| 摘要 |
An outer ring (21), an inner ring (22) and a roller (23) serving as a bearing component that adopts as a source material a steel ensuring a large fracture toughness value and also having an alloy element added thereto in a reduced amount and also provides sufficient wear resistance, are configured of a steel containing 0.15-0.3% by mass of carbon, 0.15-0.7% by mass of silicon, and 0.15-1.0% by mass of manganese, with a remainder of iron and an impurity, and have a raceway/rolling contact surface (21A, 22A, 23A) included in a region having a carbon enriched layer (21B, 22B, 23B) and a nitrogen enriched layer (21D, 22D, 23D). In the nitrogen enriched layer (21D, 22D, 23D) the raceway/rolling contact surface (21A, 22A, 23A) has a nitrogen concentration equal to or larger than 0.3% by mass. |
