Abstract: The present invention addresses the problem of reducing the cause of etching failure or pinholes as much as possible in an extremely thin ferrous alloy foil that has a thickness of 10-30 ?m and that is applied to a metal mask used for increasing the precision of an electronic component. In order to solve the abovementioned problem, the present invention provides a ferrous alloy foil that has a composition containing at most 0.150% of C, at most 2.00% of Si, at most 10.00% of Mn 2.00-50.00% of Ni, at most 19.00% of Cr, at most 0.20% of N, at most 0.030% of Al, at most 5.00% of Co, at most 0.0005% of Mg, at most 0.0005% of Ca, at most 0.01% of Ti, at most 0.035% of P, and at most 0.0300% of S, with the balance consisting of Fe and impurities. The amount of Al2O3 is at most 30 mass % and the amount of MgO is at most 15 mass % with respect to the total mass of inclusions having a particle diameter of 2.00 ?m or larger, and among the inclusions having a particle diameter of 2.

Abstract: The present invention has as its object to provide thickness 60 ?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 ?m to 60 ?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° C. to 1050° C. in the case of austenitic stainless steel and 850° C. to 950° C.

Abstract: 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 ?m or less. The ferritic stainless steel foil has a thickness of 5 ?m to 60 ?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 ?2 is 45°±10°, at a plane expressed by a Euler angle ? of 53.4°±10°, a maximum peak strength ratio in peak strength ratios shown by orientations corresponding to a Euler angle ?1 is 25 or less, where the Euler angle ?1 is 0 to 90°. The ferritic stainless steel foil may be laminated with a resin film and is useful for producing a battery case.

Abstract: The present invention provide a ferritic stainless steel foil having a high thickness precision even with a thickness 60 ?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 ?m to 60 ?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 ?m to 10 ?m, and, when said thickness is “t” (?m), an area ratio of crystal grains having a crystal grain diameter of t/3 (?m) or more is 20% or less.

Abstract: 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 ?m or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 ?m to 60 ?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}<111> orientation is within 10°, the area ratio of a crystal orientation in which the difference in orientation from the {110}<112> orientation is within 10°, and the area ratio of a crystal orientation in which the difference in orientation from the {110}<001> orientation is within 10°, in a measuring field thereof, is 20% or less.

Abstract: The present invention provide 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 ?m or less. The present invention is a ferritic stainless steel foil having a thickness of 5 ?m to 60 ?m, wherein a recrystallization rate of said stainless steel foil is 90% to 100%, and in an orientation distribution function obtained by analysis of a crystalline texture of said stainless steel foil, when a Euler angle ?2 is 45°±10°, at the plane expressed by a Euler angle ? of 53.4°±10°, the maximum peak strength ratio in the peak strength ratios shown by orientations corresponding to the Euler angle ?1 is 25 or less, where the Euler angle ?1 is 0 to 90°.

Abstract: 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 ?m or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 ?m to 60 ?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}<111> orientation is within 10°, the area ratio of a crystal orientation in which the difference in orientation from the {110}<112> orientation is within 10°, and the area ratio of a crystal orientation in which the difference in orientation from the {110}<001> orientation is within 10°, in a measuring field thereof, is 20% or less.

Abstract: The present invention provide a ferritic stainless steel foil having a high thickness precision even with a thickness 60 ?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 ?m to 60 ?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 ?m to 10 ?m, and, when said thickness is “t” (?m), an area ratio of crystal grains having a crystal grain diameter of t/3 (?m) or more is 20% or less.

Abstract: Provided are a solder ball having extremely excellent drop impact resistance and an electronic member comprising the solder ball. The solder ball of the present invention contains Ni in an amount of from 0.04 to 0.2% by mass and the balance is Sn and incidental impurities, and Cu is not more than a detection limit of the ICP analysis. Hence, it is possible to provide the solder ball having extremely excellent drop impact resistance and an electronic member comprising the solder ball.

Abstract: The present invention has as its object to provide thickness 60 ?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 ?m to 60 ?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° C. to 1050° C. in the case of austenitic stainless steel and 850° C. to 950° C.