GALVANIZED STEEL SHEET EXCELLENT IN HOT-PRESS FORMABILITY AND METHOD FOR PRODUCING HOT-PRESS FORMED MEMBER USING THIS SHEET, HOT-PRESS FORMED MEMBER EXCELLENT IN HIGH STRENGTH AND APPEARANCE

摘要

PROBLEM TO BE SOLVED: To provide a galvanized steel sheet excellent in hot-press formability used for producing a hot-press formed member having ≥ 980 MPa strength and excellent appearance.;SOLUTION: This galvanized steel sheet contains, by mass%, 0.05-0.4% C, ≤1.0% Si (no containing 0), 2.5-8% Mn and Ac₃ point shown in the following equation (1) is ≤800°C. Ac₃(°C)=910-203×[C]^1/2+44.7[Si]-30[Mn]-11[Cr]+31.5[Mo]-15.2[Ni]-20[Cu]: (1) (in the equation, [] is shown as mass% of each containing component).;COPYRIGHT: (C)2004,JPO&NCIPI