FERRITIC STAINLESS STEEL EXCELLENT IN HIGH-TEMPERATURE OXIDATION RESISTANCE AND SCALE ADHESION

摘要

A ferritic stainless steel excellent in high-temperature oxidation resistance and scale adhesion, which comprises at most 0.03 % (by mass, the same will apply hereinbelow) of carbon, 0.80-1.20 % of silicon, 0.60-1.50 % of manganese, 11.0-15.5 % of chromium, 0.20-0.80 % of niobium, at most 0.1 (inclusive of 0) % of titanium, 0.02-0.30 (exclusive of 0.30) % of copper, at most 0.03 % of nitrogen, at most 0.05 (inclusive of 0) % of aluminum, at most 0.012 % of oxygen, and the balance consisting of iron and inevitable impurities, provided that the value of Mn/Si must be in the range of 0.7 to 1.5 and that the content of each component is regulated so that it can satisfy the relationship of formulae (2, 3 and 4) as set forth in the specification. The steel has the oxidative weight gain and scale release of at most 0.02 kg/m<2> and at most 0.01 kg/m<2>, respectively, after continuous heating in an atmospheric environment at 900 DEG C for 100 hours and at most 0.4 kg/m<2> and at most 0.02 kg/m<2>, respectively, after continuous heating in an atmospheric environment at 1,000 DEG C for 100 hours.