Patent ID: 6531000
Filing Date: 2003-03-11
Classification: C21D,C22C,C23C,F16C,Y10T

Abstract:
A method of manufacturing a rolling bearing in which a plurality of rolling elements are arranged between bearing rings comprising a fixed ring and a rotational ring, wherein the method comprises a step of applying a hardening treatment to at least one member of the bearing rings or the rolling elements and then applying a tempering treatment at a temperature within a range from 240 to 320Â° C. and a step of re-heating the tempered member in air at a temperature lower by 30Â° C. or more than said tempering temperature, thereby forming an oxide layer comprising an iron/chromium oxide to a thickness of from 1 to 1000 nm on the surface of the member and making the surface hardness to Hv 650 or higher.