A semiphysical model has recently been constructed by Parker that calculates the phase transformation behaviour of engineering steels as a function of time for an arbitrary cooling path. To compare the model with measured diagrams from the literature for linear cooling, a large number of continuous cooling transformation (CCT) diagrams have been calculated. The quantified comparison has been used to construct heuristics that indicate the accuracy of the model as a function of the steel composition. For 10 alloying elements the domain for which the model is valid has been established.
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