Continuous cooling transformation (CCT) curves of non-deformed (static) and deformed (dynamic) austenite of Nb-V-Ti microalloying 08MnCr high strengh steel (S2) at 910~1200 ℃ with cooling rate0.05～30℃/s were measured by using Thermec Master-Z thermal simulator

and corresponding transformation and  structure were analyzed and observed. Test results showed that with increasing cooling rate after rolling

the Ar3 transformation point decreased led to further fine the grain of steel; with cooling rate more than 10 ℃/s

the bainite transformation occurred. With increasing heating temperature the transformation temperature decreased

and the transformation temperature for deformed austenite was higher than that for non-deformed austenite. With lower cooling rate the ferrite grain was polygon

and with higher cooling rate the ferrite grain presented pointed shape.