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The hot compression deformation behaviors of 70Cr3Mo steel were studied in the different deformation conditions on Gleeble-1500 thermo-simulation machine, the temperature range was 850-1150 ℃, and the strain rate was 0.01-10 s-1. According to the experimental data, the relationship between the stress and strain was analyzed, and the constitutive equations and the processing map were established. By the stress-strain curve, the peak stress increased with the increase of strain rate under the given compression temperature, and the peak stress decreased with the increase of deformation temperature under the given strain rate. The processing map calculated and analysed at the true strain of 0.5 shows that there are two instability zones of hot deformation for 70Cr3Mo steel，including the zone in the deformation temeratpure range of 850-940 ℃ and the strain rate range of 0.01-1.6 s-1 , and another zone in the temperature range of 975-1150 ℃ and the strain rate range of 1-10 s-1. The obtained optimum technology parameters are temperature range of 1000-1150 ℃ and strain rate range of 0.01-0.36 s-1.
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