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. 27, 2011
Filed:
Sep. 30, 2004
Naoki Yoshinaga, Kimitsu, JP;
Shunji Hiwatashi, Kimitsu, JP;
Yasuharu Sakuma, Kimitsu, JP;
Atsushi Itami, Tokyo, JP;
Naoki Yoshinaga, Kimitsu, JP;
Shunji Hiwatashi, Kimitsu, JP;
Yasuharu Sakuma, Kimitsu, JP;
Atsushi Itami, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
High yield ratio high-strength thin steel sheet superior in weldability and ductility characterized by: being comprised of steel containing, by mass %, C: over 0.030 to less than 0.10%, Si: 0.30 to 0.80%, Mn: 1.7 to 3.2%, P: 0.001 to 0.02%, S: 0.0001 to 0.006%, Al: 0.060% or less, N: 0.0001 to 0.0070%, containing further Ti: 0.01 to 0.055%, Nb: 0.012 to 0.055%, Mo: 0.07 to 0.55%, B: 0.0005 to 0.0040%, and simultaneously satisfying 1.1 ≦14×Ti(%)+20×Nb(%)+3×Mo(%)+300×B(%)≦3.7, the balance comprised or iron and unavoidable impurities, and having a yield ratio of 0.64 to less than 0.92, a TS×E1of 3320 or more, an YR×TS×ELof 2320 or more, and a maximum tensile strength (TS) of 780 MPa or more.