The basic requirements of the material of the rolling bearing steel ball depend to a large extent on the working performance of the bearing. Choosing the right material for the rolling bearing will have a major impact on its performance and longevity. In general, the main failure modes of rolling bearings are fatigue spalling under alternating stress and loss of bearing accuracy due to frictional wear. In addition, there are cracks, indentations, rust and other causes of abnormal damage to the bearing. Therefore, the rolling bearing should have high resistance to plastic deformation, less friction and wear, good rotation accuracy, good dimensional accuracy and stability, and long contact fatigue life. And many of these properties are determined by the combination of materials and heat treatment processes.
When the bearing steel ball is working normally, in addition to rolling friction, it is accompanied by sliding friction. The main parts of the sliding friction are: the contact surface between the rolling element and the raceway, the contact surface between the rolling element and the cage pocket, the retainer and the ferrule guide rib, and the roller end face and the ferrule guide Wait between the ribs. The presence of sliding friction in rolling bearings inevitably causes wear on the bearing components. If the wear resistance of the bearing steel is poor, the rolling bearing will lose precision prematurely due to wear or the bearing vibration will increase and the life will be reduced due to the decrease in the rotation accuracy. Therefore, bearing steels are required to have high wear resistance.