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公开(公告)号：US12168809B2
公开(公告)日：2024-12-17
申请号：US17797384
申请日：2021-02-19
Applicant: NIPPON STEEL CORPORATION
Inventor： Yoshihiro Arita , Takeru Ichie , Fuminobu Murakami
Abstract: A hot-rolled steel sheet for a non-oriented electrical steel sheet according to one aspect of the present invention contains, by mass %, C: 0.0050% or less, Si: 0.5% or more and 3.5% or less, Mn: 0.1% or more and 1.5% or less, Al: 0.1% or more and 1.5% or less, Cu: 0.01% or more and 0.10% or less, Sn: 0.01% or more and 0.20% or less, and a remainder including Fe and impurities, in which the hot-rolled steel sheet has a Cu concentration peak value of 0.12% or more in a range from a surface thereof to a depth of 10 μm.
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Patent Agency Ranking
公开(公告)号：US12215401B2
公开(公告)日：2025-02-04
申请号：US17422048
申请日：2020-01-16
Applicant: NIPPON STEEL CORPORATION
Inventor： Shinsuke Takatani , Yoshihiro Arita , Shunsuke Okumura , Shohji Nagano
IPC: C22C38/00 , C21D8/02 , C21D8/12 , C21D9/46 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/16 , C22C38/60
Abstract: A grain-oriented electrical steel sheet of the present invention has a base steel sheet, an amorphous oxide layer formed on the base steel sheet, and a tension-insulation coating formed on the amorphous oxide layer, in which the base steel sheet contains, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80 to 7.00%, Mn: 1.50% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0 to 0.80%, N: 0 to 0.012%, P: 0 to 0.50%, Ni: 0 to 1.00%, Sn: 0 to 0.30%, and Sb: 0 to 0.30%, a remainder is Fe and an impurity, a surface glossiness Gs20(A) in a direction parallel to a rolling direction is 2.0 to 70, and a surface glossiness Gs20(B) in a direction perpendicular to the rolling direction is 2.0 to 70.
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公开(公告)号：US12065713B2
公开(公告)日：2024-08-20
申请号：US17761055
申请日：2020-09-17
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato Yasuda , Takeo Aramaki , Shinya Yano , Yoshihiro Arita , Takashi Kataoka , Kenichi Murakami
IPC: H01F1/147 , C21D6/00 , C21D8/00 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/34
CPC classification number: C21D9/46 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/005 , C21D8/1222 , C21D8/1233 , C21D8/1283 , C22C38/001 , C22C38/002 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/34 , H01F1/147 , C22C2202/02
Abstract: A grain-oriented electrical steel sheet comprises a base steel sheet and a glass coating that is formed on the surface of the base steel sheet, and is characterized in that: the base steel sheet contains as chemical components, in mass %, 0.010% or less of C, from 2.00% to 4.00% of Si, from 0.05% to 1.00% of Mn, from 0.010% to 0.065% of Al, 0.004% or less of N and 0.010% or less of S, with the balance of Fe and impurities, wherein the oxygen concentration in the glass coating and the base steel sheet is 2,500 ppm or less; and if IAl_1 is the first peak intensity of Al and IAl_2 is the second peak intensity of Al in the concentration profile of Al, the relationship of mathematical formula (1) IAl_1
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公开(公告)号：US12060630B2
公开(公告)日：2024-08-13
申请号：US17422471
申请日：2020-01-16
Applicant: NIPPON STEEL CORPORATION
Inventor： Shinsuke Takatani , Yoshihiro Arita , Shunsuke Okumura , Shohji Nagano
CPC classification number: C22C38/54 , C21D8/0205 , C21D8/0226 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C21D2201/05
Abstract: This grain-oriented electrical steel sheet does not have a forsterite film present between a base steel sheet and a tension-insulation coating, in which the base steel sheet contains a predetermined element in a predetermined amount, and in a case in which a cross section perpendicular to a rolling direction of the base steel sheet is viewed, when a region having a length of 10 μm from a surface of the base steel sheet toward the inside of the base steel sheet in a sheet thickness direction of the base steel sheet and a length of 20 mm in a direction perpendicular to the sheet thickness direction is an observation region, needle-like inclusions having a length of 1 μm or more are not present in the observation region.
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公开(公告)号：US12126220B2
公开(公告)日：2024-10-22
申请号：US17642906
申请日：2020-10-06
Applicant: NIPPON STEEL CORPORATION
Inventor： Shin Suenaga , Yoshihiro Arita , Yoshifumi Ohata , Takashi Aramaki , Shuji Yamamoto
CPC classification number: H02K1/276 , H02K1/02 , H02K15/03 , H02K15/12 , H02K2213/03 , Y10T29/49009
Abstract: A rotor is a magnet-embedded rotor incorporated in a traveling motor of a vehicle, and includes: a laminated core having steel sheets laminated to each other and a bonding layer for bonding the steel sheets adjacent to each other in a laminating direction; and a magnet embedded in the laminated core. When the rotor rotates at 11000 rpm, a maximum amount of displacement of an outer edge of the laminated core of the rotor in a radial direction is 0.1 mm or less.
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公开(公告)号：US11952646B2
公开(公告)日：2024-04-09
申请号：US17422219
申请日：2020-01-16
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato Yasuda , Yoshihiro Arita , Masaru Takahashi , Yoshiyuki Ushigami , Shohji Nagano
CPC classification number: C22C38/06 , C21D8/0205 , C21D8/0236 , C21D8/0257 , C21D8/0284 , C22C38/001 , C22C38/02 , C22C38/04 , B82Y30/00 , C21D2201/05
Abstract: Provided is a grain-oriented electrical steel sheet including a base steel sheet, an intermediate layer which is disposed in contact with the base steel sheet and mainly includes silicon oxide, and an insulation coating which is disposed in contact with the intermediate layer and mainly includes phosphate and colloidal silica, in which the base steel sheet contains predetermined chemical composition, BN having an average particle size of 50 to 300 nm is present, when an emission intensity of B is measured using glow discharge emission analysis, predetermined conditions are satisfied, and a ratio of a major axis to a minor axis of BN is 1.5 or less.
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