Bearing material

Features of bearing steel:

1. Contact fatigue strength

Under the action of periodic load, the contact surface of the bearing is prone to fatigue damage, that is, cracking and spalling, which is an important damage form of the bearing. Therefore, in order to improve the service life of the bearing, the bearing steel must have a high contact fatigue strength.

2. Wear resistance

When the bearing is working, not only rolling friction but also sliding friction occurs between the ring, the rolling element and the cage, so that the bearing parts are constantly worn. In order to increase the wear of bearing parts, maintain the accuracy and stability of the bearing, and extend the service life, the bearing steel should have good wear resistance.

3. Hardness

Hardness is one of the important qualities of bearing quality, and it has indirect effects on contact fatigue strength, wear resistance, and elastic limit. The hardness of bearing steel under operating conditions should reach HRC61~65, which can enable the bearing to achieve higher contact fatigue strength and wear resistance.

4. Anti-rust performance

In order to prevent bearing parts and finished products from being corroded and rusted during processing, storage and use, bearing steel is required to have good rust-proof properties.

5. Processing performance
In the production process of bearing parts, many cold and hot working processes are required. In order to meet the requirements of small quantity, high efficiency and high quality, bearing steel should have good processing performance. For example, cold and hot formability, machinability, hardenability, etc.

In addition to the above basic requirements, bearing steel should also meet the requirements of proper chemical composition, average external structure, less non-metallic impurities, compliance with specifications for external surface defects, and surface decarburization layers that do not exceed the specified concentration.