Bearing material

Characteristics of bearing steel: 1. Contact fatigue strength Bearings are exposed to fatigue damage easily under contact load, that is, cracks and spalling, which is an important situation of bearing damage. Therefore, in order to improve the service life of the bearing, the bearing steel must have high contact fatigue strength. Second, wear resistance During bearing tasks, not only rolling friction occurs between the ferrule, rolling body and the cage, but also sliding friction, so that the bearing parts are constantly worn. In order to increase the wear of the 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, which has an indirect effect on contact fatigue strength, wear resistance and elastic limit.

The hardness of the bearing steel under the application conditions must reach HRC61 ~ 65 individually, the ability to make the bearing achieve higher contact fatigue strength and wear resistance. Fourth, anti-rust performance In order to prevent bearing parts and finished products from being rusted and rusted during processing, storage and use, bearing steel should be required to have good anti-rust performance. Fifth, processing performance During the consumption process of bearing parts, there are many cold and hot processing procedures. In order to satisfy the requirements of small amount, high efficiency and high quality, bearing steel should have good processing performance. For example, cold and hot forming properties, cutting performance, hardenability, etc. In addition to the above basic requirements, bearing steel should also reach requirements such as appropriate chemical composition, average external organization, few non-metallic inclusions, external appearance defects conforming to specifications, and external decarburization layers not exceeding the regular concentration.

wheel unit bearing