Abstract
In order to optimize the thermal forging process of 37CrS4 special steel, single-pass thermal pressing tests are conducted, and a strain compensation based on Arrhenius constitutive equation is proposed based on the stress-strain curves of 37CrS4 at the temperature of 900–1100 °C and the strain rate of 0.1–10 s⁻¹. The stress values calculated from the equation are in good agreement with the counterparts in the thermal simulation compression test. The high correlation between the calculated and experimental data verifies the correctness of the strain compensation Arrhenius constitutive equation. According to the dynamic material model and instability criterion, the processing maps of 37CrS4 are established. It is concluded that 37CrS4 is more suitable for thermal working at a strain rate of 0.1–0.37 s⁻¹ and temperature of 1000–1100 °C.

Key words
37CrS4 special steel, stress-strain curves, Arrhenius constitutive equation, strain compensation, processing maps

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