Nippon Steel Corporation

Nippon Steel & Sumitomo Metal Corporation

Yoshiaki Natori

Hiroyoshi Yashiki

Kazutoshi Takeda

Takuya Matsumoto

Tesshu Murakawa

Miho Tomita

Minako Fukuchi

Kenichi Murakami

Hiroshi Fujimura

Takeaki Wakisaka

Fumiaki Takahashi

Hiroyasu Fujii

Shuichi Yamazaki

Masafumi Miyazaki

Koji Fujita

Takashi Morohoshi

Hirotoshi Tada

Masaru Takahashi

Shinsuke Takatani

Ichiro Tanaka

Nobusato Morishige

Hiroki Hori

Susumu Mukawa

Hisashi Mogi

Seiki Takebayashi

Takeru Ichie

Tatsuya Takase

Yuuya Gohmoto

O Uyama

Tomoji Shono

Junichi Takaobushi

This non-oriented electrical steel sheet has a predetermined chemical composition, and in which the tensile strength is 580 MPa or more, the average grain size of a recrystallization part of base iron is 50 μm or less, and in inclusions having an equivalent circle diameter of 1 μm or more and an S content of 5 mass % or more contained in base iron, the number of inclusions having a Mg content of more than 5 mass % and a Mn content of 5 mass % or more is 5 times or more the number of inclusions having a Mg content of 5 mass % or less and a Mn content of 5 mass % or more.

Non-oriented electrical steel sheet and manufacturing method therefor

The rotating electrical machine includes a stator, a rotor, and a casing that accommodates the stator and the rotor, in which at least one of the following conditions 1 and 2 is satisfied.

Rotating electrical machine, stator core and rotor core set, method for manufacturing rotating electrical machine, method for manufacturing non-oriented electrical steel sheet for stator and non-oriented electrical steel sheet for rotor, method for manufacturing stator and rotor, and non-oriented electrical steel sheet set

A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass %, C: 0.0010 to 0.0040%, Si: 3.5 to 4.9%, Mn: 0.05 to 0.20%, Al: 0.05 to 0.45%, P: 0.030% or less, S: 0.0030% or less, N: 0.0030% or less, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, and satisfying [4.0≤Si+Al≤5.0], in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 μm in a depth direction of the base metal.

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

This electrical steel sheet contains, as a chemical composition, by mass %, C: 0.0035% or less, Si: 2.00% to 3.50%, Mn: 2.00% to 5.00%, P: 0.050% or less, S: 0.0070% or less, Al: 0.15% or less, N: 0.0030% or less, Ni: 0% to 1.00%, Cu: 0% to 0.10%, and a remainder: Fe and impurities, in which an X-ray random intensity ratio in a {100} <011> crystal orientation on a sheet surface is 15.0 to 50.0, and magnetic flux densities in 0°, 22.5°, and 45° directions from a rolling direction each satisfy [1.005×(B(0°)+B(45°))/2≥B(22.5°)].

Electrical steel sheet and method for manufacturing same

A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing α-γ transformation, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl}<uvw> orientation (within a tolerance of 10°) when measured by EBSD is denoted as Ahkl-uvw, A411−011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 μm to 40.0 μm.

Non-oriented electrical steel sheet

A non-oriented electrical steel sheet has a chemical composition containing, in terms of % by mass, C: 0.0015% or less and Si: 2.5 to 4.0% and having an average crystal grain size of 10 to 40 μm, and an internal oxidation layer having a thickness of 0.5 to 3.0 μm present in a sheet thickness direction of a surface thereof.

Non-oriented electrical steel sheet, segmented stator, and rotating electrical machine

This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+sol. Al+0.5×Mn≥4.3], and an average grain size of the base metal is more than 40 μm and 120 μm or less.

This non-oriented electrical steel sheet contains a base material having a chemical composition including, in mass %, Si: 3.2 to 4.5%, wherein the tensile strength is 550 MPa or more, and a ratio (P/Fe)between a peak-to-peak height Feof Fe at 700 eV and a peak-to-peak height Pof P at 120 eV when crystal grain boundaries are measured through Auger electron spectroscopy is not more than twice a ratio (P/Fe)between a peak-to-peak height Feof Fe at 700 eV and a peak-to-peak height Pof P at 120 eV when the inside of crystals is measured through Auger electron spectroscopy.

Non-oriented electrical steel sheet, production method for non-oriented electrical steel sheet, electric motor and production method for 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

A non-oriented electrical steel sheet has a chemical composition in which α-γ transformation can occur and which contains at least, in terms of mass %, at most 0.010% of C, 1.50% to 4.00% of Si, 0.0001% to 1.0% of sol. Al, at most 0.010% of S, at most 0.010% of N, and a total of 2.50% to 5.00% of at least one selected from the group consisting of Mn, Ni, and Cu, with the balance including Fe and impurities, wherein when an average grain size of {411} crystal grains is defined as dand an average grain size of {111} crystal grains is defined as d, d/d≥1.10.

A rotating electrical machine includes a stator, a rotor, and a casing that accommodates the stator and the rotor, in which a {111}<211> orientation intensity (A) of a core material of the stator is in a range of 2 to 30, a {111}<211> orientation intensity (B) of a core material of the rotor is in a range of 1 to 15, and both the orientation intensities satisfy a relationship of an expression (1) A>B.

Rotating electrical machine, stator core and rotor core set, method for manufacturing rotating electrical machine, method for manufacturing non-oriented electrical steel sheet, method for manufacturing rotor and stator of rotating electrical machine, and non-oriented electrical steel sheet set

A non-oriented electrical steel sheet of the present invention has a chemical composition capable of causing α-γ transformation, and contains 0.0005% to 0.0050% of Ti, in which, in a case where an area ratio of grains having a crystal orientation of an {hkl}<uvw> orientation (within a tolerance of 10°) when measured by EBSD is denoted as Ahkl-uvw, A411-011 is 15.0% or more, and the non-oriented electrical steel sheet has an average grain size of 10.0 μm to 40.0 μm.

This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+0.5×Mn≥4.3], and an average grain size of the base metal is more than 40 μm and 120 μm or less.

An electrical steel sheet is described, which has an insulating coating on its surface. The insulating coating is free of chromium and comprises plate-like particles of inorganic compound and a metal phosphate. The plate-like particles of inorganic compound are in the form of secondary particles, which are formed by aggregating primary particles, and present in an amount of not less than 0.1 parts by mass and not greater than 20 parts by mass, with respect to 100 parts by mass of the metal phosphate. The secondary particles have an average particle diameter of no less than 0.05 &#x3bc;m and no greater than 5 &#x3bc;m, and have a specific surface area of 1 to 80 m/g. The primary particles have an aspect ratio of 50 to 1000. The electrical steel sheet has excellent heat resistance, corrosion resistance, appearance, and insulating properties.

Electrical steel sheet

A grain-oriented electrical steel sheet includes a steel layer and an insulation coating arranged in directly contact with the steel layer thereon. The steel layer includes, as a chemical composition, by mass %, 2.9 to 4.0% of Si, 2.0 to 4.0% of Mn, 0 to 0.20% of Sn, and 0 to 0.20% of Sb. In the steel layer, a silicon content and a manganese content expressed in mass % satisfy 1.2%&#x2264;Si&#x2212;0.5&#xd7;Mn&#x2264;2.0%, and a tin content and an antimony content expressed in mass % satisfy 0.005%&#x2264;Sn+Sb&#x2264;0.20%.

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Tokyo, Japan

Yoshiaki Natori