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Fe-2.25%Cr-1%Mo alloys were corroded at 600, 700 and 800 oC for up to 70h in 1 atm of N2/H2O/H2S-mixed gases. The base metal sulfidized to FeS. This at the outer scale formed by the outwardly diffusing Fe ions, whereas that at the inner scale formed by the inwardly diffusing sulfur ions. Some of FeS at the inner scale further reacted with Cr2S3 to the FeCr2S4 spinel. The alloying elements of Cr and Mo sulfidized by the inwardly diffusing sulfur ions at the inner scale. Although FeCr2S4 can suppress sulfidation to a certain extent, the alloys corroded fast, owing to the formation of the nonstoichiometric FeS

Corrosion of Fe-2.25%Cr-1%Mo steels at 600-800oC in N2/H2O/H2S atmospheres