Metal treatment – Stock – Carburized or nitrided
Reexamination Certificate
2008-09-09
2008-09-09
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Carburized or nitrided
C148S319000, C148S333000, C148S334000, C148S335000, C148S328000, C148S906000, C148S218000, C148S225000, C148S567000, C148S573000, C148S575000, C148S586000, C148S663000, C384S912000
Reexamination Certificate
active
11235425
ABSTRACT:
There is provided an inexpensive rolling element used under high interface pressure such as induction hardened gears, the rolling element being improved in the seizure resistance of its tooth flanks and having a temper hardness of HRC 50 or more at 300° C. To this end, the rolling element is made from a steel material containing at least 0.45 to 1.5 wt % C and one or more alloy elements selected from 0.1 to 0.5 wt % V and 0.3 to 1.5 wt % Cr, and has a rolling contact surface layer having a structure tempered at low temperature in which 2 to 18% by volume cementite disperses in a martensite parent phase formed by induction heating and cooling and containing 0.25 to 0.8 wt % carbon solid-dissolving therein.
REFERENCES:
patent: 3663314 (1972-05-01), Monma et al.
patent: RE28523 (1975-08-01), Hill et al.
patent: 3929523 (1975-12-01), Kinoshi et al.
patent: 4162157 (1979-07-01), Parker et al.
patent: 4992111 (1991-02-01), Yamada et al.
patent: 5085733 (1992-02-01), Mitamura
patent: 5131965 (1992-07-01), McVicker
patent: 5338377 (1994-08-01), Mitamura et al.
patent: 5413643 (1995-05-01), Murakami e al.
patent: 5725690 (1998-03-01), Ochi et al.
patent: 5906691 (1999-05-01), Burnett et al.
patent: 6171414 (2001-01-01), Mitamura et al.
patent: 6224688 (2001-05-01), Takemura et al.
patent: 6258179 (2001-07-01), Takayama et al.
patent: 6309475 (2001-10-01), Takayama et al.
patent: 6413328 (2002-07-01), Takayama et al.
patent: 6540847 (2003-04-01), Beswick
patent: 6899774 (2005-05-01), Takayama et al.
patent: 7083688 (2006-08-01), Asano et al.
patent: 2002/0029597 (2002-03-01), Choe et al.
patent: 2002/0112787 (2002-08-01), Asano et al.
patent: 2004/0035499 (2004-02-01), Takayama et al.
patent: 2004/0047757 (2004-03-01), Takayama et al.
patent: 2004/0256029 (2004-12-01), Takayama et al.
patent: 2005/0051240 (2005-03-01), Takayama et al.
patent: 2005/0241734 (2005-11-01), Takayama et al.
patent: 2005/0247377 (2005-11-01), Takayama et al.
patent: 2006/0016519 (2006-01-01), Takayama et al.
patent: 1380435 (2002-11-01), None
patent: 0950723 (1999-10-01), None
patent: 4823617 (1973-03-01), None
patent: 49-7117 (1974-01-01), None
patent: 55-12177 (1977-01-01), None
patent: 57-16186 (1977-03-01), None
patent: 57-19183 (1978-03-01), None
patent: 54-10923 (1979-05-01), None
patent: 54-23329 (1979-08-01), None
patent: 54-124816 (1979-09-01), None
patent: 54-143715 (1979-11-01), None
patent: 55-2789 (1980-01-01), None
patent: 55-12184 (1980-03-01), None
patent: 57-10177 (1982-02-01), None
patent: 57-89424 (1982-06-01), None
patent: 57-174434 (1982-10-01), None
patent: 5-59427 (1984-03-01), None
patent: 59-107066 (1984-06-01), None
patent: 59-136451 (1984-08-01), None
patent: 60-5854 (1985-01-01), None
patent: 360162726 (1985-08-01), None
patent: 60-215743 (1985-10-01), None
patent: 61-9555 (1986-01-01), None
patent: 62-218542 (1987-09-01), None
patent: 64-4459 (1989-01-01), None
patent: 5-32462 (1989-07-01), None
patent: 2-175836 (1990-07-01), None
patent: 402185954 (1990-07-01), None
patent: 03-061348 (1991-03-01), None
patent: 7-74380 (1991-10-01), None
patent: 05-078781 (1993-03-01), None
patent: 3227730 (1993-03-01), None
patent: 6-017224 (1994-01-01), None
patent: 406025736 (1994-02-01), None
patent: 8-3629 (1996-01-01), None
patent: 08-073929 (1996-03-01), None
patent: 08-104924 (1996-04-01), None
patent: 8-109435 (1996-04-01), None
patent: 9-111403 (1997-04-01), None
patent: 9-111405 (1997-04-01), None
patent: 10-176219 (1998-06-01), None
patent: 10-259470 (1998-09-01), None
patent: 11-117059 (1999-04-01), None
patent: 11-222627 (1999-08-01), None
patent: 2000-204464 (2000-07-01), None
patent: 2000-265241 (2000-09-01), None
patent: 402173241 (2000-09-01), None
patent: 2000-301458 (2000-10-01), None
patent: 2002-030344 (2002-01-01), None
patent: 2002-121645 (2002-04-01), None
patent: 2002-180183 (2002-06-01), None
patent: 2003-027181 (2003-01-01), None
patent: 2003-328078 (2003-11-01), None
patent: 2004-076125 (2004-03-01), None
“Heat Treatment of Steel” (5thEdition) Edited by: The Iron and Steel Institute of Japan, Publ. Office: Maruzen Co., Ltd., Mar. 15, 1985, pp. 44 to 46 and 110.
Brick et al., “Structure and Properties of Engineering Materials,” Martensite Transformation in Iron-Carbon Alloys, 4th Edition, (1978), pp. 152-154.
“Heat Treatment of Steel” (5th Edition) Edited by: The Iron and Steel Institute of Japan, Publ. Office: Maruzen Co., Ltd., Mar. 15, 1985.
K. Komine et al., On Relationship Between Half Value Breadth and Hardness of Quenched-Tempered Steels; Materials vol. 26, No. 280, P26 issued by Society of Materials, Japan, pp. 24-30, Jun. 21, 1976.
J. R. Davis, “ASM Metals Handbook”, Second Edition, (1998).
Furumoto Masanari
Morioka Noriko
Nakao Chikara
Takayama Takemori
Frishauf Holtz Goodman & Chick P.C.
Komatsu Ltd.
Yee Deborah
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