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:
Aug. 15, 2006
Filed:
Jan. 31, 2002
Takahiro Kashima, Hyogo, JP;
Shunichi Hashimoto, Hyogo, JP;
Shushi Ikeda, Hyogo, JP;
Hiroshi Akamizu, Hyogo, JP;
Koh-ichi Sugimoto, Nagano, JP;
Akihiko Nagasaka, Nagano, JP;
Akinobu Kanda, Nagano, JP;
Ryo Kikuchi, Nagano, JP;
Takahiro Kashima, Hyogo, JP;
Shunichi Hashimoto, Hyogo, JP;
Shushi Ikeda, Hyogo, JP;
Hiroshi Akamizu, Hyogo, JP;
Koh-ichi Sugimoto, Nagano, JP;
Akihiko Nagasaka, Nagano, JP;
Akinobu Kanda, Nagano, JP;
Ryo Kikuchi, Nagano, JP;
Abstract
A high strength steel sheet having (2-1) a base phase structure, the base phase structure being tempered martensite or tempered bainite and accounting for 50% or more in terms of a space factor relative to the whole structure, or the base phase structure comprising tempered martensite or tempered bainite which accounts for 15% or more in terms of a space factor relative to the whole structure and further comprising ferrite, the tempered martensite or the tempered bainite having a hardness which satisfies the relation of Vickers hardness (Hv)≧500[C]+30[Si]+3[Mn]+50 where [ ] represents the content (mass %) of each element, and (2-2) a second phase structure comprising retained austenite which accounts for 3 to 30% in terms of a space factor relative to the whole structure and optionally further comprising bainite and/or martensite, the retained austenite having a C concentration (CγR) of 0.8% or more.