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| Influence of electromagnetic braking on metallurgical behavior in thin plate crystallization |
| LI Xuekai1,2, ZHANG Yanchao1,2, ZHANG Caijun1,2, XIAO Pengcheng1,2, ZHU Liguang1,3 |
1. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063000, Hebei, China;
2. Hebei High Quality Steel Continuous Casting Engineering Technology Research Center, Tangshan 063000, Hebei, China;
3. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, Hebei, China |
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Abstract In order to further improve the application effect of multi-module electromagnetic braking system in the process of efficient continuous casting,the FTSC thin slab mold of a steel mill and the new multi-module continuous electromagnetic braking (MM-EMB) system were taken as the prototype,and the characteristics of the flow field inside the mold and the fluctuation degree of steel slag interface were taken as the evaluation criteria. By means of numerical simulation,the multi-physical field coupling calculation of the mold flow field under different electromagnetic conditions was carried out. The influence law of different coil combinations in the multi-module continuous electromagnetic braking system on the characteristics of the flow field in the thin slab continuous casting mold was mainly revealed when different current intensities were applied to the electromagnetic braking system under the condition of high pulling speed of 6 m/min. The results showed that combined with the structural characteristics of the five-hole water outlet,the electromagnetic braking (MM-EMB) system can divide the five groups of coils into two groups of control units according to its scope of operation. The upper control unit contains two groups of coils,and the main scope is the reflux area of the liquid steel flow field. When the current applied by the two groups of coils increases from 400 A to 1 000 A,It can effectively reduce the impact velocity of molten steel on steel slag interface and reduce the fluctuation of steel slag interface. The lower control unit contains three groups of coils,which are mainly used to stabilize the flow of the lower reflux in the mold. When the current intensity of the three groups of coils increases to 800 A,the vortex center and the impact point on the building surface decrease significantly,and the intensity and range of the lower reflux are effectively controlled. When the two groups of control units are acted on the liquid steel flow field of the mold,and the coil current strength of the lower control unit is 800 A,the current value of the two groups of coil of the upper control unit is 800 A to achieve the best braking effect. The results of numerical simulation were applied to the industrial experiment. Through the field data tracking,the slag inclusion rate and crack rate of the casting billet were further reduced. The application of numerical simulation method provides the theoretical basis and technical support for the further optimization of the mold flow field in the multi-module continuous electromagnetic braking system.
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Received: 16 November 2022
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2023, Vol. 58 
