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:
Sep. 16, 1986
Filed:
Mar. 29, 1984
Ronald D Gray, Bethel Park, PA (US);
Michael A Orehoski, Duquesne, PA (US);
Pennsylvania Engineering Corporation, Pittsburgh, PA (US);
Abstract
A method of making steel having low levels of carbon, nitrogen, phosphorous and oxygen comprises the steps of vacuum reladling a ladle of low phosphorous steel for reducing carbon levels and separating the metal from a highly oxidizing slag, blowing oxygen into the metal contained in a teeming ladle at a vacuum pressure and simultaneously bubbling an inert gas through the metal for removing additional carbon and elevating the temperature of the metal, discontinuing the oxygen blow while maintaining the vacuum pressure and continuing the delivery of inert gas for removal of nitrogen. A desulphurizing agent may be delivered prior to the oxygen blow and alloying additions may be made as required.