Temperature-dependence of oxidation and carburization of Grade 91 steel in CO2 containing impurities (original) (raw)

Abstract

Future CO2 based power systems require steels resistant to corrosion in high-temperature CO2-rich environments. Candidate 9Cr ferritic-martensitic steels degrade by surface oxidation and substrate carburization, both of which can be strongly affected by impurities in the CO2. Herein we studied Grade 91 steel exposed to 95%CO2-4%H2O-1%O2 with/without 0.1% SO2 at 1 atm and 550, 600, 650 °C for up to 3000 h to establish the temperature-dependence of these processes. SO2 showed little effect on oxidation at 550–600 °C but reduced carburization, while the combination of SO2 and faster alloy diffusion at 650 °C resulted in significant reduction in both oxidation and carburization.

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