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:
Oct. 18, 1977
Filed:
Sep. 23, 1976
Applicant:
Inventor:
Aldo Ramacciotti, Rome, IT;
Assignee:
Centro Sperimentale Metallurgico S.p.A., Rome, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21C / ; C21C / ; C21C / ;
U.S. Cl.
CPC ...
75 49 ; 75 53 ; 75 55 ; 75 58 ;
Abstract
Unkilled steel is transferred, substantially without slag, from the refining reactor to a degassing reactor. The pressure in the degassing reactor is reduced to not more than 200 mm. Hg, and calcium carbide is added in a quantity such that calcium added is from 1 to 2 kg. per ton of steel. A vacuum is maintained for 10 to 20 minutes and then released. Preferably, the calcium carbide additive contains 5 to 25% by weight of calcium fluoride.