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:
Jul. 06, 2010
Filed:
Nov. 28, 2003
Tatsuo Yokoi, Oita, JP;
Teruki Hayashida, Oita, JP;
Masahiro Ohara, Oita, JP;
Kouichi Tsuchihashi, Oita, JP;
Tatsuo Yokoi, Oita, JP;
Teruki Hayashida, Oita, JP;
Masahiro Ohara, Oita, JP;
Kouichi Tsuchihashi, Oita, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention provides high burring, high strength steel sheet excellent in softening resistance of the weld heat affected zone and a method of production of the same, that is, high burring, high strength steel sheet excellent in softening resistance of the weld heat affected zone containing, by wt %, C: 0.01 to 0.1%, Si: 0.01 to 2%, Mn: 0.05 to 3%, P≦0.1%, S≦0.03%, Al: 0.005 to 1%, N: 0.0005 to 0.005%, and Ti: 0.05 to 0.5% and further containing C, S, N, Ti, Cr, and Mo in ranges satisfying 0%<C−(12/48Ti−12/14N−12/32S)≦0.05%, Mo+Cr≧0.2%, Cr≦0.5%, and Mo≦0.5%, the balance being Fe and unavoidable impurities, wherein the microstructure comprises ferrite or ferrite and bainite.