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The aim of this study was to develop a new method for the application of hot gunning of the protective refractory coating of the tundish. Laboratory trials allowed the definition of the main process parameters and the selection of the most appropriate refractory materials. The design and use of a half scale pilot plant (semi-automatic) highlighted the possibilities for an industrial utilisation of this process. The advantages of this method of tundish coating include the prevention of hydrogen pick-up into the liquid steel, and the reduction of the thermal losses at the beginning of the cast. In contrast to cold coatings, the hot gunned material does not show any mechanical weakness. The ceramic bond is formed during the coating process which promotes a high resistance to erosion during the first minutes of casting. The tundish properties of the protective lining can be optimised if the tundish coating is hot gunned in several successive layers of increasing density. A first layer contributes to an easy skull-removing after casting, a middle layer at a density of 1.6 gives better mechanical properties and a third layer of higher density improves the steel erosion resistance. The simplicity of the pilot plant for hot gunning means that process control by computer is feasible, and the energy cost is virtually the same as the cost for a classical air-gas preheating.

Additional information

Authors: GAUTHY F, Centre de Recherches Métallurgiques, Liege (BE)
Bibliographic Reference: EUR 13165 FR (1991) 69 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-2079-4
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