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. 12, 1980
Filed:
May. 02, 1977
Applicant:
Inventors:
Mans K Johnsson, Hagfors, SE;
Lars A Eriksson, Hagfors, SE;
Assignee:
Uddeholms Aktiebolag, Uddeholms, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21C / ;
U.S. Cl.
CPC ...
75 60 ; 75 59 ;
Abstract
The carbon content in iron, cobalt, or nickel based alloys containing at least about 16% chromium is substantially eliminated without significant loss of chromium by blowing the alloy with oxygen to oxidize the carbon and simultaneously introducing steam or ammonia in amounts such that the partial pressure of carbon monoxide (formed by oxidation of carbon) is lower than that which corresponds to the equilibrium pressure for the carbon/chromium oxidation e.g. below 0.95 and preferably below 0.5 atmospheres.