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Bearing steel ball and preparation method thereof

A technology of bearing steel balls and steel balls, which is applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of low performance of bearing steel balls, long annealing time of steel balls, and many network carbides

Inactive Publication Date: 2017-05-31
芜湖市永帆精密模具科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the performance of bearing steel balls in our country is low, the annealing time of steel balls is long, the distribution of carbides inside the steel balls is uneven, and there are many network carbides, so it is necessary to provide new bearing steel balls to improve the performance of bearing steel balls

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A bearing steel ball, the weight percentage of each component is as follows: C: 1%, Cr: 1.53%, Si: 0.25%, Mn: 0.35%, Ni: 0.07%, Mo: 0.11%, Nb: 0.02%, Cu: 0.11%, S: 0.01%, P: 0.01%, and the remainder is Fe.

[0020] The preparation method of above-mentioned bearing steel ball comprises the steps:

[0021] S1. Smelting: Smelting scrap steel, adding carbon, chromium, silicon, manganese, nickel, molybdenum, copper, niobium, roughing, refining, casting out of the furnace to obtain an ingot satisfying the above composition;

[0022] S2. Spheroidizing annealing: Take the cast ingot obtained in S1, roll it, then adjust the temperature to 820°C, keep it warm for 75 minutes, cool it down to 714°C, keep it warm for 2 hours, cool it down to 676°C, air cool to room temperature, cold heading, smooth grinding Get the middle steel ball;

[0023] S3. Heat treatment: Take the middle steel ball obtained in S2, heat up to 830°C, keep it warm for 45 minutes, quench it with water and cool ...

Embodiment 2

[0025] A bearing steel ball, the weight percentage of each component is as follows: C: 0.9%, Cr: 1.6%, Si: 0.15%, Mn: 0.45%, Ni: 0.05%, Mo: 0.12%, Nb: 0.01%, Cu: 0.12%, S: 0.015%, P: 0.015%, and the remainder is Fe.

[0026] The preparation method of above-mentioned bearing steel ball comprises the steps:

[0027] S1. Smelting: Smelting scrap steel, adding carbon, chromium, silicon, manganese, nickel, molybdenum, copper, niobium, roughing, refining, casting out of the furnace to obtain an ingot satisfying the above composition;

[0028] S2. Spheroidizing annealing: take the cast ingot obtained in S1, roll it, then adjust the temperature to 810°C, keep it for 80 minutes, cool it down to 703°C at a rate of 45°C / h, keep it for 3 hours, and keep it at a rate of 15°C / h Cool down to 667°C, air cool to room temperature, cold heading, smooth grinding to get the middle steel ball, wherein, the final rolling temperature of rolling is 900°C;

[0029] S3. Heat treatment: Take the middle...

Embodiment 3

[0031] A bearing steel ball, the weight percentage of each component is as follows: C: 1.1%, Cr: 1.45%, Si: 0.35%, Mn: 0.25%, Ni: 0.1%, Mo: 0.1%, Nb: 0.03%, Cu: 0.1%, S: 0.014%, P: 0.014%, and the remainder is Fe.

[0032] The preparation method of above-mentioned bearing steel ball comprises the steps:

[0033] S1. Smelting: Smelting scrap steel, adding carbon, chromium, silicon, manganese, nickel, molybdenum, copper, niobium, roughing, refining, casting out of the furnace to obtain an ingot satisfying the above composition;

[0034] S2. Spheroidizing annealing: Take the ingot obtained in S1, roll it, then adjust the temperature to 830°C, keep it for 70 minutes, cool it down to 725°C at a rate of 55°C / h, keep it for 1 hour, and keep it at a rate of 20°C / h Cool down to 685°C, air cool to room temperature, cold heading, smooth grinding to get intermediate steel balls, wherein the final rolling temperature of rolling is 850°C;

[0035] S3. Heat treatment: Take the middle steel...

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PUM

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Abstract

The invention discloses a bearing steel ball. The bearing steel ball comprises the following components in percentage by weight: 0.9 to 1.1 percent of C, 1.45 to 1.6 percent of Cr, 0.15 to 0.35 percent of Si, 0.25 to 0.45 percent of Mn, 0.05 to 0.1 percent of Ni, 0.1 to 0.12 percent of Mo, 0.01 to 0.03 percent of Nb, 0.1 to 0.12 percent of Cu, less than or equal to 0.015 percent of S, less than or equal to 0.015 percent of P and the balance of Fe, wherein an expression 'C-11.3Nb is more than 0.55 percent and less than 0.98 percent' is met. The invention also discloses a preparation method of the bearing steel ball. Various elements are mutually matched according to a proper proportion, the formation of network carbide is prevented by a proper preparation method, and uniform distribution of the spherical carbide is promoted, so that the bearing steel ball has high and uniform hardness, high wear resistance, and high elasticity.

Description

technical field [0001] The invention relates to the technical field of steel balls, in particular to a bearing steel ball and a preparation method thereof. Background technique [0002] Bearing steel is the most demanding product among special steel products. The working conditions of bearings are very harsh, and they are under great pressure and friction during work. Therefore, bearing steel is required to have high and uniform hardness, wear resistance and high elasticity. limit. Therefore, it is necessary to strictly require the uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides. [0003] At present, the performance of bearing steel balls in our country is low, the annealing time of steel balls is long, the distribution of carbides inside the steel balls is uneven, and there are many network carbides, so it is necessary to provide new bearing steel balls to improve the per...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C38/44C22C38/42C22C38/04C22C38/02C21D1/32C21D1/18C21D9/36
CPCC22C38/48C21D1/18C21D1/32C21D9/36C22C38/02C22C38/04C22C38/42C22C38/44
Inventor 吴水金
Owner 芜湖市永帆精密模具科技有限公司
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