LIU Tao1, ZHAO Meng-jing2, YANG Shu-feng2, LI Jing-she2, CHEN Yong-feng1, WANG Cun2
1. Wuhu Xinxing Ductile Iron Pipes Co., Ltd., Wuhu 241002, Anhui, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Controlling the temperature variation of molten steel in tundish is one of the effective methods to improve productivity and product quality. The tundish plasma heating can compensate for the temperature drop of molten steel during pouring, stabilize the temperature of molten steel and improve the quality of slab. The industrial practice of tundish plasma heating were studied. The molten steel in tundish was heated by a plasma heating device with three hollow graphite electrodes. Through two groups of tundish plasma heating practice, the effects of plasma heating in tundish on the temperature change, composition change and inclusion characteristics of molten steel were studied. The results showed that the heating effect of molten steel in tundish heated by plasma was obvious, the heating rate can reach 0.8 ℃/min and the temperature can be maintained in a stable range. After plasma heating, the total oxygen content of molten steel in tundish decreased, the nitrogen content basically remained unchanged, and the carbon content slightly increased. At the same time, the number density of inclusions in molten steel obviously decreased by 7.43% and 19.68%, respectively. The tundish plasma heating could stabilize the superheat of molten steel in tundish, promote the floating and removal of oxide inclusions and enhance the quality of slab.
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2020, Vol. 30 
