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ABSTRACT Models 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.
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