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The service life and reliability of rolling bearings and bearing a large extent with the metallurgical quality of steel is closely related to the. Due to the characteristics of the bearing steel, metallurgical quality requirements than the general industrial use of steel to be more strict.
1 chemical composition of strict requirements
General rolling bearing steel is mainly of high carbon chromium bearing steel, carbon content of about 1%, adding about 1.5% chromium, hypereutectoid steels containing manganese, silicon and small amounts of. Only strict control of chemical composition of bearing steel, can wait to meet and hardness of bearing performance of organizations through the process of heat treatment.
2 high size precision
For the rolling bearing steel steel high dimensional accuracy requirements, this is because most bearing parts must pass through the pressure molding. In order to save material and improve labor productivity, the vast majority of bearing rings are after forging forming, cold heading steel ball after hot forging or molding roller small size is after cold forging steel, if the dimension precision is not high, the calculation is not precise blanking size and weight bearing parts, can not guarantee the quality of products, easy to cause the design
Preparation and mold damage.