The influence of pO2 on the base oxide formed 304 L stainless steel has been investigated at 600 °C. alloy was exposed in 5%O2-95%N2 and 10%H2-20%H2O-Ar atmospheres initial stages oxidation were analysed by TEM EDX. In both environments, thin scale consists a Cr-rich overlaid FeCrMn oxide. However, subscale H2-H2O is richer Cr compared to case (∼90 cation% ∼70 respectively). findings are good a...