Nippon Steel Corporation

Nittetsu Plant Designing Corporation

Nippon Steel Sumitomo Metal Corporation

Hiroyasu Fujii

Kazutoshi Takeda

Shuichi Yamazaki

Yoshiyuki Ushigami

Shuichi Nakamura

Shinsuke Takatani

Masaru Takahashi

Kenichi Murakami

Seiki Takebayashi

Osamu Tanaka

Norikazu Fujii

Jun Maki

Fumiaki Takahashi

Takuya Matsumoto

Satoshi Arai

Yutaka Matsumoto

Shigeru Hirano

Takashi Kataoka

Masao Kurosaki

Yoshiaki Natori

Shunsuke Okumura

Yuji Kubo

Masayoshi Tanaka

Hidekuni Murakami

Noriko Yamada

Tomoji Kumano

Hiroaki Masui

Takeshi Imai

Hideyuki Hamamura

Yozo Suga

Katsuro Kuroki

Nobuyuki Takahashi

Tesshu Murakawa

Tadashi Nakayama

Yoshihiro Arita

Takeo Nagashima

Akira Akagi

Masayoshi Suehiro

Hisashi Kobayashi

Hiroyuki Mimura

Kenji Kosuge

Yoshihisa Takada

Haruhiko Eguchi

Norihiro Yamamoto

Hiroki Hori

Tatsuya Takase

Hisaaki Sato

Minako Fukuchi

Shingo Okada

Masato Mizokami

Toru Nagai

Tetsuya Sasaki

Hideyuki Kobayashi

Kazutaka Higashine

Kazufumi Hanzawa

Chikara Kaido

Genichi Shigesato

Kiyoshi Sawano

Morio Shiozaki

Masaaki Sugiyama

Koji Kanehashi

Fumikazu Andou

Katsurou Kuroki

Yusuke Kanto

Yuya Fujii

Yosuke Kurosaki

Hisashi Kabayashi

Takeda Kazutoshi

Isao Koike

Toshinao Yamaguchi

There is provided a non-oriented electrical steel sheet that includes a base metal steel sheet and an insulating coating film that is formed on a surface of the base metal steel sheet, wherein the insulating coating film mainly contains metal phosphate, organic resin, and water-soluble organic compound, the water-soluble organic compound has an SP value that is within a range of 10.0 to 20.0 (cal/cm), the metal phosphate contains aluminum and zinc as metallic elements, and when measurement by an X-ray photoelectron spectroscopy is performed from a surface of the insulating coating film in a thickness direction of the non-oriented electrical steel sheet, a depth at which a strength of a 2p peak of zinc reaches a maximum is present closer to the surface side than a depth at which a strength of a 2p peak of aluminum reaches a maximum, and a maximum value of the strength of the 2p peak of zinc is 1 to 20 times a strength of the 2p peak of aluminum at the depth at which the strength of the 2p peak of zinc reaches a maximum.

Non-oriented electrical steel sheet and surface treatment agent for non-oriented electrical steel sheet

There is provided a non-oriented electrical steel sheet that includes a base metal steel sheet and an insulating coating film that is formed on a surface of the base metal steel sheet, wherein the insulating coating film mainly contains metal phosphate, organic resin, and water-soluble organic compound, the metal phosphate contains at least aluminum as a metallic element, the organic resin has an SP value being within a range of 18.0 (MPa)or more to less than 24.0 (MPa), the water-soluble organic compound has an SP value being within a range of 19.0 (MPa)or more to less than 35.0 (MPa), and when measurement by X-ray diffractometry is performed on the insulating coating film, a degree of crystallinity of aluminum phosphate calculated from a peak from the metal phosphate is within a range of 0.5 to 5.0%.

Non-oriented electrical steel sheet

This grain-oriented electrical steel sheet includes a steel sheet, an insulation coating disposed on the steel sheet, and a spinel present at a part on the steel sheet at an interface between the steel sheet and the insulation coating by being fitted into the insulation coating, in which an amount of the spinel is 5 to 50 mg/mper unit area of a surface of the steel sheet.

Grain-oriented electrical steel sheet and manufacturing method of the same

This manufacturing method of a grain-oriented electrical steel sheet is a manufacturing method of a grain-oriented electrical steel sheet having no forsterite film, in which in a decarburization annealing process, a cold-rolled steel sheet is (i-1) heated at an average heating rate (HR1) of 40 to 500° C./sec in a temperature range of 550° C. or higher and lower than 720° C., (i-2) heated at an average heating rate (HR2), which is 5 to 50° C./sec, in a temperature range of 720° C. to T1° C. (770° C.≤T1 (° C.)≤900° C.), and (ii) retained at the temperature of T1° C. for 50 to 1000 seconds to make an amount of C 25 ppm or less in an atmosphere of an oxygen partial pressure (P1) which is 0.0010 to 0.20.

Manufacturing method of grain-oriented electrical steel sheet

A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet having a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or to multiple cold rolling processes having intermediate annealing performed between cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing using a decarburization annealing furnace including a heating area and a soaking area; and a final annealing process of applying an annealing separator having alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing, wherein, in the decarburization annealing process, when X represents the Cr content of the silicon steel material in terms of mass %, an oxidation degree P1 of an atmosphere gas in the heating area satisfies the following Expression 1 and an oxidation degree P2 of an atmosphere gas in the soaking area satisfies the following Expression 2:0.18−0.008≤1≤0.25+0.15≤0.20  (Expression 1); and0.01≤2≤0.15  (Expression 2).

Method for manufacturing grain-oriented electrical steel sheet

A non-oriented electrical steel sheet according to one embodiment of the present invention includes a base metal steel sheet, and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet, wherein: a content of Zn in the composite coating film is 10 mg/mor more per side; and the product of an amount of oxygen in the base metal steel sheet and a sheet thickness of the base metal steel sheet is 50 ppm·mm or less.

Non-oriented electrical steel sheet and method for producing same

Provided is an electric motor which includes an adhesively-laminated core for a stator having excellent productivity and high mechanical strength and that is thus capable of reducing vibration and noise of an electric motor and suppressing iron loss. The adhesively-laminated core for a stator includes electrical steel sheets laminated on each other and each coated on both sides with an insulation coating, and an adhesion part disposed between the electrical steel sheets adjacent to each other in a stacking direction and configured to cause the electrical steel sheets to be adhered to each other. All sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered by the adhesion part, an adhesive forming the adhesion part includes a fast-curing type adhesive and a thermosetting adhesive, and the adhesion part is partially provided between the electrical steel sheets adjacent to each other in the stacking direction.

Adhesively-laminated core for stator, method of manufacturing the same, and electric motor

A coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which contains boric acid and hydrated silicate particles containing aluminum, and a method for producing a grain-oriented electrical steel sheet comprising applying the coating liquid to a grain-oriented electrical steel sheet after final annealing, and then performing a baking treatment.

Coating liquid for forming insulation coating for grain-oriented electrical steel sheets, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet

A grain-oriented electrical steel sheet according to an aspect of the present invention includes an underlying steel sheet and a tension-insulation coating arranged on the surface of the underlying steel sheet, and a ten-point average roughness RzL in an L direction obtained when the tension-insulation coating is removed from the grain-oriented electrical steel sheet with an alkaline solution, and then the surface of the underlying steel sheet is measured in a rolling direction is 6.0 μm or less.

Grain-oriented electrical steel sheet, and steel sheet serving as base sheet for grain-oriented electrical steel sheet

A non-oriented electrical steel sheet according to one embodiment of this invention includes a base metal steel sheet and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet. A molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after the non-oriented electrical steel sheet is boiled for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/mor more. The method for determining the amount of soluble Zn is in accordance with JIS K 0102: 2016 'Testing Methods for Industrial Wastewater', 53.3 “ICP Emission Spectroscopy”.

A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing; and a final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing.

In the present invention, there is provided a coating liquid for forming an insulation coating for a grain-oriented electrical steel sheet, including: a solvent; and one or two more layered clay mineral powders having a specific surface area of 20 m/g or more. In addition, in the present invention, there is provided a grain-oriented electrical steel sheet including: a base metal; and an insulation coating provided on a surface of the base metal, in which the insulation coating contains SiO, and one or two of AlOand MgO, and has a porosity of 10% or less.

Coating liquid for forming insulation coating for grain-oriented electrical steel sheet, method of manufacturing grain-oriented electrical steel sheet, and grain-oriented electrical steel sheet

A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.010% or less of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.020% or less of S; and a balance comprising Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiOintermediate oxide film layer with an average thickness of 1.0 nm to 1.0 μm at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, when a surface of the intermediate oxide film layer is analyzed by an infrared reflection spectroscopy, a peak intensity Iat 1250 cmand a peak intensity Iat 1200 cmsatisfy I/I≥0.010.

Grain oriented electrical steel sheet and producing method thereof

Provided is an electric motor using a laminated core in which punched electrical steel sheets are adhered to each other with a high adhesion strength. The laminated core includes: a plurality of electrical steel sheets which are stacked on each other and of which both surfaces are coated with an insulation coating; and an adhesion part which is disposed between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, wherein all sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered to each other by the adhesion parts, wherein the adhesion parts are provided at a plurality of positions between the electrical steel sheets, and wherein the adhesion part is a layer made of an adhesive containing any one or both of an acrylic resin and an epoxy resin and having an SP value of 7.8 to 10.7 (cal/cm).

Laminated core, laminated core manufacturing method, and electric motor

This non-oriented electrical steel sheet includes a base steel sheet (); and an insulation coating () formed on a surface of the base steel sheet (), in which the insulation coating () contains a metal phosphate and an organic resin, an arithmetic mean of a center line average roughness Raof the insulation coating () in a rolling direction of the base steel sheet () and a center line average roughness Raof the insulation coating () in a direction perpendicular to the rolling direction is 0.20 to 0.50 μm, and the amount of nitrogen in the insulation coating () is 0.05 to 5.00 mass %.

Non-oriented electrical steel sheet and method for manufacturing same

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Tokyo, Japan

Hiroyasu Fujii