METHOD FOR MANUFACTURING HOT STAMPED BODY HAVING VERTICAL WALL, AND HOT STAMPED BODY HAVING VERTICAL WALL

摘要

The present invention provides a method for manufacturing a hot stamped body having a vertical wall, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac 1 °C and lower than Ac 3 °C; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660°C at a cooling rate of equal to or less than 10 °C/s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550°C to 660°C for one minute to 10 minutes.