Formability and Weldability of Zn Coated Steel Sheet for Hot-stamping

Abstract

Zinc coated steel sheet that doesn't need de-scaling treatment in hot-stamping process was developed. We investigated its formability and weldability. The developed steel sheet had less friction resistance and better unti-galling properties than that of uncoated steel sheet because the oxide scale doesn't occur. As a result, the developed steel sheet exhibited better hat-channel drawability in hot stamping. Also, the mechanical properties of spot welded joint of hotstamped developed steel sheet are similar to that of de-scaled uncoated hot-stamped steel sheet. Moreover, the developed steel sheet had good consecutive spot weldability and low delayed failure sensitivity of spot welds.