Abstract：In order to solve the relatively developed columnar crystal growth of 20CrMnTi gear steel slab and the uneven distribution of slab elements，the pulsed magneto oscillation (pulsed magneto oscillation，PMO) solidification homogenization technology developed by Shanghai University which achieves perfect results in continuous casting production were used to homogenize 20CrMnTi gear steel billet. The experiment results of 20CrMnTi gear steel show that the area rate of central equiaxed grain in 20CrMnTi gear steel billet treated by PMO is two times that of billet without PMO. As a result，the center carbon segregation index decreases from 1.22 to 1.04. The solute distribution measured by Insitu metal analysis (LIBSOPA200) presents that each element distribution in billet treated by PMO is more uniform，which indicates that the macro segregation in continuous casting billets is effectively controlled by the application of PMO. This technology provides a new method for improving the internal quality of continuous casting billet in the future.
