The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1996
Filed:
Sep. 02, 1994
Leonard M Keilman, Crown Point, IN (US);
William F Flanagan, Jr, Chicago, IL (US);
James E Bradley, Wheatfield, IN (US);
Shankverm R Balajee, Munster, IN (US);
Inland Steel Company, Chicago, IL (US);
Abstract
A method for degassing molten steel comprises the use of a lift gas which includes carbon dioxide. The inventive method includes providing a reaction zone isolated from the ambient atmosphere, and providing a bath of molten steel, at least a portion of which is located in the reaction zone. The pressure is reduced in the reaction zone to a sub-atmospheric pressure. A gas comprising carbon dioxide is supplied to the bath of molten steel in order to vertically circulate the molten steel. The method also preferably includes (a) supplying carbon dioxide, e.g., with a tuyere, to the reaction zone and (b) supplying carbon dioxide to the bath of molten steel, e.g., by gas bubbling or stirring. An apparatus for performing the method steps is also disclosed.