| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot stamp molded body capable of process after hot stamp, useful as an impact absorption member for energy absorption, having high strength and capable of reducing weight of automobile bodies.SOLUTION: Hot stamp molded body has a composition containing, by mass%, C:0.07% to 0.13%, Si:0.01% to 1.5%, Mn:1.5% to 3.0%, P:0.001% to 0.06%, S:0.001% to 0.01%, N:0.0005% to 0.01%, Al:0.001% to 0.05% and the balance Fe with inevitable impurities, satisfies the following formula (1) where [C], [Si], [Mn], [Cu], [Ni], [Cr], [Mo], [V] and [B] are the C content, the Si content, the Mn content, the Cu content, the Ni content, the Cr content, the Mo content, the V content and the B content respectively and contains martensite having a metallographic structure after hot stamp of 90% by area ratio. [Formula 1][C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5[B]≥0.15 (1) |
