The tested non-quenched-tenipered steel 48MnVS (/% ： 0.48C

0.60Si

1.50Mn

0.35Cr

0.14V

0.05S

0.020Al

0.0150N) is melted by an 100t EAF

cast to 280 min x 360 mm bloom and rolled to Φ100 mm bar products. The recrystallization precess of austenite in vanadium microalloying non-quenched-tempered steel 48MnVS singlepass compressed with defonnation 60% and deformation rale 0.1-10 s

-1

temperature at 950-1150℃ is studied by using a Gleeble-3800 thermal simulation tests machine lo gel true stress-true strain curves

and the dynamic recrystallization grain size model and the dynamic recrystallization slate diagram in tested sleel are obtained by calculation. Results show that with higher deformation temperature ant lower deformation rate

the stored energy of deformation for occurring

dynamic recrystallization is lower therefore dynamic recrystallization of vtuiadium microalloying non-quenched-tempered steel 48MnVS occurs more easily. The activation energy Q

d

for dynamic recrystallization of tested steel 48MnVS is 343.202 kJ/mol.