A PHYSICAL MODELLING STUDY OF INCLUSION REMOVAL IN TUNDISH USING INERT GAS CURTAIN
Seshadri, Varadarajan; Silva, Carlos Antonio da; Silva, Itavahn Alves da; Araújo Junior, Ely da Silva
http://dx.doi.org/10.4322/tmm.2012.004
Tecnol. Metal. Mater. Min., vol.9, n1, p.22-29, 2012
Abstract
The control and minimization of non-metallic inclusions content in the tundish and in the mold of a continuous casting unit is crucial for ensuring the final quality of the steel cast product. Nonmetallic inclusions of sizes smaller than 15 μm are hard to remove, as they are difficult to float. They are easily carried by the flow of steel melt into the mold and adversely affect the steel cleanliness. It is suggested that a gas curtain made of small bubbles of argon can be used to capture and remove these inclusions in the tundish, thus avoiding their transport into the mold. A 1:3 scale physical model of tundish of the continuous casting unit of ArcelorMittal plant, in Vitória, Brazil, was built to investigate the effects of gas flow, shape and positioning of the gas curtain inside the tundish, on the efficiency of removal of inclusions. The results suggest that the gas bubbling inside the tundish can be effective in inclusion removal. The efficiency is dependent upon the location of argon bubbling.
Keywords
Modelling, Inclusion removal, Tundish
Referências
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2 MIKI, Y.; THOMAS, B. G. Modelling of inclusion removal in the tundish Metallurgical Transactions B, v. 30, n. 4, p. 639-54, 1999.
3 ROGLER, J. P. Modelling of inclusion removal in a tundish by gas bubbling MAS. 2004. 80 p. Thesis (Master of Applied Science) − Ryerson University, Toronto, Canada 2004
4 ROGLER, J. P.; HEASLIP, L. J.; MEHRVAR, M. Inclusion removal in a tundish by gas bubbling. Canadian Metallurgical Quarterly, v. 43, n. 3, p. 407-16, 2004.
5 THOMAS, B. G.; BAI, H. Nozzle clogging tundish: application of computational models. In: PROCESS TECHNOLOGY DIVISION CONFERENCE PROCEEDINGS, 18., 2001, Baltimore, MD. Proceedings... Warrendale, PA: Iron and Steel Society, p. 895-912.
6 ZHANG, L.; PLUSCHKELL, W.; THOMAS, B. G. Nucleation and growth of Alumina inclusions during deoxidation of steel. In: STEELMAKING CONFERENCE, 85., Nashville, 2002. Proceedings... Warredale: Iron and Steel Society, 2002. p. 463-76.
7 WANG, L.; LEE, H. G.; HAYES, H. A new approach to molten steel refining using fine gas bubbles. ISIJ International, v. 36, n. 1, p. 17-24, 1996. http://dx.doi.org/10.2355/isijinternational.36.17
8 WANG, L.; LEE, H. G.; HAYES, H. Prediction of optimum bubble size for inclusion removal from molten steel by flotation. ISIJ International, v. 36, n. 1, p. 7-16, 1996. http://dx.doi.org/10.2355/isijinternational.36.7
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