Abstract
The slide-gate plates in a cassette assembly control the steel flow through the tundish nozzle, and may experience through-thickness cracks, caused by thermal expansion and/or mechanical constraint, leading to air aspiration and safety concerns. Different mechanisms for common and rare crack formation are investigated with the aid of a three-dimensional finite-element model of thermal mechanical behavior of the slide-gate plate assembly during bolt pretensioning, preheating, tundish filling, casting, and cooling stages. The model was validated with previous plant temperature measurements of a ladle plate during preheating and casting, and then applied to a typical tundish-nozzle slide-gate assembly. The formation mechanisms of different types of cracks in the slide-gate plates are investigated using the model and evaluated with actual slide-gate plates at POSCO. Common through-thickness radial cracks, found in every plate, are caused during casting by high tensile stress on the outside surfaces of the plates, due to internal thermal expansion. In the upper plate, these cracks may also arise during preheating or tundish filling. Excessive bolt tightening, combined with thermal expansion during casting may cause rare radial cracks in the upper and lower plates. Rare radial and transverse cracks in middle plate appear to be caused during tundish filling by impingement of molten steel on the middle of the middle plate that generates tensile stress in the surrounding refractory. The mechanical properties of the refractory, the bolt tightening conditions, and the cassette/plate design are all important to service life.
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Acknowledgments
The authors wish to thank POSCO (Grant No. 4.0009576.01), the Clean Steel and Nonferrous Metals Processing Laboratory at POSTECH, and the Continuous Casting Consortium at the University of Illinois at Urbana-Champaign for financial support. Thanks are also given to Sang-Woo Han – POSCO Technical Research Laboratories, Sung-Kwang Kim – POSCO Gwangyang Works, and to Kwon-Myung Lee – DOOSAN Heavy Industries for supporting plant data.
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Lee, HJ., Thomas, B.G. & Kim, SH. Thermal Stress Cracking of Slide-Gate Plates in Steel Continuous Casting. Metall Mater Trans B 47, 1453–1464 (2016). https://doi.org/10.1007/s11663-015-0582-9
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DOI: https://doi.org/10.1007/s11663-015-0582-9