Chemical composition and characteristics of GCr15 bearing steel

The chemical composition in bearing steel is mainly carbon, chromium, silicon, manganese, nickel, molybdenum, vanadium, etc. A carbon besides carburizing steel, the influence of the carbon content of general bearing steel in 0. 95 - 1. 15%, belong to hypereutectoid composition. After quenching and low temperature tempering can get high hardness, high contact fatigue strength and wear resistance. In order to form carbide enough to increase wear resistance, carbon content can't too low, but high carbon content will increase the inhomogeneity of carbide and will form the carbide network caused the reduction of mechanical performance. B the effect of alloy element chromium bearing steel is the main chemical composition, chromium could improve the hardenability, reduce overheating tendency, enhances the stability of low temperature tempering. Silicon and manganese in bearing steel mainly improve the hardenability. Nickel in carburizing bearing steel can improve the toughness of the steel and plastic, nickel on fatigue resistance and reduce steel can improve steel on the sensitivity of the gap. Molybdenum in steel can improve the hardenability and hot strong sex, prevent the temper brittleness, increase in some medium corrosion resistance. Vanadium bearing steel in improving strength and yield ratio, especially improve the proportional limit and the elastic limit, reduce decarburization sensitivity when heat treatment, so as to improve the surface quality, no chrome vanadium bearing steel, carbide dispersion degree is high, the use of good performance.