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Abstract

The quenchable steel sheet has an alloy composition including carbon (C) in an amount of 0.15 to 0.30 wt %, silicon (Si) in an amount of 0.05 to 0.5 wt %, manganese (Mn) in an amount of 1.0 to 2.0 wt %, boron (B) in an amount of 0.0005 to 0.0040 wt %, sulfur (S) in an amount of 0.003 wt % or less, phosphorus (P) in an amount of 0.012 wt % or less, one or more selected from among calcium (Ca) in an amount of 0.0010 to 0.0040 wt % and copper (Cu) in an amount of 0.05 to 1.0 wt %, two or more selected from among cobalt (Co), zirconium (Zr) and antimony (Sb), and iron (Fe). Alloy elements are controlled to increasing hot ductility and enabling pressing at 600 to 900° C. so that a tensile strength of 1400 MPa or more and an elongation of 8% or more are obtained after pressing.

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First Claim