Abstract: Predictions as to 105 h creep rupture strength of grade 91 steel have been made recently. The predicted values are examined with long-term creep rupture data of the steel. Three creep rupture databases were used in the ...

Abstract: Creep rupture strength of creep strength enhanced ferritic steels is often overestimated, and its evaluated value has been reduced repeatedly. In this paper, the cause of the overestimation is discussed, and the creep ...

Abstract: Conventional timetemperatureparameter (TTP) methods often overestimate longterm rupture life of creep strength enhanced ferritic steels. Decrease in activation energy Q for rupture life in longterm creep is the cause of ...

Abstract: Grade 91 steel is widely used as steam pipes in ultrasupercritical (USC) steam boilers. In residual creep life assessment of the pipes by calculation, one needs creep rupture life of the steel as a function of stress and ...