To provide a method of manufacturing a steel shaft by which the fatigue strength of the entire steel shaft can be enhanced by releasing the residual tensile stress in the shaft while maintaining the surface strength of the steel shaft subjected to the induction hardening.
The method of manufacturing the steel shaft comprises the steps of: performing the induction hardening of the steel shaft 1 for use in, for example, a crank shaft, a transmission shaft, and a spline; performing the tempering of the shaft 1 after the induction hardening in the temperature zone from >200°C to 300°C; and performing the shot peening of the shaft 1 after the tempering, wherein the hardening depth of the induction hardening is ≤50% of the radius of the shaft 1.
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Masaaki Utsunomiya
Atsushi Watanabe