The aluminum or the aluminum - galvanized sheet iron and its production methodological null mass which are suited for hot formation and become high intensity after

摘要

PROBLEM TO BE SOLVED: To provide an aluminum plated steel sheet or an aluminum - zinc plated steel sheet which is suitable for high temperature forming, and has high strength after high temperature forming, and to provide a production method therefor.;SOLUTION: The aluminum plated steel sheet or aluminum - zinc plated steel sheet suitable for high temperature forming and having high strength after high temperature forming has a composition containing, by mass, 0.15 to 0.55% C, ≤0.5% Si, 0.2 to 3.0% Mn, ≤0.04% S, ≤0.1% P and 0.005 to 0.100% Al, and further containing one or more metals selected from ≤2.0% Cr and ≤1.0% Mo so as to satisfy (Cr+7×Mo)≥0.1.;COPYRIGHT: (C)2003,JPO