| 摘要 |
<p>This steel for a machine structure contains, in mass %: C: 0.40% to less than 0.75%; Si: 0.01% to 3.0%; Mn: 0.1% to 1.8%; S: 0.001% to 0.1%; Al: more than 0.1% and not more than 1.0%; N: 0.001% to 0.02%; and P: limited to not more than 0.05%, with a balance including Fe and inevitable impurities, in which the steel 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> |
