Abstract：Based on conventional C-Mn steel, low alloyed element Ti was appropriately added to the experimental steels, and the content of Mn was adjusted. Meanwhile, the simple thermo mechanical control process (TMCP) was adopted. As a result, the good microstructural morphology and nano-scale precipitates were obtained. Therefore, the strength of steel plate obviously increased under the premise of guaranteed good elongation, and the cost of steel was reduced significantly. The microstructures were observed by OM, SEM, and TEM. The results show that when Mn content in the experimental steels increases from 1.05% (mass fraction) to 1.5%, the average grain size is refined from 6.4μm to 5.2μm, the nano-scale precipitates of TiC increase evidently. At the same time, the yield strength, the tensile strength and elongation increase by 56.7, 42.2MPa and 1.2%, and reach 558.7, 662.2MPa and 22.4%.
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