HIGHLY CORROSION-RESISTANT COLD-ROLLED FERRITE STAINLESS STEEL SHEET HAVING EXCELLENT TOUGHNESS, AND PROCESS FOR PRODUCTION THEREOF

摘要

Disclosed are: a highly corrosion-resistant cold-rolled ferrite stainless steel sheet having excellent toughness, which is characterized by having a Charpy impact value of 100 J/cm2 or more at -50°C when the ferrite stainless steel sheet has a thickness of 4 mm; and a process for producing the ferrite stainless steel sheet. Specifically disclosed is a highly corrosion-resistant cold-rolled ferrite stainless steel sheet having excellent toughness, which is characterized by comprising (in mass%) 0.020% or less of C, 1.0% or less of Si, 1.0% or less of Mn, 0.06% or less of P, 0.01% or less of S, 18.0-24.0% of Cr, 0.3% or less of Mo, 0.015% or less of Ti, 0.20-0.40% of Al, 0.020% or less of N, Nb in such an amount that the following formula: 10 × (C+N) = Nb = 0.40% is fulfilled, and Fe and unavoidable impurities which make up the remainder, wherein the contents of the components meet the formula (A). Ti × N = 8.00 × 10-5 (A).