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A 0.34% carbon steel was subjected to hot working (800-1100°C) by Gleeble compression to 0.7 strain at strain rates of 0.1-8 S-I, cam plastometer compression to 0.4 strain at strain rates of 3.5-100 s-1 and torsion to fracture strains~8 at strain rates of 0.05-4 s-1. The compressive flow curves exhibited continual hardening towards saturation except at high temperatures or low strain rates where work softening finally occurred; in torsion, the curves exhibited the peak, softening and steady state characteristics of dynamic recrystallization. The sinh-Arrhenius constitutive equation was found suitable for describing the compression tests at a series of strain levels. The constants are power functions of strain with negative exponents; however, they differ for the two compression techniques as a result of anvil/ specimen contact friction in the Gleeble tests and the presence of a glass lubricant in the cam plastometer. Each set of constants can be employed to predict the flow curves of the other compression test with errors of only 7% as well as the stresses at the peak strains in torsion.Resume-Un acier 0.34% carbone a ete soumis a une deformation de 0.7 a chaud (800-1 100°C) lors d'une compression de Gleeble (e = 0.