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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.:

US 5413623 B1

PDFFull Text
Date of Patent:
May. 09, 1995

Filed:

Aug. 25, 1993

Process and apparatus for vacuum degassing molten steel

Applicant:
Inventors:

Kazuo Oonuki, Himeji, JP;

Teruyoshi Hiraoka, Himeji, JP;

Hiroshi Nagahama, Himeji, JP;

Kazuhisa Fukuda, Himeji, JP;

Akira Nobumoto, Himeji, JP;

Takahiro Isono, Himeji, JP;

Atsumi Yamada, Himeji, JP;

Hiroki Gofuku, Himeji, JP;

Assignee:

Nippon Steel Corporation, Tokyo, JP;

Attorney:

Wenderoth, Lind & Ponack

Primary Examiner:

Peter D Rosenberg

Int. Cl.
CPC ...
C21C / ;
U.S. Cl.
CPC ...
75508 ; 75512 ;
Abstract

Molten steel is efficiently vacuum treated in a vacuum treatment vessel provided with a top blow lance capable of injecting oxygen and a gaseous fuel at desired flow rates, respectively, into the molten steel. The blow lance is provided on the top of the vacuum treatment vessel and is supported so as to be freely vertically movable. By spacing the lower end of the top blow lance not more than 2 m from the surface of the molten steel bath and injecting only oxygen onto the molten steel, and spacing the lower end of the top blow lance 1.0 m or more from the surface of the molten steel bath and injecting both oxygen and a gaseous fuel gas onto the molten steel, the temperature of the molten steel is prevented from decreasing during the vacuum treatment and the molten steel is so prevented from depositing on the inside wall of the vacuum treatment vessel. The top blow lance includes an oxygen injection section having a throat and a tapered portion connected to the lower end of the throat, and a plurality of fuel gas supply ports provided in the tapered portion. The throat and tapered portion are coaxial with the axial center line of the lance.

Find Patent Forward Citations

Oonuki, Kazuo. (1995). Process and apparatus for vacuum degassing molten steel (U.S. Patent No. 5413623). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5413623

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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