Creep and creep rupture strength property of Grades T/P92 steels are investigated. Assessment of creep rupture strength is examined by region splitting analysis method with the use of three type time-temperature parameters (TTP) of Larson-Miller, Orr-Sherby-Dorn, and Manson-Succop parameters. According to the evaluated creep rupture strength, the current allowable stress of Grades T/P92 steels is reviewed. Remarkable drop in creep rupture ductility of the steels is recognized in the low-stress and long-term regime where the ratio of stress to 0.2% offset yield stress is 50% and below, and it is discussed in consideration of change in creep deformation property.

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