公开(公告)号：US20230323497A1

公开(公告)日：2023-10-12

申请号：US18042299

申请日：2021-08-25

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Karin SHIROYANAGI

IPC: C21D8/12

CPC classification number: C21D8/1283 ,  C21D8/1272 ,  C21D2201/05

Abstract: Provided is a powder for annealing separator that is used for a grain-oriented electrical steel sheet and enables obtainment of a grain-oriented electrical steel sheet having excellent magnetic properties as a result of favorable purification of impurities in steel. The powder for annealing separator contains magnesium oxide as a main component, and has a nitrogen gas permeability of 0.020 cm/s or more and 0.50 cm/s or less in a state of being applied between coiled steel sheets before start of secondary recrystallization.

公开(公告)号：US20220195553A1

公开(公告)日：2022-06-23

申请号：US17593560

申请日：2020-03-26

Applicant: JFE STEEL CORPORATION

Inventor： Hiroi YAMAGUCHI ,  Takashi TERASHIMA ,  Makoto WATANABE

IPC: C21D9/46 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147 ,  H01F41/02

Abstract: Provided is a method of producing a grain-oriented electrical steel sheet having uniform and good coating properties and magnetic properties throughout the length and/or width of the steel sheet. The method comprises: subjecting a steel slab to hot rolling, to cold rolling once or twice or more with intermediate annealing therebetween, and to primary recrystallization annealing; applying a liquid or slurry annealing separator to a resultant steel sheet; and thereafter coiling the steel sheet and subjecting the steel sheet to final annealing, wherein, before, after, or simultaneously with the application of the annealing separator, an additive for changing a composition of the annealing separator is adhered to the steel sheet at a weight ratio of 15% or less to a total of the annealing separator and the additive so as to vary the composition of the annealing separator in a longitudinal direction and/or width direction of the steel sheet.

公开(公告)号：US20220074012A1

公开(公告)日：2022-03-10

申请号：US17417375

申请日：2019-12-26

Applicant: JFE STEEL CORPORATION

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

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

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 and 0.01 mass % or more and 0.10 mass % or less of P, 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 0.0050 mass % or more and 0.50 mass % or less, where an amount of P adsorbed on per 1 g of the titanium oxide is 1.5×10−4 g or more and 1.0×10−3 g or less.

公开(公告)号：US20200010917A1

公开(公告)日：2020-01-09

申请号：US16483829

申请日：2018-01-17

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Takumi UMADA ,  Makoto WATANABE ,  Toshito TAKAMIYA

IPC: C21D8/12 ,  C22C38/00

Abstract: In a grain-oriented electrical steel sheet, comprising magnetic domains refined by a plurality of linear grooves in a surface of a steel sheet, each of the linear grooves is provided on its floor with a plurality of recessed parts aligned in a direction in which the linear groove extends, at a predetermined interval p (μm), and the recessed part is made to have a predetermined depth d (μm). In this way, it is possible to provide a grain-oriented electrical steel sheet having further improved iron loss properties while having reduced magnetic flux density reduction.

公开(公告)号：US20180371621A1

公开(公告)日：2018-12-27

申请号：US16117427

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

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 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：US20170137633A1

公开(公告)日：2017-05-18

申请号：US15118428

申请日：2015-03-02

Applicant: JFE STEEL CORPORATION

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

IPC: C09D1/00 ,  C23C30/00

CPC classification number: C09D1/00 ,  C23C22/08 ,  C23C22/12 ,  C23C22/18 ,  C23C22/20 ,  C23C22/22 ,  C23C22/74 ,  C23C30/00

Abstract: By using a treatment solution for chromium-free insulating coating containing one or more of a Mg phosphate, Ca phosphate, Ba phosphate, Sr phosphate, Zn phosphate, Al phosphate, and Mn phosphate, wherein colloidal silica is contained in an amount of 50 to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of SiO2, and a water-soluble metal salt of Mg, Ca, Ba, Sr, Zn, Al, and Mn is contained to adjust the molar ratio between M2+(=Mg,Ca,Ba,Sr,Zn,Mn) and/or M3+(=Al) which are metallic elements contained in the treatment solution and P to a range of 0.6≦(M2++1.5×M3+)/P≦1.0, chromium-free insulating coating that provides excellent moisture absorption resistance for a long period and has a sufficient iron loss reduction effect can be obtained at low cost while minimizing the amount of expensive Ti such as Ti chelate used or without using such expensive Ti at all.

公开(公告)号：US20160260531A1

公开(公告)日：2016-09-08

申请号：US15028841

申请日：2014-10-23

Applicant: JFE STEEL CORPORATION

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

IPC: H01F1/147 ,  C22C38/16 ,  C22C38/06 ,  C21D8/12 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C22C38/60 ,  C22C38/04

CPC classification number: H01F1/14783 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0289 ,  C21D8/12 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1272 ,  C21D8/1283 ,  C21D8/1288 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/60 ,  C23C22/33 ,  C23C22/74 ,  H01F1/18

Abstract: There is provided a grain-oriented electrical steel sheet stably having excellent magnetic characteristics and coating adhesion even when a rapid heating is conducted in a primary recrystallization annealing (decarburization annealing). Concretely, it is a grain-oriented electrical steel sheet provided on its sheet surface with a tension-applying type insulation coating constituted with a coating layer A formed on a steel sheet side and mainly composed of an oxide and a coating layer B formed on a surface side and mainly composed of glass, characterized in that a ratio R (σB/σA) of a tension σB of the coating layer B on the surface side applied to the steel sheet to a tension σA of the coating layer on the steel sheet side A applied to the steel sheet is within a range of 1.20-4.0.

Abstract translation: 即使在一次再结晶退火（脱碳退火）中进行快速加热，也提供了稳定地具有优异的磁特性和涂层粘附性的晶粒取向电工钢板。 具体地说，它是一种在其表面上设置有张力施加型绝缘涂层的晶粒取向电工钢板，其由在钢板侧形成的主要由氧化物和涂层B形成的涂层B构成， 表面侧，主要由玻璃构成，其特征在于，涂布在钢板表面侧的涂层B的张力σB与钢板侧的涂层的张力σA的比率R（σB/σA） 应用于钢板的A在1.20〜4.0的范围内。

公开(公告)号：US20150361544A1

公开(公告)日：2015-12-17

申请号：US14761707

申请日：2014-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Hiroshi MATSUDA ,  Hideyuki TAKAHASHI ,  Hiroi YAMAGUCHI ,  Yasuyuki HAYAKAWA ,  Takashi TERASHIMA ,  Yuiko WAKISAKA

IPC: C23C8/38 ,  C21D8/12 ,  H01F1/16 ,  C22C38/02 ,  H01F1/147 ,  C23C8/26 ,  C21D9/46

CPC classification number: C23C8/38 ,  C21D1/09 ,  C21D1/773 ,  C21D8/12 ,  C21D8/1255 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/02 ,  C23C8/02 ,  C23C8/26 ,  H01F1/14775 ,  H01F1/16

Abstract: Provided is an apparatus for continuously nitriding a strip continuously being fed after cold rolling and before secondary recrystallization annealing in a production line of a grain-oriented electrical steel sheet, comprising: a nitriding zone for nitriding the strip; a cooling zone for cooling the strip; and an optional heating zone provided upstream of the nitriding zone for heating the strip, wherein, the nitriding zone is provided with glow discharge electrodes, and by plasma nitriding the strip by glow discharge with the glow discharge electrodes functioning as positive electrodes and the strip functioning as a negative electrode, inhibitor forming elements are uniformly dispersed over the full length and full width of the strip and a grain-oriented electrical steel sheet with excellent magnetic properties with no variation is obtained.

Abstract translation: 本发明提供一种用于在冷轧后连续进料的条带和在取向电工钢板的生产线中的二次再结晶退火之前连续氮化的装置，包括：氮化氮化带， 用于冷却带材的冷却区域; 以及可选的加热区，设置在氮化区的上游，用于加热带，其中，氮化区设置有辉光放电电极，并且通过辉光放电等离子体氮化该带，其中辉光放电电极用作正电极，并且带的功能 作为负极，抑制剂形成元件在条带的全长和全宽度上均匀分散，并且获得了具有优异的磁性能而没有变化的晶粒取向电工钢板。

公开(公告)号：US20250116005A1

公开(公告)日：2025-04-10

申请号：US18729961

申请日：2022-09-28

Applicant: JFE Steel Corporation

Inventor： Takashi TERASHIMA ,  Karin KOKUFU

IPC: C23C22/78 ,  C21D8/12 ,  C21D9/46 ,  C23C22/07 ,  C23C28/04

Abstract: An electrical steel sheet provided with an insulating coating is disclosed. A pre-treatment liquid to be used on an electrical steel sheet having a forsterite coating on a surface thereof before applying an insulating coating treatment liquid containing a phosphate is also disclosed. When a phosphate concentration of the pre-treatment liquid is defined as A mass % in terms of H3PO4, a refractive index R of the pre-treatment liquid satisfies Formula (1): 9.0×10−4×A+1.3340≤R   (1).

公开(公告)号：US20240249863A1

公开(公告)日：2024-07-25

申请号：US18561412

申请日：2022-05-27

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Yukihiro SHINGAKI ,  Masanori TAKENAKA ,  Takashi TERASHIMA

IPC: H01F1/147 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/34 ,  C22C38/60

CPC classification number: H01F1/14791 ,  C21D1/74 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/20 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/34 ,  C22C38/60 ,  C22C2202/02

Abstract: To provide a grain-oriented electrical steel sheet with good processing accuracy in rounding while maintaining excellent magnetic properties, and a producing method thereof. Disclosed is the method including: subjecting a steel material to heating to 1300° C. or higher and hot rolling, subjecting the resulting sheet directly, or after subjection to hot-rolled sheet annealing, to at least two cycles of cold rolling with intermediate annealing therebetween, decarburization annealing, application of an annealing separator to a surface of the sheet, final annealing, in which maximum arrival temperatures in the first and second cycles of the cold rolling satisfy a predetermined relation, total rolling reductions in the first and second cycles of the cold rolling satisfy a predetermined relation, and in the final annealing, an average heating rates in temperature ranges from 50° C. to 1000° C. and from 1000° C. to (maximum arrival temperature—50° C.) satisfy a predetermined relation.