HOT PRESS-FORMING METHOD FOR STEEL SHEETS, HOT PRESS-FORMING DEVICE FOR STEEL SHEETS, AND STEEL FORMED MEMBER

摘要

Before hot press-forming a flat plated steel sheet (K) that has been uniformly heated to a temperature equal to or greater than an A1 transformation point, a partial rapid cooling stage (11) rapidly cools a prescribed region of the plated steel sheet (K) to a temperature equal to or less than the martensite start (Ms) temperature, and then the rapidly cooled region of the plated steel sheet (K) is reheated to a temperature greater than the martensite start (Ms) temperature. After the plated steel sheet (K) is reheated, a forming/rapid-cooling stage (13) simultaneously forms the plated steel sheet (K) and rapidly cools same to a temperature equal to or less than the martensite finish (Mf) temperature.