The quality of bearing steel is the most demanding of all the alloy steel and steel grade of inspection items at most. The world recognized the level of bearing steel is a sign of a national level of metallurgy. Along with the rapid development of science and technology, the bearing steel use condition is bad, very demanding of the bearing is proposed. Due to different working environment, working conditions of bearing, in addition to a large number of production of high carbon chromium bearing steel, also developed the carburizing bearing steel, medium carbon steel bearing, stainless bearing steel, high temperature bearing steel and other steel series.
High carbon chromium bearing steel is a representative of the bearing steel, steel grade, states have dedicated to technical standards. In ISO/FDIS683-17, for example, the high carbon chromium bearing steel steel grade: are there cr6, 100, 100, 100 crmnsi6 crmnsi4-1-4, 100 crmnsi6-6, 100 crmo7 crmo7, 100-3, 100 crmo7-4, 100 crmnmosi8-4-6. In the United State