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公开(公告)号：US20220119905A1
公开(公告)日：2022-04-21
申请号：US17421938
申请日：2020-01-16
IPC分类号： C21D9/46 , C21D8/12 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/60 , C23G1/02 , C23C28/04
摘要： A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
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公开(公告)号：US20220090240A1
公开(公告)日：2022-03-24
申请号：US17421774
申请日：2020-01-16
摘要： A method of manufacturing a grain-oriented electrical steel sheet according to the present invention includes a process of executing hot rolling on a slab to obtain a hot-rolled sheet; a process of executing hot-rolled sheet annealing on the hot-rolled sheet to obtain an annealed hot-rolled sheet; a process of executing cold rolling on the annealed hot-rolled sheet to obtain a cold-rolled sheet; a process of executing decarburization annealing on the cold-rolled sheet to obtain a decarburization annealed sheet; a process of applying an annealing separator containing alumina as a main component to the decarburization annealed sheet; and a process of executing final annealing on the decarburization annealed sheet to which the annealing separator is applied, wherein the annealing separator contains 28% to 50% by mass of MgO, and wherein an application amount of the annealing separator is 6.0 to 14.0 g/m2 per one surface of the decarburization annealed sheet.
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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
摘要： 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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公开(公告)号：US20200176156A1
公开(公告)日：2020-06-04
申请号：US16628983
申请日：2018-07-13
摘要： A grain-oriented electrical steel sheet includes: a steel sheet; an oxide layer including SiO2 that is formed on the steel sheet; and a tension-insulation coating that is formed on the oxide layer, in which the steel sheet includes, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80% to 7.00%, Mn: 1.00% 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%, Sb: 0% to 0.30%, and a remainder of Fe and impurities, the tension-insulation coating includes a chromium compound, and the Fe content in the oxide layer and the tension-insulation coating is 70 mg/m2 to 250 mg/m2.
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公开(公告)号：US20220119906A1
公开(公告)日：2022-04-21
申请号：US17422048
申请日：2020-01-16
IPC分类号： C21D9/46 , C21D8/12 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/16 , C22C38/60
摘要： 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：US20220112573A1
公开(公告)日：2022-04-14
申请号：US17421975
申请日：2020-01-16
IPC分类号： C21D9/46 , C22C38/34 , C22C38/32 , C22C38/24 , C22C38/16 , C22C38/14 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/00 , C21D8/12 , C21D8/00 , C21D6/00 , C21D3/04 , H01F1/147
摘要： A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
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公开(公告)号：US20220098691A1
公开(公告)日：2022-03-31
申请号：US17421824
申请日：2020-01-16
IPC分类号： 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
摘要： 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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公开(公告)号：US20220090245A1
公开(公告)日：2022-03-24
申请号：US17422471
申请日：2020-01-16
摘要： 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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