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Sanicro 25 (22Cr25NiWCoCu) is a newly developed austenitic stainless steel used in the boiler pressure superheaters and reheaters with ultra-supercritical high-efficient parameters. The paper presents the results of microstructure testing and secondary phase separation processes after 20,000 h ageing at 700 and 750 °C. In the initial stage of ageing, the precipitation of numerous very small M 23 C 6  chromium carbides and Laves phase were observed. The long-term ageing related to temperature revealed the existence of secondary phases: M 23 C 6 , MX, NbCrN, Laves phase and σ phase. The test results presented in the paper are part of the developed material characteristics to be used for predicting the service life of the material of components operated under creep conditions.

The Influence of Long-term Ageing on the Microstructure of Sanicro 25 Steel