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| Simulation of the effect of EMBr on the dynamic behavior of molten steel in thin slab with high casting speed |
| MA Ming1, ZHENG Xu-tao1, YU Yao1, WANG Shi1, TIAN Zhen1, XIE Qing-hua2 |
1. ESP Department, Rizhao Steel Holding Group Co., Ltd., Rizhao 276800,Shandong,China;
2. College of Metallurgy, Northeastern University, Shenyang 110819,Liaoning,China |
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Abstract In the research on the production technology of thin slab with high casting speed, the steel flow field in the mold is the key factor to determine the slab quality problems such as the uniformity of slab shell and the probability of liquid level slag entrapment. EMBr can significantly change the flow field of molten steel, which is the key process technology to improve these problems. Therefore, it is essential to simulate, analyze and optimize the steel flow field in the mold. In the previous research, there are few relevant data and theoretical guidance, and there are few reports on the analysis and research of high casting speed continuous caster for thin slab endless rolling line. Based on the high casting speed continuous caster, the magnetic induction distribution of different electromagnetic braking current intensity in the mold is obtained by numerical simulation. Using the coupling mode of electromagnetic and multiphase flow, the flow field distribution and liquid surface morphology of steel in mold under different magnetic induction intensity are simulated, and the influence of electromagnetic braking on liquid surface fluctuation is analyzed. The results show that: Based on the fixed working condition environment, when the electromagnetic braking current value is 175 A, the flow field of steel is evenly distributed, the liquid surface velocity of steel is relatively lowest, the maximum velocity is about 0.6 m/s, and the liquid surface height difference and shear angle are relatively minimum. This condition is most conducive to reducing the probability of slab defects caused by uneven shell or liquid level slag. When the current value is 225 A, compared with 125 A, the magnetic induction intensity at the liquid level of steel is only increased by 0.02 T, and the time for the liquid level to reach stability is only shortened by about 1 s. Therefore, there is an optimal current value under comprehensive evaluation.
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Received: 26 February 2022
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2022, Vol. 41 
