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:
Sep. 04, 2018
Filed:
Oct. 01, 2014
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Denso Corporation, Aichi, JP;
Masashi Higashida, Tokyo, JP;
Masato Yuya, Tokyo, JP;
Hitoshi Matsumoto, Tokyo, JP;
Tatsuya Hasegawa, Tokyo, JP;
Yutaka Neishi, Tokyo, JP;
Taizo Makino, Tokyo, JP;
Kouji Morita, Aichi, JP;
Yoshihiro Tanimura, Aichi, JP;
Toshimasa Ito, Aichi, JP;
Tomomitsu Fukuoka, Aichi, JP;
Tadashi Nishiwaki, Aichi, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
DENSO CORPORATION, Aichi, JP;
Abstract
An age-hardenable steel having a composition consisting of: C: 0.05 to 0.20%, Si: 0.01 to 0.50%, Mn: 1.5 to 2.5%, S: 0.005 to 0.08%, Cr: more than 0.50% and not more than 1.6%, Al: 0.005 to 0.05%, V: 0.25 to 0.50%, Mo: 0 to 1.0%, Cu: 0 to 0.3%, Ni: 0 to 0.3%, Ca: 0 to 0.005%, and Bi: 0 to 0.4%, the balance being Fe and impurities. Within the impurities, P≤0.03%, Ti<0.005%, and N<0.0080%, and [C+0.3Mn+0.25Cr+0.6Mo≥0.68], [C+0.1Si+0.2Mn+0.15Cr+0.35V+0.2Mo≤1.05], and [−4.5C+Mn+Cr−3.5V−0.8Mo≥0.12]. The steel has hardness before aging of not more than 310 HV. After aging, the fatigue strength is not less than 480 MPa and absorbed energy at 20° C. is not less than 12 J.