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A mathematical model has been developed that predicts the final mechanical properties of hot rolled steels, It consists of submodelsfor static and metadynamicrecrystallisation, grain growth andthe transformed ferrite grain size. Each submodelwascharacterised for a wide range of C-Mnand HSLAsteels. Thetotal microstructure model has been integrated into process models and evaluated using production data for plate, structural, bar and strip rolling. Results to date indicate that the accuracy of the model is excellent and is suitable for the evaluation of newsteel grades and the developmentof optimised thermomechanical processing routes.