This paper investigates the combined effect of shot peening and pre-oxidation treatment in air on the subsequent steam oxidation resistance of Modified 9Cr-1Mo steel with different sulfur contents. Cast steel balls (50-180 μm diameter) and pure Cr (50-230 μm diameter) were used for shot peening durations of 5-50 seconds. After shot peening, pre-oxidation was performed in air at 973K for 3.6ks. Then, oxidation testing was conducted in steam at 923K for up to 3.6Ms. Only the combination of Cr shot peening and pre-oxidation treatment facilitated the formation of a protective Cr-rich oxide scale on the specimen surface during pre-oxidation. This Cr-rich oxide scale remained stable during subsequent steam oxidation, resulting in excellent oxidation resistance of the steel.

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