Abstract
A moving weir to reduce the time for grade transition is proposed. To investigate benefits of the proposed moving weir, tundish flow subject to various conditions of a moving weir was numerically investigated. First, an optimal travelling path of a horizontally moving weir was determined in a water model. Investigation of various cases shows that the shortest transition time is obtained when new molten steel is injected after the weir returns to its original position after a round-trip. Using this travelling path, the speed of the moving weir was investigated in a real-scale model to determine an optimal speed that stabilizes the surface height while the transition time is minimized. As a result, intermixing of steel with dissimilar grades has been reduced by 14.5 % by using the optimal conditions of the moving weir. Lastly, the performance of vertically moving weirs was assessed by comparing with that of the horizontal counterpart.
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This work was supported by POSCO under the Steel Science Project (2017Y011).
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Soohwan Jeon received his B.S. in Mechanical Engineering from Inha University. He is an integrated M.S./Ph.D. student at Pohang University of Science and Technology (POSTECH).
Sangseoung Lee received his B.S. and Ph.D. in Mechanical Engineering from Pohang University of Science and Technology. He is a Post-Doctoral Scholar at Pohang University of Science and Technology (POSTECH).
Sanghyun Ha received his B.S. in Pohang University of Science and Technology and is an integrated M.S./Ph.D. student at Pohang University of Science and Technology (POSTECH).
Sungjool Kim received his B.S. and M.S. in Mechanical Engineering from Busan National University. He is a Ph.D. student at Pohang University of Science and Technology and a researcher at POSCO.
Donghyun You is a Professor of Mechanical Engineering at Pohang University of Science and Technology (POSTECH).
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Jeon, S., Lee, S., Ha, S. et al. Effects of a moving weir on tundish flow during continuous-casting grade-transition. J Mech Sci Technol 35, 4001–4009 (2021). https://doi.org/10.1007/s12206-021-0813-8
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DOI: https://doi.org/10.1007/s12206-021-0813-8