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. 17, 2008
Filed:
Feb. 24, 2006
Daisuke Suzuki, Kitakyushu, JP;
Hitoshi Matsumoto, Kitakyushu, JP;
Hideki Imataka, Kitakyushu, JP;
Hayato Onda, Wako, JP;
Tetsuya Asai, Wako, JP;
Daisuke Suzuki, Kitakyushu, JP;
Hitoshi Matsumoto, Kitakyushu, JP;
Hideki Imataka, Kitakyushu, JP;
Hayato Onda, Wako, JP;
Tetsuya Asai, Wako, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A hot forged non-heat treated steel for induction hardening, comprising by mass percent, C: 0.35 to 0.45%, Si: 0.20 to 0.60%, Mn: 0.40 to 0.80%, S: 0.040 to 0.070%, Cr: 0.10 to 0.40%, Ti: 0.020 to 0.100%, Ca: 0.0005 to 0.0050%, B: 0.0005 to 0.0030%, O: 0.0015 to 0.0050%, Mo: 0 to 0.05%, P: 0.025% or less, V: 0.03% or less, Al: 0.009% or less and N: 0.0100% or less, and the balance being Fe and impurities, with Fn1=C+(Si/10)+(Mn/5)+(5Cr/22)+1.65V−(5/7S)+1.51×(Ti−3.4N)≦0.63, Ca/O≦1.0, and 25.9×Fn1+27.5×(Ti−3.4N)−7.9≧5.7, has more excellence in the machinability than a conventional steel and also has fatigue strength equal to or more than that of a conventional steel, while using the steel product in a hot forged state as a starting material.