Rolling fatigue resistant bearing steel ball and preparation method thereof

A bearing steel ball and rolling fatigue technology, which is applied in the field of steel balls, can solve problems such as cracks on the surface or inside of steel balls, low performance of bearing steel balls, low rolling fatigue resistance of steel balls, etc.

Inactive Publication Date: 2017-05-10
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, and cracks are easily generated on the surface or inside of the steel balls during use, resulting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An anti-rolling fatigue bearing steel ball, the weight percentage of each component is as follows: C: 1.05%, Cr: 1.45%, Si: 0.3%, Mn: 0.4%, Ni: 0.03%, Mo: 0.12%, Nb: 0.035%, S: 0.015%, P: 0.015%, Al: 0.473%, and the rest is Fe.

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

[0021] S1. Smelting: Take scrap steel for smelting, add carbon, chromium, silicon, manganese, nickel, molybdenum, niobium, aluminum, rough smelt, refine, take out the furnace and cast 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 850°C, hold it for 30 minutes, cool it down to 750°C, hold it for 50 minutes, then raise the temperature to 850°C, hold it for 50 minutes, and cool it down to 700°C. Keep warm for 1.5h, cool down to 645°C, air cool to room temperature, cold heading, and smooth grinding to get...

Embodiment 2

[0025] An anti-rolling fatigue bearing steel ball, the weight percentage of its components is as follows: C: 1%, Cr: 1.5%, Si: 0.2%, Mn: 0.5%, Ni: 0.02%, Mo: 0.15%, Nb: 0.03%, S: 0.02%, P: 0.02%, Al: 0.505%, and the rest is Fe.

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

[0027] S1. Smelting: Take scrap steel for smelting, add carbon, chromium, silicon, manganese, nickel, molybdenum, niobium, aluminum, rough smelt, refine, take out the furnace and cast 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 860°C, keep it for 20 minutes, cool it down to 740°C at a rate of 5°C / min, keep it for 60 minutes, and then heat it at a rate of 3°C / min. Speed ​​up to 830°C, hold for 40 minutes, cool down to 690°C at a speed of 20°C / s, hold for 2 hours, cool down to 650°C at a speed of 10°C / s, air...

Embodiment 3

[0031] An anti-rolling fatigue bearing steel ball, the weight percentage of its components is as follows: C: 1.1%, Cr: 1.4%, Si: 0.4%, Mn: 0.3%, Ni: 0.04%, Mo: 0.1%, Nb: 0.04%, S: 0.018%, P: 0.018%, Al: 0.44%, and the rest is Fe.

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

[0033] S1. Smelting: take scrap steel for smelting, add carbon, chromium, silicon, manganese, nickel, molybdenum, niobium, aluminum, rough smelt, refine, take out the furnace and cast to obtain an ingot satisfying the above composition;

[0034] S2. Spheroidizing annealing: Take the cast ingot obtained in S1, roll it, then adjust the temperature to 840°C, keep it for 40 minutes, cool it down to 760°C at a rate of 3°C / min, keep it for 40 minutes, and then heat it at a rate of 5°C / min. Speed ​​up to 810°C, hold for 60 minutes, cool down to 710°C at a speed of 15°C / s, hold for 1 hour, cool down to 640°C at a speed of 15°C / s, ai...

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PUM

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Abstract

The invention discloses a rolling fatigue resistant bearing steel ball. The rolling fatigue resistant bearing steel ball comprises the following components of, by weight, 1%-1.1% of C, 1.4%-1.5% of Cr, 0.2%-0.4% of Si, 0.3%-0.5% of Mn, 0.02%-0. 04% of Ni, 0.1%-0.15% of Mo, 0.03%-0.04% of Nb, 0-0.02% of S, 0-0.02% of P, Al, and the balance Fe, wherein the expression of 'Al=C-16.5 Nb' is met. The invention further discloses a preparation method of the rolling fatigue resistant bearing steel ball. The rolling fatigue resistant bearing steel ball has good hardness, abrasion resistance and rolling fatigue resistance.

Description

technical field [0001] The invention relates to the technical field of steel balls, in particular to an anti-rolling fatigue 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 and wear resistance, as well as high Elastic limit and high resistance to rolling fatigue. 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, and cracks are easily generated on the surface or inside of the steel balls during use, resulting in low rolling fatigue resistance of the steel ba...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/08C22C38/02C22C38/04C22C38/12C22C38/06C22C33/04C21D6/00
CPCC22C38/18C21D6/004C21D6/005C21D6/008C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 吴水金
Owner 芜湖市永帆精密模具科技有限公司
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