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The paper presents a model offering improved implementation of material behaviour in plastomechanical simulations of hot‐forming processes. Microstructural states at any instant during forming are evaluated successively on the basis of semi‐empirical equations determining the state of dynamic recrystallization, and the corresponding flow stress is inferred. Upsetting tests were used to determine the characteristic data for a Cr‐V steel in a spectrum of ט = 830–1150°C, ∊ = 0.05–5 s−1 and dγo = 70–108μm. The developed model is used to simulate upsetting tests, validating its accuracy in terms of structural description and flow‐stress determination.