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. 18, 2012
Filed:
Nov. 19, 2008
Dong-shik Min, Seoul, KR;
Chan-soo Park, Seoul, KR;
Young-eun Lee, Seoul, KR;
Hai-chang Cho, Seoul, KR;
Kwang-jung Lee, Seoul, KR;
Sung-hwan Hong, Seoul, KR;
Dong-Shik Min, Seoul, KR;
Chan-Soo Park, Seoul, KR;
Young-Eun Lee, Seoul, KR;
Hai-Chang Cho, Seoul, KR;
Kwang-Jung Lee, Seoul, KR;
Sung-Hwan Hong, Seoul, KR;
Dongbu Metal Co., Ltd., Seoul, KR;
Abstract
Disclosed is a method of producing ultra low phosphorus and carbon ferromanganese having 0.1 wt % or less carbon and 0.03 wt % or less phosphorus. The method includes preparing low carbon silicomanganese having low phosphorus content, preparing molten manganese slag, subjecting the molten manganese slag and the low carbon silicomanganese having low phosphorus content to primary mixing and stirring at a ratio of 70˜72:28˜30 in a ladle, thus producing a metal melt and slag, and subjecting the metal melt separated from the above slag and the molten manganese slag identical to that used in the primary mixing and stirring to secondary mixing and stirring, thus producing slag and a metal melt including 91˜93 wt % manganese, 0.60˜0.85 wt % silicon, 0.05˜0.10 wt % carbon and 0.015˜0.02 wt % phosphorus.