Abstract: A treatment agent for chromium-free insulating coating formation suitable for forming an insulating coating on a surface of a grain-oriented electrical steel sheet. The treatment agent includes components (A), (B), (C), and (D). The component (B) is contained in an amount of 50 to 150 parts by mass on a SiO2 solid basis, and the component (C) is contained in an amount of 5.0 parts by mass or more on an elemental metal basis, the amounts being based on 100 parts by mass, on a solid basis, of the component (A). The component (D) is contained in an amount that a molar ratio of M2+ and M3+, each being a metal element in the treatment agent for chromium-free insulating coating formation, to a phosphorus element P satisfies a specified relationship, and the treatment agent for chromium-free insulating coating formation has a pH of less than 4.5.

Abstract: An electrical steel sheet with an insulating film, the steel sheet having an insulating film containing a crystalline fibrous material on a surface of the steel sheet, in which a ratio (LRD/LTD) of a length in a rolling direction (LRD) of the crystalline fibrous material in a cross section in the rolling direction of the insulating film to a length in a direction perpendicular to the rolling direction (LTD) of the crystalline fibrous material in a cross section in the direction perpendicular to the rolling direction of the insulating film is 1.5 or more and 50.0 or less.

Abstract: Provided is a grain-oriented electrical steel sheet having a film that is effective for the magnetic properties of the steel sheet and particularly effective for iron loss reduction and has favorable adhesion. In a grain-oriented electrical steel sheet, an insulating film partially enters into a steel substrate to form an anchor part, a depth of the anchor part from the surface of the steel substrate is 3.5 ?m or less, and a number of neck parts of 5 ?m2 or less in area is 0.06/?m2 or less and a number of neck parts of 10 ?m2 to 40 ?m2 in area is 0.005/?m2 or more and 0.011/?m2 or less, where each neck part is a remaining part of the insulating film on the surface of the steel substrate when peeling the insulating film from the steel substrate in a bend test for the grain-oriented electrical steel sheet.

Abstract: Provided is an annealing separator with which a grain-oriented electrical steel sheet having a forsterite film with excellent appearance uniformity and adhesion can be obtained. The annealing separator for grain-oriented electrical steel sheet comprises: magnesia that contains 0.05 mass % or more and 0.20 mass % or less of B and 0.01 mass % or more and 0.10 mass % or less of P, and titanium oxide in 1.0 part by mass or more and 10.0 parts by mass or less per 100 parts by mass of the magnesia where the titanium oxide contains one or more types of alkali metals in a total amount of 0.0050 mass % or more and 0.50 mass % or less, where an amount of P adsorbed on per 1 g of the titanium oxide is 1.5×10?4 g or more and 1.0×10?3 g or less.

Abstract: Provided is a method for manufacturing a grain-oriented electrical steel sheet with excellent uniformity of magnetic properties in the sheet transverse direction without increasing production costs. An ignition loss of an annealing separator after drying: IGLOSS (mass %), a storage time of a cold-rolled steel sheet: T (hr), and a carbon dioxide concentration in a storage environment of the cold-rolled steel sheet: A (mass ppm) satisfy the following formula (1): A × IGLOSS ? - 1500 × Ln ? ( T ) + 9000.

Abstract: In determining the conditions for final annealing, information on the concentration of enriched components over the entire length and width of the steel sheet after decarburization annealing is obtained, the optimum function of product properties in the relationship between enriched components and control conditions for final annealing is obtained in advance, and the distribution of the control conditions for final annealing within the coil were considered while determining the control conditions for final annealing such that the area where the deviation of the product properties from the above optimum function is within a range of ±? is maximized over the entire length and width.

Abstract: To provide a grain-oriented electrical steel sheet with good processing accuracy in rounding while maintaining excellent magnetic properties, and a producing method thereof. Disclosed is the method including: subjecting a steel material to heating to 1300° C. or higher and hot rolling, subjecting the resulting sheet directly, or after subjection to hot-rolled sheet annealing, to at least two cycles of cold rolling with intermediate annealing therebetween, decarburization annealing, application of an annealing separator to a surface of the sheet, final annealing, in which maximum arrival temperatures in the first and second cycles of the cold rolling satisfy a predetermined relation, total rolling reductions in the first and second cycles of the cold rolling satisfy a predetermined relation, and in the final annealing, an average heating rates in temperature ranges from 50° C. to 1000° C. and from 1000° C. to (maximum arrival temperature—50° C.) satisfy a predetermined relation.

Abstract: To provide a method of producing a grain-oriented electrical steel sheet whereby greater purification of an inhibitor-strengthening element can be promoted by improvement of an annealing separator and, as a result, iron loss can be effectively improved. The annealing separator contains 1 to 10 parts by mass of a composite oxide, relative to 100 parts by mass of MgO, the composite oxide containing at least one selected from a Group 1: Fe, Mn, Al and Ca, and at least one of a Group 2: Zr, Ta, Mo and Nb.

Abstract: A method for forming a film on a surface of a steel sheet includes applying a treatment solution for forming a film containing a fibrous material to the surface of the steel sheet by using a coater under a condition in which a difference between a speed of the steel sheet and a speed of an applicator of the coater is 1.0 m/min or more, inclining the surface of the steel sheet, to which the treatment solution for forming a film has been applied, at an angle of 10° or more with respect to a horizontal plane until drying is started, and thereafter drying the steel sheet.

Abstract: An insulating coating treatment liquid for forming a chromium-free insulating coating on a surface of a grain-oriented electrical steel sheet, the insulating coating treatment liquid including at least one phosphate salt selected from phosphate salts of any of Mg, Ca, Ba, Sr, Zn, Al, and Mn and including colloidal silica and particles of a metal-element-containing compound. A content of the colloidal silica in terms of SiO2, on a solids basis, is 50 to 120 parts by mass, and a content of the particles of a metal-element-containing compound in terms of elemental metal is 5 to 60 parts by mass, per 100 parts by mass of the at least one phosphate salt, and the insulating coating treatment liquid has a thixotropic index (TI) of 1.00 or greater and 10.00 or less.

Abstract: An electrical steel sheet with an insulating film, the steel sheet having an insulating film containing a crystalline fibrous material on a surface of the steel sheet, in which a ratio (LRD/LTD) of a length in a rolling direction (LRD) of the crystalline fibrous material in a cross section in the rolling direction of the insulating film to a length in a direction perpendicular to the rolling direction (LTD) of the crystalline fibrous material in a cross section in the direction perpendicular to the rolling direction of the insulating film is 1.5 or more and 50.0 or less.

Abstract: A method for forming a film on a surface of a steel sheet includes applying a treatment solution for forming a film containing a fibrous material to the surface of the steel sheet by using a coater under a condition in which a difference between a speed of the steel sheet and a speed of an applicator of the coater is 1.0 m/min or more, inclining the surface of the steel sheet, to which the treatment solution for forming a film has been applied, at an angle of 10° or more with respect to a horizontal plane until drying is started, and thereafter drying the steel sheet.

Abstract: Provided is an annealing separator with which a grain-oriented electrical steel sheet having a forsterite film with excellent appearance uniformity and adhesion can be obtained. The annealing separator for grain-oriented electrical steel sheet comprises: magnesia that contains 0.05 mass % or more and 0.20 mass % or less of B, a phosphate in 0.1 parts by mass or more and 1.0 part by mass or less in terms of P per 100 parts by mass of the magnesia, and titanium oxide in 1.0 part by mass or more and 10.0 parts by mass or less per 100 parts by mass of the magnesia where the titanium oxide contains one or more types of alkali metals in a total amount of 0.050 mass % or more and 1.0 mass % or less, where an amount of P adsorbed on per 1 g of the titanium oxide is 1.0×10?4 g or less.

Abstract: An insulating coating-attached electrical steel sheet has, on at least one surface, an insulating coating including an insulating tensile coating layer A. A tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×?A or more, where M is a weight of the insulating tensile coating layer A, and ?A is the tension applied to the steel sheet by the insulating tensile coating layer A. The insulating coating-attached electrical steel sheet has excellent adhesion of the insulating coating. A method for manufacturing the insulating coating-attached electrical steel sheet is also provided.

Abstract: An annealing separator, by being applied to a steel sheet, enables retention of a good shape of a coil after annealing obtained by winding the steel sheet with the annealing separator applied thereto into a coil which is then annealed at a high temperature exceeding 1000° C. A powder used as the annealing separator: contains magnesium oxide as a main component and B: 0.020 mass % or more and 0.200 mass % or less, SO3: 0.030 mass % or more and 2.000 mass % or less, and P2O3: 0.050 mass % or more and 1.000 mass % or less; and contains 0.2 mass % or more and 5.0 mass % or less of particles having a particle size of more than 45 ?m and 75 ?m or less. The particles having this particle size contain (boron) B: 0.002 mass % or more and less than 0.020 mass %, SO3: less than 0.030 mass %, and P2O3: less than 0.050 mass %.

Abstract: A grain-oriented electrical steel sheet having an insulating film disposed on a surface thereon. The insulating film having a chemical composition comprising Si, P, O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, Mn, and Co. The insulating film has a crystallinity in a range of 20% or more, and a minimum tension provided to the steel sheet by the insulating film at a temperature in a range of 100° C. to 200° C. is 10 MPa or more.

Abstract: Provided is a method for stably producing a grain-oriented electrical steel sheet with excellent magnetic properties by effectively purifying inhibitors. The method for producing a grain-oriented electrical steel sheet includes using a steel slab containing a predetermined amount of at least one of Ti, Zr, Hf, V, Nb, and Ta, and applying an annealing separator, in which 1 part by mass to 10 parts by mass of a metal compound is added with respect to 100 parts by mass of MgO, on the steel sheet surface with a ratio of particles with a particle size of 1 ?m or more in the metal compound being 0.0010 particles/?m2 or less.

Abstract: A grain oriented electrical steel sheet has excellent insulation property and includes: a steel sheet; and a coating disposed on each of both surfaces of the steel sheet, wherein an interlaminar current value after a rubbing test is not more than 0.10 A, the rubbing test being conducted by stacking two sheets of the grain oriented electrical steel sheet and rubbing the two sheets against each other to make 90 reciprocations under conditions of a surface pressure of 200 Pa, a rubbing speed of 0.10 m/s, and a reciprocating stroke of 50 mm.

Abstract: To stably produce grain-oriented electrical steel sheets with excellent film properties and magnetic properties. A method of producing a grain-oriented electrical steel sheet of this disclosure comprises subjecting a steel slab containing predetermined additive elements to hot rolling; subjecting the hot-rolled sheet to cold rolling to have a final sheet thickness; subjecting the cold-rolled sheet to decarburization annealing; applying an annealing separator having MgO as a main component to the decarburization annealing sheet; and subjecting the decarburization annealing sheet to finish annealing. The main component of the annealing separator has a BET specific surface area ratio H2O/N2 of 0.6 to 1.6 and a percentage of particles with a particle size of 40 µm or more in a slurry state of 5 mass% or less.

Abstract: Provided is a powder for annealing separator that is used for a grain-oriented electrical steel sheet and enables obtainment of a grain-oriented electrical steel sheet having excellent magnetic properties as a result of favorable purification of impurities in steel. The powder for annealing separator contains magnesium oxide as a main component, and has a nitrogen gas permeability of 0.020 cm/s or more and 0.50 cm/s or less in a state of being applied between coiled steel sheets before start of secondary recrystallization.