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1.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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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：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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Patent Agency Ranking
公开(公告)号：US20250101561A1
公开(公告)日：2025-03-27
申请号：US18729888
申请日：2023-02-17
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi IMAMURA , Makoto WATANABE , Masanari TOMOZAWA , Hiroi YAMAGUCHI , Shigehiro TAKAJO , Mari TAKAHASHI
IPC: C22C38/60 , C21D1/74 , C21D6/00 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , H01F1/147
Abstract: Provided is a grain-oriented electrical steel sheet with good film adhesion. Among the elements present at grain boundaries between ceramic particles contained in a base film of the grain-oriented electrical steel sheet, either or both of S and Se elements are contained in a range of 0.02 at % to 2.00 at %.
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7.发明申请公开(公告)号：US20190333662A1
公开(公告)日：2019-10-31
申请号：US16474646
申请日：2017-11-17
Applicant: JFE STEEL CORPORATION
Inventor： Takashi TERASHIMA , Makoto WATANABE , Toshito TAKAMIYA , Tomoyuki OKUBO
Abstract: A grain-oriented electrical steel sheet having an insulating film disposed on a surface thereon. The insulating film having a chemical composition comprising Si, P, O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, Mn, and Co. The insulating film has a crystallinity in a range of 20% or more, and a minimum tension provided to the steel sheet by the insulating film at a temperature in a range of 100° C. to 200° C. is 10 MPa or more.
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公开(公告)号：US20190292623A1
公开(公告)日：2019-09-26
申请号：US16432274
申请日：2019-06-05
Applicant: JFE STEEL CORPORATION
Inventor： Masayasu NAGOSHI , Tomohiro MATSUSHIMA , Makoto WATANABE , Shigehiro TAKAJO , Toshito TAKAMIYA , Masanori UESAKA , Takashi TERASHIMA
IPC: C21D9/46 , C22C38/02 , C21D8/12 , H01F27/245 , H02K1/02 , H02K1/06 , H01F1/18 , H01F1/16 , G01N21/62 , G01N23/225 , G01N23/2251
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：US20180371620A1
公开(公告)日：2018-12-27
申请号：US16117369
申请日：2018-08-30
Applicant: JFE STEEL CORPORATION
Inventor： Takashi TERASHIMA , Makoto WATANABE , Masanori UESAKA , Ryuichi SUEHIRO , Toshito TAKAMIYA
IPC: C23C22/12 , C21D6/00 , C21D9/46 , C23C22/22 , H01F1/18 , C23C22/74 , C23C22/18 , C21D8/12 , C23C22/78 , C23C22/20
Abstract: Provided is a treatment solution for chromium-free tension coating that can simultaneously achieve excellent moisture absorption resistance and a high iron loss reduction effect obtained by imparting sufficient tension, by using an inexpensive Ti source instead of expensive Ti chelate. The treatment solution for chromium-free tension coating contains: one or more of phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in an amount of 50 parts by mass to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of SiO2; Ti source in an amount of 30 parts by mass to 50 parts by mass per 100 parts by mass of the phosphate in terms of solid content of TiO2; and H3PO4, and the number of moles of metallic elements in the phosphate and of phosphorus in the treatment solution satisfy: 0.20≤([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P]≤0.45 (1).
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公开(公告)号：US20180230565A1
公开(公告)日：2018-08-16
申请号：US15750264
申请日：2016-09-21
Applicant: JFE STEEL CORPORATION
Inventor： Makoto WATANABE , Toshito TAKAMIYA , Ryuichi SUEHIRO , Takashi TERASHIMA
CPC classification number: C21D8/1283 , C21D8/1288 , C21D9/46 , C23C22/00 , C23C22/33 , H01F1/16 , H01F1/18
Abstract: A grain-oriented electrical steel sheet has a coating on a surface thereof. The coating has a composite elastic modulus of 60 GPa to 95 GPa and a film thickness of 1.0 μm or more, and a tension applied to the grain-oriented electrical steel sheet by the coating is 6.0 MPa or more, and an amount of iron loss degradation between before and after roll reduction when the grain-oriented electrical steel sheet is roll-reduced at a linear pressure of 68.6 N/cm is 0.010 W/kg or less in W17/50.
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