Rolling bearing heat treatment process method

Abstract

The invention relates to a rolling bearing heat treatment process method for rolling bearing steel. The invention provides a rolling bearing heat treatment process method, which makes the rolling bearing steel have longer rolling contact-resistant fatigue life, high cracking resistance and limited aging size change. The rolling bearing steel heat treatment process method comprises the following steps of: performing carbonitriding on the steel for a bearing component at the carbonitriding temperature higher than a phase-transition temperature A; cooling the steel to the temperature lower than the phase-transition temperature; heating the rolling bearing steel to the quenching temperature, wherein the temperature is not lower than the phase-transition temperature and is lower than the carbonitriding temperature; and performing quenching process on the steel.

Description

Technical field: [0001] The invention relates to a heat treatment process method for rolling bearings used in compressors matched with mechanical transporters. Background technique: [0002] At present, in the heat treatment method of rolling bearings in the bearing industry, as a method to ensure the service life of bearing components against rolling contact fatigue, the surface layer of rolling bearings can be heated by adding ammonia to the atmosphere of RX gas for carbonitriding Heat treatment process processing technology. This carbonitriding can partially harden the surface layer of steel parts, and also produce residual austenite in the microstructure, so as to ensure comprehensive mechanical properties such as contact fatigue life of rolling bearings. However, since carbonitriding involves diffusion, the bearing components need to be kept at high temperature for a long time, which will make the microstructure coarse and it will be difficult to increase its crack res...

AI Technical Summary

Problems solved by technology

However, since carbonitriding involves diffusion, the bearing components need to be kept at high temperature for a long time, which will make the microstructure coarse and it will be difficult to increase its crack strength

In addition, due to the increase of retained austenite, there is a problem that the aged size increases

So that the bearing steel will increase the cost of raw materials