STEEL WITH EXCELLENT SULFURIC-ACID DEW-POINT CORROSION RESISTANCE, HIGH-TEMPERATURE OXIDATION RESISTANCE AND HIGH-TEMPERATURE STRENGTH

摘要

PROBLEM TO BE SOLVED: To provide a steel product having excellent high-temperature strength and high-temperature oxidation resistance in a high-temperature environment higher than the dew point of sulfuric acid and also having excellent sulfuric acid resistance.;SOLUTION: The steel with excellent sulfuric-acid dew-point corrosion resistance, high-temperature oxidation resistance and high-temperature strength has a composition containing, by mass, 0.0005 to 0.15% C, 0.1 to 3.5% Si, 0.05 to 1.0% Cu, 0.03 to 0.30% Sb, 0.1 to 1.0% Mn, 0.005 to 0.10% Al, 0.01 to 0.30% Ti and 0.0010 to 0.0100% B, properly containing ≤0.05% P, ≤0.05% S and ≤0.015% N, further containing one or more kinds among 0.01 to 1.0% Mo, 0.005 to 0.1% Nb, 0.005 to 0.2% V, ≤1.0% Cr, ≤0.5% Ni and 0.01 to 0.20% Sn and having the balance Fe with accompanying components and/or inevitable impurities. Moreover, the steel has ≥350 MPa tensile strength at 500°C.;COPYRIGHT: (C)2004,JPO