the following chemical components in percentage by mass: c:0.58-0.62%, mn:0.65-0.75%, si:1.60-1.80%, cr:0.70-0.80%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, and the balance is Fe and unavoidable impurities;
the surface hardness of the high wear-resistant steel ball AK-B3 hot rolled round steel is more than or equal to 60HRC, the core hardness is more than or equal to 57HRC, and the difference between the surface hardness and the core hardness is less than or equal to 3 HRC;
the production method of the high wear-resistant steel ball AK-B3 hot rolled round steel comprises the following steps: converter-external refining-VD vacuum treatment-continuous casting-casting blank slow cooling-casting blank heating-high-pressure water descaling-phi 850mm cogging machine and phi 700mm multiplied by 3+phi 550mm multiplied by 4 continuous rolling mill rolling-slow cooling; wherein:
the converter process adopts double slag operation, and the final alkalinity is controlled according to 3.0; the converter end point control target C is more than or equal to 0.06 percent, and P is less than or equal to 0.020 percent;
the deep vacuum time in the VD vacuum treatment process is more than or equal to 13min, and the soft blowing time is more than or equal to 15min;
in the continuous casting process, the superheat degree is less than or equal to 30 ℃, and the pulling speed of a casting machine is less than or equal to 0.62m/min;
in the casting blank slow cooling process, the casting blank slow cooling time is more than or equal to 48 hours;
in the casting blank heating process, the heating temperature is less than or equal to 1250 ℃;
in the rolling process, the initial rolling temperature is less than or equal to 1100 ℃, and the final rolling temperature is less than or equal to 890 ℃;
in the slow cooling process, the temperature of the slow cooling pit is more than or equal to 500 ℃.
2. The high wear-resistant steel ball AK-B3 hot rolled round steel as recited in claim 1, which comprises the following chemical components in percentage by mass: c:0.60-0.61%, mn:0.74-0.75%, si:1.70-1.73%, cr:0.71-0.72%, P less than or equal to 0.020%, S less than or equal to 0.010%, and the balance of Fe and unavoidable impurities.
3. The high wear resistant steel ball AK-B3 hot rolled round steel as claimed in claim 1, wherein the surface hardness is not less than 63HRC, the core hardness is not less than 61HRC, and the difference between the surface and core hardness is not more than 2HRC.
4. A high wear resistant steel ball AK-B3 hot rolled round steel according to any one of claims 1-3, having inclusion grade satisfying: class A is less than or equal to 1.5, class B is less than or equal to 1.5, class C is less than or equal to 1.0, and class D is less than or equal to 1.5.
5. The high wear resistant steel ball AK-B3 hot rolled round steel according to claim 4, wherein the inclusion grade satisfies: class A is less than or equal to 1.5, class B is less than or equal to 1.0, class C is less than or equal to 0.5, and class D is less than or equal to 1.0.
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| CN112239834A (en) * | 2020-09-02 | 2021-01-19 | 包头钢铁（集团）有限责任公司 | Steel for high-strength and high-wear-resistance rare earth ball mill hot-rolled steel balls and rolling method thereof |
| CN112342460A (en) * | 2020-09-03 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | Steel for B2 high-end steel ball of ball mill and rolling method thereof |
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| CL2012003184A1 (en) * | 2012-11-14 | 2013-08-02 | Compañía Electro Metalúrgica S A | Production method of high hardness cast steel and excellent abrasion and impact wear resistance for large wear coatings in mining grinding and crushing applications that comprises completely melting the steel and heat treatment of tempering and tempering; and cast steel of high purity and wear resistance. |
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| CN110791619A (en) * | 2019-11-29 | 2020-02-14 | 南昌航空大学 | Large-diameter forged grinding ball for mine and preparation process thereof |
| CN112239834A (en) * | 2020-09-02 | 2021-01-19 | 包头钢铁（集团）有限责任公司 | Steel for high-strength and high-wear-resistance rare earth ball mill hot-rolled steel balls and rolling method thereof |
| CN112342460A (en) * | 2020-09-03 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | Steel for B2 high-end steel ball of ball mill and rolling method thereof |
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