Anti-friction bearing and method for fabricating the same

摘要

A bearing and a method for fabricating the same are provided in which the bearing to be used for office automation equipment and the like is improved in impact resistance and load capacity so that its rotational accuracy will not deteriorate in long-term use and its quietness can be maintained over a long period of time. The bearing is an anti-friction bearing among bearings functioning by means of rolling movements between portions supporting a load and being in relative motion to each other, the anti-friction bearing having an outer ring of 30 mm or less in diameter, in which high carbon chromium bearing steel constituting the anti-friction bearing includes the following compositions: C of 0.90-1.30wt%, Si of 0.40-1.20wt%, Mn of 0.90-1.60wt%, and Cr of 0.90-1.70wt%. After quenching, the tempering temperature used for this bearing is maintained in the range of 170 DEG C and 250 DEG C so that the amount of retained austenite in the surface layer after heat treatment is stabilized at 6vol% or less.