Effect of electromagnetic stirring position on liquid steel flow and liquid level fluctuation in continuous casting mold for wide-thick slab
HE Jian-guo1,2, DENG An-yuan1,2, XU Xiu-jie1,2, WANG En-gang1,2
1. Key Laboratory of Materials Electromagnetic Process Research, Ministry of Education, Northeastern University, Shenyang 110004, Liaoning, China; 2. School of Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China
Abstract:To reasonably control the flow of liquid steel and the fluctuation of liquid level in the mold of wide-thick slab and improve the quality of slab. The flow and level fluctuation behavior of molten steel in a 2 200 mm×250 mm continuous casting mold was studied by numerical simulation. The effects of electromagnetic stirring position on the flow and liquid level fluctuation were investigated. The results show that the electromagnetic stirring can enhance the flow of molten steel in the upper reflux area, which is beneficial to uniform composition and temperature of molten steel. The electromagnetic stirring can increase the speed of the molten steel near the nozzle by about 0.04 m/s, and fully enhance the stirring of the molten steel near the nozzle. With the stirring position moving upward, the horizontal swirl flow generated by the electromagnetic stirring can enhance the speed of the downward flow, as a result the position of the lower vortex center in the molten pool moves up. The electromagnetic force promotes the horizontal flow of molten steel, which deflects the upward flow and weakens the speed of the upward flow which can reduce the impact of upward flow on the liquid level and the fluctuation of the liquid level. Raising the position of the electromagnetic stirrer is helpful to control the fluctuation of the liquid level. When the center position of the electromagnetic stirrer is Y=-0.1 m, the liquid level fluctuation can be reduced from 7.5 mm to less than 3 mm, which can reduce the occurrence of slag entrainment, and the flow field still maintains a good symmetry.
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