1. Contact fatigue strength
Under the action of periodic load, the bearing is prone to fatigue damage when contacting the surface, that is, cracks and peeling appear, which is an important damage situation 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
In the bearing task, not only rolling friction occurs between the ring, rolling element and the cage, but also sliding friction occurs, 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 has an indirect influence on contact fatigue strength, wear resistance, and elastic limit. The hardness of bearing steel under operating conditions must reach HRC61~65, which enables 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, it is requested that the bearing steel should have good rust resistance.

5. processing performance
In the production process, bearing parts have to go through many cold and hot processing procedures. In order to satisfy the small quantity, high efficiency, and high quality requirements, the bearing steel should have good processing performance. For example, cold and hot forming performance, cutting performance, hardenability and so on.
In addition to the above-mentioned basic requirements, bearing steel should also meet the requirements of proper chemical composition, average external structure, less non-metallic inclusions, external appearance defects conforming to specifications, and external surface decarburization layer not exceeding the regular concentrati