AUSTENITIC STAINLESS STEEL FOR EXHAUST MANIFOLD

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PROBLEM TO BE SOLVED : To provide stainless steel having excellent scale peeling resistance in long term repeated use at 1, 000 to 1, 050°C and suitable for an exhaust manifold inner tube. SOLUTION : The austenitic stainless steel for an exhaust manifold has a composition comprising, by mass, ≤0.15% C, 1 to 3% Si, ≤2% Mn, ≤0.04% P, ≤0.01% S, >12 to 20% Ni, >22 to 25% Cr, ≤0.15% N and >0.5 to 2.0% Al, and, if required, further comprising one or more kinds selected from 0.05 to 0.5% Nb, 0.05 to 0.5% Ti, 0.05 to 0.5% Mo, 0.05 to 0.5% Cu, 0.05 to 0.5% V, 0.05 to 0.5% W and 0.05 to 0.5% Zr, or further comprising rare earth metals, Y and Ca by 0.005 to 0.1% in total, and the balance Fe with inevitable impurities, and also satisfying inequality (1) : Cr+0.5Si+3Al≥26 (1). COPYRIGHT : (C)2006, JPO&NCIPI