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In the continuous casting of steel it is of essential importance to maintain or even further improve the cleanliness of the melt in the tundish and in the mould. A major deterioration of cleanliness occurs during unsteady operation conditions, e.g. start of casting, ladle change and renewed casting. Unsteady operating conditions have therefore been simulated in scale models of the tundish and mould and the prevailing flow conditions have been investigated. It was found that the flow control devices investigated failed to ensure the positive effect in terms of the particle precipitation initially expected, especially in unsteady operating conditions. Gas injection in the tundish through a porous brick was found to improve the separation of suspended particles. Best results are obtained by arranging the porous brick in the inlet area. The gas supply can be interrupted during ladle change. However, gas should be injected again at renewed casting shortly before opening the ladle discharge nozzle. Contrary to fixed internals, such gas injection devices can be used more flexibly in the tundish as dynamic flow control devices for the process.

Additional information

Authors: NEIFER M, Dusseldorf (DE);ANDRZEJEWSKI P, Dusseldorf (DE)
Bibliographic Reference: EUR 15469 DE (1995) 129 pp., FS, ECU 16.50
Availability: (2)
ISBN: ISBN 92-827-4677-1
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