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:
Nov. 08, 1977
Filed:
Aug. 10, 1976
Applicant:
Inventors:
Takashi Fukui, Minoo, JA;
Takami Ikeda, Nishinomiya, JA;
Assignee:
Sumitomo Metal Industries Limited, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21C / ;
U.S. Cl.
CPC ...
75 60 ; 75 49 ;
Abstract
A process for the vacuum decarburization wherein oxygen gas is blown downward upon the molten steel surface under reduced pressure from a height apart from said steel surface characterized by applying a Laval nozzle having a divergence calculated from the theoretical Mach number which is, in turn, determined by a definite equation as a lance to provide a desired dynamic pressure on said molten steel surface and a desired depth of impression formed in the molten steel. In this process, a cooling medium for cooling the lance with a cooling medium sprayed with water.