WEAR-AND FRACTURE-RESISTANT STEEL

摘要

Roller bearing steel and method for the production of a part for a rolling structure. The ball bearing steel contains 0.37 - 0.46 % by wt. C, 0.1 - 0.3 % by wt. Si, 0.7 - 1.3 % by wt. Cr, 0.60 - 1.2 % by wt. Mn, 0.15 - 0.30 % by wt. Mo and also Fe and usual impurities. After carburising/carbonitriding a further heat treatment (re-hardening) takes place after the initial quenching, which further heat treatment is followed by quenching once again and tempering, martensite with a dispersion of hard carbides being formed at the surface.