Abstract: Through oxide weight gain experiment，SEM and XRD analysis， the effects of Cr content were studied on the high-temperature oxidation behavior， the microstructures and phase compositions of oxidation scale of a high-manganese austenitic twinning-induced plasticity (TWIP) steel oxidized at 700℃ for 8h. The results show that with increasing the Cr content， the anti-oxidation ability of this high-manganese austenitic TWIP steel increases. When the Cr content is 1.13wt%， the mass gain of the steel oxidized at 700℃ for 8h is about 30μg/mm²， while the Cr content increases to 3.95wt%， the mass gain decreases to 3μg/mm². Moreover， with increasing the Cr content， the compactness of oxide scale increases， and there are significant differences in the composition of oxide scales.

Key words: austenitic steel, TWIP (twinning-induced plasticity) steel, Cr content, high-temperature oxidation, oxidation product