PRODUCTION OF CORROSION RESISTANT STEEL SHEET EXCELLENT IN CHEMICAL CONVERTIBILITY AND COLD ROLLED STEEL SHEET THEREFROM

摘要

PURPOSE: To provide a method for producing a steel sheet excellent in both of chemical convertibility and corrosion resistance without executing special surface modifying and to provide a method for producing a cold rolled steel sheet therefrom. ;CONSTITUTION: This corrosion resistant steel sheet has a chemical componental compsn. contg., by weight, 0.0003 to 0.005% C, ≤0.1% Si, 0.1 to 2.0% Mn, 0.002 to 0.03% P, 0.003 to 0.020% S, 0.01 to 0.1% sol.Al, 0.05 to 0.5% Cu, ≤0.10% Cr (contg. the case of no addition) and 0.0002 to 0.0020% B and furthermore satisfying 24×S/32+2×P/31≥Cu/63≥2×S/32. The surface of this steel sheet is moreover provided with an oxidized film having 10 to 100Å thickness. In the production of the cold rooled steel sheet, annealing is executed at ≥500°C for ≤10min.;COPYRIGHT: (C)1996,JPO