Physical Simulation Experiment On Processing Phenomenon In Continuous Casting Tundish With Electromagnetic Induction Heating

The technology with electromagnetic induction heating in channe can compensate for the temperature drop during the first pouring,the transfer and the casting period,it is an important technology.the realization of low superheat and constant pouring temperature in continuous casting process.At the same time,it can have a good effect remove small non-metallic inclusions in the molten steel and improve the quality of casting billet.So that this technology has been a devoted attention on.metallurgy area.In this paper,a channel induction heating tundish in a domestic steel plant is used as a prototype to establish a physical model on the scale of 0.5:1.Taking the lead-tin alloy as the simulated medium and the aluminium oxide as the inclusion particles.The experiment platform for melt flow and solidification are set up to study the electromagnetic field characteristics,the changing of temperature and the removal effect of inclusions under the electromagnetic induction heating to get a better process parameters and time parameters.According to the experimental results,we can get the following results:(1)Under the normal cooling condition without electromagnetic induction heating,the natural cooling rate of the alloy fluid in the experimental device is about 0.5?/s.In the case of electromagnetic induction heating,the temperature in the tundish is obviously higher than that without induction heating.The rise of temperature between 10?20?,when the power is 6.6kW.(2)The heating effect of electromagnetic induction heating device on molten metal is mainly concentrated in the channel.When the electromagnetic power is 3.6kW and 6.6kW,the rise rate of temperature is1.36?/s and 4.6?/s respectively.(3)The annular stainless steel tube is an analog to measure the magnetic field distribution under electromagnetic induction heating.The magnetic field is circularly distributed along the surface of stainless steel tube,and the magnetic field intensity is basically the same in the axial direction of stainless steel tube:The intensity of magnetic field increases with the increase of voltage,and the increasement trend gradually slows down and tends to balance when the voltage is about 275V.(4)The quantities of inclusions in the central area of the channel is reduced and the quantities of inclusions in the edge region is increased by electromagnetic induction heating.It is shown that the electromagnetic induction heating can migrate inclusions in the central area to the edges of both sides,which will be beneficial to the removal of inclusions.(5)Under the conditions of this experiment,it is benefit to remove the non-metallic inclusions particles,which size is between 25?m to 45?m by the electromagnetic induction heating device.The total effect is not obvious for the smaller(about 5?20 ?m)inclusions.The suitable process parameters for removing inclusions are heating power 9.0kW and working time 20s.