Cold-rolled, 980MPa Grade Sheet Steels with Excellent Elongation and A-value Characteristics

In recent years, ultra-high strength sheet steels have been increasingly used in automotive body parts to increase crash worthiness, and simultaneously decrease body weight (resulting in reduced gas emissions and improved environmental protection). In response to these requirements, Kobe Steel has developed several types of 980MPa grade cold-rolled sheet steels. This article describes the features of two kinds of newly developed 980MPa grade cold-rolled sheet steels. They are characterized by excellent formability characteristics with a superior balance between stretchability and stretch flangeability. These newly developed steels also exhibit satisfactory performance including weldability and phosphatability, which are required for practical applications.