Application of ultra high-strength steel sheets for automotive body parts

In recent years, in order to increase automotive fuel mileage through the reduction of automotive body weight and the performance of safety in impacts, ultra high-strength steel sheets rather than TS 980 MPa grade steels have been increasingly applied to automotive body parts. This paper surveys TS 980 MPa grade cold-rolled steel sheets and describes a few mechanical properties of the newly developed steel sheets for automotive seats. Due to improvements in the homogeneity of the microstructure, the developed steel sheets have much better bending formability.