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31.发明公开公开(公告)号：US20240240292A1
公开(公告)日：2024-07-18
申请号：US18263707
申请日：2022-02-02
Applicant: JFE STEEL CORPORATION
Inventor： Makoto WATANABE , Takuya YAMADA , Takashi TERASHIMA
CPC classification number: C22C38/02 , C21D6/008 , C21D8/005 , C21D8/1222 , C21D8/1233 , C21D8/1266 , C21D8/1272 , C21D8/1283 , C21D9/46 , C22C38/04 , C22C38/12 , C22C38/14 , C21D2201/05
Abstract: To provide a method of producing a grain-oriented electrical steel sheet whereby greater purification of an inhibitor-strengthening element can be promoted by improvement of an annealing separator and, as a result, iron loss can be effectively improved. The annealing separator contains 1 to 10 parts by mass of a composite oxide, relative to 100 parts by mass of MgO, the composite oxide containing at least one selected from a Group 1: Fe, Mn, Al and Ca, and at least one of a Group 2: Zr, Ta, Mo and Nb.
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32.发明公开公开(公告)号：US20240043950A1
公开(公告)日：2024-02-08
申请号：US18546970
申请日：2022-03-14
Applicant: JFE STEEL CORPORATION
Inventor： Takashi TERASHIMA , Karin SHIROYANAGI
CPC classification number: C21D8/1283 , C21D9/46 , C21D8/1222 , C21D8/1233 , C21D8/1255 , C21D8/1261 , H01F1/20
Abstract: An annealing separator, by being applied to a steel sheet, enables retention of a good shape of a coil after annealing obtained by winding the steel sheet with the annealing separator applied thereto into a coil which is then annealed at a high temperature exceeding 1000° C. A powder used as the annealing separator: contains magnesium oxide as a main component and B: 0.020 mass % or more and 0.200 mass % or less, SO3: 0.030 mass % or more and 2.000 mass % or less, and P2O3: 0.050 mass % or more and 1.000 mass % or less; and contains 0.2 mass % or more and 5.0 mass % or less of particles having a particle size of more than 45 μm and 75 μm or less. The particles having this particle size contain (boron) B: 0.002 mass % or more and less than 0.020 mass %, SO3: less than 0.030 mass %, and P2O3: less than 0.050 mass %.
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Patent Agency Ranking
公开(公告)号：US20220074030A1
公开(公告)日：2022-03-10
申请号：US17417113
申请日：2019-12-26
Applicant: JFE STEEL CORPORATION
Inventor： Takashi TERASHIMA , Makoto WATANABE , Toshito TAKAMIYA , Karin KOKUFU
Abstract: Provided is an annealing separator with which a grain-oriented electrical steel sheet having a forsterite film with excellent appearance uniformity and adhesion can be obtained. The annealing separator for grain-oriented electrical steel sheet comprises: magnesia that contains 0.05 mass % or more and 0.20 mass % or less of B, a phosphate in 0.1 parts by mass or more and 1.0 part by mass or less in terms of P per 100 parts by mass of the magnesia, and titanium oxide in 1.0 part by mass or more and 10.0 parts by mass or less per 100 parts by mass of the magnesia where the titanium oxide contains one or more types of alkali metals in a total amount of 0.050 mass % or more and 1.0 mass % or less, where an amount of P adsorbed on per 1 g of the titanium oxide is 1.0×10−4 g or less.
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公开(公告)号：US20210269921A1
公开(公告)日：2021-09-02
申请号：US17269183
申请日：2019-06-27
Applicant: JFE STEEL CORPORATION
Inventor： Takashi TERASHIMA , Karin KOKUFU , Makoto WATANABE , Toshito TAKAMIYA
Abstract: A production method for a treatment solution for forming an insulating coating. The method includes mixing a solution A containing, on a PO43− basis, 0.20 mol/L or more and 10 mol/L or less of at least one of (i) phosphoric acid and (ii) a phosphate salt, and containing, on a metal basis, less than 0.50 mol/L of one or more particulate metal compounds, and a solution B containing, on a metal basis, 0.50 mol/L or more and 20.0 mol/L or less of the one or more particulate metal compounds, and containing, on a PO43− basis, less than 0.20 mol/L of at least one of (i) phosphoric acid and (ii) a phosphate salt, and stirring with a turbine stator-type high-speed stirrer such that a peripheral speed of a turbine reaches 10 m/s or more within 60 seconds after starting the mixing of the solution A and the solution B.
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公开(公告)号：US20180037966A1
公开(公告)日：2018-02-08
申请号：US15549578
申请日：2015-02-13
Applicant: JFE STEEL CORPORATION
Inventor： Yasuyuki HAYAKAWA , Kunihiro SENDA , Takashi TERASHIMA
CPC classification number: C21D9/46 , C21D6/005 , C21D6/008 , C21D8/1222 , C21D8/1233 , C21D8/1238 , C21D8/1266 , C21D8/1272 , C21D8/1283 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/34 , C22C38/60 , H01F1/16
Abstract: A grain-oriented electrical steel sheet having a composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, and also containing Sb and P in respective ranges satisfying 0.01%≦[% Sb]≦0.20% and 0.02%≦[% P]≦2.0×[% Sb], with a balance being Fe and incidental impurities, wherein when the steel sheet is excited to 1.0 T at 50 Hz in a rolling transverse direction, a magnetizing force (TD-H10) and an iron loss (TD-W10) are respectively (TD-H10)≧200 A/m and (TD-W10)≧1.60 W/kg. Thus, a grain-oriented electrical steel sheet having excellent transformer core loss can be obtained industrially stably at low cost.
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公开(公告)号：US20170240987A1
公开(公告)日：2017-08-24
申请号：US15514746
申请日：2015-09-11
Applicant: JFE STEEL CORPORATION
Inventor： Masayasu NAGOSHI , Tomohiro MATSUSHIMA , Makoto WATANABE , Shigehiro TAKAJO , Toshito TAKAMIYA , Masanori UESAKA , Takashi TERASHIMA
IPC: C21D9/46 , C21D8/12 , H01F27/245 , G01N21/62 , H02K1/02 , H02K1/06 , G01N23/225 , C22C38/02 , H01F1/18
Abstract: A grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet, wherein a total area percentage of defective parts scattered on the forsterite film is less than 1.5% relative to a surface area of the forsterite film when viewed from above the surface, and methods for evaluating a grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet.
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公开(公告)号：US20170081740A1
公开(公告)日：2017-03-23
申请号：US15311026
申请日：2015-05-11
Applicant: JFE STEEL CORPORATION
Inventor： Ryuichi SUEHIRO , Takashi TERASHIMA , Makoto WATANABE , Toshito TAKAMIYA
IPC: C21D9/46 , C21D3/04 , C22C38/60 , C22C38/34 , C22C38/26 , H01F1/16 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/12 , C22C38/16
CPC classification number: C21D9/46 , C21D3/04 , C21D8/12 , C21D8/1222 , C21D8/1233 , C21D8/1261 , C21D8/1266 , C21D8/1272 , C21D8/1283 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/26 , C22C38/34 , C22C38/60 , H01F1/16 , H01F3/02
Abstract: In a method for producing a grain-oriented electrical steel sheet by subjecting a slab containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.01-0.8 mass % and further containing Al and N, or S and/or Se, or Al, N, S and/or Se as inhibitor ingredients to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within a range of 700-800° C. in a heating process of the decarburization annealing is T1 and a certain temperature as a soaking temperature within a range of 820-900° C. is T2, a heating rate R1 between 500° C. and T1 is set to not less than 80° C./s and a heating rate R2 between T1 and T2 is set to not more than 15° C./s, whereby a grain-oriented electrical steel sheet having excellent magnetic properties and peeling resistance of forsterite coating is obtained while ensuring decarburization property.
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