摘要
随着连铸技术高效化、大型化的发展,无头轧制技术成为未来连铸技术的发展趋势,而高速连铸正是实现无头轧制的重要前提。然而,目前国内外对于小方坯高速连铸过程的研究还较少。连铸结晶器内钢液流场的合理分布对整个连铸工艺的顺行以及铸坯质量的优劣起着至关重要的作用。以国内某钢厂160 mm×160 mm方坯连铸结晶器为研究对象,采用FLUENT软件进行了系统的数值模拟,研究了拉速、浸入式水口插入深度以及水口内径对结晶器内钢液流动规律的影响,并分别优化出适配高拉速连铸的最佳SEM参数。结果表明,增大拉速会引起结晶器通钢量大幅增加,自由液面变得更加活跃;水口插入深度的增加会引起流场整体下移,自由液面钢液流速大幅减小;SEM内径从40 mm扩大到50 mm后,会导致钢液流场活跃度降低,液面波动趋于平缓,但流股冲击深度变深和回旋区上移。经深入分析和模拟实验发现,在研究条件下,当拉速设定在3~4 m/min、SEN浸入深度为80 mm、SEN内径为50 mm时,能显著优化连铸坯的质量。
With the development of high efficiency and large scale continuous casting technology,headless rolling technology is the development trend of future continuous casting technology,and high-speed continuous casting is an important premise for realizing headless rolling.However,there are few researches on the high drawing speed continuous casting process of billet at home and abroad.The distribution of liquid steel flow field in continuous casting mold is a key link related to the alignment of the entire continuous casting process and the quality of the billet.Therefore,this paper takes the 160 mm×160 mm billet continuous casting mold of a domestic steel plant as the research object,and uses FLUENT software to conduct systematic numerical simulation.The effects of casting speed,insertion depth and inner diameter of the submerged nozzle on the flow of molten steel in the mold were studied,and the best SEM parameters suitable for high casting speed continuous casting were optimized.The results show that with the increase of casting speed,the amount of steel flowing through the mold will increase greatly,and the free liquid surface will become more active.The increase of nozzle immersion depth will cause the overall flow field to move down,and the free liquid surface liquid steel velocity will decrease greatly.When the SEM inner diameter is enlarged from 40mm to 50mm,the flow field activity will decrease,the liquid level fluctuation will be flat,but the impact depth of the flow will become deeper and the rotation zone will move up.Therefore,through the analysis of the simulation results,it can be seen that when the optimal casting speed is 3 m/min to 4 m/min,the SEN immersion depth is 80 mm,and the SEN inner diameter is 50 mm,the quality of continuous casting billet is the most reasonable.
作者
付菁媛
刘宇航
史庆帅
张立民
陈超
刘梦杰
曹磊
Fu Jingyuan;Liu Yuhang;Shi Qingshuai;Zhang Limin;Chen Chao;Liu Mengjie;Cao Lei(Department of Materials Engineering,Hebei Polytechnic University of Industry,Shijiazhuang 050091,Hebei;National Key Laboratory of Green Low-Carbon Steel and Iron Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;School of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei;Hebei HBIS Dahe Equipment Group Co.,Ltd.,Shijiazhuang 050081,Hebei)
出处
《河北冶金》
2025年第6期15-24,52,共11页
Hebei Metallurgy
关键词
连铸
方坯
结晶器
流场
数值模拟
拉速
浸入式水口
continuous casting
billet
crystallizer
flow field
numerical simulation
casting speed
submerged nozzle
