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Abstract The SEN is frequently clogged by high melting point Al2O3 inclusions when the ultra low carbon steel is casted in Hanbao steelmaking plant. The SEN clogging can lead to large amount of liquid level fluctuation�� which cause stopper plugging up�� and finally the SEN is forced to replace in order to maintain production. In order to reduce and avoid larger amount of liquid level fluctuation�� SEN clogging�� it mainly adopted adding to tundish wall�� dam and current regulator�� increasing the staneling teme of liquid steel in the tundish to improve the floating of incllusions�� detecting upper nozzle permeability before using�� chucking away foreign matter in the tundish before baked to avoid SEN clogging due to the inclusions�� checking kinds of pipeline permeability and stopper mechanism flexibility�� adjusting reasonably flow and pressure of nozzle argon and stopper argon according to the mold surface active state at casting. Through taking these measures under normal condition of casting equipments and steel purity�� amount of liquid level fluctuation and SEN clogging rate had effectively reduced�� and it didn��t needs replace SEN in six casting. Slab quality was improved.
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Received: 11 July 2014
Published: 13 January 2016
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2015, Vol. 40 
