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Low-manganese cast grinding ball

A casting grinding ball, a low-level technology, applied in the field of casting grinding balls, can solve problems such as uneven hardness, increased production cost of casting grinding balls, insufficient hardenability, etc., to improve hardenability, optimize composition and heat treatment process, improve The effect of the tempering effect

Active Publication Date: 2014-10-22
宁国东方碾磨材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the heat treatment process is not perfect, and the cast grinding balls produced by the process have defects such as insufficient hardenability and uneven hardness, so it is often necessary to add precious metals to improve hardenability, thus increasing the production cost of cast grinding balls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Prepare as follows:

[0021] S1: Weighing each raw material according to the mass fraction, casting and molding after smelting to obtain a semi-finished product of cast grinding ball;

[0022] S2: Put the semi-finished product of the grinding ball obtained in S1 into the furnace and heat it up to 520°C for 150 minutes, heat it up to 750°C for 150 minutes, heat it up to 920°C for 150 minutes, heat it up to 1000°C for 150 minutes, and heat it at an oil temperature of 100°C. Oil quenching was carried out in the quenching oil, and the quenching time was 8 minutes. After oil quenching, it was placed in a holding furnace at a heating rate of 60 ℃ / h from room temperature to 350 ℃ for 480 minutes, and then slowly cooled to room temperature for 460 minutes to obtain cast grinding balls.

Embodiment 2

[0024] Prepare as follows:

[0025] S1: Weighing each raw material according to the mass fraction, casting and molding after smelting to obtain a semi-finished product of cast grinding ball;

[0026] S2: Put the semi-finished product of the grinding ball obtained in S1 into the furnace and heat it up to 530°C for 140 minutes, then heat it up to 760°C for 140 minutes, heat it up to 960°C for 140 minutes, heat it up to 1040°C for 140 minutes, and heat it at an oil temperature of 120°C. Oil quenching was carried out in the quenching oil, and the quenching time was 14 minutes. After oil quenching, it was put into a holding furnace at a heating rate of 100 ℃ / h from room temperature to 380 ℃ for 470 minutes, and then slowly cooled to room temperature for 470 minutes to obtain cast balls.

Embodiment 3

[0028] Prepare as follows:

[0029] S1: Weighing each raw material according to the mass fraction, casting and molding after smelting to obtain a semi-finished product of cast grinding ball;

[0030] S2: Put the semi-finished product of the grinding ball obtained in S1 into the furnace and heat it up to 510°C for 160 minutes, then heat it up to 740°C for 160 minutes, heat it up to 880°C for 140 minutes, heat it up to 970°C for 140 minutes, and heat it at an oil temperature of 75°C. Oil quenching was carried out in the quenching oil for 3 minutes. After oil quenching, it was placed in a holding furnace at a rate of 20°C / h from room temperature to 300°C for 490 minutes, and then slowly cooled to room temperature for 450 minutes to obtain cast grinding balls.

[0031] In Examples 1-3, various properties of the prepared cast grinding balls were tested, and the performance data are shown in Table 2.

[0032]

[0033] The data in the above table 2 shows that the cast gr...

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PUM

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Abstract

The invention discloses a low-manganese cast grinding ball which is composed of the following components in percentage by mass: 2.1-2.8% of C, 0.3-0.8% of Si, 0.08-0.6% of Mn, 10-23% of Cr, 0-0.05% of P, 0-0.05% of S, 0.03-0.06% of Al and the balance of Fe. The grinding ball is prepared by the following steps: S1: weighing the raw materials according to percentage by mass, smelting, and carrying out casting molding to obtain a cast grinding ball semi-finished product; and S2: putting the grinding ball semi-finished product obtained in the step S1 into the furnace, heating to 510-530 DEG C, keeping the temperature for 140-160 minutes, heating to 740-760 DEG C, keeping the temperature for 140-160 minutes, heating to 880-960 DEG C, keeping the temperature for 140-160 minutes, heating to 970-1040 DEG C, keeping the temperature for 140-160 minutes, carrying out oil quenching in quenching oil with the temperature of 75-120 DEG C for 3-14 minutes, putting in a holding furnace, heating from room temperature to 300-380 DEG C at the heating rate of 20-100 DEG C / hour, keeping the temperature for 470-490 minutes, and slowly cooling to room temperature within 450-470 minutes to obtain the cast grinding ball. The cast grinding ball has favorable comprehensive properties.

Description

technical field [0001] The invention relates to the technical field of casting grinding balls, in particular to a low-micromanganese casting grinding ball. Background technique [0002] Cast grinding balls are commonly used wear-resistant materials in building materials, chemical industry, metallurgy, mineral processing, cement, thermal power and other industries. They are favored by large enterprise groups for their excellent wear resistance. However, in the prior art, the heat treatment process is not perfect, and the cast grinding balls produced by the process have defects such as insufficient hardenability and uneven hardness, so it is often necessary to add precious metals to improve hardenability, thus increasing the production cost of cast grinding balls . Therefore, it is necessary to improve the heat treatment process, thereby improving the comprehensive performance of cast steel balls and reducing the production cost of cast grinding balls. Contents of the inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C21D9/36C21D1/18C21D5/00
Inventor 赵金斌杨霄葛兴洋
Owner 宁国东方碾磨材料股份有限公司
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