Method of refining of high purity steel

C - Chemistry – Metallurgy – 21 – C

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C21C 7/068 (2006.01) C21C 7/10 (2006.01)

Patent

CA 2086193

Disclosed is a method of refining of a high purity steel capable of effectively lowering impurities in molten steel into respective ultra-low ranges. In secondary refining for molten steel after a molten iron prerefining process and a converting process, a reducing agent and a flux are added on the bath surface within a ladle containing the molten steel decarburized in a converter so that the composition of slag on the bath surface is adjusted in such a manner that the total concentration of FeO and MnO becomes 5wt% or less, and subsequently, impurities in the molten steel are effectively lowered into respective ultra-low ranges using a RH vacuum degassing unit.

Une méthode est proposée pour l'affinage d'un acier à haute pureté. La méthode proposée serait susceptible d'abaisser effectivement la teneur en impuretés de l'acier en fusion à des niveaux ultra-bas. Après une étape de préraffinage, un affinage secondaire de l'acier en fusion et un procédé de cémentation, un agent réducteur et un fondant sont ajoutés à la surface du bain à l'intérieur d'une poche de coulée contenant l'acier en fusion décarburé dans un convertisseur, de sorte que la composition du laitier à la surface du bain est contrôlée au point où la concentration totale de FeO et de MnO est réduite à 5 % en poids ou moins, et que la teneur en impuretés est réduite à des niveaux ultra-bas à l'aide d'un ensemble de dégazage rH.

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