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. 23, 2015
Filed:
Mar. 08, 2012
Naoyuki Sano, Takarazuka, JP;
Masayuki Horimoto, Nishinomiya, JP;
Yoshinari Okada, Utsunomiya, JP;
Masaki Amano, Utsunomiya, JP;
Akihito Ninomiya, Utsunomiya, JP;
Naoyuki Sano, Takarazuka, JP;
Masayuki Horimoto, Nishinomiya, JP;
Yoshinari Okada, Utsunomiya, JP;
Masaki Amano, Utsunomiya, JP;
Akihito Ninomiya, Utsunomiya, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
Abstract
A method for producing a carbonitrided member comprising the steps of carburizing a steel part having a composition of, by mass percent, C: 0.10 to 0.35%, Si: 0.15 to 1.0%, Mn: 0.30 to 1.0%, Cr: 0.40 to 2.0%, S: 0.05% or less with the balance being Fe and impurities in a carburizing atmosphere of 900 to 950° C. The carburized steel part is carbonitrided in a carbonitriding atmosphere with the temperature of 800 to 900° C. and the nitrogen potential of 0.2 to 0.6%. The carbonitrided steel part is qhenched and then shot peened. The shot peening treatment may be further performed while heating to a temperature not higher than 350° C. or immediately after heating to a temperature not higher than 350° C. After quenching, the shot peening treatment may be further performed after tempering in the temperature range exceeding 250° C. and not higher than 350° C.