Nippon Steel Chemical & Material Co., Ltd.

Nippon Steel Corporation

Nippon Steel & Sumikin Materials Co., Ltd.

Nippon Steel Sumitomo Metal Corporation

Krosakiharima Corporation

Hiroto Unno

Naoki Fujimoto

Masahiro Fukuda

Yutaka Sato

Koichi Nose

Toru Inaguma

Naoya Sawaki

Tomohiro Uno

Yasuto Goto

Masaharu Ibaragi

Shuji Nagasaki

Kiyokazu Ishizuka

Tatsuo Nagata

Shinichi Terashima

Nobuo Kadowaki

Keita Kimura

A high-strength steel foil for the positive and negative electrode current collectors of nickel-hydrogen secondary batteries which uses a light weight and economical steel foil and which is thin and strong and has excellent rust resistance and resistance to metal ion leaching. Also, a high-strength steel foil for the positive and negative electrode current collectors of nickel-hydrogen secondary batteries which has excellent elongation. The Ni-plated steel foil for hydrogen secondary battery current collectors comprises, by mass %, C: 0.0001 to 0.0200%, Si: 0.0001 to 0.0200%, Mn: 0.005 to 0.300%, P: 0.001 to 0.020%, S: 0.0001 to 0.0100%, Al: 0.0005 to 0.1000%, N: 0.0001 to 0.0040%, one or both of Ti and Nb: 0.800% or less respectively, and a balance of Fe and impurities. The Ni-plated steel foil has an Ni plating layer on both surfaces. The thickness of the Ni plating layer on both surfaces of the Ni-plated steel foil is greater than or equal to 0.15 μm, the thickness of the Ni-plated steel foil is 5 to 50 μm, the tensile strength is over 400 MPa but no greater than 1200 MPa, and the surface defect area percentage is less than or equal to 5.00% for both surfaces of the Ni-plated steel foil.

Ni-plated steel foil for nickel-hydrogen secondary battery current collector, nickel-hydrogen secondary battery current collector, and nickel-hydrogen secondary battery

The present invention has as its technical issue to secure not only mechanical strength but also conductivity by increasing the contact area with the positive electrode active substance or positive electrode mixture while also securing corrosion resistance to alkali or an electrolytic solution when applying stainless steel foil to a current collector for a positive electrode of a secondary battery so as to deal with the increasingly higher capacities and smaller sizes and lighter weights of lithium ion secondary batteries and has as its object the provision of a current collector for a positive electrode of a secondary battery using such stainless steel foil. The invention is a current collector comprised of stainless steel foil made to decrease in surface hardness while obtaining corrosion resistance by giving it a chemical composition decreased in Cr and containing a trace amount of Sn or a chemical composition containing Ti, a thickness of 1 μm or more and 20 μm or less, and a surface hardness of a Vickers hardness of Hv300 or less applied to a secondary battery positive electrode. When measuring an electrical contact resistance between the positive electrode active substance and the current collector after pressing, when the filling ratio of the positive electrode mixture is 74%, the electrical contact resistance is 100Ω or less. In particular, that effect is exhibited when the density of the positive electrode mixture is 3.0 g/cmor more (filling ratio: 50% or more).

Stainless foil current collector for secondary battery positive electrodes

A metal mask material for OLED use reduced in amount warpage due to etching, a method for manufacturing the same, and a metal mask are provided. The metal mask material and metal mask of the present invention contain, by mass %, Ni: 35.0 to 37.0% and Co: 0.00 to 0.50%, have a balance of Fe and impurities, have thicknesses of 5.00 μm or more and 50.00 μm or less, and have amounts of warpage defined as maximum values in amounts of rise of four corners of a square shaped sample of the metal mask material of 100 mm sides when etching the sample from one surface until the thickness of the sample becomes ⅖ and placing the etched sample on a surface plate of 5.0 mm or less.

Metal mask material, method for manufacturing same, and metal mask

The present invention has as its object to provide thickness 60 &#x3bc;m or less ultra-thin stainless steel foil which secures high thickness precision and simultaneously secures plastic deformability and good elongation at break, that is, secures good press-formability (deep drawability). The present invention solves this problem by ultra-thin stainless steel foil which has three or more crystal grains in a thickness direction, has a recrystallization rate of 90% to 100%, and has a nitrogen concentration of a surface layer of 1.0 mass % or less. For this reason, there is provided a method of production of stainless steel foil comprising rolling stainless steel sheet, then performing final annealing and making a thickness 5 &#x3bc;m to 60 &#x3bc;m, wherein a rolling reduction ratio at rolling right before final annealing is 30% or more, a temperature of final annealing after rolling is 950&#xb0; C. to 1050&#xb0; C. in the case of austenitic stainless steel and 850&#xb0; C. to 950&#xb0; C. in the case of ferritic stainless steel, and a nitrogen content in atmospheric gas in final annealing is 0.1 vol % or less, whereby ultra-thin stainless steel foil can be produced.

Stainless steel foil and method of production of same

The present invention provides a ferritic stainless steel foil high in stretch-expand formability and further small in anisotropy of deformation with respect to stretch-expand forming even with ultrathin steel foil with a thickness of 60 &#x3bc;m or less. The ferritic stainless steel foil has a thickness of 5 &#x3bc;m to 60 &#x3bc;m, wherein a recrystallization rate of the stainless steel foil is 90% to 100%, and in an orientation distribution function obtained by analysis of a crystalline texture of the stainless steel foil, when a Euler angle &#x3c6;2 is 45&#xb0;&#xb1;10&#xb0;, at a plane expressed by a Euler angle &#x3a6; of 53.4&#xb0;&#xb1;10&#xb0;, a maximum peak strength ratio in peak strength ratios shown by orientations corresponding to a Euler angle &#x3c6;1 is 25 or less, where the Euler angle &#x3c6;1 is 0 to 90&#xb0;. The ferritic stainless steel foil may be laminated with a resin film and is useful for producing a battery case.

Ferritic stainless steel foil

The present invention provide a ferritic stainless steel foil having a high thickness precision even with a thickness 60 &#x3bc;m or less ultrathin stainless steel foil and simultaneously having a plastic deformation ability and good elongation at break, that is, having a good press-formability (deep drawing ability). The present invention is a stainless steel foil having a thickness of 5 &#x3bc;m to 60 &#x3bc;m, wherein a recrystallization ratio of said stainless steel foil is 90% to 100%, a surface layer of said stainless steel foil has a nitrogen concentration of 1.0 mass % or less, three or more crystal grains are contained in the thickness direction of said stainless steel foil, an average crystal grain diameter 'd' of said crystal grains is 1 &#x3bc;m to 10 &#x3bc;m, and, when said thickness is 't' (&#x3bc;m), an area ratio of crystal grains having a crystal grain diameter of t/3 (&#x3bc;m) or more is 20% or less.

Stainless steel foil

A steel foil for an electrical storage device container, including a steel foil, a metal chromium layer layered on the steel foil, and a hydrated chromium oxide layer layered on the metal chromium layer, in which the concentration of Fe from a surface of the hydrated chromium oxide layer to a depth of 10 nm is less than 10% by mass, the area ratio of a site having an arithmetic mean roughness Ra of 10 nm or more in a visual field of 1 &#x3bc;m at the surface of the hydrated chromium oxide layer is less than 20%, and a site having an arithmetic mean roughness Ra of less than 10 nm in a visual field of 1 &#x3bc;m has an arithmetic mean roughness Ra of 3 nm or less in a visual field of 1 &#x3bc;m at the surface of the hydrated chromium oxide layer, is adopted.

Steel foil for electrical storage device container, container for electrical storage device, and electrical storage device

A steel foil for a power storage device container includes a rolled steel foil which has a thickness of 200 &#x3bc;m or less, a diffusion alloy layer which is formed on a surface layer of the rolled steel foil and contains Ni and Fe, and a chromium-based surface treatment layer which is formed on the diffusion alloy layer. The &#x3c;111&#x3e; polar density in a reverse pole figure of the diffusion alloy layer in a rolling direction is 2.0 to 6.0, and the aspect ratio of crystal in a surface of the diffusion alloy layer is 1.0 to 5.0.

Steel foil for power storage device container, power storage device container, power storage device, and manufacturing method of steel foil for power storage device container

Provided is an austenitic stainless steel foil that demonstrates a high degree of stretch formability and little deformation anisotropy with respect to stretch forming despite having a sheet thickness of 60 &#x3bc;m or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 &#x3bc;m to 60 &#x3bc;m, a recrystallization rate of 90% to 100%, and a texture in which the total of the area ratio of a crystal orientation in which the difference in orientation from the {112}&#x3c;111&#x3e; orientation is within 10&#xb0;, the area ratio of a crystal orientation in which the difference in orientation from the {110}&#x3c;112&#x3e; orientation is within 10&#xb0;, and the area ratio of a crystal orientation in which the difference in orientation from the {110}&#x3c;001&#x3e; orientation is within 10&#xb0;, in a measuring field thereof, is 20% or less.

Austenitic stainless steel foil

A steel foil for a power storage device container includes a rolled steel foil, a nickel layer formed on a surface of the rolled steel foil, and a chromium-based surface treatment layer formed on a surface of the nickel layer. The nickel layer includes an upper layer portion which is in contact with the chromium-based surface treatment layer and contains Ni of 90 mass % or more among metal elements, and a lower layer portion which is in contact with the rolled steel foil and contains Ni of less than 90 mass % among the metal elements and Fe. &#x3c;111&#x3e; polar density in a reverse pole figure of the nickel layer in a rolling direction is 3.0 to 6.0. The nickel layer has a sub-boundary which is a boundary between two crystals having a relative orientation difference of 2&#xb0; to 5&#xb0;, and a large angle boundary which is a boundary between two crystals having the relative orientation difference of equal to or more than 15&#xb0;. The average value of a ratio L/Lbetween a boundary length Lwhich is the length of the sub-boundary, and a boundary length Lwhich is the length of the large angle boundary, is equal to or more than 1.0.

Disclosed is a boron carbide-based ceramics material which has a high density and a high specific rigidity, but additionally with excellent processability, and a production method for the boron carbide-based ceramics material. Specifically, the high-rigidity ceramics material contains boron carbide in an amount of 90 to 99.5 mass %, wherein at least silicon, aluminum, oxygen and nitrogen coexist in a grain boundary phase between crystal grains of the boron carbide. This high-rigidity ceramics material can be produced by a method comprising: preparing a boron carbide powder, and, as a sintering aid, one or more selected from the group consisting of an oxide, a nitride and an oxynitride of silicon, an oxide, a nitride and an oxynitride of aluminum, and a composite oxide, a composite nitride and a composite oxynitride of aluminum and silicon, in such a manner as to contain all of Si, Al, O and N; and subjecting the boron carbide powder and the sintering aid to mixing, forming and sintering.

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Tokyo, Japan

Hiroto Unno