Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Denso Corporation

Tatsuya Takase

Kazutoshi Takeda

Kenji Kosuge

Hiroyasu Fujii

Makoto Taniguchi

Hiroshi Fujimura

Takuya Matsumoto

Atsuo Ishizuka

Kenichi Murakami

Yoshiaki Natori

Hisashi Mogi

Takeaki Wakisaka

Tetsuya Aoki

Keiichi Okazaki

Satoshi Doi

Kohji Muneda

Junichi Takaobushi

Koji Muneda

Tomoji Shono

Disclosed is a method of manufacturing a core sheet. The core sheet has an annular core back portion and a plurality of tooth portions extending from the core back portion toward a radial center thereof. The method includes a blanking step, a rolling step and a removing step. In the removing step, an insulation coating, which is on a region of a grain-oriented magnetic steel sheet for forming a band-shaped core back portion, on a band-shaped core back portion of a sheet piece or on the core back portion of the core sheet, is at least partially removed.

Method of manufacturing core sheet including insulation coating removing step

An electrical steel sheet () is provided with a base iron () and an insulating film () formed on a surface of the base iron (). The insulating film () contains: a first component: 100 parts by mass, the first component containing: a metal phosphate: 100 parts by mass; and one kind selected from a group consisting of an acrylic resin, an epoxy resin and a polyester resin which have an average particle size of 0.05 &#x3bc;m to 0.50 &#x3bc;m, or a mixture or copolymer of two or three kinds selected from the group: 1 part by mass to 50 parts by mass; and a second component composed of dispersion or powder of a fluorine resin having an average particle size of 0.05 &#x3bc;m to 0.35 &#x3bc;m: 0.5 parts by mass to 10 parts by mass.

Electrical steel sheet and method for manufacturing the same

An insulating coating film obtained by mixing 0.5 parts by mass to 10 parts by mass of a copolymer of a fluoroolefin and an ethylenically unsaturated compound when converted into a solid content with 100 parts by mass in solid content of a mixture composed of a metal phosphate and a specific organic resin or a mixture composed of colloidal silica and a specific organic resin is designed to be provided on a surface of an electrical steel sheet, and in this manner, it is possible to obtain an electrical steel sheet having good corrosion resistance under a wet environment and having good properties related to the insulating coating film such as a space factor and adhesiveness.

Electrical steel sheet and method of manufacturing the same

An electrical steel sheet provides: a steel strip () for an electrical steel sheet; and an insulating film () formed at a surface of the steel strip () and containing metal phosphate and organic resin. At least a part of the metal phosphate includes at least one kind of crystal structure selected from a group consisting of a cubic system, a tetragonal system, a hexagonal system, and an orthorhombic system. The organic resin contains at least one kind selected from a group consisting of an acryl-based resin, an epoxy-based resin, and a polyester resin having a carboxyl group or a hydroxyl group at a surface of an emulsion particle for one part by mass to 50 parts by mass relative to 100 parts by mass of the metal phosphate.

Electrical steel sheet and manufacturing method thereof

An electrical steel sheet is provided which is capable of improving heat conductivity. The electrical steel sheet includes: a steel strip () for an electrical steel sheet; and an insulating film () formed at a surface of the steel strip () and containing metal phosphate and organic resin. At least a part of the metal phosphate includes at least one kind of crystal structure selected from a group consisting of a cubic system, a tetragonal system, a hexagonal system, and an orthorhombic system. The organic resin contains at least one kind selected from a group consisting of an acryl-based resin, an epoxy-based resin, and a polyester resin having a carboxyl group or a hydroxyl group at a surface of an emulsion particle for one part by mass to 50 parts by mass relative to 100 parts by mass of the metal phosphate.

This oriented electrical steel sheet is a non-oriented electrical steel sheet consisting of, in mass %: C: not less than 0.0001% and not more than 0.0040%, Si: more than 3.0% and not more than 3.7%, sol.Al: not less than 0.3% and not more than 1.0%, Mn: not less than 0.5% and not more than 1.5%, Sn: not less than 0.005% and not more than 0.1%, Ti: not less than 0.0001% and not more than 0.0030%, S: not less than 0.0001% and not more than 0.0020%, N: not less than 0.0001% and not more than 0.003%, Ni: not less than 0.001% and not more than 0.2%, P: not less than 0.005% and not more than 0.05%, with a balance consisting of Fe and impurities, in which a resistivity &#x3c1; at room temperature &#x2267;60 &#x3bc;&#x3a9;cm, and saturation magnetic flux density Bs at room temperature &#x2267;1.945 T are established, and the components contained satisfy 3.5&#x2266;Si+(&#x2154;)&#xd7;sol.Al+(&#x2155;)&#xd7;Mn&#x2266;4.25.

Non-oriented electrical steel sheet and method of manufacturing non-oriented electrical steel sheet

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Tokyo, Japan

Tatsuya Takase