Control of VC-EMBr on molten steel flow and bias flow in CSP mold
ZHANG Ran1,2, XU Lin1,2, HAN Ze-feng1,2, DONG Wang-zi1,2, WANG En-gang1
1. Key Laboratory of Electromagnetic Processes of Materials Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：In compact strip steel (CSP) thin slab continuous casting mold, only a horizontal full-width electromagnetic brake (Ruler-EMBr) is installed under the submerged entry nozzles. In the case of further increasing CSP casting speed, Ruler-EMBr cannot effectively control the flow rate of molten steel and the stability of liquid level in the CSP mold. Therefore, a new type of vertical combined electromagnetic braking technology (VC-EMBr) was proposed in this paper. The control effect of VC-EMBr and Ruler-EMBr on the conventional molten steel flow and the bias flow caused by clogging of submerged entry nozzles in the CSP mold were numerically simulated with the commercial software ANSYS FLUENT. The research results show that, when applied the VC-EMBr, an overall "concave" distribution of steady-state magnetic field is formed on the wide sides of CSP mold. Under the premise of maintaining electromagnetic characteristics and effective control to downward flow and bias flow in the mold of horizontal magnetic poles in Ruler-EMBr, and a vertical steady-state magnetic field with a magnetic induction intensity of 0.26 T is formed in the impact area of molten steel from SEN and the fluctuation area at the meniscus near narrow sides of mold, it can effectively control the upward flow of molten on the narrow sides of mold and decrease the flow rate of free surface for molten steel. So that with the VC-EMBr, the flow velocity of molten steel on the free surface of CSP mold is controlled in a reasonable range, and the velocity distribution of entire free surface in CSP mold is more uniform. VC-EMBr overcomes the insufficient control of Ruler-EMBr to upward flow and surface velocity of molten steel in CSP mold, and it can provide a new technical measure to further increase the drawing speed of thin slab continuous casting.
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ZHANG Ran, XU Lin, HAN Ze-feng, DONG Wang-zi, WANG En-gang. Control of VC-EMBr on molten steel flow and bias flow in CSP mold[J]. China Metallurgy, 2022, 32(1): 44-51.
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2022, Vol. 32 
