Process for stirring steel in a ladle with the aid of carbon dioxide
Patent 4891063 Issued on January 2, 1990. Estimated Expiration Date: 
August 8, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 8, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3575695 3729309 Method for treatment of molten steel in a ladle Process for making a steel melt for continuous casting Cleansing of steel by gas rinsing Production of ultra-low phosphorus steel Patent #: 4456477 InventorAssigneeApplicationNo. 229440 filed on 08/08/1988US Classes:75/546, Noble gas or inert gas not otherwise identified75/547Gas compound containing Oxygen (e.g., Carbon monoxide, Carbon dioxide, Water, etc.)ExaminersPrimary: Rosenberg, Peter D.Attorney, Agent or FirmForeign Patent References
International ClassesC21C 005/32C21C 005/34 Foreign Application Priority Data1987-08-12 FRAbstractA killed steel is stirred in a ladle with the aid of gaseous carbon dioxide. Before the beginning of the stirring in the ladle, there is added to the quantity of deoxidizer usually employed, a supplementary quantity of deoxidizer in the molten metal, the rate of supply of carbon dioxide, bearing in mind the capacity of the ladle and the duration of the stirring, remaining less than or equal to the maximum rate of supply corresponding to the oxidation of the supplementary quantity of deoxidizer at the end of the stirring.Other References
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