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The numerical simulation of all steps of the production of a steel workpiece is nowadays a widely used tool for understanding and optimization of such processes. The transformation of austenite into ferritic phases is an important feature of heat treatment of steel. Good models for the non-isothermal phase transition are a necessary prerequisite for various other modeling steps. We evaluate some of the existing algorithms based on the isothermal Johnson-Mehl-Avrami model and compare their performance in the case of non-isothermal phase transitions with experimental data for steel 100Cr6 with exponential and linear cooling. The investigations presented here are part of a special research project on distortion engineering (SFB 570 at University of Bremen).