Abstract: A manufacturing method of a non-oriented electrical steel sheet includes: performing finish annealing of a cold-rolled steel strip; and forming a tension-applying type insulating film of not less than 1 g/m2 and not more than 6 g/m2 on a surface of the cold-rolled steel strip. The performing the finish annealing includes forming an oxide layer containing Al2O3 or (Al, Cr)2O3 and having a thickness of not less than 0.01 ?m and not more than 0.5 ?m on the surface of the cold-rolled steel strip with setting a temperature of the cold-rolled steel strip to not lower than 800° C. and not higher than 1100° C. in an atmosphere where when the total content of Si and Al of the cold-rolled steel strip is represented as X (mass %), a partial pressure ratio of water vapor to hydrogen is equal to or less than 0.005×X2.

Abstract: An electrical steel sheet has an insulation coating on a steel sheet surface. The insulation coating includes: a binder consisting of 100 parts by mass of a metal phosphate and 1 to 50 parts by mass of an organic resin having an average particle size of 0.05 to 0.50 ?m; and a carboxylic acid-containing compound with a carbon number of 2 to 50 in an amount of 0.1 to 10.0 parts by mass based on 100 parts by mass of solids content of the binder. The organic resin is at least one selected from the group consisting of acrylic resins, epoxy resins, and polyester resins. The insulation coating of this electrical steel sheet shows good edge corrosion resistance after blanking.

Abstract: An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2). Three conditions (1.8?3[Fe]/[P]+?nM[M]/[P]?3.6, 0.6??nM[M]/[P]?2.4, and 0.6?3[Fe]/[P]?2.4) are satisfied in a region of 50 area % or more of a cross section parallel to a thickness direction of the insulating film. [Fe] denotes a proportion (atom %) of Fe, [P] denotes a proportion (atom %) of P, [M] denotes a proportion (atom %) of each of Al, Zn, Mg and Ca, and nM denotes a valence of each of Al, Zn, Mg and Ca.

Abstract: An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2), the insulating film (3) containing a polyvalent metal phosphate and Fe. A maximum value of a parameter Q expressed by “Q=CFe—O/CP” is equal to or less than 1.3 times an average value of the parameter Q in a region from a first depth from a surface of the insulating film to a second depth, CFe—O denoting a proportion (atom %) of Fe bonded to O relative to all elements, and CP denoting a proportion (atom %) of P relative to all elements. The first depth is 20 nm from the surface, and the second depth is a depth where the proportion of P is equal to a proportion of metal Fe.

Abstract: An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2). The insulating film (3) contains a phosphate of one or more selected from the group consisting of Al, Zn, Mg and Ca. A proportion of an amount by mole (mol) of Fe atoms relative to an amount by mole (mol) of P atoms in the insulating film (3) is more than 0.1 nor more than 0.65.

Abstract: An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2). The insulating film (3) contains a phosphates of one or more selected from the group consisting of Al, Zn, Mg and Ca. The phosphate exhibits a specific peak having a top within a range of ?26 ppm to ?16 ppm in a solid 31P-NMR spectrum, and a proportion of an integrated intensity of the specific peak relative to an integrated intensity of all peaks in the solid 31P-NMR spectrum is 30% or more.

Abstract: A manufacturing method of a non-oriented electrical steel sheet includes: performing finish annealing of a cold-rolled steel strip; and forming a tension-applying type insulating film of not less than 1 g/m2 and not more than 6 g/m2 on a surface of the cold-rolled steel strip. The performing the finish annealing includes forming an oxide layer containing Al2O3 or (Al, Cr)2O3 and having a thickness of not less than 0.01 ?m and not more than 0.5 ?m on the surface of the cold-rolled steel strip with setting a temperature of the cold-rolled steel strip to not lower than 800° C. and not higher than 1100° C. in an atmosphere where when the total content of Si and Al of the cold-rolled steel strip is represented as X (mass %), a partial pressure ratio of water vapor to hydrogen is equal to or less than 0.005×X2.

Abstract: A solution for forming an insulation coating of grain-oriented electrical steel sheet includes an aqueous solution prepared by mixing a phosphate solution and colloidal silica. Chromium is not added to the aqueous solution. The colloidal silica includes silica particles surface-modified by an aluminate or is prepared by adding an aluminate to colloidal silica such as conventional colloidal silica.

Abstract: A non-oriented electrical steel sheet includes: a base iron (1); and a tension applying type insulating film (2) of not less than 1 g/m2 nor more than 6 g/m2 on a surface of the base iron (1). An oxide layer (3) containing at least one type of oxide selected from the group consisting of Si, Al, and Cr and having a thickness of not less than 0.01 ?m nor more than 0.5 ?m is formed on the surface of the base iron (1).

Abstract: Nitriding process of a steel strip is performed. Next, annealing is performed to form a forsterite based glass coating film at a surface of the steel strip. Heating is performed up to 1000° C. or more in a mixed gas atmosphere containing H2 gas and N2 gas, and a rate of N2 gas is 20 volume % or more, next, the atmosphere is switched into H2 gas atmosphere at the temperature of 1000° C. or more and 1100° C. or less, when the annealing is performed. An oxygen potential P (H2O)/P (H2) is set to be 0.05 to 0.3 when the temperature is 850° C. or less during the heating in the mixed gas atmosphere.

Abstract: To provide a grain oriented electrical steel sheet that can securely suppress propagation of lateral strain, and can make a product even from a portion where the lateral strain occurs. A grain oriented electrical steel sheet of the present invention has a linearly altered portion 14 generated in a glass coating film 12 at one of side edges of a steel sheet 11, in a continuous line or in a discontinuous broken line in a direction parallel with a rolling direction of the steel sheet, and having a composition different from a composition in other portions of the glass coating film. An average value of a deviation angle of a direction of an axis of easy magnetization of crystal grains relative to the rolling direction is 0° or more and 20° or less in a base metal iron portion of the steel sheet 11 at a position along a width direction of the steel sheet, the position corresponding to the linearly altered portion 14.

Abstract: To provide a grain oriented electrical steel sheet that can securely suppress propagation of lateral strain, and can make a product even from a portion where the lateral strain occurs. A grain oriented electrical steel sheet of the present invention has a linearly altered portion 14 generated in a glass coating film 12 at one of side edges of a steel sheet 11, in a continuous line or in a discontinuous broken line in a direction parallel with a rolling direction of the steel sheet, and having a composition different from a composition in other portions of the glass coating film. An average value of a deviation angle of a direction of an axis of easy magnetization of crystal grains relative to the rolling direction is 0° or more and 20° or less in a base metal iron portion of the steel sheet 11 at a position along a width direction of the steel sheet, the position corresponding to the linearly altered portion 14.

Abstract: Provided are a displacement/distortion measuring method and a displacement/distortion measuring apparatus for easily and highly accurately measuring displacement or distortion of an object. An image of the surface of the measuring object is picked up by a line scanner apparatus adhered or brought close to the surface of the measuring object. The image is taken, displacement or distortion is measured by image analysis of the image of the measuring object surface prior to time lapse and that after time lapse, and displacement or distortion measuring results are outputted.

Abstract: A non-oriented electrical steel sheet includes: a base iron (1); and a tension applying type insulating film (2) of not less than 1 g/m2 nor more than 6 g/m2 on a surface of the base iron (1). An oxide layer (3) containing at least one type of oxide selected from the group consisting of Si, Al, and Cr and having a thickness of not less than 0.01 ?m nor more than 0.5 ?m is formed on the surface of the base iron (1).

Abstract: A grain-oriented electrical steel sheet has a tension film that does not include chromium. In the present invention, the tension film, including a phosphate and silica as constituents, includes a manganese compound and a potassium compound. The mole ratio K/Mn of potassium to manganese in the film is set to a certain range. The film can be produced by preparing a coating solution by adding a compound, which includes the phosphate and the silica and also includes the potassium and the manganese, and applying the coating solution on a grain-oriented electrical steel sheet after final annealing is completed, followed by drying and baking.

Abstract: Nitriding process of a steel strip is performed. Next, annealing is performed to form a forsterite based glass coating film at a surface of the steel strip. Heating is performed up to 1000° C. or more in a mixed gas atmosphere containing H2 gas and N2 gas, and a rate of N2 gas is 20 volume % or more, next, the atmosphere is switched into H2 gas atmosphere at the temperature of 1000° C. or more and 1100° C. or less, when the annealing is performed. An oxygen potential P (H2O)/P (H2) is set to be 0.05 to 0.3 when the temperature is 850° C. or less during the heating in the mixed gas atmosphere.

Abstract: Grain-oriented electrical steel sheet having a chrome-free high tensile strength insulating film characterized by comprising steel sheet on the surface of which is formed an insulating film containing a phosphate and colloidal silica as main ingredients and containing crystalline magnesium phosphate uniformly dispersed over the entire surface.

Abstract: The present invention is a grain-oriented electrical steel sheet characterized in that Bi is present at 0.01 to less than 1,000 ppm in terms of mass at the interface of the substrate steel and the primary film of the grain-oriented electrical steel sheet. The grain-oriented electrical steel sheet is produced by any of the processes of: before decarburization annealing, applying preliminary annealing for 1 to 20 sec. at 700° C. or higher and controlling an atmosphere in the temperature range; controlling the maximum attaining temperature B (° C.) before final cold rolling so that the maximum attaining temperature B may satisfy the expression, ?10×ln(A)+1,100?B?10×ln(A)+1,220, in accordance with a Bi content A (ppm) and at the same time heating the steel sheet cold rolled to the final thickness to 700° C. or higher within 10 sec. or at a heating rate of 100° C./sec. or more before decarburization annealing, or immediately thereafter applying preliminary annealing for 1 to 20 sec. at 700° C.

Abstract: A grain-oriented electrical steel sheet has a tension film that does not include chromium. In the present invention, the tension film, including a phosphate and silica as constituents, includes a manganese compound and a potassium compound. The mole ratio K/Mn of potassium to manganese in the film is set to a certain range. However, the manganese described herein does not refer to manganese derived from a manganese phosphate included in raw materials of the film. The film can be produced by preparing a coating solution by adding a compound, which includes the phosphate and the silica and also includes the potassium and the manganese, and applying the coating solution on a grain-oriented electrical steel sheet after final annealing is completed, followed by drying and baking.

Abstract: Provided are a displacement/distortion measuring method and a displacement/distortion measuring apparatus for easily and highly accurately measuring displacement or distortion of an object. An image of the surface of the measuring object is picked up by a line scanner apparatus adhered or brought close to the surface of the measuring object. The image is taken, displacement or distortion is measured by image analysis of the image of the measuring object surface prior to time lapse and that after time lapse, and displacement or distortion measuring results are outputted.