Patent ID: 6409846
Filing Date: 2002-06-25
Classification: F16C,Y10S

Abstract:
A rolling bearing comprising a fixed race, a rotary race and a plurality of rolling elements disposed between said fixed race and said rotary race;wherein at least said fixed race is made of a steel comprising from 0.35 to 0.55% by weight of C, from 11.0 to 17.0% by weight of Cr, from 0.05 to less than 0.22 by weight of N and the rest of Fe and unavoidable components, further wherein the sum of the content of C and N is from 0.45 to 0.65% by weight or less, and exhibits a surface hardness HRC of 57 or more after heat treatment and the diameter of eutectic carbide produced at least on said bearing rolling surface of the races is 10 &mgr;m or less, wherein said steel further comprises at least one of 3.0% by weight or less of Mo and 2.0% by weight or less of V, and wherein a thickness of a passive film is from 5 nm to 100 nm at least on said bearing rolling surface of the races.