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Oxidation characteristics of Type 304 stainless steel in CO2 were observed over the temperature range 1100–1800 F (593–982 C). Although in general oxidation rate curves were parabolic, several periods were observed in which they were approximately linear. These breaks were reproducible and thought to be associated with changes in rate-controlling step of the oxidation process. Carburization of Type 304 stainless steel during exposure to CO2 was observed. Several other alloys were studied, to determine earbiorization mechanism. These included Type 406 stainless steel, a British 20 Cr– 25 Ni, niobium-stabilized steel, Inconel, iron, Fe–1 Cr, Fe–3 Cr, and Fe–10 Cr. Correlation was found between carburization and chromium content, with low chromium favoring and higher chromium inhibiting this reaction. Mechanism was proposed based upon influence of chromium on type of surface oxide formed.

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