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A coupled thermoviscoplastic finite-element software has been developed for modeling metal flow in hot metal-forming processes, especially for predicting the microstructural changes and mechanical properties of the products. Using this code, the dynamic recrystallization kinetics and recrystallized grain-size distributions during hot metal-forming processes can be simulated. In order to confirm the validity of the code developed, the results of an experiment into 3-dimensional hot upsetting (45 steel) are reported in the present paper, the recrystallized grain sizes being found to be in good agreement with the simulated results.