The two-pass hot compressed test for 15 mm plate forged from 50 mm cast slab of spring steel 50CrV4 (/% : 0.53C

0.18Si

0. 84Mn

0.012P

0. 003S

0. 92Cr

0. 12V

0.02Ti) has been carried out by using Gleeble-1500 thermo-simulation machine. The behavior of static recrystallization of steel during deformation at 850 ~ 1000 ℃ with true strain 0. 1 ~ 0. 25

strain rate 0. 1 ~ 10 s

-1

and inter-pass cooling for 1 ~ 80 s is studied and a static recrystallization kinetics model is established. Results show that with increasing temperature

strain

strain rate and inter-pass cooling time the static recrystallizing course of steel 50CrV4 shall be improved ； at 950 ℃ with true strain 0. 25

as strain rate is 0. 1

1 and 10 s

-1

the time to occur 50% recrystallization grains in steel is respective

ly 8. 42

4. 40 and 2.22 s； the activation energy for static recrystallization of steel is 249. 974 kJ· mol

-1

.