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公开(公告)号：US11335475B2
公开(公告)日：2022-05-17
申请号：US16065318
申请日：2016-12-22
申请人： POSCO
发明人： Min Serk Kwon , Hyun Seok Ko
摘要： An insulation film composition for a grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 10-50 parts by weight of metal silicate or organic silicate, 20-70 parts by weight of inorganic nanoparticles and 0.1-20 parts by weight of cobalt hydroxide. The insulation film composition can further include 10-50 parts by weight of metal phosphate, and/or 5-30 parts by weight of inorganic nanoparticles having a particle diameter of 1 nm to less than 10 nm, and/or inorganic nanoparticles having a particle diameter of 10 to 100 nm and/or 0.1-20 parts by weight of chromium oxide.
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公开(公告)号：US11326221B2
公开(公告)日：2022-05-10
申请号：US16471288
申请日：2017-12-13
申请人： POSCO
发明人： Dae Hyun Song , Seung Il Kim , June Soo Park , Il Nam Yang
IPC分类号： C21D9/46 , C21D6/00 , C21D8/00 , C21D8/12 , C22C38/00 , C22C38/04 , C22C38/06 , C22C38/34 , C22C38/40 , H01F1/147
摘要： According to an exemplary embodiment of the present invention, a manufacturing method of a grain-oriented electrical steel sheet, includes: preparing a slab; heating the slab; forming a hot-rolled sheet by hot-rolling the slab; performing hot-rolled sheet annealing on the hot-rolled sheet; forming a cold-rolled sheet by cold-rolling the hot-rolled sheet that has been completely subjected to the hot-rolled sheet annealing; performing first recrystallization annealing on the cold-rolled sheet; and performing second recrystallization annealing on the cold-rolled sheet that has been completely subjected to the first recrystallization annealing, wherein the hot-rolled sheet undergoes a first heating step, a second heating step, and a soaking step, and a temperature rise rate t1 of the first heating step and a temperature rise rate t2 of the second heating step satisfy Formula 1. 5×t2≤t1 [Formula 1]
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公开(公告)号：US20220119910A1
公开(公告)日：2022-04-21
申请号：US17550366
申请日：2021-12-14
申请人： POSCO
发明人： Min Serk Kwon , Tae Young No , Chang Soo Park , Heon-Jo Choi
IPC分类号： C21D9/46 , C04B35/465 , C21D3/04 , C21D6/00 , C21D8/02 , C21D8/12 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/60 , C21D1/68
摘要： Provided is an annealing separating agent composition for a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet and a method for manufacturing a grain-oriented electrical steel sheet. The annealing separating agent composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention contains 30 to 70% by weight of a calcium compound, and the remainder of magnesium oxide or magnesium hydroxide on a solid basis.
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公开(公告)号：US20220119904A1
公开(公告)日：2022-04-21
申请号：US17421232
申请日：2020-01-08
发明人： Ryutaro YAMAGATA , Ichiro TANAKA
摘要： Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of the primary coating to the steel sheet is provided. The grain-oriented electrical steel sheet according to the present invention is provided with a base metal steel sheet containing a chemical composition containing, by mass %, C: 0.005% or less, Si: 0.5 to 7.0%, Mn: 0.05 to 1.00%, a total of S and Se: 0.005% or less, sol. Al: 0.005% or less, and N: 0.005% or less and having a balance comprised of Fe and impurities and with a primary coating formed on a surface of the base metal steel sheet and containing Mg2SiO4as a main constituent, wherein a peak position of Al emission intensity obtained when performing elemental analysis by glow discharge optical emission spectrometry from a surface of the primary coating in a thickness direction of the grain-oriented electrical steel sheet is arranged within a range of 2.0 to 12.0 μm from the surface of the primary coating in the thickness direction, and a number density of Al oxides of a size of 0.1 μm or more in terms of a circle equivalent diameter based on the area at the peak position of Al emission intensity is 0.03 to 0.2/μm2.
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公开(公告)号：US11299791B2
公开(公告)日：2022-04-12
申请号：US16061183
申请日：2016-12-09
申请人： POSCO
发明人： Hun Ju Lee , Yong Soo Kim , Su Yong Sin
IPC分类号： C21D9/46 , C21D8/12 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/00 , C22C38/60 , H01F1/147
摘要： A non-oriented electric steel sheet includes 2.5 wt % to 3.1 wt % of Si, 0.1 wt % to 1.3 wt % of Al, 0.2 wt % to 1.5 wt % of Mn, 0.008 wt % or less of C (excluding 0 wt %), 0.005 wt % or less of S (excluding 0 wt %), 0.005 wt % or less of N (excluding 0 wt %), 0.005 wt % or less of Ti (excluding 0 wt %), 0.001 wt % to 0.07 wt % of Mo, 0.001 wt % to 0.07 wt % of P, 0.001 wt % to 0.07 wt % of Sn, and 0.001 wt % to 0.07 wt % of Sb, in which a remainder includes Fe and inevitable impurities, an average crystal grain diameter is 70 μm to 150 μm, the non-oriented electric steel sheet satisfies Equations (1) and (2), 0.32≤([Al]+[Mn])/[Si]≤0.5 [Equation 1] 0.025≤[Mo]+[P]+[Sn]+[Sb]≤0.15 [Equation 2] (here, a bracket denotes the contents (wt %) of each element).
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公开(公告)号：US20220106657A1
公开(公告)日：2022-04-07
申请号：US17554245
申请日：2021-12-17
申请人： POSCO
发明人： Kyu-Seok HAN , Hyun-Seok KO
摘要： A method for manufacturing an oriented electrical steel sheet according to an exemplary embodiment of the present invention includes: providing a slab including, as wt %, Si at equal to or less than 4.0% (excluding 0%), C at 0.001% to 0.4%, and Mn at 0.001% to 2.0%, and including a balance including Fe and inevitably mixed and input impurities; reheating the slab; manufacturing a hot steel sheet by hot-rolling the slab; performing hot-rolled steel sheet annealing to the hot steel sheet; primarily cold-rolling the hot-rolled steel sheet annealed hot steel sheet; decarburization-annealing the cold-rolled steel sheet; secondarily cold-rolling the decarburization-annealed steel sheet;
and finally annealing the cold-rolled steel sheet, wherein, regarding the finally annealed steel sheet, a size 2L of a magnetic domain existing in a grain is less than a thickness D of the steel sheet (2L-
公开(公告)号：US11293070B2
公开(公告)日：2022-04-05
申请号：US16483829
申请日：2018-01-17
摘要： In a grain-oriented electrical steel sheet, comprising magnetic domains refined by a plurality of linear grooves in a surface of a steel sheet, each of the linear grooves is provided on its floor with a plurality of recessed parts aligned in a direction in which the linear groove extends, at a predetermined interval p (μm), and the recessed part is made to have a predetermined depth d (μm). In this way, it is possible to provide a grain-oriented electrical steel sheet having further improved iron loss properties while having reduced magnetic flux density reduction.
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公开(公告)号：US20220102035A1
公开(公告)日：2022-03-31
申请号：US17422011
申请日：2020-01-16
摘要： A grain-oriented electrical steel sheet according to an aspect of the present invention includes an underlying steel sheet and a tension-insulation coating arranged on the surface of the underlying steel sheet, and a ten-point average roughness RzL in an L direction obtained when the tension-insulation coating is removed from the grain-oriented electrical steel sheet with an alkaline solution, and then the surface of the underlying steel sheet is measured in a rolling direction is 6.0 μm or less.
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公开(公告)号：US20220098697A1
公开(公告)日：2022-03-31
申请号：US17426729
申请日：2020-01-30
发明人： Takeshi IMAMURA , Makoto WATANABE
IPC分类号： C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/42 , C22C38/48 , C22C38/60 , C21D8/12
摘要： Provided are a grain-oriented electrical steel sheet having excellent iron loss property without using magnetic domain refining treatment and an iron core produced using the same. The steel sheet comprises: a predetermined chemical composition; and a steel microstructure in which: crystal grains are made up of coarse secondary recrystallized grains of 5.0 mm or more, fine grains of more than 2.0 mm and less than 5.0 mm contained at a frequency of 0.2 to 5 grains per cm2, and very fine grains of 2.0 mm or less; for each coarse secondary recrystallized grain extending through the sheet in a thickness direction, an area ratio of a region in which projected surfaces of exposed areas of the coarse secondary recrystallized grain on a front side and a back side of the sheet coincide with each other to each of the exposed areas is 95% or more.
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公开(公告)号：US20220090226A1
公开(公告)日：2022-03-24
申请号：US17421766
申请日：2020-01-16
发明人： Takeshi IMAI , Shunsuke OKUMURA
IPC分类号： C21D9/46 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , C21D3/04 , C21D1/26 , H01F1/147
摘要： A method for producing a grain-oriented electrical steel sheet which has an intermediate layer containing silicon oxide as a main component on a surface of a base steel sheet in which a forsterite film is substantially absent and has an insulation coating on a surface of the intermediate layer includes: a decarburization annealing process of obtaining a decarburization-annealed steel sheet which has the oxygen content or 320 ppm or less and the carbon content of 25 ppm or less by subjecting a cold rolled steel sheet containing Si to decarburization annealing; a final annealing process of heating the decarburization-annealed steel sheet in a state in which a surface of the decarburization-annealed steel sheet is coated with an annealing separator to subject a steel sheet to secondary recrystallization; a removal process of obtaining a finally-annealed steel sheet by removing the annealing separator on the steel sheet which has been subjected to the final annealing process; an intermediate layer forming process of forming the intermediate layer by subjecting the finally-annealed steel sheet to thermal oxidation annealing; and an insulation coating forming process of forming the insulation coating on the finally-annealed steel sheet having the intermediate layer formed thereon.
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