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:
Aug. 03, 1982
Filed:
Jan. 19, 1981
Applicant:
Inventors:
Teruoki Watanabe, Kawagoe, JP;
Shunji Kobayashi, Sayama, JP;
Assignee:
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148 166 ; 148 165 ;
Abstract
A gas soft-nitriding method which comprises a step of subjecting iron parts to a gas soft-nitriding treatment in a heat treating furnace at a temperature of approximately 550.degree. C.-620.degree. C. in a mixed atmosphere which comprises, when introduced into the furnace, 10%-30% ammonia gas, 2.5%-4.5% total carbon monoxide, and a balance of N.sub.2 gas or an exothermic gas on a volume basis. Thereby, the iron parts are provided with superior fatigue and wear resistance qualities, while production costs and the cost of the treated parts are substantially reduced.