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公开(公告)号：US20220081744A1
公开(公告)日：2022-03-17
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
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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2.发明公开公开(公告)号：US20230392225A1
公开(公告)日：2023-12-07
申请号：US18269435
申请日：2022-03-31
Applicant: NIPPON STEEL CORPORATION
Inventor： Nobusato MORISHIGE , Takeru ICHIE , Masato YASUDA , Masahide URAGO , Fuminobu MURAKAMI , Daichi HAMADA , Atsushi SHIBAYAMA , Kazumi MIZUKAMI , Daisuke ITABASHI
CPC classification number: C21D8/1222 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/002 , C21D8/1233 , C21D8/1272 , C21D8/1277 , C21D9/46
Abstract: There is provided a non-oriented electrical steel sheet in which, in a cross section of a base material in a sheet thickness direction, the number density N2-5 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range of 2.0 to 5.0 μm from the surface of the base material in the sheet thickness direction is 0.30 pieces/μm2 or less, and the relationship between the number density N2-5 and the number density N0-2 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range from the surface of the base material to 2.0 μm satisfies Formula (1):
(N2-5)/(N0-2)≤0.5 Formula (1).-
公开(公告)号：US20220340991A1
公开(公告)日：2022-10-27
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: C21D9/46 , C22C38/34 , C22C38/16 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , H01F1/147
Abstract: [Problem] To provide a grain-oriented electrical steel sheet which is further improved in terms of iron loss before magnetic domain control, while achieving a sufficient iron loss improvement effect even in the control of a heat-resistant magnetic domain where a sufficient iron loss improvement effect has not been achieved. [Solution] A grain-oriented electrical steel sheet according to one aspect of the present invention comprises abase 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 being made up of Fe and impurities; 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) is satisfied. IAl_1
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Patent Agency Ranking
公开(公告)号：US20250154631A1
公开(公告)日：2025-05-15
申请号：US18838639
申请日：2023-04-04
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato YASUDA , Hideyuki HAMAMURA , Nobusato MORISHIGE , Masaru TAKAHASHI , Kimihiko SUGIYAMA
Abstract: The present invention has as its object to provide grain-oriented electrical steel sheet better improved in core loss in control of magnetic domains for forming laser grooves in cold rolled steel sheet. The present invention provides grain-oriented electrical steel sheet meeting the following requirements for achieving the object:
That is, it provides grain-oriented electrical steel sheet comprising a base material steel sheet having a plurality of grooves on its surface and a glass coating on the surface of the base material steel sheet, in which grain-oriented electrical steel sheet, an absolute value of an angle θ formed by a direction perpendicular to a rolling direction and a sheet thickness direction of the base material steel sheet and a longitudinal direction of the grooves is 0 to 40°, a width W of the grooves is 20 μm to 300 μm, a depth D of the grooves is 10 μm to 40 μm, and a pitch P of the grooves in the rolling direction is 1.0 mm to 30.0 mm, and, at an inside of the glass coating directly under surfaces of the recessed parts of the grooves, one or more fine grains of a long axis of 1 μm or more and 20 μm or less are present in a cross-section perpendicular to the longitudinal direction of the grooves.-
公开(公告)号：US20220341009A1
公开(公告)日：2022-10-27
申请号：US17761043
申请日：2020-09-17
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato YASUDA , Yoshihiro ARITA , Takashi KATAOKA , Kenichi MURAKAMI , Takeo ARAMAKI , Shinya YANO
Abstract: The purpose of the present invention is to provide a method for manufacturing a grain-oriented electrical steel sheet, whereby it becomes possible to manufacture a grain-oriented electrical steel sheet having further improved iron loss properties stably. (Solution) According to one aspect of the present invention, a method for manufacturing a grain-oriented electrical steel sheet is provided, the method being characterized by comprising a re-heating step, a hot rolling step, a hot-rolled sheet annealing step, a cold rolling step, a decarburization annealing step and a final annealing step, wherein the decarburization annealing step includes a heating step of heating a cold-rolled sheet from an inlet side temperature T0° C. to a soaking temperature T2° C. and a soaking step of keeping the temperature of the cold-rolled sheet at the soaking temperature T2° C., and the heating rate HR1 from the time point when the temperature of the cold-rolled sheet is an inlet side temperature T0° C. to the time point when the temperature of the cold-rolled sheet reaches a attained temperature T1° C. is 40° C./sec or more and the heating rate HR2 from the time point when the temperature of the cold-rolled sheet is the desired temperature T1° C. to the time point when the temperature of the cold-rolled sheet reaches the soaking temperature T2° C. is more than 15° C./sec to 30° C./sec in the heating in the decarburization annealing step.
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公开(公告)号：US20210027922A1
公开(公告)日：2021-01-28
申请号：US16962798
申请日：2019-01-24
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato YASUDA , Masaru TAKAHASHI , Yoshiyuki USHIGAMI , Shinya YANO
Abstract: A grain oriented electrical steel sheet includes: a base steel sheet; a lower layer which is arranged in contact with the base steel sheet; and an insulation coating which is arranged in contact with the lower layer and which includes a phosphate and a colloidal silica as main components. The base steel sheet includes the predetermined chemical composition and includes a B compound whose major axis length is 1 to 20 μm and whose number density is 1×10 to 1×106 pieces/mm3. The lower layer is a glass film which includes a forsterite as main component or an intermediate layer includes a silicon oxide as main component.
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公开(公告)号：US20250157708A1
公开(公告)日：2025-05-15
申请号：US18838920
申请日：2023-04-04
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato YASUDA , Hideyuki HAMAMURA , Nobusato MORISHIGE , Shinji YAMAMOTO , Kimihiko SUGIYAMA
IPC: H01F1/18 , B23K26/364 , C21D6/00 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06
Abstract: The present invention has as its object to provide grain-oriented electrical steel sheet better improved in core loss in control of magnetic domains for forming laser grooves in cold rolled steel sheet. The present invention provides grain-oriented electrical steel sheet meeting the following requirements for achieving the object:
That is, it provides grain-oriented electrical steel sheet comprising a base material steel sheet having a plurality of grooves on the surface of the steel sheet and a glass coating on the surface of the base material steel sheet, in which grain-oriented electrical steel sheet, an absolute value of an angle θ formed by a direction perpendicular to a rolling direction and a sheet thickness direction of the base material steel sheet and a longitudinal direction of the grooves is 0 to 40°, a width W of the grooves is 20 μm to 300 μm, a depth D of the grooves is 10 μm to 40 μm, and a pitch P of the grooves in the rolling direction is 1.0 mm to 30 mm, and, when a thickness of the glass coating at flat parts of the surface of the base material steel sheet is t1, a glass coating thickness of deepest parts of the grooves in the recessed parts of the grooves is t2, and a glass coating thickness of side parts of the grooves is t3, the relationship of formula (1) is satisfied: (t2+t3)/2≥t1 formula (1)-
公开(公告)号：US20220098691A1
公开(公告)日：2022-03-31
申请号：US17421824
申请日：2020-01-16
Applicant: NIPPON STEEL CORPORATION
Inventor： Masato YASUDA , Masaru TAKAHASHI , Yoshiyuki USHIGAMI , Shohji NAGANO , Yoichi ZAIZEN
IPC: C21D9/46 , C21D8/12 , C21D6/00 , C21D3/04 , C22C38/34 , C22C38/16 , C22C38/60 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , H01F1/147
Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: heating a steel slab having a prescribed chemical composition to lower than 1250° C. and subjecting the steel slab to hot rolling to obtain a hot-rolled steel sheet; performing hot-band annealing on the hot-rolled steel sheet; pickling the hot-rolled steel sheet which has been subjected to the hot-band annealing; subjecting the hot-rolled steel sheet which has been subjected to the pickling to cold rolling to obtain a cold-rolled steel sheet having a final sheet thickness d of 0.15 to 0.23 mm; performing a decarburization nitriding treatment including decarburization annealing and nitriding on the cold-rolled steel sheet; performing final annealing on the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment; and then applying a coating liquid for insulation coating formation to the cold-rolled steel sheet which has been subjected to the final annealing and baking the cold-rolled steel sheet. Sol. Al/N which is a mass ratio between Sol. Al and N in the steel slab and the final sheet thickness d satisfy a prescribed relational expression, the N content of the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment is 40 to 1000 ppm, and a decarburization annealing temperature in the decarburization annealing is lower than 1000° C.
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