近几年来,随着地球环境保护的需求,汽车为了减少CO2的排放量通过采用薄板来达到轻量化,但同时为了提高车辆冲撞时的安全性而提高了汽车板的强度。其中,为了保护乘客的安全,车舱需要即便发生冲撞也不变形的高强度钢板,从而车舱周围开始广泛应用抗拉强度(TS)为980 MPa级以上 In recent years, with the demand for the protection of the earth’s environment, automobiles have been reduced in weight by using thin plates to reduce their emissions of carbon dioxide, but at the same time, the strength of automobile panels has been raised in order to improve the safety during vehicle collision. Among them, in order to protect the safety of passengers, the cabin requires high-strength steel plates that are not deformed even in the event of a collision, so that the tensile strength (TS)