摘要:
This invention relates to a quenchable steel sheet having hot press workability and a method of manufacturing the same. The quenchable steel sheet has an alloy composition including carbon (C) in an amount of 0.15 ∼ 0.30 wt%, silicon (Si) in an amount of 0.05 ∼ 0.5 wt%, manganese (Mn) in an amount of 1.0 ∼ 2.0 wt%, boron (B) in an amount of 0.0005 ∼ 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 ∼ 0.0040 wt% and copper (Cu) in an amount of 0.05 - 1.0 wt%, two or more selected from among cobalt (Co), zirconium (Zr) and antimony (Sb), and iron (Fe) and other inevitable impurities, in which alloy elements are controlled to increase hot ductility and enabling pressing at 600 - 900°C, so that a plating layer is protected and a tensile strength of 1400 MPa or more and an elongation of 8% or more are obtained after pressing.