Study on hot deformation behavior of carbon structural steel with flow stress

► The hot deformation behavior of carbon structural steel Q235A was investigated by isothermal compressive tests. ► Determination of the activation energy for DRX of carbon structural steel Q235A. ► The critical strain as function of deformation parameters was generated. ► DRX kinetics model for Q235A steel was constructed. ► Grain growth kinetics of Q235A was formulated.