IRON-CHROMIUM-ALUMINUM-BASED OXIDE DISPERSION STRENGTHENED STEEL AND METHOD FOR PRODUCING SAME

摘要

[Problem] To provide: an iron-chromium-aluminum-based oxide dispersion strengthened steel which can exhibit excellent high-temperature strength even at high temperatures of 1000°C or higher and which does not undergo the deterioration of oxidation resistance; and a method for producing the steel. [Solution] An oxide dispersion strengthened steel 1 which has an aluminum oxide coating film 2 formed on a surface thereof and in which a yttrium-zirconium composite oxide 3 is dispersed, wherein excess oxygen that is oxygen existing in the oxide dispersion strengthened steel 1 excessively more than the amount required for forming yttrium oxide is contained at a molar ratio of 2 or more relative to the amount of zirconium.