| 摘要 |
It is desired to provide an infrared heating method of a steel sheet that can contribute to manufacture a steel sheet with a desirable characteristic distribution, and that can contribute to save labor in a steel sheet forming step and to simplify steel sheet forming facilities. The infrared heating method comprises the steps of: wholly infrared heating a steel sheet uniformly up to a temperature which is A3 point or above; and temperature distribution controlling, wherein, after the wholly infrared heating step, partial lowering of a light intensity of infrared rays irradiated toward the steel sheet is performed to provide a first region having a temperature of A3 point or above and a second region having a temperature less than A1 point in the steel sheet. |
