Bearing steels are classified into high-carbon chromium bearing steels, carburized bearing steels, high-temperature bearing steels, stainless bearing steels and special special bearing materials according to their characteristics and application environment.20% to about 0. Through controlled rolling or rapid cooling after rolling, the network carbide is eliminated, and a suitable preliminary structure is obtained, which can shorten the spheroidizing annealing time of the bearing steel, refine the carbide, and improve the fatigue life. According to the survey of experts on the bearing trading network, in recent years, Russia and Japan have adopted low-temperature controlled rolling (800℃～850℃).08% to 0. How to obtain the spheroidization structure is an important issue in the production of bearing steel, and controlled rolling and cooling is an important production process of advanced bearing steel. Various countries China Mechanical ball bearing are researching and developing new bearing steels, expanding applications and replacing traditional bearing steels. In the future, bearing steel will mainly develop in two directions: high cleanliness and diversified performance. At present, my country can control the minimum oxygen content in bearing steel at about 10 ppm. Therefore, it is possible to replace high temperature processing with 650°C temperature processing and combine it with the spheroidizing annealing process, which is of great significance for simplifying equipment and procedures, saving energy, and improving quality. In order to meet the above performance requirements, strict requirements are imposed on the uniformity of the chemical composition of the bearing steel, the content and type of non-metallic inclusions, the size and distribution of carbides, and the decarburization. The spheroidization structure of bearing steel is stable and uniform, the decarburized layer is small, and the energy consumption is low. The smelting of large quantities of bearing steel has been smelted by electric arc furnaces and developed into various types of primary furnaces plus external refining. In recent years, my country has also developed GCr4 bearing steel that can save energy, resources and impact resistance
