FERRITIC STAINLESS STEEL FOR SEPARATOR OF SOLID OXIDE FUEL CELL

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PROBLEM TO BE SOLVED : To provide a ferritic stainless steel for the separator of a solid oxide fuel cell, which presents excellent oxidation resistance in a high-temperature atmosphere containing a large amount of steam, has adequate electroconductivity and is inexpensive. SOLUTION : The ferritic stainless steel has a composition comprising 0.03 mass% or less C, 1.0 mass% or less Si, 1.5 mass% or less Mn, 0.01 mass% or less S, 0.03% or less N, 11.0 to 20.0 mass% Cr, further one or more elements among 3.0 mass% or less Mo, 1.5 mass% or less Cu, 0.05 to 0.80 mass% Nb, 0.03 to 0.50 mass% Ti, 0.001 to 0.1 mass% Y, 0.001 to 0.1 mass% rare earth elements and 0.001 to 0.01 mass% Ca, as needed, and the balance substantially Fe; and has a mechanically polished surface with a surface roughness Ra of 0.05 to 50 μm measured by JIS B0601 through mechanical polishing. COPYRIGHT : (C)2009, JPO&INPIT