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:
Mar. 30, 1982
Filed:
Dec. 28, 1979
Applicant:
Inventor:
Michel Kostelitz, Versailles, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148 165 ; 148 166 ; 148 167 ;
Abstract
The present invention relates to improvements in processes for treatment of steel under a controlled atmosphere. Use is made of an atmosphere formed by a carrier gas comprising or containing industrially pure nitrogen and by an active gas formed by a hydrocarbon such as: CH.sub.4, C.sub.4 H.sub.10, C.sub.3 H.sub.8, C.sub.2 H.sub.4, C.sub.2 H.sub.2, C.sub.2 H.sub.6, and by carbon monoxide fed in under the form of pure gas or obtained by decomposition of methanol, the treatment being performed between 750.degree. and 1150.degree. C. The invention is applicable to heating prior to hardening, to annealing, to carburization and to carbo-nitriding of steels.