The main alloying 6200 ball bearing in high carbon bearing steel are carbon, chromium, silicon, manganese, vanadium and so on. There is an urgent need to develop good processing performance, low cost, and fatigue. The contact fatigue life of the bearing is very sensitive to the uniformity of the steel structure. Continuous spheroidizing annealing heat treatment technology is the development direction of bearing steel heat treatment. 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. GCr4 steel bearing adopts high temperature heating-surface quenching heat treatment process. The contact fatigue life L10 and L50 of GCr15SiMo are respectively 73% and 68% higher than that of GCr15SiMn. The spheroidization structure of bearing steel is stable and uniform, the decarburized layer is small, and the energy consumption is low.08% to 0. Under the same conditions, the service life of bearings made of G015SiMo steel is twice that of GCr15SiMo steel. Aiming at the weak point of low hardenability of GCr15SiMn steel, my country has developed high hardenability and hardenability bearing steel GCr15SiMo, its hardenability HRC≥60, hardenability J60≥25mm. At present, my country can control the minimum oxygen content in bearing steel to about 10ppm.
The oxygen content is reduced from 28ppm to 5ppm, and the fatigue life can be extended by an order of magnitude.20% to about 0. Bearing steels with long life and suitable for different purposes and uses, such as high-temperature carburizing steel M50NiL, easy-to-process stainless bearing steel 50X18M and ceramic bearing materials.Bearing steel is mainly used to manufacture rolling elements and rings of rolling bearings. Since the 1970s,
with the economic development and industrial technology progress, the application range of bearings has expanded; and the development of international trade has promoted the internationalization of bearing steel standards and the development and application of new technologies, new processes and new equipment. The structure of the bearing steel in use should be the tempered martensite matrix with fine carbide particles evenly distributed.
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