PLATED STEEL SHEET FOR HOT PRESS FORMING HAVING EXCELLENT IMPACT PROPERTIES AFTER HOT PRESS FORMING, HOT PRESS FORMED MEMBER, AND MANUFACTURING METHODS THEREOF

摘要

The present invention provides: a plated steel sheet for hot press forming having excellent impact properties after hot press forming; a hot press formed member manufactured using the plated steel sheet for hot press forming; and manufacturing methods thereof. The plated steel sheet comprises: a base steel sheet containing, by weight, 0.15-0.4% of C, 0.1-1% of Si, 0.6-8% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, and 0.01-0.5% of Cr, with the remainder comprising Fe and miscellaneous impurities; and a plating layer formed on the surface of the base steel sheet and composed of zinc, aluminum, or an alloy containing zinc and aluminum, wherein the ratio (C S/C B) of the content (C S) of C in a surface layer to the content (C B) of C in the base steel sheet is 0.6 or less, and the ratio ((MnS+Cr S)/(MnB+Cr B)) of the total content (MnS+Cr S) of Mn and Cr in the surface layer to the total content (MnB+Cr B) of Mn and Cr in the base steel sheet is 0.8 or more.