FERRITIC STAINLESS STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AGAINST SULFURIC ACID, AND METHOD FOR PRODUCTION THEREOF

摘要

A ferritic stainless steel sheet having a superior sulfate corrosion resistance even in a high-temperature atmosphere or having a low degree of rough surface at a bent part formed by a bending work performed at an angle of 90° or more is provided. In particular, a ferritic stainless steel sheet is provided which includes a composition containing 0.02 mass percent or less of C, 0.05 to 0.8 mass percent of Si, 0.5 mass percent or less of Mn, 0.04 mass percent or less of P, 0.010 mass percent or less of S, 0.10 mass percent or less of Al, 20 to 24 mass percent of Cr, 0.3 to 0.8 mass percent of Cu, 0.5 mass percent or less of Ni, 0.20 to 0.55 mass percent of Nb, 0.02 mass percent or less of N, and the balance being Fe and inevitable impurities; and a structure in which the maximum grain diameter of inclusions containing S is 5 µm or less.