ASSESSMENT OF HIGH-ALLOYED CREEP RESISTANT MATERIALS

Austenitic steels and nickel alloys are used in power plants with higher working parameters (temperature, pressure). These materials are applied especially at the outcome levels producing over-heated or supercritical steam. Creep strength is achieved by comprehensive strengthening of materials given by their fundamental constitution and proceeding even under operation temperatures. Under these conditions, oxidation resistance depends predominantly on both the content of chromium and its ability to transfer towards the metal-oxide interface. The paper compares different high-alloyed materials mostly in the subsurface area, which interacts with steam during the application.