Importance

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Abstract

Provided is a Ni-plated steel sheet being excellent in press formability and suppression of wear of a mold and capable of maintaining alkali battery characteristic even after a lapse of time. In a Ni-plated steel sheet for a battery can having excellent press formability, an Fe—Ni diffusion layer and a Ni layer formed on the Fe—Ni diffusion layer are formed on a surface of a steel sheet corresponding to an outer surface of the battery can, a semi-bright Ni plating layer is formed on the Ni layer, a Ni coating weight of the Fe—Ni diffusion layer and the Ni layer formed on the Fe—Ni diffusion layer is set equal to or smaller than a Ni coating weight of the semi-bright Ni plating layer, the Ni coating weight of the semi-bright Ni plating layer is 2.25 g/m² or more, surface roughness Ra1 of a surface of the semi-bright Ni plating layer in an area of 2.5 μm×2.5 μm which is measured by an atomic force microscope falls within a range from 3 to 11 nm, and surface roughness Ra2 measured by a traceable roughness gauge is 0.3 μm or more and 2.0 μm or less with respect to the surface roughness Ra of the semi-bright Ni plating layer.

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First Claim