STEEL SHEET FOR WARM PRESS FORMING, WARM PRESS FORMED PARTS AND METHOD FOR MANUFACTURING THEREOF

摘要

PURPOSE: A steel sheet for warm press forming, a warm press formed member, and a manufacturing method thereof are provided to apply super high strength steel for thermal treatment to an impact member by securing 800MPa or more of tensile strength and improving ductility.;CONSTITUTION: A steel sheet for warm press forming is composed of 0.01-0.5 wt.% of C, 3.0 wt.% or less of Si(not including 0), 3-15 wt.% of Mn, 0.0001-0.1 wt.% of P, 0.0001-0.03 wt.% of S, 3.0 wt.% or less of Al(not including 0), 0.03 wt.% or less of N, and the rest of Fe and inevitable impurities. The steel sheet is additionally composed of 0.001-2.0 wt.% of one or more among Cr, Mo, and W. The steel sheet is additionally composed of 0.001-0.4 wt.% of one or more among Ti, Nb, Zr, and V. The steel sheet is additionally composed of 0.005-2.0 wt.% of one or more among Cu and Ni.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Temperature; (BB) Time