Numerical Simulation of Turbulent Steel Cem? Mold Under High Mass Flow Condition

9th International Symposium on Electromagnetic Processing of Materials

材料科学;物理学

Hwang, J.Y.^1 ; Cho, M.J.^1 ; Thomas, B.G.^2 ; Cho, S.M.^2

Research Laboratory, POSCO, 20-26, Pokposarang-gil, Kwangyang, Korea, Republic of^1

Colorado School of Mines, 1500 Illinois St., Golden

CO

80401, United States^2

关键词: Advanced technology;    Casting and rolling;    Casting operations;    Casting technology;    Critical technologies;    Evaluation and improvement;    Numerical and experimental study;    Steel manufacturing process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/424/1/012033/pdf
DOI  :  10.1088/1757-899X/424/1/012033

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The POSCO has invented one of the most innovated steel manufacturing process called CEM® (Compact Endless casting & rolling Mill) which can continuously produce coils without cutting before the finishing mill. In this high throughput process between the casting and rolling processses, a material balance is essential. World-class throughput of CEM® has been achieved with high-speed casting technology (up to 8.0 m/min) and increased slab thickness (up to 100 mm). Many new advanced technologies are required to do this. For instance, instability of the meniscus in the mold is one of the important factors to be solved. Electro Magnetic Braking (EMBr) system has come into the spotlight to control mold surface profile and level fluctuations. Therefore, an accurate evaluation and improvement of EMBr is required. In this work, a numerical and experimental study was carried out to investigate high throughput conditions, to prepare for the next generation of CEM®. In order to effectively stabilize mold flow near the meniscus, a new SEN was designed, combined with a U-shaped EMBr invented by POSCO. The effect of EMBr current on the temperature in the mold is also studied. Numerical results are consistently agreed with plant measurements obtained using nail board tests. Stabilized mold level and temperature are the critical technologies needed to achieve stable casting operation.