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

IPC: C22C38/18 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00

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.

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

IPC: C23C22/07 ,  H01B13/06 ,  H01B3/00 ,  C23C22/82

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.

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.

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.

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：US20160319390A1

公开(公告)日：2016-11-03

申请号：US15208720

申请日：2016-07-13

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Yukihiro SHINGAKI ,  Makoto WATANABE ,  Ryuichi SUEHIRO ,  Toshito TAKAMIYA

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/60 ,  C22C38/40 ,  C22C38/00 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/12 ,  C22C38/16

CPC classification number: C21D9/46 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60 ,  H01F1/14775 ,  H01F1/16

Abstract: In a method for producing a grain-oriented electrical steel sheet by including a series of steps of hot rolling a raw steel material containing C: 0.002-0.10 mass %, Si: 2.0-8.0 mass % and Mn: 0.005-1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled steel sheet after or without hot band annealing to one stage cold rolling or two or more stage cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to decarburization annealing combined with primary recrystallization annealing, applying an annealing separator to the steel sheet surface, and then subjecting to a final annealing.

Abstract translation: 在通过以下步骤的制造方向，其特征在于，包括将C：0.002〜0.10质量％，Si：2.0〜8.0质量％，Mn：0.005〜1.0质量％的粗钢材热轧的工序， 得到热轧板，在热轧带钢退火后进行一次冷轧，或者对其进行中间退火的两台以上的阶段冷轧，得到最终板厚的冷轧板，对冷轧 轧制板与脱碳退火结合一次再结晶退火，在钢板表面上涂布退火分离剂，然后进行最终退火。

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。