Metal treatment – Stock – Ferrous
Reexamination Certificate
2005-11-23
2008-09-30
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S333000, C148S334000, C148S335000, C148S336000, C148S908000
Reexamination Certificate
active
07429301
ABSTRACT:
Disclosed herein is an ultra clean spring steel which contains inclusions easily elongated and broken into fine particles by hot rolling and which is easily adaptive to cold rolling and yields springs excelling in fatigue characteristics. The spring steel is characterized in that the wire contains oxide inclusions with a sulfur concentration no more than 10 mass % such that no less than 70% (in terms of numbers) of such inclusions, which exist in the outer layer outside one quarter of the diameter of the wire and have a width no smaller than 3 μm, satisfies the formula (1) below,in-line-formulae description="In-line Formulae" end="lead"?CaO+Al2O3+SiO2+MnO+MgO>80 (mass %) . (1)in-line-formulae description="In-line Formulae" end="tail"?
REFERENCES:
patent: 6328820 (2001-12-01), Yamamoto et al.
patent: 1 010 769 (2000-06-01), None
patent: 6-74484 (1994-09-01), None
patent: 6-74485 (1994-09-01), None
patent: 06-306542 (1994-11-01), None
patent: 7-6037 (1995-01-01), None
patent: 2654099 (1997-05-01), None
patent: 2002-167647 (2002-06-01), None
patent: 2000-0047935 (2000-07-01), None
Computer-generated English translation of Japanese patent 06158226 dated Jul. 6, 1994, Koyasu Yoshiro.
“Recent Development of Production Technology for Super-clean Wire Rod, The 126th and 127th Nishiyama Memorial Technical Lecture”, ed. by The Iron and Steel Institute of Japan, Tokyo, 1988, pp. 145-165 (with partial English translation).
Patent Abstracts of Japan, JP 06-145895, May 27, 1994.
Patent Abstracts of Japan, JP 06-158226, Jun. 7, 1994.
Patent Abstracts of Japan, JP 04-006211, Jan. 10, 1992.
Patent Abstracts of Japan, JP 02-034748, Feb. 5, 1990.
Sakamoto Koichi
Suda Sumie
Sugimura Tomoko
Yoshida Atsuhiko
(Kobe Steel, Ltd.)
Yee Deborah
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