ICP-OES, DSC?TGA and metallographic microscope were used to study the effect of Cr addition on the solidification structure of metal manganese. The results showed that the solidification structure of metal manganese was mainly columnar dendrite after metamorphic treatment. However, the addition of Cr was beneficial to the refinement of dendritic structure. When the addition of Cr increased from 0 to 3.7%(?), the average grain size was first decreased and then increased. When the addition of Cr was 0, the average grain size of metal manganese was 69.0 ?m. However, with the addition of Cr increased to 2.0%(?), the average grain size reached the minimun, and it was only 37.5 ?m. Further increasing the addition of Cr to 3.7%(?), the average grain size would increase to 51.8 ?m. The increase of number of effective heterogeneous nuclei in melt was the main reason for solidification structure refinement of metal manganese.
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