23-04-2015 дата публикации
Номер: US20150107797A1
Принадлежит:
In an electric arc furnace system for making steel, a method and structure (1) for eliminating teeming hang-ups and ensuring temperature homogeneity in a ladle which teems into an ingot mold by gas purging at all possible steps under both atmospheric and vacuum conditions, and (2) for preventing non-metallic inclusions from appearing in the final product by deflecting the granular material in the teeming ladle well block away from the ingot mold by a heat resistant but combustible deflector just prior to entry of the teeming stream into the ingot mold. 1. In a multi-station system for producing very pure alloy steel , said system having a single electric arc furnace , a ladle metallurgical furnace and vacuum degassing means , a method comprising the steps ofproviding receptacle means for receiving a heat from the electric furnace,passing an inert gas upwardly through the heat as the heat is tapped from the electric furnace into the receptacle means,moving the heat which has been subjected to the inert gas during tapping to the ladle metallurgical furnace,passing an inert gas upwardly through the heat while said heat is subjected to treatment in the ladle metallurgical furnace, and thereafter, following ladle metallurgical furnace treatment of the heat,subjecting the heat to the combined effect of vacuum and an inert gas in the vacuum degassing means, andthereafter teeming the heat.2. In the method of claim 1 , the further step ofshrouding the teeming stream as the heat is teemed.3. The method of further characterized in that the teeming stream is teemed into a bottom pour teeming system having trumpet means.4. The method of further characterized in thatthe teeming stream is isolated from ambient atmosphere during teeming by passing the teeming stream through shroud means which makes contact, at its bottom, with the top of the trumpet means, and, at its top, with the bottom of receptacle means holding the heat to be teemed,the space contained within the bottom of the ...
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