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This paper presents experimental and numerical analyses of the thermomechanical behaviourthat takes place in SAE1020 mild steel cylindrical specimens during the conventional tensile test. A set ofexperiments has been carried out in order to obtain the stres-strain curve and the diameter evolution atthe neck which allow, in turn, to derive the elastic and hardening parameters characterizing the materialresponse. Temperature evolutions have also been measured for a high strain rate situation. Moreover, afinite element large strain thermoelastoplasticity-based formulation is proposed and used to simulate thedeformation process during the whole test. Some important aspects of this formulation are discussed.Finally, the results provided by the simulation are experimentally validated.