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：US20230326638A1

公开(公告)日：2023-10-12

申请号：US18041797

申请日：2021-08-31

Applicant: JFE STEEL CORPORATION

Inventor： Takuya YAMADA ,  Takashi TERASHIMA

IPC: C21D8/12 ,  C22C38/60 ,  C22C38/02 ,  H01F1/16 ,  C22C38/04 ,  C21D6/00 ,  C21D9/46 ,  C22C38/06 ,  C22C38/00

CPC classification number: H01F1/16 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C22C2202/02

Abstract: To stably produce grain-oriented electrical steel sheets with excellent film properties and magnetic properties. A method of producing a grain-oriented electrical steel sheet of this disclosure comprises subjecting a steel slab containing predetermined additive elements to hot rolling; subjecting the hot-rolled sheet to cold rolling to have a final sheet thickness; subjecting the cold-rolled sheet to decarburization annealing; applying an annealing separator having MgO as a main component to the decarburization annealing sheet; and subjecting the decarburization annealing sheet to finish annealing. The main component of the annealing separator has a BET specific surface area ratio H2O/N2 of 0.6 to 1.6 and a percentage of particles with a particle size of 40 µm or more in a slurry state of 5 mass% or less.

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：US20180017868A1

公开(公告)日：2018-01-18

申请号：US15548836

申请日：2016-02-01

Applicant: JFE STEEL CORPORATION

Inventor： Ryuichi SUEHIRO ,  Takashi TERASHIMA

IPC: G03F7/039 ,  C21D6/00 ,  G03F7/022 ,  C25F3/06 ,  C22C38/06 ,  G03F7/20 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  G03F7/32 ,  C22C38/04

CPC classification number: G03F7/039 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1277 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25F3/06 ,  G03F7/022 ,  G03F7/023 ,  G03F7/027 ,  G03F7/031 ,  G03F7/033 ,  G03F7/038 ,  G03F7/20 ,  G03F7/325 ,  G03F7/40 ,  H01F1/16

Abstract: Provided is a manufacturing method for a grain-oriented electrical steel sheet with which it is possible to achieve both good iron loss and high productivity. In groove formation for magnetic domain refinement, a resist containing a photosensitive resin is applied, photoexposed, and developed to form an exposed steel substrate portion having a linear shape. Subsequently, electrolytic etching is performed at current density ρ=I/S of 7.5 A/cm2 or more with respect to the exposed steel substrate portion, where I represents current supplied to an electrode and S represents surface area of the exposed steel substrate portion in a steel sheet surface of equal surface area to the electrode.

公开(公告)号：US20150354051A1

公开(公告)日：2015-12-10

申请号：US14761419

申请日：2014-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Hiroshi MATSUDA ,  Hideyuki TAKAHASHI ,  Hiroi YAMAGUCHI ,  Yasuyuki HAYAKAWA ,  Yukihiro SHINGAKI ,  Takashi TERASHIMA

IPC: C23C8/38 ,  C23C8/80 ,  H01F41/02 ,  C21D9/00 ,  C21D9/46 ,  H01F1/16 ,  C23C8/26 ,  C21D8/12

CPC classification number: C21D8/1255 ,  C21D8/12 ,  C21D8/1272 ,  C21D9/0006 ,  C21D9/46 ,  C23C8/02 ,  C23C8/26 ,  C23C8/38 ,  C23C8/80 ,  H01F1/16 ,  H01F41/02 ,  H01J37/32018 ,  H01J37/3277

Abstract: Provided is an apparatus for nitriding a grain-oriented electrical steel sheet which is very useful in obtaining excellent magnetic properties with no variation, that enables generating glow discharge between positive electrodes and negative electrodes disposed in a nitriding zone and irradiating the generated plasma to a strip to perform appropriate nitriding.

Abstract translation: 本发明提供一种氮化方向性电磁钢板的装置，其在获得优异的磁特性而无变化的情况下非常有用，能够在设置在渗氮区域的正极和负极之间产生辉光放电，并将产生的等离子体照射到带材 进行适当的氮化处理。

公开(公告)号：US20240271241A1

公开(公告)日：2024-08-15

申请号：US18561448

申请日：2022-05-24

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Takuya YAMADA

IPC: C21D9/46 ,  C21D1/30 ,  C21D1/76 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D1/30 ,  C21D1/76 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  H01F1/14775 ,  C21D2201/05 ,  C22C2202/02

Abstract: Provided is a method for manufacturing a grain-oriented electrical steel sheet with excellent uniformity of magnetic properties in the sheet transverse direction without increasing production costs. An ignition loss of an annealing separator after drying: IGLOSS (mass %), a storage time of a cold-rolled steel sheet: T (hr), and a carbon dioxide concentration in a storage environment of the cold-rolled steel sheet: A (mass ppm) satisfy the following formula (1):








A
×
IGLOSS

≤



-
1500

×

Ln
⁡
(
T
)


+
9000.





(
1
)