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:
Feb. 19, 1991
Filed:
Jul. 18, 1989
Applicant:
Inventors:
Kazuhisa Hamagami, Chiba, JP;
Masayuki Onishi, Chiba, JP;
Assignee:
Kawasaki Steel Corporation, Kobe, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21C / ;
U.S. Cl.
CPC ...
75508 ;
Abstract
A process of production of high cleanness extra low carbon steel includes steps of producing low carbon rimmed steel by means of a refining furnace, supplying a deoxidization agent to a slag in a laddle for adjusting iron concentration in slag at lower than or equal to 5%, subsequently performing vacuum degassing process with blowing oxygen to lower carbon content in the steel lower than or equal to 0.006%.