Production method for low carbon molten steel using vacuum...

C - Chemistry – Metallurgy – 21 – C

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C21C 7/10 (2006.01)

Patent

CA 2163893

In a vacuum degassing and decarburization treatment, the present invention uses a CO2 gas as a recirculating gas and as a stirring gas without inviting stoppage of decarburization and an increase in the carbon concentration and moreover, without an increase in the amount of addition of an alloy, and can reduce the gas cost. The present invention provides a production method for a low carbon molten steel which comprises blowing a CO2 gas from the start of degassing treatment till the carbon concentration of the molten steel reaches 50 ppm in vacuum degassing and decarburization treatment of the molten steel, and thereafter blowing an Ar gas.

L'invention est capable de réduire le coût du gaz dans une technique de dégazage et de décarburation sous vide à l'aide de CO2 comme gaz de reflux et d'un gaz d'agitation sans provoquer l'arrêt de la décarburation, ou une augmentation de la concentration de carbone, ainsi qu'une augmentation de la quantité d'addition d'un aléage. L'invention concerne également un procédé de production d'acier fondu à faible teneur en carbone selon une technique de dégazage et de décarburation, comprenant les étapes consistant à insuffler du CO2 dans un four à partir du temps du départ du dégazage jusqu'au temps d'obtention d'une concentration de carbone de 50 ppm dans l'acier fondu, dans une technique de dégazage et de décarburation sous vide de l'acier fondu, et ensuite à utiliser un gaz Ar.

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