Ultra-high strength steel-sheets have been used increasingly for automotive body parts to improve crash worthiness while reducing body weight so as to decrease gas emissions for environmental protection. In response to these trends, Kobe Steel has developed several types of 980MPa grade cold-rolled steel-sheets. This article describes the features of two, newly developed, 980MPa grade cold-rolled steels. They are featured by excellent formability due to a superior balance between stretchability and stretch-flangeability. These newly developed steels also exhibit satisfactory performance, such as weldability and phosphatability, required for practical applications.
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