Influence of the Finishing Rolling Temperature on Properties of Low Carbon Mn Bainitic Steels

The results of Gleeble thermal simulation test show that the grain boundary allotriomorphic ferrites of low carbon Mn bainitic steel was refined and toughness improved obviously with decreasing of deformation temperature. Compared with non-Nb bearing Mn bainitic steel, the microstructure of Nb micro-alloyed Mn bainitic steel was more refined. The results of laboratory test show that the toughness of Nb micro-alloyed Mn bainitic steel can be improved more than that of non-Nb bearing steel and it is prospective for industrialization.