The effect of Nb on the microstructure evolution of low carbon Mn series air cooling bainitic steels has been discussed in this paper by using Gleeble 1500D, SEM, and TEM observation. The results show that: The amount of grain boundary allotriomorphic ferrites is relatively higher in non-Nb bearing steel than Nb-bearing steel under same deformation conditions. And the ferrites in Nb bearing steel are more finer. With the decreasing of finishing rolling temperature (FRT), the particles of Nb(CN) precipitating in Nb bearing steel are smaller and more dispersive. The properties of the Nb bearing steel is higher than that of non-Nb bearing steel at same FRT, and it is suggested that the toughness of Nb Micro-alloyed steel will be improved more effectively than that of non-Nb bearing steel with the decreasing of FRT.
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