Abstract
During the past two decades, a new generation of creep resistant ferritic steels has been developed for boiler and turbine component applications in advanced power generation plants operating with inlet steam temperature in the range 600 to 650°C. It is generally accepted that development of new steels with higher creep resistance must be based on detail knowledge of strengthening and degradation processes and structural stability. The aim of the present paper is to point out the most significant strengthening and degradation processes during creep exposure of ferritic steels with respect to chemical composition and structural changes occurring during creep at elevated temperatures. The attention will be devoted to low alloy steels with Cr content up to three mass % and modified chromium steels containing nine to 12 mass % Cr.
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