What is bearing steel

Bearing steel is the steel used to make balls, rollers and bearing rings. Bearing steel has high and uniform hardness, wear resistance and high elastic limit. The requirements for the uniformity of chemical composition, the content and distribution of non-metallic inclusions and the distribution of carbides of bearing steel are very strict. It is one of the most stringent steels in all iron and steel production. In 1976, the international organization for Standardization ISO incorporated some general bearing steel grades into international standards and divided bearing steel into four categories: fully hardened bearing steel, surface hardened bearing steel, stainless bearing steel and high temperature bearing steel, with a total of 17 steel grades.