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:
Sep. 11, 2012
Filed:
Apr. 08, 2011
Toshiki Nonaka, Tokai, JP;
Hirokazu Taniguchi, Tokai, JP;
Masaaki Mizutani, Tokai, JP;
Nobuhiro Fujita, Futtsu, JP;
Toshiki Nonaka, Tokai, JP;
Hirokazu Taniguchi, Tokai, JP;
Masaaki Mizutani, Tokai, JP;
Nobuhiro Fujita, Futtsu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A high strength steel sheet excellent in formability which has a chemical composition in mass %: C: 0.03 to 0.20%, Si: 0.005 to 0.3%, Mn: 1.0 to 3.1%, P: 0.001 to 0.06%, S: 0.001 to 0.01%, N: 0.0005 to 0.01%, Al: 0.2 to 1.2%, Mo≦0.5%, and the balance: Fe and inevitable impurities, with the proviso that the values of mass % for Si and Al satisfy the following formula (1):(0.0012×[objective value of TS]−0.29−[Si])/2.45<Al<1.5−3×[Si]  (1)wherein [objective value of TS] represents a design strength value for the steel sheet in an Mpa unit, and has a metal structure containing ferrite and martensite. The above high strength steel sheet is also excellent in formability and the capability of being chemically treated and that of being hot-dip zinc sheeted.