The double passes rolling and cooling process of 20 mm E36 ship plate steel (% : 0. 15C

0. 38Si

1.56Mn

0.011P

0. 002S

0. 04Nb

0. 06V

0.02Ti

0. 037Als) at 1 080 °C and 830 〜890 T respectively by 30% deformation at strain rate 1s

-1

has been simulated by thermal simulator to get continuous cooling transformation curves and study effect of finishing roiling temperature and cooling speed (5 ~25 °C ) after rolling on transformation and structure of the steel. Results show that with increasing cooling speed the initial temperature of transformation decreases

the volume fraction of pearlite decreases and the volume fraction of bainite increases； with decreasing finishing temperature the initial temperature of transformation increases; and with increasing cooling speed and decreasing finishing temperature the ferrite grain size is finer.