Metal treatment – Stock – Ferrous
Reexamination Certificate
2008-07-01
2008-07-01
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S334000, C148S335000, C148S320000, C148S590000, C148S593000, C148S651000, C148S659000, C148S909000, C384S912000
Reexamination Certificate
active
07393420
ABSTRACT:
Steel tubes for bearing element parts according to the present invention, wherein the specific compositions are limited and an accumulation intensity of {211} face along with an impact property at ambient temperature in the longitudinal direction of steel tube are specified, can be provided as a source material for bearing element parts, which have excellent machinability and fatigue life in rolling contact, being incorporated without adding a free-cutting element specifically nor without reducing productivity since the spheroidizing for the same annealing duration with that of conventional spheroidizing treatment can be applied. Accordingly, by applying a manufacturing method or a cutting-machining method according to the present invention, bearing element parts such as races, rollers and shafts can be produced with less cost and efficiently.
REFERENCES:
patent: 6162390 (2000-12-01), Bellus et al.
patent: 01-255651 (1989-10-01), None
patent: 03-056641 (1991-03-01), None
patent: 09-227991 (1997-09-01), None
patent: 10-183243 (1998-07-01), None
patent: 2001-049388 (2001-02-01), None
patent: 2001-294972 (2001-10-01), None
patent: 2002-275584 (2002-09-01), None
English abstract of Japanese patent 411325058, Yuji Nakamura et al. Nov. 26, 1999.
Computer-generated English translation of Japanese patent 2001-294972 , Ofuji Yoshihiro, Oct. 26, 2001.
Computer-generated English translation of Japanese patent 10-183243, Kitano Shuhei, Jul. 14, 1998.
Daito Yoshihiro
Nakashima Takashi
Clark & Brody
Sumitomo Metal Industries Ltd.
Yee Deborah
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