A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α.sub.1 β.sub.1 γ.sub.1) and (α.sub.2 β.sub.2 γ.sub.2) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as [(α.sub.2−α.sub.1).sup.2+(β.sub.2−β.sub.1).sup.2+(γ.sub.2−γ.sub.1).sup.2].sup.1/2≥0.5°, and the boundary condition BB is defined as [(α.sub.2−α.sub.2).sup.2+(β.sub.2−β.sub.1).sup.2+(γ.sub.2−γ.sub.1).sup.2].sup.1/2≥2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.

The present invention provides an annealing separator composition for a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet and a method for manufacturing a grain-oriented electrical steel sheet. An annealing separator composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: 100 parts by weight of at least one of magnesium oxide and magnesium hydroxide; 5 to 200 parts by weight of aluminum hydroxide; and 0.1 to 20 parts by weight of a boron compound.

The invention involves producing discontinuous, flake-shaped particles of a soft magnetic material, coating the flake-shaped particles with an electrically insulating coating, and consolidating the coated flaked-shaped particles to form a soft magnetic bulk shape. The consolidated bulk shape can comprise a layer or a simple or complex 3D magnet part shape, which has a consolidated layered microstructure that includes laminated soft magnetic regions that are substantially encapsulated by an electrical insulating layer to increase the resistivity of soft magnetic material, especially when used in silicon iron magnet parts.

An electrical steel sheet provided with an insulating coating is disclosed. Therefore, a pre-treatment liquid used on an electrical steel sheet having a forsterite coating on a surface thereof is provided before applying an insulating coating treatment liquid containing at least one salt selected from the group consisting of phosphate, borate, and silicate, the pre-treatment liquid. The pre-treatment liquid includes: at least one inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid, and phosphoric acid; and acetic acid, wherein a content of the acetic acid is not less than 1 mass ppm and not more than 3000 mass ppm.

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 H.sub.2O/N.sub.2 of 0.6 to 1.6 and a percentage of particles with a particle size of 40 .Math.m or more in a slurry state of 5 mass% or less.

The invention relates to a method for producing an electrical sheet pack using an anaerobically curing adhesive, to an electrical sheet pack produced or producible by such a method, and to a device for creating an electrical sheet pack of the invention.

A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α.sub.1 β.sub.1 γ.sub.1) and (α.sub.2 β.sub.2 γ.sub.2) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as |γ.sub.2−γ.sub.1|≥0.5°, and the boundary condition BB is defined as [(α.sub.2−α.sub.1).sup.2+(β.sub.2−β.sub.1).sup.2+(γ.sub.2−γ.sub.1).sup.2].sup.1/2≥2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.

A grain-oriented electrical steel sheet according to the present invention includes a silicon steel sheet as a base steel sheet, and when an average value of amplitudes in a wavelength range of 20 to 100 μm among wavelength components obtained by performing Fourier analysis on a measured cross-sectional curve parallel to a sheet width direction of the silicon steel sheet is set as ave-AMP.sub.C100, ave-AMP.sub.C100 is 0.0001 to 0.050 μm.

To improve and stabilize magnetic properties, a steel sheet is soaked in a temperature range of 1000° C. or more and 1120° C. or less for 200 sec or less and then soaked in a temperature range of 650° C. or more and 1000° C. or less for 200 sec or less in annealing before final cold rolling, and the amount of Al in precipitates after the annealing before the final cold rolling is limited to 50% or more of the total amount of Al contained in the steel slab.

A grain-oriented electrical steel sheet includes: a base steel sheet; an intermediate layer arranged in contact with the base steel sheet; and an insulation coating arranged in contact with the intermediate layer to be an outermost surface, in which the intermediate layer has a local oxidized area when viewing a cross section whose cutting direction is parallel to a thickness direction, and a thickness of the intermediate layer in an area where the local oxidized area is included is 50 nm or more, and a thickness of the intermediate layer in an area where the local oxidized area is not included is less than 50 nm.