Abstract
Tundish with channel-type induction heating is one of new technologies adopted widely in China by the steel industry in the recent years, which can supply a constant liquid steel temperature control for the sequenced continuous casting process. For a five-strand tundish with induction heating in service, a kind of novel bifurcated split channel has been designed to solve the poor consistency of temperature and fluid flow for each strand that occurs with the conventional straight channel-type. The temperature distribution and fluid flow behaviors under the two structure modes were compared numerically by an electromagnetic-heat-flow multi-physics field coupling model. The results show that the maximum temperature difference between each strand outlet of the tundish can drop to less than 4 °C upon using the bifurcated channel, as compared to 10 °C under the original straight channel mode. According to the simulated results, case FK-A0 has been chosen as the optimized structure for industrial application. It has been verified through temperature measurements during the casting operation that the novel bifurcated split channel can improve the consistency of steel temperature for every strand of the tundish. The average temperature difference between the edge strand and the middle strand is 4.25 °C lower than the original straight channel, resulting in an upgraded metallurgical effect for the induction heated tundish.
Highlights
Special steels are key materials for engineering equipment manufacture, with strict requirements in the refining and casting process for the control of uniformity and purity [1,2]
The superheat of molten steel during the continuous casting is an important factor affecting the cast structure of steel semi-products and their quality consistency of different strands [3,4,5,6], while the tundish plays a crucial role in the casting process
T-shaped multi-strand tundish is widely adopted for billets casting during the production of special steel long products
Summary
Special steels are key materials for engineering equipment manufacture, with strict requirements in the refining and casting process for the control of uniformity and purity [1,2]. The stability of the molten steel temperature during sequence casting and the consistency of the casting temperature for the different strands are the key factors to evaluate the overall metallurgical behavior of the tundish. For a multi-strand tundish, an irrational flow control device will result in poor consistency in the casting temperature between each strand [7,8,9]. For this reason, the heating and temperature control technology has been given considerable attention for the improvement of tundish metallurgy [10,11,12]. There are two main temperature control measures for tundish through heat compensation of the power input: one is plasma guns, and the other is channel-type induction heating
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