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:
Oct. 28, 2003
Filed:
Mar. 18, 2003
Applicant:
Inventors:
Tetsuo Mochida, Chiba, JP;
Kazuhiro Seto, Chiba, JP;
Kei Sakata, Chiba, JP;
Tomohisa Oonishi, Chiba, JP;
Assignee:
Kawasaki Steel Corporation, Kobe, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 8/00 ; C22C 3/804 ; C22C 3/812 ; C22C 3/814 ;
U.S. Cl.
CPC ...
C21D 8/00 ; C22C 3/804 ; C22C 3/812 ; C22C 3/814 ;
Abstract
A cold-rolled steel sheet having an ultrafine grain structure including a ferrite phase provided. The cold-rolled steel sheet contains C, Si, Mn, Ni, Ti, Nb, Al, P, S, N and Fe and incidental impurities. The ferrite phase has a content of 65 percent by volume or more and an average grain size of 3.5 &mgr;m or less.