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. 10, 2004
Filed:
Apr. 15, 2002
Takeshi Fujita, Fukuyama, JP;
Fusato Kitano, Fukuyama, JP;
Yoshihiro Hosoya, Fukuyama, JP;
Toru Inazumi, Fukuyama, JP;
Yuji Yamasaki, Fukuyama, JP;
Masaya Morita, Fukuyama, JP;
Yasunobu Nagataki, Fukuyama, JP;
Kohei Hasegawa, Fukuyama, JP;
Hiroshi Matsuda, Fukuyama, JP;
Moriaki Ono, Fukuyama, JP;
NKK Corporation, Tokyo, JP;
Abstract
A high strength cold rolled steel sheet consists essentially of 0.0040 to 0.01% C, not more than 0.05% Si, 0.1 to 1.0% Mn, 0.01 to 0.05% P, not more than 0.02% S, 0.01 to 0.1% sol.Al, not more than 0.004% N, 0.01 to 0.14% Nb, by weight, and a balance of substantially Fe and inevitable impurities, and having an n value of not less than 0.21 calculated from two points (1% and 10%) of nominal strain determined by the uniaxial tensile test, and a method for manufacturing the cold rolled steel sheet. The high strength cold rolled steel sheet has excellent combined formability, resistance to embrittlement during secondary operation, formability at welded portions, and anti-burring performance, and has a desirable surface appearance and uniformity of material in a coil, and thus can be desirably used for automobile exterior panels.