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公开(公告)号：US20220195570A1
公开(公告)日：2022-06-23
申请号：US17594382
申请日：2020-04-13
发明人： Yukino MIYAMOTO , Yoshiaki ZAIZEN , Yoshihiko ODA
摘要： A non-oriented electrical steel sheet having: low high-frequency iron loss and high magnetic flux density; an inner layer and surface layers provided on both sides of the inner layer, the surface layers and the inner layer having specific chemical compositions; the thickness t of 0.01 mm to 0.35 mm; a multilayer ratio of ti to t of 0.10 to 0.70, t1 denoting a total thickness of the surface layers; a difference between [Si]1 and [Si]0 of 1.0 mass % to 4.5 mass % or less, [Si]1 denoting a Si content in each of the surface layers and [Si]0 denoting a Si content in the inner layer; and a difference between [Mn]0 and [Mn]1 of 0.01 mass % to 0.40 mass %, [Mn]0 denoting a Mn content at a mid-thickness position t/2 and [Mn]1 denoting an average Mn content in a region from a surface to a position at a depth of ( 1/10)t.
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公开(公告)号：US20230127911A1
公开(公告)日：2023-04-27
申请号：US17907670
申请日：2021-02-16
摘要： Provided is a laser machining method that causes no degradation in magnetic properties for thin electrical steel sheets. An electrical steel sheet machining method comprises machining an electrical steel sheet to a predetermined shape by melt-cutting the electrical steel sheet using a laser, wherein a scanning rate of the laser in the melt-cutting is 10000 mm/min or more.
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公开(公告)号：US20220290287A1
公开(公告)日：2022-09-15
申请号：US17754146
申请日：2020-09-17
发明人： Yukino MIYAMOTO , Yoshiaki ZAIZEN , Yoshihiko ODA
IPC分类号： C23C10/08 , C22C38/60 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C23C10/60 , C21D9/46 , C21D6/00 , H01F1/147
摘要： Disclosed is a non-oriented electrical steel sheet having low iron loss in a frequency range of about 400 Hz. The non-oriented electrical steel sheet comprises an inner layer and surface layers, wherein the inner layer and surface layers have specific chemical compositions, each of the surface layers has an in-plane tensile stress of 5 MPa to 50 MPa, the non-oriented electrical steel sheet has a sheet thickness t of 0.01 mm to 0.35 mm, the surface layers have a total thickness t1 with a ratio t1/t of the total thickness t1 to the sheet thickness t being 0.10 to 0.70, the non-oriented electrical steel sheet has an average N content [N] in the total sheet thickness of 40 ppm or less, and an iron loss W10/400 and the sheet thickness t satisfy the following formula (1): W10/400≤8+30t (1).
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公开(公告)号：US20210371948A1
公开(公告)日：2021-12-02
申请号：US17281617
申请日：2019-07-16
IPC分类号： C21D9/46 , B32B15/01 , C21D8/12 , C21D6/00 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/60 , H01F1/147
摘要： A non-oriented electrical steel sheet with an average magnetostriction λp-p at 400 Hz and 1.0 T of not more than 4.5×10−6, and area ratio of recrystallized grains at a section in rolling direction of steel sheet of 40 to 95% and an average grain size of 10 to 40 μm is obtained by subjecting a steel slab containing, in mass %, C: not more than 0.005%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Al: not more than 3.0%, P: not more than 0.20%, S: not more than 0.005%, N: not more than 0.005%, Ti: not more than 0.003%, V: not more than 0.005% and Nb: not more than 0.005% and satisfying Si-2Al-Mn≥0 to hot rolling, hot-band annealing, cold rolling and finish annealing under adequate cold rolling and finish annealing conditions, and a motor core is manufactured by such a steel sheet.
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公开(公告)号：US20220243298A1
公开(公告)日：2022-08-04
申请号：US17630506
申请日：2020-04-28
IPC分类号： C21D9/46 , C22C38/18 , C22C38/16 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/34 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , C23C10/08 , H01F1/147
摘要： Provided is a non-oriented electrical steel sheet having excellent adhesion with an insulating coating even if the thickness of the insulating coating is reduced. The non-oriented electrical steel sheet of the present disclosure has an insulating coating on at least one surface of the steel sheet, where the insulating coating has a P-concentrated layer on both a surface side and an interface side with a steel substrate, and a P concentration of the P-concentrated layer is higher than a P concentration in the steel substrate.
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公开(公告)号：US20210388456A1
公开(公告)日：2021-12-16
申请号：US17281614
申请日：2019-07-04
IPC分类号： C21D9/46 , C21D8/12 , C21D6/00 , C22C38/60 , C22C38/50 , C22C38/48 , C22C38/42 , C22C38/34 , C22C38/28 , C22C38/26 , C22C38/20 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , H01F1/147
摘要： A non-oriented electrical steel sheet is produced by subjecting a steel slab containing, in mass %, C: not more than 0.0050%, Si: 1.0 to 6.5%, Mn: 0.05 to 2.0%, S: not more than 0.0050%, Al: not more than 0.01%, N: not more than 0.0050%, Ti: not more than 0.0030%, Nb: not more than 0.0030% and O: not more than 0.0050% to a hot rolling, a cold rolling and a finish annealing, the finish annealing conducted under conditions that a soaking temperature T (° C.) satisfies the following equation (1): ( 8 0 0 0 + 400 × Si ( mass % ) ) { ( - log ( Al ( mass % ) × N ( mass % ) ) + 1.7 + 0.2 × Si ( mass % ) } - 2 7 3 . 1 5 ≤ T ≤ 1200 , ( 1 ) and an atmosphere in the finish annealing is a mixed gas composed of one or more selected from nitrogen, hydrogen and noble gas with a nitrogen content of not more than 50 vol % and a dew point of not higher than −20° C., whereby a non-oriented electrical steel sheet achieving a high magnetic flux density and a low iron loss is produced.
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公开(公告)号：US20230065674A1
公开(公告)日：2023-03-02
申请号：US17977178
申请日：2022-10-31
IPC分类号： C21D9/46 , B32B15/01 , C21D6/00 , C21D8/12 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/60 , H01F1/147
摘要： A non-oriented electrical steel sheet with an average magnetostriction λp-p at 400 Hz and 1.0 T of not more than 4.5×10−6, and area ratio of recrystallized grains at a section in rolling direction of steel sheet of 40 to 95% and an average grain size of 10 to 40 μm is obtained by subjecting a steel slab containing, in mass %, C: not more than 0.005%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Al: not more than 3.0%, P: not more than 0.20%, S: not more than 0.005%, N: not more than 0.005%, Ti: not more than 0.003%, V: not more than 0.005% and Nb: not more than 0.005% and satisfying Si-2Al-Mn≥0 to hot rolling, hot-band annealing, cold rolling and finish annealing under adequate cold rolling and finish annealing conditions, and a motor core is manufactured by such a steel sheet.
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公开(公告)号：US20220375667A1
公开(公告)日：2022-11-24
申请号：US17755318
申请日：2020-05-13
摘要： Provides is a non-oriented electrical steel sheet suitable for use in a rotor of an IPM motor that has excellent magnetic flux density B50 and high-frequency iron loss properties, high tensile strength and fatigue strength, and little variation in tensile strength. The non-oriented electrical steel sheet has a predetermined steel sheet chemical composition and a microstructure in which a ratio of non-recrystallized microstructure is 5% or more and 70% or less and the number of inclusion having a diameter of 5 μm or more is not more than 5 counts/mm2.
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公开(公告)号：US20220239202A1
公开(公告)日：2022-07-28
申请号：US17611781
申请日：2020-05-15
摘要： A method for manufacturing a motor core includes a step of manufacturing a motor core by performing melt-cutting on an electrical steel sheet using heat input from a surface, the electrical steel sheet having an average thermal conductivity in depth positions from the surface to one-third depth of a sheet thickness lower than a thermal conductivity in a middle position in a sheet thickness direction by 30% or greater.
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