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:
Feb. 15, 2011
Filed:
Dec. 28, 2006
Junichiro Kinugasa, Hyogo, JP;
Fumio Yuse, Hyogo, JP;
Yoichi Mukai, Hyogo, JP;
Shinji Kozuma, Hyogo, JP;
Hiroshi Akamizu, Hyogo, JP;
Kouji Kasuya, Hyogo, JP;
Muneaki Ikeda, Hyogo, JP;
Koichi Sugimoto, Nagano, JP;
Junichiro Kinugasa, Hyogo, JP;
Fumio Yuse, Hyogo, JP;
Yoichi Mukai, Hyogo, JP;
Shinji Kozuma, Hyogo, JP;
Hiroshi Akamizu, Hyogo, JP;
Kouji Kasuya, Hyogo, JP;
Muneaki Ikeda, Hyogo, JP;
Koichi Sugimoto, Nagano, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
The invention relates to an ultrahigh-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, 0.15% or less of P, 0.02% or less of S, 1.5% or less of Al, 0.003 to 2.0% of Cr, and a balance including iron and inevitable impurities; in which grains of residual austenite have an average axis ratio (major axis/minor axis) of 5 or more, the grains of the residual austenite have an average minor axis length of 1 μm or less, and the grains of the residual austenite have a nearest-neighbor distance between the grains of 1 μm or less.