Steels for high-strength springs excellent in cold...

Details Steels for high-strength springs excellent in cold... Steels for high-strength springs excellent in cold...

2006-02-07

2009-11-17

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S320000, C148S908000, C148S333000, C148S335000, C148S336000

Reexamination Certificate

active

07618498

ABSTRACT:
A steel for high-strength springs contains, on the mass basis, 0.35% to 0.65% of C, 1.4% to 2.5% of Si, 0.1% to 1.0% of Mn, 2.0% or less (exclusive of 0%) of Cr, 1.0% or less (exclusive of 0%) of Ni, 1.0% or less (exclusive of 0%) of Cu, 0.020% or less (exclusive of 0%) of P, 0.020% or less (exclusive of 0%) of S, 0.006% or less (exclusive of 0%) of N:, and 0.1% or less (exclusive of 0%) of Al, with the remainder being iron and inevitable impurities, in which Wp(Fe) and W(C) satisfy the following condition: Wp(Fe)>5×W(C), wherein Wp(Fe) is the content of Fe (percent by mass) constituting Fe-containing precipitates in the steel; and W(C) is the carbon content (percent by mass) of the steel. The steel is excellent in cold workability and quality stability.

REFERENCES:
patent: 3844848 (1974-10-01), Stacey
patent: 5261974 (1993-11-01), Hyodo et al.
patent: 5286312 (1994-02-01), Shimotsusa et al.
patent: 5776267 (1998-07-01), Nanba et al.
patent: 5846344 (1998-12-01), Kawaguchi et al.
patent: 2004/0129354 (2004-07-01), Nagao et al.
patent: 1305020 (2001-07-01), None
patent: 0 372 465 (1990-06-01), None
patent: 0 657 557 (1995-06-01), None
patent: 1 013 780 (2000-06-01), None
patent: 62-196357 (1987-08-01), None
patent: 6-184679 (1994-07-01), None
patent: 6-184697 (1994-07-01), None
patent: 7-173577 (1995-07-01), None
patent: 9-310151 (1997-12-01), None
patent: 10-110247 (1998-04-01), None
patent: 11-199977 (1999-07-01), None
patent: 11-302729 (1999-11-01), None
patent: 11-315347 (1999-11-01), None
patent: 11-315348 (1999-11-01), None
patent: 11-315349 (1999-11-01), None
patent: 2000-45047 (2000-02-01), None
patent: 2000-239797 (2000-09-01), None
patent: 2004-263247 (2004-09-01), None
patent: 2004-360005 (2004-12-01), None
Computer-generated English translation of Japanese patent 11-302729 dated Feb. 11, 1999, Yoshie Atsuhiko.
Computer-generated English translation of Japanese patent 11-315347 dated Nov. 16, 1999, Kako Hiroshi.
U.S. Appl. No. 11/296,299, filed Dec. 8, 2005, Minamida, et al.
U.S.Appl. No. 11/276,842, filed Mar. 16, 2006, Yoshihara.
U.S. Appl. No. 12/160,913, filed Jul. 15, 2008, Kochi, et al.
U.S. Appl. No. 12/097,313, filed Jul. 18, 2008, Yoshihara, et al.
U.S. Appl. No. 12/192,437, filed Aug. 15, 2008, Kochi, et al.

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