Production manner null of the melting galvanized steel sheet for deep drawing which is superior in resistance hole open

摘要

PURPOSE: To produce a hot-dip galvanized steel sheet for deep drawing improved in deep drawability and pitting corrosion resistance. ;CONSTITUTION: A slab of a steel having a composition consisting of, by weight, ≤0.02% C, ≤1.5% Si, 0.05-1.8% Mn, 0.03-0.20% P, ≤0.015% S, 0.05-1.5% Cu, 0.005-0.100% solAl, ≤0.005% N, 0.005-0.15% Ti, further one or ≤2 kinds among 0.005-0.15% Nb, ≤1% Ni, ≤3% Mo, and ≤7% Cr, and the balance iron with inevitable impurities is hot-rolled, pickled, and cold-rolled. Subsequently, the resulting steel sheet is annealed at 700-950°C and galvanized by means of a continuous hot-dip galvanizing line or is iron-plated by means of a continuous electroplating line and then annealed at 700-950°C and galvanized by means of a continuous hot-dip galvanizing line.;COPYRIGHT: (C)1993,JPO&Japio