Patent ID: 6312536
Filing Date: 2001-11-06
Classification: C21D,C22C,C23C,Y10T

Abstract:
A hot-dip galvanized steel sheet comprising a base steel sheet and a layer of hot-dip galvanizing formed thereon, the base steel sheet having a chemical composition comprisingC: 0.02-0.20 mass %,Mn: 1.5-2.40 mass %,Cr: 0.03-1.50 mass %,Mo: 0.03-1.50 mass %,3Mn+6Cr+Mo: no more than 8.1 mass %,Mn+6Cr+10Mo: no less than 3.5 mass %,Al: 0.010-0.150 mass %,Ti: 0.01 mass % or less,Si: 0.04 mass % or less,P: 0.060 mass % or less,S: 0.030 mass % or less, andFe as the principal component, whereinthe base steel sheet has a composite microstructure that includes mainly ferrite and martensite.