公开(公告)号：US20210035718A1

公开(公告)日：2021-02-04

申请号：US16967945

申请日：2019-01-21

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Masahiro SUEMUNE ,  Karin KOKUFU ,  Toshito TAKAMIYA

IPC: H01F1/147 ,  C23C28/04

Abstract: An insulating coating-attached electrical steel sheet has, on at least one surface, an insulating coating including an insulating tensile coating layer A. A tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×σA or more, where M is a weight of the insulating tensile coating layer A, and σA is the tension applied to the steel sheet by the insulating tensile coating layer A. The insulating coating-attached electrical steel sheet has excellent adhesion of the insulating coating. A method for manufacturing the insulating coating-attached electrical steel sheet is also provided.

公开(公告)号：US20210317319A1

公开(公告)日：2021-10-14

申请号：US17264129

申请日：2019-06-19

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Karin KOKUFU ,  Makoto WATANABE ,  Toshito TAKAMIYA

IPC: C09D1/00 ,  C23C26/00 ,  B05D1/28 ,  B05D3/02 ,  B05D7/14 ,  H01F1/147

Abstract: An insulating coating treatment liquid for forming a chromium-free insulating coating on a surface of a grain-oriented electrical steel sheet, the insulating coating treatment liquid including at least one phosphate salt selected from phosphate salts of any of Mg, Ca, Ba, Sr, Zn, Al, and Mn and including colloidal silica and particles of a metal-element-containing compound. A content of the colloidal silica in terms of SiO2, on a solids basis, is 50 to 120 parts by mass, and a content of the particles of a metal-element-containing compound in terms of elemental metal is 5 to 60 parts by mass, per 100 parts by mass of the at least one phosphate salt, and the insulating coating treatment liquid has a thixotropic index (TI) of 1.00 or greater and 10.00 or less.

公开(公告)号：US20170088915A1

公开(公告)日：2017-03-30

申请号：US15310904

申请日：2015-05-11

Applicant: JFE STEEL CORPORATION

Inventor： Ryuichi SUEHIRO ,  Takashi TERASHIMA ,  Makoto WATANABE ,  Toshito TAKAMIYA ,  Takeshi IMAMURA

IPC: C21D9/46 ,  C21D3/04 ,  C22C38/60 ,  C22C38/34 ,  C22C38/32 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F41/02 ,  H01F1/03 ,  C21D8/12

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  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 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60 ,  H01F1/0306 ,  H01F1/16 ,  H01F41/0233

Abstract: A method for producing a grain-oriented electrical steel sheet by subjecting a slab of an inhibitor-less ingredient system containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.010-0.8 mass % and extremely decreased Al, N, Se and S to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within range of 700-800° C. in a heating process of 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 100° C./s and heating rate R2 between T1 and T2 is set to not more than 15° C./s, whereby grain-oriented electrical steel sheet having excellent iron loss property and coating peeling resistance is obtained in the inhibitor-less ingredient system while ensuring decarburization property even when rapid heating is performed during decarburization annealing.

公开(公告)号：US20160305026A1

公开(公告)日：2016-10-20

申请号：US15038501

申请日：2015-01-14

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Makoto WATANABE ,  Masanori UESAKA ,  Ryuichi SUEHIRO ,  Toshito TAKAMIYA

IPC: C23C22/12 ,  C21D9/46 ,  C21D6/00 ,  C23C22/78 ,  C23C22/18 ,  C23C22/20 ,  C23C22/22 ,  H01F1/18 ,  C23C22/74

CPC classification number: C23C22/12 ,  C21D6/008 ,  C21D8/1288 ,  C21D9/46 ,  C23C22/182 ,  C23C22/188 ,  C23C22/20 ,  C23C22/22 ,  C23C22/74 ,  C23C22/78 ,  H01F1/18

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 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).

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

IPC: H01F1/147 ,  C23G1/08 ,  C23C22/78 ,  H01F27/34

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.

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.

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).

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

IPC: C21D8/12 ,  C23C22/33 ,  C21D9/46 ,  H01F1/18

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.

公开(公告)号：US20250146096A1

公开(公告)日：2025-05-08

申请号：US18838042

申请日：2023-03-02

Applicant: JFE STEEL CORPORATION

Inventor： Rieko IZUMI ,  Toshito TAKAMIYA ,  Akio FUJITA ,  Toru NAKASHIMA ,  Norihisa OKADA

IPC: C21D9/46 ,  C21D8/12

Abstract: Provided is a way to inhibit propagation of edge cracks. A method of producing a grain-oriented electrical steel sheet including, before final annealing, local strain with an indentation amount from the steel sheet surface of 5 μm to 30 μm is applied to a linear region that, when coiled and the coil is charged into a final annealing furnace, is separated from the axial end of the coil that comes into contact with a coil receiving base of the final annealing furnace by 5 mm or more and 20 mm or less in the axial direction of the coil and that extends continuously or discontinuously in a direction on that intersects the axial direction, in order to produce crystal grains having a misorientation angle of 15° or more from Goss orientation grains along 50% or more of the total length of the linear region.

公开(公告)号：US20220091597A1

公开(公告)日：2022-03-24

申请号：US17423111

申请日：2020-01-08

Applicant: JFE STEEL CORPORATION

Inventor： Shinji KOSEKI ,  Masaru FUKUMURA ,  Hiroyasu SHIGEMORI ,  Shiguma UNO ,  Noriko OZAWA ,  Toshito TAKAMIYA

IPC: G05B19/418

Abstract: An analysis system 10 includes: an operational data acquisition unit 11 that acquires operational data including an operational state of a production line 20; a product information acquisition unit 13 that acquires a state of a product manufactured in the production line and outputs the state of the product as product information; a production state analyzer 12 that obtains a predetermined physical quantity of the product on a basis of the operational data acquired by the operational data acquisition unit 11 and outputs the predetermined physical quantity as information on the physical quantity; and a correlation analyzer 14 that performs analysis of a correlation between the information on the physical quantity and the product information.