| 摘要 |
A gear having a high fatigue strength can be produced relatively inexpensively. The gear is produced by plastic working using a steel material containing C</=0.01 wt %, Si</=1 wt %, 0.05 wt %</=Mn</=0.5 wt %, P</=0.1 wt %, S</=0.03 wt %, 0.02 wt %</=sol.Al</=0.1 wt %, 0.8 wt %</=Cu</=1.7 wt %, and 0.02 wt %</=Ti</=0.1 wt %, the balance being Fe and inevitable elements. The gear is subjected to soft nitriding, serving as artificial aging, after a solution treatment. The resulting gear has a sufficiently deep, surface hardened layer. Further, the gear may be produced inexpensively since the simultaneous performance of the artificial aging and soft nitriding saves energy.
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