The effects of riser brick for casting ingot mould used in the smelting equipment of laboratory,vacuum in-duction furnace on quality of steel ingot are greater. The molten steel in vacuum melting furnace is poured into ingot mould through riser brick and steel ingot is formed after cooling. The flow velocity and angle of the molten steel flowing through riser brick,inclusions in molten steel and inner wall of ingot mould all affect quality of steel ingot. In the paper,the opti-mization design for structure of riser brick is introduced,which is to add a diversion platform. On the one hand,the scou-ring force of molten steel to inner wall of ingot mould is reduced so that the service life of ingot mould and surface quality of steel ingot are improved;on the other hand,the retention time of molten steel in riser brick is increased so that the inclu-sions in molten steel float to be removed and internal quality of steel ingot is improved. The practices prove that the design of riser brick with optimization and transformation is reasonable as well as application effects are good.
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