Patent ID: 6306527
Filing Date: 2001-10-23
Classification: C21D,C23C,Y10S,Y10T

Abstract:
A hot-dip galvanized steel sheet which is produced from a cold-rolled steel sheet, as a base steel sheet, consisting essentially of:C: 0.010-0.06 wt %,Si: no more than 0.5 wt %,Mn: no less than 0.5 wt % and less than 2.0 wt %,P: no more than 0.20 wt %,S: no more than 0.01 wt %,Al: 0.005-0.10 wt %,N: no more than 0.005 wt %,Cr no more than 1.0 wt %,Mn+1.3Cr: 1.9-2.3 wt %,Fe: remainderand having a structure composed of ferrite and a second phase containing martensite, said second phase in the structure accounting for no more than 20% in terms of area and martensite in the second phase accounting for no less than 50% (in terms of area), and which has a zinc-plated layer formed on the surface thereof by hot-dip galvanizing or hot-dip galvannealing.