A new electroslag furnace with mould rotation was designed, and the effect of mould rotation speed on M2 high speed steel solidification process was studied. A double-electrode series-electroslag remelting method was used in the experiment, the secondary dendrite, cooling rate, permeability and slag thickness of M2 high speed steel prepared at different mould rotational speeds were analyzed, calculated and counted. The results showed that the dendrites of M2 high-speed steel at the center and the edge were broken with the increase of the mould rotational speed, and the faster speed of mould rotate, the dendrite was broken more obviously. When the mould rational speed was increased from 0 to 19 r/min, at center and edge of M2 high speed steel, the average secondary dendrite spacing decreased by 19.47% and 25.23%, and the permeability decreased by 34.94% and 44.04%, the average cooling rate increased by 97.01% and 148.06%, respectively. The mould rotation reduced the thickness of the slag skin by 40.41%, and the variance of the thickness of the slag skin was reduced from 0.163 to 0.003, and the slag skin became uniform. On the one hand, the slag skin became thinner and uniform, which increased the heat transfer of the molten metal pool to the mould, so that the molten metal pool became shallow, on the other hand, the dendrites were broken, the reduction of the average secondary dendrite spacing and the decrease of permeability of M2 high speed steel can control the segregation of M2 high-speed steel during solidification. The solidification quality of the M2 high speed steel was improved by mould rotation.
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