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公开(公告)号：EP3725906A1
公开(公告)日：2020-10-21
申请号：EP18888022.3
申请日：2018-12-10
IPC分类号： C22C38/00 , C21D8/12 , C22C38/14 , C22C38/60 , H01F1/147 , B23K20/227 , B32B7/02 , B32B7/025 , B32B15/01 , C22C38/02 , B23K20/04
摘要： Provided is a multilayer electrical steel sheet having low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and inner layer have predetermined chemical compositions, the multilayer electrical steel sheet having: ΔSi of 0.5 mass% or more, ΔSi being defined as a difference between a Si content in the surface layer [Si] 1 and a Si content in the inner layer [Si] 0 represented by [Si] 1 -[Si] 0 ; Δλ 1.0/400 of 1.0 × 10 -6 or less, Δλ 1.0/400 being defined as an absolute value of the difference between a magnetostriction of the surface layer λ 1.0/400,1 and a magnetostriction of the inner layer λ 1.0/400,0 ; a sheet thickness t of 0.03 mm to 0.3 mm, and a ratio of a total thickness of the surface layers t 1 to t of from 0.10 to 0.70.
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公开(公告)号：EP3725905A1
公开(公告)日：2020-10-21
申请号：EP18887312.9
申请日：2018-12-10
IPC分类号： C22C38/00 , C22C38/06 , C22C38/60 , H01F1/147 , C21D8/12 , B32B15/01 , C22C38/02 , C22C38/12
摘要： Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which each of the surface layers has a Si content of 2.5 mass% to 6.0 mass%, the inner layer has a Si content of 1.5 mass% to 5.0 mass%, and the multilayer electrical steel sheet has: ΔSi of 0.5 mass% or more, ΔSi being defined as a difference in Si content between the surface layers and the inner layer; ΔAl of 0.05 mass% or less, ΔAl being defined as an absolute value of a difference in Al content between the surface layers and the inner layer; Δλ 1.0/400 of 1.0 × 10 -6 or less, Δλ 1.0/400 being defined as an absolute value of a difference in magnetostriction between the surface layers and the inner layer; a sheet thickness t of 0.03 mm to 0.3 mm; and a ratio of a total thickness of the surface layers t 1 to t of from 0.10 to 0.70.
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公开(公告)号：EP3438314A1
公开(公告)日：2019-02-06
申请号：EP17775283.9
申请日：2017-03-29
摘要： Provided are an electrical steel sheet having a high saturation magnetic flux density and a low iron-loss at high frequencies and a method for producing the electrical steel sheet.
The electrical steel sheet includes, with a symmetry plane being the center of the steel sheet in the thickness direction, a surface part in which the Si concentration in the steel sheet changes continuously from a high Si concentration to a low Si concentration in the thickness direction of the steel sheet from the surface of the steel sheet, a boundary part in which the Si concentration changes discontinuously, and an inner part in which the Si concentration does not change substantially in the thickness direction of the steel sheet, the inner part including the center of the steel sheet in the thickness direction. An in-plane tensile stress is generated in the surface part. An in-plane compressive stress is generated in the inner part. The average aspect ratio of crystal grains included in the surface part, that is, the ratio of the dimension of the crystal grains in a direction parallel to the surface of the steel sheet to the dimension of the crystal grains in a direction (depth direction) perpendicular to the surface of the steel sheet, is 0.7 or more and 4.0 or less.-
公开(公告)号：EP3725907A1
公开(公告)日：2020-10-21
申请号：EP18888348.2
申请日：2018-12-10
IPC分类号： C22C38/00 , C22C38/60 , H01F1/147 , C21D8/12 , B32B15/01 , C22C38/02 , C22C38/06 , C22C38/12
摘要： Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and the inner layer have a predetermined chemical composition, the multilayer electrical steel sheet having: ΔSi of 0.5 mass% to 4.0 mass%, ΔSi being defined as a difference in Si content between the surface layers and the inner layer; ΔAl of 0.05 mass% or less, ΔAl being defined as an absolute value of a difference in Al content between the surface layers and the inner layer; a ratio of t 1 to t represented by t 1 /t of from 0.10 to 0.70, where t 1 denotes a total thickness of the surface layers and t denotes a sheet thickness of the multilayer electric steel sheet; a magnetic flux density at a magnetic field intensity of 1000 A/m represented by B 10 of 1.3 T or more; and a ratio of B 1 to B 10 represented by B 1 /B 10 of 0.45 or more, where B 1 denotes a magnetic flux density at a magnetic field intensity of 100 A/m; and an iron loss at a frequency of 1 kHz and a largest magnetic flux density of 1.0 T represented by W 10/1k in W/kg and the sheet thickness t in mm satisfy the following formula (1): W 10/1k ≤ 15 + 140 × t (1).
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公开(公告)号：EP3533890A1
公开(公告)日：2019-09-04
申请号：EP17863904.3
申请日：2017-08-30
摘要： Iron loss is reduced by increasing magnetic flux density. Disclosed is a non-oriented electrical steel sheet has a chemical composition containing, by mass%, C: 0.0050 % or less, Si: 1.50 % or more and 4.00 % or less, Al: 0.500 % or less, Mn: 0.10 % or more and 5.00 % or less, S: 0.0200 % or less, P: 0.200 % or less, N: 0.0050 % or less, O: 0.0200 % or less, and Ca: 0.0010 % or more and 0.0050 % or less, with the balance being Fe and inevitable impurities, in which the non-oriented electrical steel sheet has an Ar 3 transformation temperature of 700 °C or higher, a grain size of 80 µm or more and 200 µm or less, and a Vickers hardness of 140 HV or more and 230 HV or less.
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