Metal treatment – Stock – Ferrous
Reexamination Certificate
2008-12-30
2011-12-06
Yee, Deborah (Department: 1733)
Metal treatment
Stock
Ferrous
C148S333000, C148S334000, C148S335000, C148S909000
Reexamination Certificate
active
08070890
ABSTRACT:
The present invention provides an induction-hardened hollow driving shaft that comprises, as a raw material, a steel pipe that contains, by mass %, 0.30 to 0.47% C, 0.5% or less Si, 0.3 to 2.0% Mn, 0.018% or less P, 0.015% or less S, 0.15 to 1.0% Cr, 0.001 to 0.05% Al, 0.005 to 0.05% Ti, 0.004% or less Ca, 0.01% or less N, 0.0005 to 0.005% B and 0.0050% or less O (oxygen) and the balance Fe and impurities and of which Beff defined by an equation (a) or (b) below is 0.0001 or more, wherein a prior austenite grain size number (JIS G0551) after the hardening is 9 or more. Here, in the case of Neff=N−14×Ti/47.9≧0, Beff=B−10.8×(N−14×Ti/47.9)/14 . . . (a), and, in other cases, Beff=B . . . (b). According to the present invention, a hollow driving shaft that is simultaneously provided with excellent cold workability, hardenability, toughness and torsional fatigue strength and can exert stable fatigue lifetime can be obtained and can be widely utilized.
REFERENCES:
patent: 5545267 (1996-08-01), Ochi et al.
patent: 6319337 (2001-11-01), Yoshida et al.
patent: 6602359 (2003-08-01), Ochi et al.
patent: 7316143 (2008-01-01), Kondo et al.
patent: 2004/0099355 (2004-05-01), Toyooka et al.
patent: 1 178 126 (2000-12-01), None
patent: 06-341422 (1994-12-01), None
patent: 07-018330 (1995-01-01), None
patent: 07-090484 (1995-04-01), None
patent: 2000-154819 (2000-06-01), None
patent: 2000-204432 (2000-07-01), None
patent: 2001-240941 (2001-09-01), None
patent: 2001-355047 (2001-12-01), None
patent: 2002-069566 (2002-03-01), None
patent: 2005-060730 (2005-03-01), None
patent: 2005-320575 (2005-11-01), None
patent: WO-01/48258 (2000-12-01), None
Machine-English translation of Japanese patent No. 2005-060730, Matsuzaki Akihiro et al., Mar. 3, 2005.
Machine-English translation of Japanese patent No. 08-073938, Fujioka Yasuhide et al., Mar. 19, 1996.
Kondo Kunio
Kuroda Kouichi
Marshall & Gerstein & Borun LLP
Sumitomo Metal Industries Ltd.
Yee Deborah
LandOfFree
Induction hardened hollow driving shaft does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Induction hardened hollow driving shaft, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Induction hardened hollow driving shaft will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4262206