| 摘要 |
There is provided a method for manufacturing a hot-press formed steel-member, the method being capable of reducing LME without causing cracking of a galvanized steel sheet. The method includes a step of using a galvanized steel sheet, a base steel thereof, having a prescribed chemical composition, a heating step of heating the galvanized steel sheet to not lower than an Ac 3 transformation-point, and a hot-press forming step of executing hot-press forming at least twice after the heating step. Furthermore, every hot-press forming in the hot-press forming step is executed in such a way as to satisfy the following expression (1) R / t > ˆš �¢ a ‹ T - b
where "R" is a curvature radius (mm) of a shoulder of a tool used in the hot-press forming, "t" is a thickness (mm) of the galvanized steel sheet, "T" is a forming-start temperature (°C) of the hot-press forming, "a" is a constant 0.2984, and "b" is a constant 590. |
