连铸坯凝固钩形成机理与控制技术综述  

Overview of formation mechanism and control technology of hooks in continuous casting slab

作　　者：李婷婷 杨健 黄福祥 朱克然 裴兴伟 LI Tingting;YANG Jian;HUANG Fuxiang;ZHU Keran;PEI Xingwei(State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Qian,an Iron and Steel Company,Shougang Stock Company,Qian’an 064404,China)

机构地区：[1]上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]首钢股份公司迁安钢铁公司,河北迁安064400

出　　处：《炼钢》2021年第1期44-56,共13页Steelmaking

基　　金：国家自然科学基金钢铁联合研究基金重点支持项目(U1960202);省部共建高品质特殊钢冶金与制备国家重点实验室、上海市钢铁冶金新技术开发应用重点实验室和上海市科学技术委员会资助项目(19DZ2270200)。

摘　　要：对凝固钩的形成机理与控制技术进行了文献综述。凝固钩的研究方法主要有金相观察法和数值模拟法,两者共同加深了对凝固钩形成机理的认识。在铸坯宽面中心、宽面和窄面边缘处凝固钩平均长度要大于其他部位,凝固钩尺寸随着振痕深度的增加而增大。凝固钩的平均长度随钢中碳含量的降低而增大,超低碳钢和低碳钢中凝固钩问题尤为突出。减小凝固钩尺寸的连铸工艺措施有:提高浇铸温度和连铸拉速,采用放热型保护渣、减小保护渣导热系数、适当增大黏度,采用高频小振幅、非正弦振动波形,采用电磁搅拌或电磁制动等。The formation mechanism and control technology of hooks are reviewed in this paper. The research methods of hooks include metallographic observation method and numerical simulation method. Both of them deepen the understanding of formation mechanism of hooks. The average length of hooks at the center of wide surface,edges of wide and narrow surface is larger than that at the other parts of slab,and the sizes of hooks increase with the increase of oscillation mark depth. The average length of hooks increases with the decrease of carbon content in steels,which is particularly prominent in ultra-low carbon steel and low carbon steel. Measures to reduce the size of hooks in continuous casting process are as follows:increasing casting temperature and casting speed,adopting exothermic mold powder,reducing thermal conductivity of mold flux,increasing viscosity appropriately,adopting mold vibration with high frequency,small amplitude and non-sinusoidal waveform,adopting electromagnetic stirring or electromagnetic braking,etc.

关 键 词：连铸坯 凝固钩 形成机理 影响因素 控制技术 

分 类 号：TF777[冶金工程—钢铁冶金]