Toyo Kohan Co., Ltd.

Shinichi Takematsu

Hideyuki Minagi

Eiji Okamatsu

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 &#x3bc;m, a step where the Ni-plated steel sheet is heated to 600-800&#xb0; C. to form an Fe&#x2212;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&#x2212;Ni diffusion layer so that the steel sheet has the surface roughness Ra of 0.9-2.0 &#x3bc;m and the surface roughness Ry of 4.0-15 &#x3bc;m. A Ni-plated steel sheet which includes an Fe&#x2212;Ni diffusion layer as an outermost surface layer and in which the diffusion layer has the surface roughness Ra of 0.9-2.0 &#x3bc;m and the surface roughness Ry of 4.0-15 &#x3bc;m 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.

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Yamaguchi, Japan

Shinichi Takematsu