公开(公告)号：US20230243010A1

公开(公告)日：2023-08-03

申请号：US18008927

申请日：2021-06-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi KATAOKA ,  Haruhiko ATSUMI ,  Ryutaro YAMAGATA ,  Nobusato MORISHIGE ,  Kazutoshi TAKEDA

IPC: C21D8/12 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  C22C38/06 ,  C22C38/00 ,  C22C38/16 ,  C21D9/46 ,  C21D3/04

CPC classification number: C21D8/1283 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  C22C38/06 ,  C22C38/001 ,  C22C38/16 ,  C21D9/46 ,  C21D3/04 ,  C21D8/1222 ,  C22C38/002 ,  C21D8/1272 ,  C21D2201/05

Abstract: Provided is a production method for a grain-oriented electrical steel sheet that is thin and has excellent magnetic characteristics. An embodiment of the present invention provides a production method that is for a grain-oriented electrical steel sheet and that comprises: a hot rolling step; an optional hot-rolled sheet-annealing step; an acid-washing step; a cold rolling step; a primary recrystallization-annealing step; a finishing-annealing step; and a planarization-annealing step. In the acid-washing step, an acid-washing solution containing 0.0001-5.00 g/L of Cu is used. The thickness of a cold-rolled steel sheet is 0.15-0.23 mm. The average temperature increase rate in the temperature range of 30-400° C. in a temperature increase process in the primary recrystallization step is more than 50° C./sec but not more than 1000° C./sec.

公开(公告)号：US20230139246A1

公开(公告)日：2023-05-04

申请号：US17918570

申请日：2021-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Miho TOMITA ,  Kazutoshi TAKEDA ,  Takuya MATSUMOTO

IPC: H01F1/147 ,  C22C38/60 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00

Abstract: 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: 4.0 to 5.0%, Mn: 0.20% or less Al: 0.010% or more and less than 0.050%, P: 0.030% or less, S: 0.0030% or less, N: 0.0005 to 0.0030%, 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, 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.

公开(公告)号：US20230064468A1

公开(公告)日：2023-03-02

申请号：US17795432

申请日：2021-06-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Kazutoshi TAKEDA ,  Minako FUKUCHI ,  Shinsuke TAKATANI ,  Shuichi YAMAZAKI

IPC: H01F1/18 ,  B32B15/01 ,  H01F41/02

Abstract: This electrical steel sheet includes a base steel sheet, a first insulation coating formed on a first surface of the base steel sheet and having adhesiveness, and a second insulation coating formed on a second surface of the base steel sheet which is a back surface to the first surface and having adhesiveness, in which an average pencil hardness of the first insulation coating is HB or higher and 3H or lower, and an average pencil hardness of the second insulation coating is higher than the average pencil hardness of the first insulation coating.

公开(公告)号：US20230033301A1

公开(公告)日：2023-02-02

申请号：US17778178

申请日：2020-11-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyasu FUJII ,  Jun MAKI ,  Kazutoshi TAKEDA ,  Akira AKAGI ,  Hiroyuki MIMURA

IPC: H01F1/147 ,  B05D7/14 ,  B05D3/02 ,  H01F41/02 ,  C08K3/32

Abstract: 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/m2 or 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.

公开(公告)号：US20220098692A1

公开(公告)日：2022-03-31

申请号：US17421845

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Ichiro TANAKA ,  Tomoya SUENAGA ,  Takashi KATAOKA ,  Yuki KUNITA

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C22/18 ,  C23C22/20 ,  C23C22/74 ,  C23C28/04 ,  C23G1/08

Abstract: The grain-oriented electrical steel sheet is a grain-oriented electrical steel sheet which does not have an inorganic coating containing forsterite as a main component, including a base steel sheet having a predetermined chemical component, a silicon-containing oxide layer provided on the base steel sheet, an iron-based oxide layer provided on the silicon-containing oxide layer, and a tension-insulation coating provided on the iron-based oxide layer, having a thickness of 1 to 3 μm, and containing phosphate and colloidal silica as main components. When elemental analysis is performed from a surface of the tension-insulation coating in a sheet thickness direction by glow discharge optical emission spectrometry, predetermined requirements are satisfied.

公开(公告)号：US20220090242A1

公开(公告)日：2022-03-24

申请号：US17427535

申请日：2020-02-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takashi KATAOKA ,  Kazutoshi TAKEDA ,  Masamitsu KUBOTA ,  Hirotoshi TADA

IPC: C22C38/20 ,  C22C38/34 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C21D9/46 ,  C21D8/02 ,  C21D3/04 ,  C23G1/08 ,  C22C38/60

Abstract: A grain oriented electrical steel sheet includes a base steel sheet, an oxide layer, and a tension-insulation coating. When a glow discharge spectroscopy is conducted in a region from a surface of the tension-insulation coating to an inside of the base steel sheet, a sputtering time Fe0.5 at which a Fe emission intensity becomes 0.5 times as compared with a saturation value thereof and a sputtering time Fe0.05 at which a Fe emission intensity becomes 0.05 times as compared with the saturation value satisfy (Fe0.5−Fe0.05)/Fe0.5≥0.35. A maximal point of a Cr emission intensity is included between the Fe0.05 and the Fesat. Moreover, a magnetic flux density B8 in a rolling direction of the grain oriented electrical steel sheet is 1.90 T or more.

公开(公告)号：US20220028607A1

公开(公告)日：2022-01-27

申请号：US17311425

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryu HIRAYAMA ,  Kazutoshi TAKEDA

IPC: H01F41/02 ,  H02K1/16 ,  H02K1/18 ,  H01F27/245

Abstract: A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part which is provided between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, in which the electrical steel sheet include an annular core back part, and a plurality of tooth parts which extend from the core back part in a radial direction of the core back part and are disposed at intervals in a circumferential direction of the core back part, an adhesion region in which the adhesion part is provided is formed in the core back part of the electrical steel sheet, and the adhesion region extends in a direction along a magnetic flux passing through a region of the electrical steel sheet in contact with the adhesion region.

公开(公告)号：US20220025228A1

公开(公告)日：2022-01-27

申请号：US17296583

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Shinsuke TAKATANI ,  Hiroyasu FUJII ,  Kazutoshi TAKEDA

IPC: C09J163/00 ,  B32B7/12 ,  B32B15/01 ,  C09J151/08 ,  C09J11/06 ,  C09J133/12 ,  H02K1/12 ,  H02K15/02

Abstract: 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/cm3)1/2.

公开(公告)号：US20220020530A1

公开(公告)日：2022-01-20

申请号：US17294955

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryu HIRAYAMA ,  Kazutoshi TAKEDA

IPC: H01F41/02 ,  H02K1/18 ,  H01F27/245

Abstract: A laminated core includes a plurality of electrical steel sheets stacked on each other and coated with an insulation coating on both surfaces thereof, and an adhesion part provided between the electrical steel sheets adjacent to each other in a stacking direction and configured to adhere the electrical steel sheets to each other, wherein an adhesion area ratio of the electrical steel sheet by the adhesion part is 1% or more and 40% or less.

公开(公告)号：US20210343466A1

公开(公告)日：2021-11-04

申请号：US17295781

申请日：2019-12-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Rei HONMA ,  Ryu HIRAYAMA ,  Kazutoshi TAKEDA

IPC: H01F27/245 ,  H01F27/26 ,  H02K15/02

Abstract: A laminated core according to an aspect of the present invention includes a plurality of electrical steel sheets stacked to each other; and a plurality of adhesion parts that are provided between the electrical steel sheets adjacent to each other in a stacking direction and adhere the electrical steel sheets to each other, in which, when viewed in the stacking direction, the plurality of adhesion parts are formed in a belt shape that extends in a first direction, the plurality of adhesion parts are arranged in a second direction orthogonal to the first direction, and an angle formed by the first direction and a rolling direction of the electrical steel sheet is 30° or more and 90° or less.