Often say 'bearing steel', what is the steel

What is the bearing steel bearing steel is also called high carbon chrome steel, carbon content Wc is approximately 1%, Wcr chromium content is 0. 5% - 1. 65%. High carbon chromium bearing steel GCr15 is the world's largest bearing steel consumption, carbon Wc is approximately 1%, chromium content Wcr to 1. Around 5%, born from 1901 to date more than 100 years, main ingredients, no changes with the progress of science and technology, the research work on, progress from time to time, yield and quality of bearing steel by more than 80% of the total consumption of the world. So that the bearing steel if no special clarify, that means GCr15. The application and classification of bearing steel bearing steel is used in the manufacture of ball bearing, roller bearing ring and steel grade, can also be used in the manufacture of precision measuring tool, cold stamping dies, machine screw, such as punching die, measuring tool, tap and fine diesel engine oil pump parts. Bearing steel is high and the average hardness and wear resistance, and high elastic limit. On the average of the chemical composition of bearing steel, non-metallic inclusion content and distribute, the distribution of carbide and other request is very strict, in all the steel consumption is one of the most severe steel request. In 1976, the international organization for standardization ISO will be some general bearing steel grade in international norms, the bearing steel is divided into: the hardening type bearing steel, bearing steel, appearance sclerosis type, high temperature stainless bearing steel, bearing steel four categories, a total of 17 steel grade. Our country has been classified as specification of bearing steel classification method is similar to ISO, correspond to high carbon chromium bearing steel, carburized bearing steel, corrosion resistant stainless bearing steel, high temperature bearing steel four categories. This several different bearing steel, respectively corresponding to the kingdom of specification request stop constraints.