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. 03, 2011
Filed:
Sep. 19, 2006
Nobuyuki Ishikawa, Hiroshima, JP;
Toyohisa Shinmiya, Hiroshima, JP;
Minoru Suwa, Kanagawa, JP;
Shigeru Endo, Hiroshima, JP;
Nobuyuki Ishikawa, Hiroshima, JP;
Toyohisa Shinmiya, Hiroshima, JP;
Minoru Suwa, Kanagawa, JP;
Shigeru Endo, Hiroshima, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A high strength steel plate containing 0.02 to 0.08% C, by mass, and has substantially a two phase microstructure of ferrite and bainite. The ferrite contains precipitates having a particle size of 30 nm or smaller grain size. The steel plate has a yield strength of 448 MPa or higher. A method for manufacturing the high strength steel plate which comprises hot rolling, accelerated cooling and reheating. The accelerated cooling is conducted down to a temperature of 300 to 600° C. at a cooling rate of 5° C./s or higher. The reheating is conducted up to a temperature of 550 to 700° C. at a heating rate of 0.5° C./s or higher.