The effects of tempering temperature on dynamical mechanical properties of 50SiMnVB alloy steel are researched with dynamic compression experiments.Effect of tempering temperature on hardness of 50SiMnVB alloy steel is studied with hardness test.Normalized 50SiMnVB alloy steel is quenched at 860 ℃ and tempered at five kinds different temperature: 200 ℃

300 ℃

400 ℃

500 ℃

600 ℃.Three groups with bigger hardness difference are picked out in these samples.They are respectively normalized 50SiMnVB alloy steel and 50SiMnVB alloy steel tempered at 200 ℃ and 600 ℃.The results show that the yield stress increases when the strain rate is improved.This point illuminates that 50SiMnVB alloy steel is sensitive to the strain rate.50SiMnVB alloy steel tempered at 200 ℃ for dynamic compression experiment is destroyed in the form of cutting rupture at 45°.The results indicate that its yield stress is higher than the other two but it is more brittle.Normalized 50SiMnVB alloy steel and 50SiMnVB alloy steel tempered at 600 ℃ have not been destroyed in the process of dynamic compression experiment.