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| Three-dimensional magneto-hydrothermal coupling model of twin-channel tundish with induction heating |
| CHEN Xi-qing1, XIAO Hong1,2, WANG Pu1, HE Hao2, LAN Peng1, ZHANG Jia-quan1 |
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Magnetoelectric Research Institute, Hunan Zhongke Electric Co., Ltd., Yueyang 414000, Hunan, China |
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Abstract Tundish metallurgy with induction heating is one of cutting-edge casting technologies for improving the cleanliness and quality stability of special steels. Based on the flow-heat transfer coupling model,the influence of the flow control device on the metallurgical behavior of the six-strand T-type twin-channel tundish was studied for bloom steel casting,and the optimized flow control structure of the tundish under the condition of without induction heating was obtained. Accordingly,the electromagnetic-flow-heat transfer coupling simulation of the structure was carried out to study the flow control and thermal compensation of induction heating. The results show that the fluid flow and the consistency of each strand flow can be improved by increasing the height of the channel with double dams. Without induction heating,compared to the prototype tundish,the proportion of dead zone ratio was decreased from 31.4% to 17.6%, the proportion of piston zone was increased from 19.1% to 39.1%, the standard deviation of average residence time was reduced from 99.6 to 40.3 s,and the consistency of each flow is significantly improved. After the induction heating is employed,the flow field in the tundish is more complicated and the molten steel at the outlet of the channel has an obvious upward flow,which prolongs the average residence time of the molten steel and facilitates the floating and removal of inclusions. After 30 min of induction heating,the average temperature of each outlet of the tundish increased from 1 798.1 to 1 827.2 K compared to the case without induction heating,indicating that induction heating can effectively compensate for the heat loss during the steel casting. This function is beneficial to conduct low superheat casting under a constant speed,which means an improved tundish metallurgical effect for both the steel cleanness and as-cast structure.
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Received: 29 September 2020
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2021, Vol. 56 
