Periodic transient level fluctuations in continuous casting mold of slab
DENG Xiao-xuan1,2，JI Chen-xi1,2，HE Wen-yuan3，YANG Chun-bao3，LUO Yan-zhao1,2，HUANG Cai-de3
（1. Strip Technology Department， Shougang Research Institute of Technology， Beijing 100043， China 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology， Beijing 100043，China 3. Steelmaking Department， Shougang Jingtang United Iron and Steel Co.， Ltd.， Tangshan 063200， Hebei，China）
Abstract：A full scale water modeling combined with industry experiments was carried out to investigate the transient characteristics in the continuous casting mold of slab. The results of water modeling show that the periodic level distortion exists in the traditional slab casting mold. This phenomenon involves about 5 s level distortions of the mold level every 20-30 s. The mold level near the narrow faces raises up but depresses at the quarter location with the maximum surface velocity during this distortion period. The distortion period is defined as the interval between the last distortion-ending to the latest distortion ending. The results also shows that increasing the casting speeds may decrease the distortion periods while raising the SEN depths and angles can promote these periods. Changing these casting parameters could not eliminate the level distortion，however can alter their periods. Furthermore，the effects on level distortion periods decreases from SEN angles，casting speed to SEN depths. The industrial experiments also confirms the existence of the periodic level distortions. Increasing the SEN angles may reduce the slag entrapments caused by the periodic distortions.
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Tanaka H, Kuwatori H, Nishihara R. Analysis of continuous casting powder entrapping phenomena by water-model experiments[J]. Tetsu-To-Hagane, 1992, 78(5): 761[ ]Iguchi M, Yoshida J, Shimizu，Tomoyuki, et al. Model study on the entrapment of mold powder into molten steel[J]. ISIJ Int, 2000, 40(7): 685[ ]包燕平, 朱建强, 蒋伟, 等. 薄板坯结晶器内卷渣现象的研究[J].北京科技大学学报 1999, 21 (6): 530.(BAO Y P, ZHU J Q, JIANG Wei, et al. Water modeling research on slag-entrapment in the mould of thin slab continuous caster[J]. J Univ Sci Technol Beijing, 1999, 21 (6): 530.)[ ] 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[ ]邓小旋, 季晨曦, 崔阳, 等. 吹氩板坯连铸结晶器内钢水流态. 钢铁, 2016, 51(10): 23(DENG Xiao-xuan, JI Chen-xi, CUI Yang, et al. Flow pattern in continuous casting slab mold with argon blowing [J]. Iron and Steel, 2016, 51(10):23.)[ ]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 Xiao-xuan, XIONG Xiao, WANG Xin-hua, 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 Xiao-xuan, XIONG Xiao, WANG Xin-hua, 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.)[ ]陆巧彤, 杨荣光, 王新华, 等. 板坯连铸结晶器保护渣卷渣及其影响因素的研究[J].钢铁,2006, 41 (7): 29.(LU Qiao-tong, YANG Rong-guang, WANG Xin-hua, et al. Water modeling study on factors affecting mold powder entrapment in slab continuous casting[J],Iron and Steel, 2006, 41 (7): 29.)[ ]雷洪, 许海虹, 朱苗勇,等. 高速连铸结晶器内卷渣机理及其控制研究[J].钢铁,1999, 34 (8): 20.(LEI Hong, XU Hai-hong, ZHU Miao-yong, et al. Mechanism and control of slag entrapment in high casting mould [J].Iron and Steel, 1999, 34 (8): 20.)[ ] Wang Y, Zhang L. Fluid flow-related transport phenomena in steel slab continuous casting strands under electromagnetic brake[J]. Metall Mater Trans B, 2012: 1[ ]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[ ] Li B, Okane T, Umeda T. Modeling of molten metal flow in a continuous casting process considering the effects of argon gas injection and static magnetic-field application[J]. Metall Mater Trans B, 2000, 31(6): 1491[ ]王现辉, 王新华, 张炯明, 等.CSP结晶器内钢液面动态失稳现象的水模型实验[J].北京科技大学学报,2009, 31 (2): 234.(Wang Xian-hui, Wang Xin-hua, Zhang Jiong-ming, et al. Water modeling study on the meniscus dynamic distortion of molten steel level in a CSP thin slab casting mould[J]. J Univ Sci Technol Beijing, 2009, 31 (2):234)[ ]王现辉, 王新华, 张炯明, 等.CSP结晶器内卷渣的瞬态特征[J].北京科技大学学报,2009, 31 (6): 764.(Wang Xian-hui, Wang Xin-hua, Zhang Jiong-ming, et al. Transient slag entrapping characteristics in a CSP mould[J]. J Univ Sci Technol Beijing, 2009, 31 (6):764)[ ] Torres-Alonso E, Morales R D, García-Hernández S, et al.Cyclic Turbulent instabilities in a thin slab mold. Part I: physical model [J].Metall Mater Trans B,2010, 41 (3): 583.[ ] Torres-Alonso E, Morales R D, García-Hernández S.Cyclic Turbulent instabilities in a thin slab mold. Part II: mathematical model [J].Metall Mater Trans B,2010, 41 (3): 675.[ ]Kubota J, Okimoto K, Shirayama A, et al. Meniscus Flow Control in the Mold by Traveling Magnetic Field for High Speed Slab Caster [C]// Steelmaking Conference. Washington, D.C.; USA, 1991: 233.[ ]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 Xiao-xuan, Wang Qiang-qiang, Qian Long, et al. Water model optimization of three-port submerged entry nozzle feeding a funnel-shaped thin slab mold. Iron and Steel, 2012, 47(7):26)
2017, Vol. 52 
