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Present situation and prospect of permanent magnet stirring during billet continuous casting |
PENG Jian-fei1, ZENG Jie1, WANG Wan-lin1, CHEN Bo-tao2, YANG Wen-zhi2 |
1. School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China; 2. Quality Department Xiangtan Iron and Steel Co., Ltd., Hunan Valin, Xiangtan 411101, Hunan, China |
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Abstract Electromagnetic stirring has become an important technique to improve billet quality in continuous casting process. Compared with the traditional three-phase AC electromagnetic stirring (EMS), the permanent magnet stirring (PMS) based on sintered NdFeB material has the advantages of higher magnetic induction intensity, lower power consumption and simpler structure. The technical characteristics of electromagnetic stirring and permanent magnet stirring are compared and the present application situation of mold and final permanent magnet stirring during billet continuous casting is introduced. It was reported that the mold permanent magnet stirring can effectively improve the surface and internal quality of the billet, reduce the hole defects on the surface, and improve the central porosity and central carbon segregation of the billet. In addition, permanent magnet stirring was applied in the final solidification position of high carbon steel continuous casting rectangular billet. It was found that the center carbon segregation index of the billet decreases obviously with the increase of the rotating speed of PMS, and the energy consumption of PMS per ton of steel was only about 15% of that of traditional EMS.
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Received: 28 April 2022
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