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Heat treatment process for bearing steel

A technology of bearing steel and process, which is applied in the field of heat treatment process of GCr15 bearing steel, can solve the problems of high sensitivity to white spots, poor cutting performance and welding performance, general cold working plasticity, etc.

Inactive Publication Date: 2012-07-04
张莹
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0011] Although the steel has high hardness, good wear resistance and fatigue resistance after being treated by the above quenching process, it has the disadvantages of general cold working plasticity, poor cutting performance and welding performance, especially for the formation of white steel. High point sensitivity and temper brittleness

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The present invention is described in detail below in conjunction with embodiment:

[0020] Carry out heat treatment to GCr15 bearing steel according to the technical scheme provided by the present invention, the chemical composition (weight percentage) of sample is: C 0.90, Mn 0.30, Si 0.25, S 0.020, P 0.025, Cr 1.50.

[0021] The sample was heated to 870°C for austenitization and then quenched. It was kept in a salt bath at 160°C for 20 minutes and then air-cooled. Austenite is thermally stabilized, and after final tempering, the amount of retained austenite increases to 13.2%; the isothermal time is extended to 60min, and the content of retained austenite no longer increases. Immediately after martensite quenching, cold treatment can effectively eliminate residual austenite and reduce it to less than 5%. After the sample martensite isothermal for 60 minutes, a small amount of retained austenite transforms into isothermal martensite, which increases the wear resistan...

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Abstract

The invention provides a heat treatment process for a bearing steel. According to the process, the technology measure of combination of quenching temperature increasing and an isothermal treatment is adopted to change the internal organizational structure of the steel so as to comprehensively improve the comprehensive properties of the chromium-containing bearing steel. The experiment results show that: the completely-austenitized chromium-containing bearing steel is subjected to isothermal quenching and tempering pretreatment, the treated carbide has characteristics of fine and uniform property, and dispersed distribution; with the refined austenite grains, the wear resistance of the steel is increased by more than 30%; the cold processing plasticity of the steel is improved, and the cutting property and the welding performance of the steel are substantially improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a heat treatment process of GCr15 bearing steel. Background technique [0002] In the field of bearing manufacturing, GCr15 steel has less alloy content, has good performance and high hardenability, and can obtain high and uniform hardness after heat treatment. It is the most widely used high-chromium bearing steel. Commonly used to make balls, bearing rings, etc. Such as the manufacture of H-class to C-class bearing sleeves with a wall thickness of 12mm and an outer diameter of <250mm; steel balls with a diameter of 25.4-50.8mm; rollers with a diameter of <22mm; in addition, they can also be used to withstand large loads and require high wear resistance. Other mechanical parts with high elasticity, high elastic limit, high contact fatigue strength and cold stamping dies of various precision measuring tools, etc. Such as the ball scre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/19
Inventor 张莹
Owner 张莹
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