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:
Jul. 29, 1980
Filed:
Mar. 05, 1979
The Japan Steel Works, Ltd., Tokyo, JP;
Abstract
This invention relates to a process for preventing the rephosphorization phenomenon in which, during the production of killed steel in a basic electric furnace, a part of the phosphorus oxide formed and removed in the oxidizing period is reduced in the subsequent deoxidizing period to increase the phosphorus content of the melt again. This process comprises subjecting the melt to oxidizing refinement in the electric furnace, pouring the resulting undeoxidized melt and slag into a ladle, removing the slag of the oxidizing period completely from the melt either by skimming it off or by pouring only the melt into another ladle, and then deoxidizing the melt in the ladle. According to this process, the rephosphorization phenomenon attributable to the residual slag of the oxidizing period adhering to the wall surfaces of the furnace and/or the phosphorus pentoxide (P.sub.2 O.sub.5) absorbed in the lining during the oxidizing period can be prevented to a substantially complete degree, as contrasted with the conventional process in which both oxidizing and deoxidizing steps are carried out in an electric furnace.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile