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ABSTRACT
The evaporation of protective chromia scales is expected to be a primary oxidation mechanism. An oxidation test of austenitic steel TP347HFG in supercritical water was carried out at 550 and 600°C under 25 MPa with a dissolved oxygen content of 2000 ppb. The results show that the protective chromia scale forms at the earlier stage and then disappears gradually with the increasing exposure time due to chromium evaporation in the presence of both dissolved oxygen and supercritical water. The effect of chromia evaporation on oxidation resistance of austenitic steels in supercritical water is discussed.