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Ferritic and martensitic steels for power plants

P.J. Ennis,    University of Leicester, UK

Abstract:

The metallurgical background and the physical properties of the steels used in power plants are briefly described. The microstructures of the steels after production heat treatment and after long-term service exposure are discussed and the mechanical properties, especially the creep rupture strength, are shown. The strengthening mechanisms are considered and effects of the microstructural changes after long-term service exposure on the creep rupture strength explained. Because of the microstructural changes, care has to be taken in deriving long-term creep rupture strength estimates from experimental data. It is shown that steam oxidation may ...

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