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Method for heat treatment of ultrahigh-carbon bearing steel

A heat treatment method and bearing steel technology, applied in the field of high carbon steel and bearing steel, can solve the problems of low impact toughness of ultra-high carbon steel, and achieve the effect of improving impact toughness

Active Publication Date: 2014-01-29
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the impact toughness of ultra-high carbon steel treated according to the conventional quenching and tempering heat treatment method is low

Method used

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  • Method for heat treatment of ultrahigh-carbon bearing steel
  • Method for heat treatment of ultrahigh-carbon bearing steel
  • Method for heat treatment of ultrahigh-carbon bearing steel

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Embodiment

[0023] Example: An ultra-high carbon bearing steel, according to the weight percentage (wt.%), its chemical composition is C: 1.10-1.50, Cr: 1.00-2.00, Mn: 0.25-1.00, Si: 0.20-1.50, Al : 1.0-2.0%, the rest is Fe; firstly, this ultra-high carbon bearing steel is forged and spheroidized according to the standard of high-carbon chromium bearing steel, so as to make organizational preparations for further heat treatment.

[0024] After spheroidizing, the ultra-high carbon bearing steel is partially austenitized and retains a certain amount of residual carbides; then, a certain amount of super bainite is formed isothermally in the lower bainite zone (Bs-Ms), and isothermally After oil quenching or water cooling to obtain part of the martensite. The austenitizing temperature is 860-950°C. The heating time for the austenitization is determined according to the effective thickness of the workpiece and the heating coefficient is 1.0-2.0 min / mm. The isothermal temperature is 150-350°C...

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Abstract

The invention provides a method for heat treatment of ultrahigh-carbon bearing steel. The method comprises the following steps of austenitizing a bearing steel part, keeping a certain amount of residual carbides, performing constant temperature treatment in a lower bainite area to form a certain amount of super bainites, and performing oil quenching or water cooling to obtain part of martensite. The structure of the ultrahigh-carbon bearing steel after the heat treatment comprises super bainites, martensite, the remaining carbides and the residual austenites, and the method ensures that the ultrahigh carbon bearing steel has a longer contact fatigue life and higher impact toughness.

Description

technical field [0001] The invention belongs to the technical field of steel heat treatment technology, and in particular relates to high-carbon steel and bearing steel. Background technique [0002] The intrinsic quality of the bearing dominates all factors affecting the fatigue life, and the intrinsic quality of the bearing mainly refers to the inclusions (such as oxides, nitrides) in the bearing steel, so the main measure to improve the bearing life is to reduce the oxygen content. According to the current steelmaking technology, major bearing steel companies in the world, such as Sanyo in Japan and SKF in Sweden, can reduce the oxygen content in bearing steel to 10ppm, while Xingcheng Special Steel in my country is even lower than 5ppm. Under the existing technology, it is difficult to increase the bearing life by reducing the oxygen content, so the developed countries turn to improve the bearing life by controlling the size and shape of the inclusions. On the other ha...

Claims

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Application Information

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IPC IPC(8): C21D6/00C22C38/18
Inventor 柳永宁刘宏基孙俊杰郭生武
Owner XI AN JIAOTONG UNIV
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