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:
May. 24, 2016
Filed:
Apr. 12, 2012
Manufacturing method of a high-strength cold-rolled steel sheet having excellent local deformability
Yoshihiro Suwa, Tokyo, JP;
Kazuaki Nakano, Tokyo, JP;
Kunio Hayashi, Tokyo, JP;
Riki Okamoto, Tokyo, JP;
Nobuhiro Fujita, Tokyo, JP;
Kohichi Sano, Tokyo, JP;
Yoshihiro Suwa, Tokyo, JP;
Kazuaki Nakano, Tokyo, JP;
Kunio Hayashi, Tokyo, JP;
Riki Okamoto, Tokyo, JP;
Nobuhiro Fujita, Tokyo, JP;
Kohichi Sano, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
This high-strength cold-rolled steel sheet contains, in mass %, C: 0.02% to 0.20%; Si: 0.001% to 2.5%; Mn: 0.01% to 4.0%; P: 0.001% to 0.15%; S: 0.0005% to 0.03%; Al: 0.001% to 2.0%; N: 0.0005% to 0.01%; and O: 0.0005% to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100}<011> to {223}<110> orientation group is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 7 μm or less.