ABSTRACT Alumina-forming austenitic (AFA) stainless steels exhibit a unique combination of high temperature creep strength and corrosion resistance. By forming a protective alumina scale, AFA steels exhibit significantly better corrosion resistance than conventional, chromia-forming stainless steels and even Ni-base alloys. To illustrate the oxidation resistance of AFA steel, laboratory exposures are presented in several environments at 550°-900°C including (1) wet air to simulate exhaust gas for thin-walled heat exchangers, (2) steam for power generation applications and (3) high C activities with and without water vapor at 1-16 bar (100-1600 kPa)for the chemical process industry. Oxidation rates for AFA were compared to conventional candidate alloys as well as other Fe- and Ni-base alumina-forming alloys. The reaction products on AFA steel have been characterized using a range of low- to high-resolution analytical techniques.