Ladle refining of steel

C - Chemistry – Metallurgy – 21 – C

Patent

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Details

C21C 7/06 (2006.01) C21C 7/00 (2006.01) C21C 7/064 (2006.01) C21C 7/076 (2006.01)

Patent

CA 2441839

A steel charge and slag forming material is heated in a ladle to form molten steel covered by a slag containing silicon, manganese and calcium oxides. The steel is stirred by injection of an inert gas such as argon or nitrogen to cause silicon/manganese deoxidation and desulphurization to produce a silicon/manganese killed molten steel. Stirring of the molten steel by the inert gas injection while in contact with slag high in calcium oxide generates low free oxygen levels in the steel and desulphurization to sulphur levels below 0.009%. The slag may subsequently be thickened by lime addition to prevent reversion of sulphur back into the steel and oxygen may be injected into the steel to increase its free oxygen content to produce a steel that is readily castable in a twin roll caster.

L'invention porte sur un lit de fusion d'acier et un matériau d'affinage chauffés dans une poche de coulée afin d'obtenir un acier liquide recouvert de scories contenant du silicium, du manganèse et des oxydes de calcium. L'acier est brassé par injection d'un gaz inerte, notamment de l'argon ou de l'azote afin de provoquer la désoxydation du silicium/manganèse et la désulfuration, entraînant ainsi la production d'un acier liquide calmé de silicium/manganèse. Le brassage de l'acier liquide par l'injection de gaz inerte lors du contact avec les scories riches en oxyde de calcium génère des niveaux faibles exempts d'oxygène dans l'acier et la désulfuration afin d'atteindre des niveaux de soufre inférieurs à 0,009 %. Les scories peuvent être épaissies par addition de chaux afin d'éviter que la réversion de soufre dans l'acier et l'oxygène ne soit injectée dans l'acier dans le but d'augmenter sa teneur exempte d'oxygène, ce qui permet d'obtenir un acier prêt au coulage dans une machine de coulée à deux cylindres.

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