HIGH STRENGTH STEEL SHEET FOR WORKING EXCELLENT IN CONTINUOUS SPOTTABILITY IN SPOT WELDING, PLATED STEEL SHEET AND PRODUCTION THEREOF

摘要

PURPOSE: To improve the spot weldability in a Cu-contg. high strength steel sheet for working, particularly, in continuous spottability. ;CONSTITUTION: The objective high strength steel sheet excellent in continuous spottability in spot welding contains, by weight, ≤0.05% C, ≤2.0% Si, ≤3.0% Mn, ≤3.0% Ni, 0.0002 to 0.0080% B, 0.05 to 3.0% Cu, 0.002 to 0.100% Al, ≤0.3% P, ≤0.005% S and ≤0.010% N and furthermore contains one or two kinds of 0.002 to 0.30% Ti and 0.002 to 0.20% Nb and 0.005 to 0.015% of one or two kinds selected from Sb, As and Sn, and the balance Fe with inevitable impurities.;COPYRIGHT: (C)1993,JPO&Japio