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:
May. 05, 2009
Filed:
Apr. 21, 2004
Nobusuke Kariya, Kawasaki, JP;
Shusaku Takagi, Fukuyama, JP;
Tetsuo Shimizu, Chiba, JP;
Tetsuya Mega, Sendai, JP;
Kei Sakata, Handa, JP;
Hiroshi Takahashi, Chiba, JP;
Nobusuke Kariya, Kawasaki, JP;
Shusaku Takagi, Fukuyama, JP;
Tetsuo Shimizu, Chiba, JP;
Tetsuya Mega, Sendai, JP;
Kei Sakata, Handa, JP;
Hiroshi Takahashi, Chiba, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
The present invention relates to a high strength hot rolled steel sheet consisting of 0.04 to 0.15% C, 1.5% or less Si, 0.5 to 1.6% Mn, 0.04% or less P, 0.005% or less S, 0.04% or less Al, 0.03 to 0.15% Ti, 0.03 to 0.5% Mo, by mass, and balance of Fe and inevitable impurities, and having a microstructure consisting of ferrite containing precipitates, second phase of bainite and/or martensite, and other phase, wherein the percentage of the ferrite containing precipitates is 40 to 95%, and the percentage of the other phase is 5% or less. For example, the high strength hot rolled steel sheet having a thickness of 1.4 mm shows a tensile strength of 780 MPa or higher, an elongation of 22% or higher elongation, and a hole expansion ratio of 60% or higher, thus the steel sheet is suitable for reinforcing members automobile cabin and crash worthiness members of automobile.