To provide a method for linearly heating a steel sheet, which method can stably achieve a large deformation angle.
The method for linearly heating the steel sheet is used for heating the steel sheet so as to simultaneously satisfy both of the following conditions: 700≤Ts≤1,000; and 27×(IYS/1,000)0.7×t-0.32-30≤Tr≤27×(IYS/1,000)0.7×t-0.32+30, where Ts(°C) shows a maximum arrival temperature on the right side surface of the steel sheet in the linear heating; Tr(°C) shows a maximum arrival temperature on the back surface of the steel sheet in the linear heating; IYS(K N/mm2) shows an integrated value of the yield strength of the steel sheet with respect to temperature from an ordinary temperature to 600°C; and t(mm) shows the thickness of the steel sheet.
KASUYA TADASHI
SHISHIBORI AKIRA
Mizuno Katsufumi
Hiroshin Takano