| 摘要 |
PROBLEM TO BE SOLVED: To suppress texture change type peeling due to immersion of hydrogen and surface origin type peeling based on existence of an impression, and to improve durability of a rolling bearing used under a severe environment while suppressing costs.SOLUTION: Surfaces of raceway surfaces of an outer ring raceway 5, inner ring raceways 6, 6 and the like are hardened by high-frequency hardening processing. A residual austenite amount of a surface layer part of each raceway 5, 6 is 12-40 vol.%, and hydrogen concentration in steel is 0.5 ppm or less. Surface origin type peeling is suppressed by securing the residual austenite amount, and texture change type peeling is suppressed by suppressing the hydrogen concentration in steel. |
