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High-chromium heat-resistant steels(such as T92 martensitic steel)have been widely used as key materials to improve the condition of steam pressure and temperature in the boiler tube system of the supercritical power plants.Material-related failures in boiler system have occurred due mainly to internal oxidation and corrosion.For stable maintenance of boilers,determination of the corrosion mechanism,microstructural evolution and data collection pertaining to the oxidation is a key.