Abstract: In order to solve the problem that induction heating device can not be installed in the tundish of traditional continuous casting equipment， a new butterfly induction heating tundish was designed. A three-dimensional unsteady magnetic-thermal-flow coupling mathematical model was then established to study the effect of electromagnetic field on the flow and temperature fields in the butterfly tundish， revealing the relationship between induction heating power and temperature rising characteristics. The results showed that the induced current formed a closed loop in the tundish and was mainly concentrated in the channel. The eccentric electromagnetic force rendered the steel to spin in the channel with large tangential velocity， and the steel flowing out of the channel moved up to the casting chamber. When the flow rate of tundish was 2t/min and without induction heating， the outlet temperature drop was 7K. However， under induction heating， when the heating power increased from 600kW to 1000kW， the outlet temperature rise was elevated from 8K to 27K.

Key words: butterfly induction heating tundish; electromagnetic field; flow field; temperature filed; temperature rising characteristics