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. 06, 2019
Filed:
Jun. 15, 2017
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Hideki Imataka, Tokyo, JP;
Masato Yuya, Tokyo, JP;
Yuya Gyotoku, Tokyo, JP;
Atsushi Kobayashi, Saitama, JP;
Susumu Maeda, Saitama, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
Abstract
A nitrided component has a chemical composition consisting of, by mass percent, C: 0.07-0.14%, Si: 0.10-0.30%, Mn: 0.4-1.0%, S: 0.005-0.030%, Cr: 1.0-1.5%, Mo: ≤0.05% (including 0%), Al: 0.010% or more to less than 0.10%, V: 0.10-0.25%, optionally at least one element selected from Cu: ≤0.30% and Ni: ≤0.25%, [0.61Mn+1.11Cr+0.35Mo+0.47V≤2.30], and the balance of Fe and impurities. P, N, Ti and O among the impurities are P: ≤0.030%, N: ≤0.008%, Ti: ≤0.005%, and O: ≤0.0030%. The nitrided composition is suitable for use as an automobile ring gear. The nitrided component has a surface hardness of 650-900 HV, core hardness being ≥150 HV, effective case depth of ≥0.15 mm, has excellent bending fatigue strength and surface fatigue strength although the content of Mo is as low as ≤0.05% and has a small amount of expansion caused by nitriding.