The High Temperature Oxidation Behavior of Nickel-Free High Nitrogen Austenitic Cr_18Mn_16N_0.83Nb_0.15 Stainless Steel

The nickel-free HNASS Cr_18Mn_16N_0.83Nb_0.15 was fabricated using smelting method. The high temperature oxidation kinetics of as-fabricated steel, which has a single austenitic structure, was investigated by monitoring the mass gain method. The results suggest that the oxidation behavior follows a parabolic law at 950~1150°C interval 100°C in air. Qcalculated is 191.404 KJ·mol-1using Arrhenius equation. The morphologies, elements distribution and structure on the surfaces of as-oxidized films were studied by SEM, EDS and XRD methods.