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| INFLUENCE OF MAGNETIC FIELD INTENSITY MATCH OF FC MOLD II ON METAL FLOW |
| JIA Hao, ZHANG Zhenqiang, YU Zhan, DENG Kang, LEI Zuosheng, REN Zhongming |
| School of Materials, Shanghai University, Shanghai 200072 |
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Cite this article:
JIA Hao ZHANG Zhenqiang YU Zhan DENG Kang LEI Zuosheng REN Zhongming. INFLUENCE OF MAGNETIC FIELD INTENSITY MATCH OF FC MOLD II ON METAL FLOW. Acta Metall Sin, 2012, 48(9): 1049-1056.
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Abstract Electromagnetic brake (EMBr) affects the flow field in mold during the slab continuous casting process. Flow control mold II (FC Mold II) has been developed to resolve the defects of the third generation (flow control mold) of EMBr which the braking effect on meniscus is too strong to make the surface flow excessively stabilize and it would be prone to freezing and related defects. To gain a fundamental understanding of FC Mold II, a mercury physical model was developed to investigate the influence of the magnetic field intensity match on metal flow in FC Mold II based on the\linebreak 1350 mm×230 mm slab continuous casting process in a factory. The flow regime and velocity distribution in mold were measured by ultrasound Doppler velocimeter (UDV) with the maximum magnetic field intensity of the upper pair of magnetic poles B1=0.18, 0.36 and 0.50 T respectively and the maximum magnetic field intensity of the down pair of magnetic poles B2=0.50 T, while the mold casting speed is 0.41, 0.52 and 0.82 m/min respectively corresponding to the practical casting speed 1.00, 1.30 and 2.00 m/min respectively. The influences of the magnetic field intensity match on the flow discharged from the nozzle, the flow near the meniscus and the washing intensity to the mold narrow wall were analyzed and studied. The results showed that, when the magnetic field intensity match of the upper and the lower pair of magnetic poles B1/B2≤1, with the continuous casting speed increasing, the value of B1/B2 should increase in order to get an ideal braking effect. The value of B1/B2 should be 0.36, 0.72 and 1.00 respectively when the model casting speed is 0.41, 0.52 and 0.82 m/min respectively. The increasing of the intensity of the magnetic field reduces the “flow passage” effect caused by EMBr, and is conducive to the formation of the plug flow under the electromagnetic braking region.
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Received: 24 February 2012
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| Fund: Supported by National Natural Science Foundation of China (No.50674066) |
| [1] Ttimmel K, Eckert S, Gerbeth G. Metall Mater Trans, 2011; 42B: 68[2] Cukierski K, Thomas B G. Metall Mater Trans, 2008; 39B: 94[3] Li B K, Tsukihashi F. ISIJ Int, 2006; 26: 1833[4] Yu Z, Zhang Z Q, Ren ZM, Lei Z S, Deng K. Acta Metall Sin, 2010; 46: 1275(于湛, 张振强, 任忠鸣, 雷作胜, 邓康. 金属学报, 2010; 46: 1275)[5] Harada H, Toh T, Ishii T, Kaneko K, Takeuchi E. ISIJ Int, 2001; 41: 1236[6] Hwang Y S, Cha P R, Nam H S, Moon K H, Yoon J K. ISIJ Int, 1997; 37: 659[7] Mao B. Contin Cast, 1999; 6: 37(毛斌. 连铸, 1999; 6: 37)[8] Thomas B G, Mika L J, Najjar F M. Metall Mater Trans, 1990; 21B: 387[9] Lei H, Xu G J, He J C. Chem Eng Technol, 2007; 30: 1650[10] Garcia–Hernandez S, Morales R D, Torres–Alonso E. Ironmaking Steelmaking, 2010; 37: 360[11] Zhong D Q, Yu L W. ISIJ Int, 2004; 44: 100[12] Choi S L, Ryu K J, Park H S. Met Mater Int, 2002; 8: 527[13] Wang Y F, Zhang L F. Metall Mater Trans, 2011; 42B: 1319[14] Chaudhary R, Thomas B G, Vanka S P. Metall Mater Trans, 2012; 43B: 532[15] Klaus T, Sven E, Gunter G. Metall Mater Trans, 2011; 42B: 68[16] Qian Z D, Wu Y L. ISIJ Int, 2004; 44: 100[17] Yu H Q, Wang B F, Li H Q, Li J C. J Mater Process Technol, 2008; 202: 179[18] Che Z H, Wang E G, Lei H, He J C. Iron Steel, 2008; 43(8): 25(陈芝会, 王恩刚, 雷洪, 赫冀成. 钢铁, 2008; 43(8): 25)[19] Li B K, Okane T, Umeda T. Metall Mater Trans, 2000; 31B: 1491[20] Timmel K, Eckert S, Gerbeth G, Stefani F, Wondrak T.ISIJ Int, 2010; 50: 1134[21] Wang M, Jia H, Zhang Z Q, Deng K. Shanghai Met, 2011; 33(6): 41(王 敏, 贾 皓, 张振强, 邓 康. 上海金属, 2011; 33(6): 41)[22] Jia H, Wang M , Zhang Z Q, Deng K, Lei Z S, Ren Z M. Shanghai Met, 2012; 34: 53(贾 皓, 王 敏, 张振强, 邓 康, 雷作胜, 任忠鸣. 上海金属, 2012; 34: 53)[23] Brito D, Nataf H C, Cardin P, Aubert J, Masson J P. Exp Fluids, 2001; 31: 653[24] Yu Z, Lei Z S, Jia H H, Jin X L, Ren Z M, Deng K, Zhong Y B. Shanghai Met, 2007; 29(2): 54(于湛, 雷作胜, 贾洪海, 金小礼, 任忠鸣, 邓康, 钟云波. 上海金属, 2007; 29(2): 54)[25] Wang Y, Zhang Z Q, Yu Z, Jia H, Deng K, Lei Z S, Ren Z M. Acta Metall Sin, 2011; 47: 1285(王寅, 张振强, 于 湛, 贾 皓, 邓 康, 雷作胜, 任忠鸣. 金属学报, 2011; 47: 1285) |
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