| 摘要 |
A nitrided steel member produced by forming an iron nitride compound layer on the surface of a steel member having a prescribed composition, wherein: when the surface of the nitrided steel member is measured by X-ray diffraction, the intensity ratio IFe4N(111)/{IFe4N(111) + IFe3N(111)} is 0.5 or more, IFe4N(111) referring to the X-ray diffraction peak intensity assignable to the (111) plane of Fe4N, and IFe3N(111) referring to the X-ray diffraction peak intensity assignable to the (111) plane of Fe3N; the Vickers hardness of the iron nitride compound layer is 900 or less; the Vickers hardness of the base metal at a point located immediately under the iron nitride compound layer is 700 or more; the difference between the Vickers hardness of the iron nitride compound layer and that of the base metal at the point is 150 or less; and the thickness of the iron nitride compound layer is 2 to 17μm. |
