| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing component capable of reconciling improvement of durability with improvement of dimension stability.SOLUTION: Bearing components (an outer ring 11, an inner ring 12 and a ball 13) comprise: a steel containing 0.95 mass% or more and 1.10 mass% or less carbon; 0.35 mass% or less silicon; 0.50 mass% or less manganese; 1.30 mass% or more and 2.00 mass% or less chromium; and residual impurities, and a carbonitriding layer is formed on a surface layer part including traveling surfaces (an outer ring traveling surface 11A, an inner ring traveling surface 12A) or a rolling surface 13A. The area ratio of a deposit in a region where the carbonitriding layer is not formed is 7% or less. The amount of retained austenite in the surface layer part is 20 vol% or more and 35 vol% or less, and the average amount of retained austenite in the whole bearing components (the outer ring 11, the inner ring 12 and the ball 13) is 18 vol% or less. |
