Metal treatment – Stock – Ferrous
Reexamination Certificate
2008-01-01
2008-01-01
Yee, Deborah (Department: 1742)
Metal treatment
Stock
Ferrous
C148S649000, C148S333000, C148S334000, C148S335000, C148S336000, C148S654000
Reexamination Certificate
active
07314532
ABSTRACT:
A high-strength forged part is disclosed which comprises a base phase structure, comprising 30% or more of ferrite in terms of a space factor, and a second phase structure, comprising bainite and/or martensite, and retained austenite having an average grain diameter of 5 μm or less and a content represented by 50×[C]<[VγR]<150×[C], wherein [VγR] represents a space factor of the retained austenite (γR) and [C] represents the mass % of C in the forged part. Furthermore, a high-strength forged part is disclosed which comprises a base phase structure, comprising 50% or more of tempered bainite or tempered martensite in terms of a space factor, and a second phase structure, comprising martensite and 3% to 30% retained austenite in terms of a space factor, wherein the portion of the retained austenite and martensite having an aspect ratio of 2 or less is 25% or less in terms of a space factor.
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U.S. Appl. No. 11/290,640, filed Dec. 1, 2005, Ikeda, et al.
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Akamizu Hiroshi
Ikeda Shushi
Makii Koichi
Mukai Yoichi
Sugimoto Koh-ichi
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd).
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yee Deborah
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