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. 27, 2014
Filed:
May. 31, 2010
Shinichi Takematsu, Yamaguchi, JP;
Eiji Okamatsu, Yamaguchi, JP;
Hideyuki Minagi, Yamaguchi, JP;
Toyo Kohan Co., Ltd., Tokyo, JP;
Abstract
A Ni-plated steel sheet is provided in which the occurrence of scratches at the time of forming a battery can is suppressed. Also provided is a method which includes a step where a surface of a steel sheet is plated with Ni in a Ni adhesion amount of 0.3-2 μm, a step where the Ni-plated steel sheet is heated to 600-800° C. to form an Fe−Ni diffusion layer as an outermost surface layer, and a step where the steel sheet is rolled by temper rolling so as to adjust the Fe−Ni diffusion layer so that the steel sheet has the surface roughness Ra of 0.9-2.0 μm and the surface roughness Ry of 4.0-15 μm. A Ni-plated steel sheet which includes an Fe−Ni diffusion layer as an outermost surface layer and in which the diffusion layer has the surface roughness Ra of 0.9-2.0 μm and the surface roughness Ry of 4.0-15 μm and the diffusion layer has such an Fe/Ni ratio that the Fe accounts for 20-50% in Auger analysis is subjected to drawing using a water-soluble liquid which contains water-soluble emersion as a press lubricant.