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:
Jun. 15, 1982
Filed:
Jun. 24, 1980
Applicant:
Inventors:
Shunichi Yuhara, Mito, JP;
Naruo Hasegawa, Mito, JP;
Takashi Nakasuji, Mito, JP;
Norichika Aoki, Atsugi, JP;
Assignee:
Doryokuro Kakunenryo Kaihatsu Jigyodan, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22F / ;
U.S. Cl.
CPC ...
148 / ; 148 / ; 148 123 ;
Abstract
A process for improving decarburization resistance of chrome-molybdenum steel in sodium is provided which comprises subjecting the chrome-molybdenum steel to cold working to attain a working ratio of not less than 5%, thereby forming numerous nuclei for carbide formation in the steel material, and heat-treating the cold-worked steel to form stable, fine carbide particles. Alternatively, by subjecting the steel material to warm working at a temperature of 600.degree. to 750.degree. C., both the working step and the heat treatment step can be accomplished in one step.