Nippon Steel Sumitomo Metal Corporation

Nippon Steel & Sumikin Materials Co., Ltd.

Nippon Stell & Sumikin Materials Co., Ltd.

Hideaki Suda

Takayuki Kobayashi

Jun Maki

Masao Kurosaki

Shinichi Terashima

Masamoto Tanaka

Shuji Nagasaki

Masami Fujishima

A metal foil including: a steel layer whose thickness is 10 to 200 &#x3bc;m; an Al-containing metal layer arranged on the steel layer; and plural granular alloys which exist in an interface between the steel layer and the Al-containing metal layer, wherein, when a cutting-plane line of a surface of the Al-containing metal layer is defined as a contour curve and an approximation straight line of the contour curve is defined as a contour average straight line, a maximum point, whose distance from the contour average straight line is more than 10 &#x3bc;m, is absent on the contour curve, and wherein, when an equivalent sphere diameter of the granular alloys is x in units of &#x3bc;m and a thickness of the Al-containing metal layer is T in units of &#x3bc;m, the granular alloys satisfy x&#x2266;0.5T.

Metal foil for base material and producing method thereof

A metal foil including: a steel layer whose thickness is 10 to 200 &#x3bc;m; an alloy layer which contains Fe and Al and which is formed on the steel layer; and an Al-containing metal layer arranged on the alloy layer, wherein, when a cutting-plane line of a surface of the Al-containing metal layer is defined as a contour curve and an approximation straight line of the contour curve is defined as a contour average straight line, a maximum point, whose distance from the contour average straight line is more than 10 &#x3bc;m, is absent on the contour curve, and a thickness of the alloy layer is 0.1 to 8 &#x3bc;m and the alloy layer contains an AlCuFe intermetallic compound or FeAlbased intermetallic compounds.

Metal foil for base material

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Tokyo, Japan

Hideaki Suda