A method for warm forming a tension spring steel sheets, which is highly

摘要

This is a method for the warm forming of a highly tensile steel sheet, which discloses. The method can improve the productivity and at the same time the correct strength by ensuring the thermal structure resistance and dimensional stability during the heating phase and shaping of the highest tensile steel sheet which is maintained. In accordance with an exemplary embodiment of the present invention, the method for warm forming of a highly tensile steel sheet, which is of a: heating a steel sheet, which has a single-phase structure, to the a1 - transition temperature or below; pressing the into a predetermined shape to be reshaped into a mold heated steel sheet; and lifting and cooling of the pressed steel sheet.