| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high strength steel sheet superior in warm forming property and superior in strength and ductibility after warm forming, and to provide a method of manufacturing the same. <P>SOLUTION: In the high strength steel sheet, a tensile strength at room temperature is 780 MPa or more, a yield stress in a heating temperature region of 400-700°C is 80% or less of the yield stress at room temperature, an entire elongation in the heating temperature region is 1.1 times or more of the entire elongation at room temperature, and a yield stress, after cooled from the heating temperature to room temperature after heated up to the heating temperature region and applied with a stress of 20% or less, is 70% or more of the yield stress at room temperature before heated, and the entire elongation, after cooled from the heating temperature to room temperature after heated up to the heating temperature region and applied with a stress of 20% or less, is 70% or more of the entire elongation at room temperature before heated. <P>COPYRIGHT: (C)2013,JPO&INPIT |
