Analysis of comprehensive physical and chemical properties of medium and high carbon steel mold flux in thin slab
WANG Zi-chao1, ZENG Jie1, DOU Kun1, WANG Wan-lin1, LIN Hong-liang2, LIU Xiao-kang2
1. School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan,China; 2. Guangdong Guangqing Metal Technology Co., Ltd., Guangdong High-end Stainless Steel Research Institute,Yangjiang 529533, Guangdong, China
Abstract:Thin slab continuous casting has high casting speed and fast cooling speed, which is a more prominent problem in the production of medium and high carbon steel with high carbon content compared with traditional continuous casting. Developing the matching mold flux is the premise to ensure the smooth production process of medium and high carbon steel in thin slab continuous casting and the qualified slab quality. According to the process characteristics of thin slab continuous casting and the characteristics of medium and high carbon steel grades, the requirements of physical and chemical properties of mold flux for medium and high carbon steel production in thin slab continuous casting are summarized. At the same time, the physical and chemical properties of mold flux A and mold flux B used for continuous casting of medium and high carbon steel in thin slab were characterized and evaluated. The results show that the heat transfer ability and lubricating ability of mold flux B are better than those of mold flux A, which can ensure the lubricating effect of the casting billet and accelerate the heat transfer of molten steel in the mold, forming a solidified billet shell with a certain thickness. In addition, mold flux B has low viscosity and melting temperature, fast melting rate, and good viscosity and melting performance. Therefore, mold flux B can better meet the production requirements of medium and high carbon steel in thin slab continuous casting.
王子超, 曾杰, 窦坤, 王万林, 林鸿亮, 刘小钪. 薄板坯中高碳钢保护渣综合理化性能的分析[J]. 连铸, 2023, 42(3): 27-32.
WANG Zi-chao, ZENG Jie, DOU Kun, WANG Wan-lin, LIN Hong-liang, LIU Xiao-kang. Analysis of comprehensive physical and chemical properties of medium and high carbon steel mold flux in thin slab. CONTINUOUS CASTING, 2023, 42(3): 27-32.
KLINKENBERG C, KINTSCGER B, HOEN K, et al. More than 25 years of experience in thin slab casting and rolling current state of the art and future developments[J]. Steel Research International, 2017, 88(10): 1700272.
ZHOU T,ZHANG P,KUUSKMAN K, et al. Development of medium-to-high carbon hot-rolled steel strip on a thin slab casting direct strip production complex[J]. Ironmaking and Steelmaking, 2018, 45(7): 603.
[20]
HOEN K,KLEINC,STEPHAN S, et al. Recent development of thin slab casting and rolling technology in a challenging market[J]. BHM Berg-und Hüttenmännische Monatshefte, 2016, 161(9): 415.
[21]
毛新平,高吉祥,柴毅忠. 中国薄板坯连铸连轧技术的发展[J].钢铁,2014,49(7):49.
[22]
MUNTIN A V. Advanced technology of combined thin slab continuous casting and steel strip hot rolling[J]. Metallurgist, 2019, 62(9/10): 900.
NAKADA H, SUSA M, SEKO Y, et al. Mechanism of heat transfer reduction by crystallization of mold flux for continuous casting[J]. ISIJ International, 2008, 48(4): 446.