Focus on the Bearing Industry for 20 Years!
Under the action of periodic load, the contact surface of bearing is prone to fatigue failure, that is, cracking and peeling, which is the main damage form of bearing. Therefore, in order to improve the service life of bearing, bearing steel must have high contact fatigue strength.
When the bearing works, not only rolling friction but also sliding friction will occur between the ring, rolling element and cage, so that the bearing parts are constantly worn. In order to reduce the wear of bearing parts, maintain the accuracy and stability of bearing and prolong the service life, bearing steel should have good wear resistance.
Hardness is one of the important qualities of bearing quality, which has a direct impact on contact fatigue strength, wear resistance and elastic limit. The hardness of bearing steel in service should generally reach HRC61 ~ 65 in order to obtain high contact fatigue strength and wear resistance.
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 antirust performance.
In the production process, bearing parts have to go through many cold and hot working procedures. In order to meet the requirements of mass production, high efficiency and high quality, bearing steel should have good processing properties. For example, cold and hot forming performance, cutting performance, hardenability, etc.
In addition to the above basic requirements, bearing steel should also meet the requirements of appropriate chemical composition, uniform internal structure, less non-metallic inclusions, internal surface defects meeting the standard and surface decarburization layer not exceeding the specified concentration. These items are clearly specified in the raw material standards.