| 摘要 |
<p>Provided is a steel for a mechanical structure, which comprises, by mass%, 0.40% to less than 0.75% of C, 0.01% to 3.0% of Si, 0.1% to 1.8% of Mn, 0.001% to 0.1% of S, greater than 0.1% to 1.0% of Al, 0.001% to 0.02% of N, no more than 0.05% of P, and residual Fe and inevitable impurities as the balance, and which satisfies 139.38=214×[C]+30.6×[Si]+42.8×[Mn]-14.7×[Al]=177 and 0.72=[C]+1/7×[Si]+1/5×[Mn]<1.539.</p> |
