Flow pattern in continuous casting slab mold with argon blowing
DENG Xiao-xuan1，JI Chen-xi1，CUI Yang1，ZHU Guo-sen2，LI Lin-ping3，SUO Jin-liang3
（1. Strip Technology Department，Shougang Research Institute of Technology，Beijing 100043，China 2. Manufacture Department，Shougang Jingtang United Iron and Steel Co.，Ltd.，Tangshan 063200，Hebei，China 3. School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China）
Abstract：A full scale water modeling and nail-dipping experiments were carried out to investigate the flow patterns in the slab mold with argon blowing. The effects of steel throughputs，argon bubbling flowrates，SEN immersion depths and SEN structures on the flow patterns were discussed. The results show that double roll flow (DRF) and single roll flow(SRF) are the main flow patterns in argon-blowing slab casting mold and the steel throughputs and the argon blowing flowrates are the dominating parameters to determine their modes. To obtain the DRF，promoting the steel throughput，reducing the gas flowrate，narrowing the mold width，increasing the SEN depth and using the mountain-bottom SEN should be conducted. Based on the water modeling results，a critical argon flowrate under different casting combinations was put forward and mountain-bottom should be used in low casting speed/large width dimension condition. Nail dipping measurement results agree well with the water modeling，which show the water modeling results can guide the casting practice to obtain the DRF.
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程常桂, 吴建成, 梅俊学, 等. 连铸坯初始凝固控制技术的发展[J].连铸,2014, 40 (1): 15.CHENG Changgui, WU Jiancheng, MEI Junxue. et al. Development of initial solidification control technology for continuous casting strand[J]. Continuous Casting,2014,40(1):15[ ] 苑鹏, 邓小旋, 姜敏, 等.低碳铝镇静钢铸坯皮下钩状坯壳[J].钢铁,2015, 50 (8): 24.YUAN Peng, DENG Xiaoxuan, JIANG Min.et al. Investigation of subsurface hooks in continuous cast low carbon aluminum-killed steel slab [J]. Iron and Steel. 2015, 50(8): 24.[ ] YOSHIDA J, IGUCHI M, YOKOYA S-I. Water Model Experiment on Mold Powder Entrapment around the Exit of Immersion Nozzle in Continuous Casting Mold[J]. Tetsu-to-Hagane, 2001, 87(8): 529[ ] TESHIMA T, KUBOTA J, SUZUKI M, et al. Influence of Casting Conditions on Molten Steel Flow in Continuous Casting Mold at High Speed Casting of Slabs[J].Tetsu-To-Hagane,1993, 79 (5): 576.[ ] CUKIERSKI K, THOMAS B. Flow Control with Local Electromagnetic Braking in Continuous Casting of Steel Slabs[J].Metall Mater Trans B,2008, 39 (1): 94.[ ] HARADA H, TOH T, ISHII T, et al. Effect of Magnetic Field Conditions on the Electromagnetic Braking Efficiency[J].Trans ISIJ,2001, 41 (10): 1236.[ ] LI L, WANG X, DENG X, et al. Application of High Speed Continuous Casting on Low Carbon Conventional Slab in SGJT[J].Steel Res Int,2014, 85 (11): 1490.[ ] ANDRZEJEWSKI P, KOHLER K U, PLUSCHKELL W. Model Investigations on the Fluid Flow in Continuous Casting Moulds of Wide Dimensions[J].Steel Res,1992, 63 (6): 242.[ ] ANDRZEJEWSKI P, GOTTHELF D, JULIUS E, et al. Mould flow monitoring at no. 3 slab caster, Krupp Hoesch Stahl AG[C]// Steelmaking Conference;1997 153.[ ] KUNSTREICH S, DAUBY P H. Effect of liquid steel flow pattern on slab quality and the need for dynamic electromagnetic control in the mould[J].Ironmaking Steelmaking,2005, 32 (1): 80.[ ] KUBOTA J, OKIMOTO K, SHIRAYAMA A, et al.: Meniscus flow control in the mold by traveling magnetic field for high speed slab caster [C]// 1991 Steelmaking Conference;1991 233.[ ] ASSAR M B, DAUBY P H, LAWSON G D: Opening the black box: PIV and MFC measurements in a continuous caster mold[C]// 83rd Steelmaking Conference;2000 397.[ ] 曹娜,朱苗勇.吹氩板坯连铸结晶器内双循环流的形成条件[J]. 金属学报, 2008. 44(5): 626.CAO N, ZHU M Y. Conditions for formation of a double-recirculation flow pattern in a slab continuous casting mold with argon gas blowing [J]. Acta Metall Sin.2008. 44(5): 626.[ ] 邓小旋, 王强强, 钱龙, 等. 适合漏斗型薄板坯连铸结晶器三孔水口的水模型优化[J].钢铁,2012, 47 (7): 26.DENG Xiaoxuan, WANG Qiangqiang, QIAN Long, et al. Water model optimization of three-port submerged entry nozzle feeding a funnel-shaped thin slab mold[J].Iron Steel,2012,47(7):26.[ ] ZHANG L, YANG S, CAI K, et al. Investigation of Fluid Flow and Steel Cleanliness in the Continuous Casting Strand[J].Metall Mater Trans B,2007, 38 (1): 63.[ ]侯泽旺, 王永胜, 王新华. 板坯结晶器内吹氩工艺研究[J].钢铁钒钛,2011, 32 (1): 41.HOU Zewang, WANG Yongsheng, WANG Xinhua. Study on the water simulation of blowing argon in slab mould[J]. Iron Steel Vanadium Titanium, 2011.32(1):41[ ]邓小旋, 熊霄, 王新华, 等. 水口底部形状对高拉速板坯连铸结晶器液面特征的影响[J]. 北京科技大学学报, 2014, 36(4): 515.Deng Xiaoxuan, Xiong Xiao, Wang Xinhua, et al. Effect of nozzle bottom design on level fluctuation and meniscus velocity in high speed continuous casting mold[J]. J Univ Sci Technol Beijing, 2014, 36(4): 515.[ ]邓小旋, 熊霄, 王新华, 等. 高拉速板坯连铸结晶器浸入式水口的水模型研究[J]. 北京科技大学学报, 2013, 35(10): 1304.Deng Xiaoxuan, Xiong Xiao, Wang Xinhua, et al. Water modeling study on submerged entry nozzles in continuous casting slab mold for high speed casting[J]. J Univ Sci Technol Beijing, 2013.35(10):1304.
2016, Vol. 51 
