Simplicity, accuracy and confidence in predicting long-term rupture properties from short-term data: a study of four heats of 2.25Cr1Mo0.3V steel

ABSTRACTModels of rupture data formulated recently by conventional methods for different heats of a 2.25Cr1Mo0.3 V pressure vessel steel are compared to models of the same data formulated by the P-NID (parametric, numerical isothermal datum) procedure. The alternative models are evaluated according to the accuracy with which they replicate the data. Confidence in the prediction of long-term properties from these models is discussed, and it is argued that major extrapolations may be considered reliable for models that satisfy the simple criteria of accuracy of the P-NID procedure.KEYWORDS: Creep rupture2.25Cr1Mo0.3V steelrupture modellinglong-term extrapolationP-NID procedurecriteria of accuracy Disclosure statementNo potential conflict of interest was reported by the author(s).