| 摘要 |
A soft nitrided induction hardened steel part which is excellent in bearing fatigue strength comprised of a predetermined chemical composition wherein a dissolved N concentration from the surface to 0.2 mm depth is 0.05 to 1.50%, a Vicker's hardness from the surface to 0.2 mm depth after tempering at 300°C is Hv600 or more, and t/r‰¤0.35 when an effective hardened layer depth "t" is 0.5 mm or more and a radius of a breakage risk site or half of the thickness is "r" (mm). |
