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:
Mar. 18, 2014
Filed:
Dec. 10, 2007
Muneaki Ikeda, Kakogawa, JP;
Kouji Kasuya, Kakogawa, JP;
Yoichi Mukai, Kakogawa, JP;
Fumio Yuse, Kobe, JP;
Junichiro Kinugasa, Kobe, JP;
Muneaki Ikeda, Kakogawa, JP;
Kouji Kasuya, Kakogawa, JP;
Yoichi Mukai, Kakogawa, JP;
Fumio Yuse, Kobe, JP;
Junichiro Kinugasa, Kobe, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
The present invention is the thin steel sheet containing C, Si, Mn, P, S, Al, Mo, Ti, B, and N wherein a value Z calculated by the equation described below is 2.0-6.0, an area ratio against all the structure is 1% or above for retained austenite and 80% or above for total of bainitic ferrite and martensite, a mean axis ratio of the retained austenite crystal grain is 5 or above, and tensile strength is 980 MPa or above whereValue Z=9×[C]+[Mn]+3×[Mo]+490×[B]+7×[Mo]/{100×([B]+0.001),andthe thin steel sheet has 980 MPa or above tensile strength and enhanced hydrogen embrittlement resistance properties.