Liquid level fluctuation in mold controlled by electromagnetic nozzle swirling flow in continuous casting of round bloom
SHI Hong-yan1, WU Chun-lei2,3, LIU Li1, TIAN Sheng-lin1, LIU Xiao-ming2,4, WANG Qiang2
1. Laiwu Branch, Shandong Iron and Steel Co., Ltd., Jinan 271104, Shandong, China; 2. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China; 3. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 4. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：In the continuous casting production of round bloom, vigorous mold electromagnetic stirring (M-EMS) could cause violent liquid level fluctuation in the mold, which affects the surface and internal quality in the bloom. An electromagnetic swirling flow in the nozzle (EMSFN) was applied together with the mold electromagnetic stirrer during the continuous casting. The secondary flow induced by M-EMS was weakened by adjusting the stirring direction and the current intensity of the EMSFN device, so that the liquid level fluctuation in the mold could be controlled within a small range. The results show that when the stirring direction of EMSFN device is opposite and the current intensity is 400 A, the fluctuation proportion more than ±2 mm is decreased from 0.62% to 0.13%, and the fluctuation proportion within ±1 mm to ±2 mm is decreased from 5.90% to 3.56%, compared with the results by using only M-EMS in the same strand. When the stirring direction of EMSFN device is the same, the control effect on the liquid level fluctuation more than ±2 mm is not good. Therefore, the liquid level fluctuation can be controlled by the opposite nozzle swirling flow at certain stirring magnitude.
Vivis C. Elaboration of metal matrix composites from thixotropic alloy slurries using a new magnetohydrodynamic caster[J]. Metallurgical and Materials Transactions B, 1993, 24: 493.
[10]
Chang F C, Hull J R, Beitelman L. Simulation of flow control in the meniscus of a continuous casting mold with opposing alternating current magnetic fields[J]. Metallurgical and Materials Transactions B, 2004, 35: 1129.
[11]
Eckert S, Nikrityuk P A, Rabiger D, et al. Efficient melt stirring using pulse sequences of a rotating magnetic field: Part I. flow field in a liquid metal column[J]. Metallurgical and Materials Transactions B, 2007, 38: 977.
[12]
Willers B, Eckert S, Michel U, et al. The columnar-to-equiaxed transition in Pb-Sn alloys affected by electromagnetically driven convection[J]. Materials Science Engineering A, 2005, 402: 55.
LI D W, SU Z J, CHEN J, et al. Effects of electromagnetic swirling flow in submerged entry nozzle on square billet continuous casting of steel process[J]. ISIJ International, 2013, 53(7): 1187.
WU C, LI D, ZHU X, et al. Experimental study of macrostructure and segregation by a novel electromagnetic nozzle swirling flow combined with electromagnetic stirring in continuous casting. Metallurgical and Materials Transactions B, 2021, 52(3): 1207.
2021, Vol. 40 
