Abstract
The steamside oxidation behavior of T92 steel tube for high temperature reheater after long-term service in ultra-supercritical boilers was investigated. The structure evolution process, phase composition and element distribution of the oxide film were studied. The oxide film consisted of outermost layer with hematite, subouter layer with magnetite and inner layer with Fe-Cr spinel. The structure of the transition zone of the oxide film and related oxidation mechanism was discussed in detail. A steam oxidation kinetic model of the T92 reheater based on the evolution of the inner layer thickness of the oxide film was established.
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