| 摘要 |
The present invention relates to a hollow shaft molded of a material only for a steel tube capable of fine grains during high-frequency heat treatment after processing; and to a manufacturing method thereof. Disclosed are a hollow shaft and a manufacturing method thereof, and the hollow shaft comprising: 0.35-0.55 wt% of C; 0.3-0.5 wt% of Si; 0.35-0.6 wt% of Mn; 0.02 wt% or less (exclusive of 0) of P; 0.02 wt% or less (exclusive of 0) of S; 0.2 wt% or less (exclusive of 0) of Cu; 0.25 wt% or less (exclusive of 0) of Ni; 0.25 wt% or less (exclusive of 0) of Cr; 0.35-0.45 wt% of Mo; 0.015-0.035 wt% of V; 0.025-0.045 wt% of Al; 0.025 wt% or less (exclusive of 0) of Ti; 0.001-0.003 wt% of B; and the remainder consisting of Fe and inevitable impurities. |
