Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2007-10-18
2010-11-16
Yee, Deborah (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S654000
Reexamination Certificate
active
07833363
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 gain diameter of 5 μm or less and a content represented by 50X[C]<[VγR]<150x[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. 11/910,029, filed Sep. 28, 2007, Akamizu, et al.
Akamizu Hiroshi
Ikeda Shushi
Makii Koichi
Mukai Yoichi
Sugimoto Koh-ichi
(Kobe Steel, Ltd.)
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Yee Deborah
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