Effects of Simultaneous Static and Traveling Magnetic Fields on the Molten Steel Flow in a Continuous Casting Mold
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ng defects such as mold slag infiltration and blow holes have been generally localized on the surface or subsurface of the slab. Iguchi et al.[1] investigated several mechanisms of fluid flow phenomena regarding entrapment of mold slag through particle
SANG-WOO HAN is with the Graduate School of Engineering Mastership, Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, Republic of Korea and also with the Steelmaking Research Group, Technical Research Laboratories Pohang Research Lab, POSCO, Pohang, Gyeongbuk 790-300, Republic of Korea. HYUN-JIN CHO is with the Steelmaking Research Group, Technical Research Laboratories Pohang Research Lab, POSCO. SUN-YONG JIN is with the Steelmaking Department, POSCO, Gwangyang, Jeollanam-do 545-711, Republic of Korea. MARTIN SEDE´N is with the Metallurgy Products, Industrial Automation, ABB AB, Terminalvagen 24, Bldg340, 721 59 Vasteras, Sweden. IN-BEUM LEE is with the Graduate School of Engineering Mastership, Pohang University of Science and Technology. IL SOHN is with the Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea. Contact e-mail: [email protected] Manuscript submitted January 11, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS B
imaging velocimetry of a silicone-oil/salt-water-layered physical model, and concentrated on unsteady shear flow instability. It was considered that the molten steel flow in the mold can determine the slab surface quality, which can be controlled by several casting factors, including the design of the submerged entry nozzle (SEN), argon flow rate, casting conditions, and the availability of electromagnetic stirring. In particular, Doncker and Domgin[2] reported that it is possible to improve the surface quality of the slab by controlling the surface velocity of the molten steel at the meniscus in the mold and minimize inclusion infiltration when an electromagnetic field is applied. Several commercial technologies have been developed that utilize an electromagnetic field in the mold. Electromagnetic stirrers (EMSs) and multimode EMSs (MM-EMSs) are widely applied electromagnetic flow control systems using a traveling magnetic field, which can accelerate, decelerate, or rotate the molten steel in the mold using traveling magnetic fields. Kubota et al.,[3] Kunstreich,[4] and Kubo et al.[5] reported on the operational concept of EMS and MM-EMS using a traveling magnetic field. A rotational flow can be developed, leading to a uniform meniscus temperature by implementing a traveling magnetic field, subsequently improving the slab quality regarding inclusions and cracks. On the other hand, electromagnetic braking (EMBr) and flow-controlling (FC) molds are
representative electromagnetic flow control systems using static magnetic fields. The system decreases the surface velocity of the molten steel in the mold when a static magnetic field is applied, decreasing mold-level fluctuations. According to the review by Sjoden[6] on the performance of EMBr and FC molds, static magnetic fields can ensure a stable meniscus a
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