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:
Sep. 17, 2013
Filed:
May. 11, 2010
Noriaki Kohsaka, Tokyo, JP;
Kazuhiro Seto, Chiba, JP;
Reiko Sugihara, Chiba, JO;
Masahide Watabe, Chiba, JP;
Yasushi Tanaka, Tokyo, JP;
Noriaki Kohsaka, Tokyo, JP;
Kazuhiro Seto, Chiba, JP;
Reiko Sugihara, Chiba, JO;
Masahide Watabe, Chiba, JP;
Yasushi Tanaka, Tokyo, JP;
JFE Steel Corporation, , JP;
Abstract
A steel sheet contains, on a mass percent basis, 0.03%-0.12% C, 0.5% or less Si, 0.8%-1.8% Mn, 0.030% or less P, 0.01% or less S, 0.005%-0.1% Al, 0.01% or less N, 0.035%-0.100% Ti, and the balance being Fe and incidental impurities and has microstructures with a fraction of polygonal ferrite of 80% or more, the polygonal ferrite having an average grain size of 5 to 10 μm. The amount of Ti present in a precipitate having a size of less than 20 nm is 70% or more of the value of Ti* calculated using expression (1):Ti*=[Ti]−48×[N]/14  (1)