Patent ID: 8118953

Claim:
A method for producing a steel part having a long rolling contact fatigue life, comprising: hot-working steel, spheroidizing annealing the steel by maintaining the steel at about 800° C. to about 850° C. for about 5 hours or more, cooling the steel to about 700° C. or less at a rate of about 0.01° C./s or less, and hardening and tempering the steel, wherein the steel has a composition comprising: C: about 0.7% by mass to about 1.1% by mass; Si: about 0.5% by mass to about 2.0% by mass; Mn: about 0.4% by mass to about 2.5% by mass; Cr: about 1.6% by mass to about 5.0% by mass; Mo: about 0.1% by mass to less than about 0.5% by mass; Al: about 0.010% by mass to 0.050% by mass; less than about 0.0015% by mass of Sb as an impurity, and the balance composed of Fe and inevitable impurities.