Mechanism of Surface Quality Improvement in Continuous Cast Slab with Rectangular Cold Crucible Mold

The control of the initial stage of solidification for continuous casting of steel is extremely important in producing high surface quality products. The surface quality is strongly influenced by the oscillation mark on the solidifying shell, which could be improved by applying alternating electroma...

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Bibliographic Details
Published in:ISIJ International 1998/07/15, Vol.38(7), pp.723-729
Main Authors: Cho, Young-Whan, Oh, Young-Joo, Chung, Soon-Hyo, Shim, Jae-Dong
Format: Article
Language:English
Subjects:
Applied sciences
cold crucible
continuous casting
Cross-disciplinary physics: materials science
rheology
electromagnetic casting
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
physical modeling
Physics
process control
Solidification
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Summary:The control of the initial stage of solidification for continuous casting of steel is extremely important in producing high surface quality products. The surface quality is strongly influenced by the oscillation mark on the solidifying shell, which could be improved by applying alternating electromagnetic field in the mold. A 50×200 mm rectangular cold crucible mold has been designed by numerical simulation and used for measuring the meniscus contour and local heating of molten metals using tin and lead. It has also been used in continuous casting experiment with Sn and Sn–10%Pb alloy to study the effects of frequency, input power, melt level in the mold, casting speed, mold cooling water flow rate, and mold oscillation frequency on the oscillation mark. The maximum melt temperature was observed near the triple point where the mold wall, melt free surface and the atmosphere meet all together. It has also been found that the local Joule heating density has strong influence on the oscillation mark formation.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.38.723