The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 2010
Filed:
Oct. 18, 2007
Shushi Ikeda, Kobe, JP;
Koichi Makii, Kobe, JP;
Hiroshi Akamizu, Kobe, JP;
Yoichi Mukai, Kakogawa, JP;
Koh-ichi Sugimoto, Ueda, JP;
Shushi Ikeda, Kobe, JP;
Koichi Makii, Kobe, JP;
Hiroshi Akamizu, Kobe, JP;
Yoichi Mukai, Kakogawa, JP;
Koh-ichi Sugimoto, Ueda, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
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]<[V]<150x[C], wherein [V] 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.