Bearing steel is used to make steel grades, rollers and bearing rings. Bearings are extremely pressure and friction at work, so the bearing steel is required to have high and uniform hardness and wear resistance, as well as high elastic limits. The uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict, and one of the most stringent steels required in all steel production.