Often say 'bearing steel', what is the steel - bearing knowledge

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 production of bearing steel, carbon Wc is approximately 1%, chromium content Wcr to 1. Around 5%, since 1901 more than 100 years, the main composition is basic has not changed, with the progress of science and technology, the research work on, continuously improve product quality, accounting for over 80% of the total world bearing steel production. So that the bearing steel if no special instructions, 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, also can be used in the production of precision measuring tool, cold stamping dies, machine screw, such as punching die, measuring tool, tap and precision components of diesel engine oil pump. Bearing steel has high and even hardness and wear resistance, and high elastic limit. On the uniformity of the chemical composition of bearing steel, the content and distribution of non-metallic inclusions are very demanding, the distribution of the carbide, etc, are all steel production in one of the most demanding steel grade. In 1976, the international organization for standardization ISO incorporate the bearing steel grade of some common international standards, the bearing steel is divided into: the hardening type bearing steel, surface hardening type bearing steel, high temperature stainless bearing steel, bearing steel four categories, a total of 17 steel grade. Our country has been incorporated into the standard bearing steel classification method 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 with constraints on the corresponding national standard requirements.