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:
Dec. 03, 2013
Filed:
Dec. 17, 2009
Shushi Ikeda, Kobe, JP;
Yoichi Mukai, Kakogawa, JP;
Hiroshi Akamizu, Kobe, JP;
Koichi Makii, Kobe, JP;
Koichi Sugimoto, Ueda, JP;
Shunichi Hashimoto, Minato, JP;
Kenji Saito, Kobe, JP;
Shushi Ikeda, Kobe, JP;
Yoichi Mukai, Kakogawa, JP;
Hiroshi Akamizu, Kobe, JP;
Koichi Makii, Kobe, JP;
Koichi Sugimoto, Ueda, JP;
Shunichi Hashimoto, Minato, JP;
Kenji Saito, Kobe, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
A high-strength cold rolled steel sheet contains: 0.10 to 0.28% of C, 1.0 to 2.0% of Si, 1.0 to 3.0% of Mn, and 0.03 to 0.10% of Nb in terms of % by mass, Al is controlled to 0.5 or less, P is controlled to 0.15% or less, and S is controlled to 0.02% or less, and residual austenite accounts for 5 to 20%, bainitic ferrite accounts for 50% or more, and polygonal ferrite accounts for 30% or less (containing 0%), of the entire structure, and a mean number of residual austenite blocks is 20 or more as determined when the random area (15 μm×15 μm) is observed by EBSP (electron back scatter diffraction pattern).