A metal magnetic powder is constituted by metal magnetic grains that each include: a metal phase where the mass percentage of Fe at its center part is lower than that at its contour part; and an oxide film covering the metal phase so as to allow the magnetic body resistant to magnetic saturation and low in iron loss.

A system and method for treating a cavity comprises arranging a niobium structure in a coating chamber, the coating chamber being arranged inside a furnace, coating the niobium structure with tin thereby forming an Nb.sub.3Sn layer on the niobium structure, and doping the Nb.sub.3Sn layer with nitrogen, thereby forming a nitrogen doped Nb.sub.3Sn layer on the niobium structure.

A method for producing a steel strip with an aluminium alloy coating layer in a continuous coating process. Also, a steel strip coated with an aluminium alloy coating layer that can be produced in accordance with the method, the use of such a coated steel strip and the product made by using the coated steel strip.

A method for producing a steel strip with an aluminium alloy coating layer in a continuous coating process. Also, a steel strip coated with an aluminium alloy coating layer that can be produced in accordance with the method, the use of such a coated steel strip and the product made by using the coated steel strip.

A method for producing a porous member, whereby a member having smaller microgaps can be produced, and additionally, the outermost surface alone can be made porous and a porous layer can be formed on the surface while maintaining the characteristics of portions in which no porous layer is formed, is provided.

A method for producing a porous member, whereby a member having smaller microgaps can be produced, and additionally, the outermost surface alone can be made porous and a porous layer can be formed on the surface while maintaining the characteristics of portions in which no porous layer is formed, is provided.

A Ni-coated steel sheet according to an aspect of the present invention includes: a base steel sheet; a diffusion alloy layer disposed on the base steel sheet; and a Ni-coated layer disposed on the diffusion alloy layer, in which a depth-hardness curve obtained by continuously performing Vickers hardness measurement on a cross section perpendicular to a rolled surface of the base steel sheet from a surface layer of the Ni-coated layer to the base steel sheet using a nanoindenter includes, in the diffusion alloy layer, a peak indicating a Vickers hardness of 1.50 times or more a Vickers hardness of the surface layer of the Ni-coated layer.

The invention relates to a method for producing a steel composite in which at least two steel sheets that consist of different steel grades are placed against each other, hot rolled together, and then possibly cold rolled and in which after the rolling, the composite material, which is thus produced from at least two layers with different steel compositions, is diffusion annealed, wherein the annealing temperature is set so as to select the chemical potential of the steel materials to correspond to the following equation:
μ.sub.C,material 1>μ.sub.C,material 2,
where material 1 has a lower carbon content than material 2 so that an uphill diffusion of carbon takes place between material 1 and material 2.

The invention relates to a method for producing a steel composite in which at least two steel sheets that consist of different steel grades are placed against each other, hot rolled together, and then possibly cold rolled and in which after the rolling, the composite material, which is thus produced from at least two layers with different steel compositions, is diffusion annealed, wherein the annealing temperature is set so as to select the chemical potential of the steel materials to correspond to the following equation:
μ.sub.C,material 1>μ.sub.C,material 2,
where material 1 has a lower carbon content than material 2 so that an uphill diffusion of carbon takes place between material 1 and material 2.

Provided is a non-oriented electrical steel sheet having excellent adhesion with an insulating coating even if the thickness of the insulating coating is reduced. The non-oriented electrical steel sheet of the present disclosure has an insulating coating on at least one surface of the steel sheet, where the insulating coating has a P-concentrated layer on both a surface side and an interface side with a steel substrate, and a P concentration of the P-concentrated layer is higher than a P concentration in the steel substrate.