Abstract
Type 430 stainless steel with 0.9 wt% manganese was oxidized in O 2/H 2O/N 2 atmospheres at 1273 K. Iron-rich corundum-type oxide formed in the very initial oxidation stage changed to a chromium-rich oxide with time in all atmospheres. The chromium content in a spinel-type oxide, which appeared after formation of the the corundum-type oxide, increased with increasing oxygen partial pressure. It is considered that the spinel-type oxide forms through a two-step reaction: first, reduction of Mn 2O 3 to MnO; second, solid-state reaction of MnO with corundum oxide. The rate-determining step appears to be the first reaction.
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