STEEL FOR SOLID-OXIDE FUEL CELL SEPARATOR

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PROBLEM TO BE SOLVED : To provide steel for a solid-oxide fuel cell separator on which an oxide film having satisfactory electric conductivity at about 700 to 950°C is formed and which has satisfactory oxidation resistance particularly even in use at a high temperature for a long period of time. SOLUTION : The steel for a solid-oxide fuel cell separator has a composition which is composed of, by mass, ≤0.1% C, <0.2% (not including 0%) Si, 0.1 to 1.0% Mn, 17 to 26% Cr, ≤2% Ni, 0.01 to 0.8% Zr, one or more kinds among 0.01 to 0.3% Y and 0.005 to 0.2% rare earth elements (REM) and the balance essentially Fe and in which Al is controlled to ≤0.08% and further, as inevitable impurities, the contents of S, O, N and B are limited to ≤0.015%, ≤0.010%, ≤0.040% and ≤0.0030%, respectively, and also the following expression is satisfied : (O)/(0.028Si+0.003Mn+0.024Al+0.023Zr+0.14Y+0.08REM)≤1.0 ...(1). COPYRIGHT : (C)2007, JPO&INPIT