公开(公告)号：US20230392223A1

公开(公告)日：2023-12-07

申请号：US18031246

申请日：2021-07-26

Applicant: JFE STEEL CORPORATION

Inventor： Makoto WATANABE ,  Takashi TERASHIMA ,  Karin KOKUFU

IPC: C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C21D9/46

CPC classification number: C21D6/008 ,  C22C38/02 ,  C22C38/04 ,  C21D9/46 ,  C21D2201/05

Abstract: A grain oriented electrical steel sheet has excellent insulation property and includes: a steel sheet; and a coating disposed on each of both surfaces of the steel sheet, wherein an interlaminar current value after a rubbing test is not more than 0.10 A, the rubbing test being conducted by stacking two sheets of the grain oriented electrical steel sheet and rubbing the two sheets against each other to make 90 reciprocations under conditions of a surface pressure of 200 Pa, a rubbing speed of 0.10 m/s, and a reciprocating stroke of 50 mm.

公开(公告)号：US20230250506A1

公开(公告)日：2023-08-10

申请号：US18003339

申请日：2021-06-29

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke SHIMOYAMA ,  Yukihiro SHINGAKI ,  Takashi TERASHIMA

IPC: C21D9/46 ,  C21D3/04 ,  C21D8/12 ,  C21D1/42 ,  C21D6/00 ,  C22C38/60 ,  C22C38/32 ,  C22C38/22 ,  C22C38/20 ,  C22C38/34 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D1/42 ,  C21D8/1283 ,  C21D6/005 ,  C21D6/008 ,  C21D6/001 ,  C21D6/002 ,  C22C38/60 ,  C22C38/32 ,  C22C38/22 ,  C22C38/20 ,  C22C38/34 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C22C38/001 ,  C21D2201/05 ,  C22C2202/02

Abstract: Provided is a method of manufacturing a grain-oriented electrical steel sheet with which a grain-oriented electrical steel sheet with excellent magnetic properties and little variation in iron loss in the longitudinal direction of a coil can be stably manufactured. The method includes subjecting a steel slab to hot-rolling and optionally to annealing, then performing cold rolling once or twice or more to obtain a cold-rolled sheet with a final sheet thickness, and then subjecting the cold-rolled sheet to decarburization annealing and then secondary recrystallization annealing, where immediately before final cold rolling, a steel sheet is heated at a heating rate of 100° C./s or more to a heating temperature of 100° C. or higher and 350° C. or lower, and a time from when the steel sheet reaches the heating temperature to when it is bitten in a first pass of final cold rolling is set to within 5 seconds.

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：US20190119773A1

公开(公告)日：2019-04-25

申请号：US16221890

申请日：2018-12-17

Applicant: JFE STEEL CORPORATION

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

IPC: C21D8/12 ,  C23C8/80 ,  H01F1/16 ,  C23C8/38 ,  H01J37/32 ,  C23C8/02 ,  H01F41/02 ,  C23C8/26 ,  C21D9/46 ,  C21D9/00

Abstract: Provided is a method 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.

公开(公告)号：US20150368732A1

公开(公告)日：2015-12-24

申请号：US14764650

申请日：2014-02-18

Applicant: JFE Steel Corporation

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

IPC: C21D8/12 ,  C21D9/46 ,  C21D6/00 ,  C23C8/50

CPC classification number: C21D8/1255 ,  C21D6/008 ,  C21D8/1272 ,  C21D9/46 ,  C23C8/50 ,  H01F1/16

Abstract: Provided is a method for nitriding a grain-oriented electrical steel sheet which is very useful in obtaining excellent magnetic properties with no variation by immersing a strip in a molten salt bath after cold rolling and before secondary recrystallization annealing during a production process of a grain-oriented electrical steel sheet, to subject the strip to continuous nitriding to uniformly disperse inhibitor forming elements over the full length and full width of the strip.

Abstract translation: 提供一种氮化方向性电磁钢板的方法，其在获得优异的磁性能方面非常有用，在冷轧后将条带浸入熔盐浴中，并且在颗粒生产过程中进行二次再结晶退火之前， 使带材连续渗氮以在条带的全长和全宽上均匀分散抑制剂形成元件。

公开(公告)号：US20150318094A1

公开(公告)日：2015-11-05

申请号：US14650378

申请日：2013-12-25

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro SHINGAKI ,  Hiroi YAMAGUCHI ,  Yuiko WAKISAKA ,  Hiroshi MATSUDA ,  Takashi TERASHIMA

IPC: H01F1/147 ,  C21D9/46 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  H01F41/00 ,  C22C38/60 ,  C22C38/06 ,  H01F1/18 ,  H01F41/02 ,  C23C8/26 ,  C21D8/12 ,  C22C38/16

CPC classification number: H01F1/14783 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/22 ,  C22C38/60 ,  C23C8/26 ,  H01F1/16 ,  H01F1/18 ,  H01F41/005 ,  H01F41/02

Abstract: A method for producing grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a composition consisting of, by mass % or mass ppm, C: 0.08% or less, Si: 2.0% to 4.5% and Mn: 0.5% or less, S, Se, and O: less than 50 ppm each, sol.Al: less than 100 ppm, N: 80 ppm or less, and the balance being Fe and incidental impurities, and satisfying the relation of sol.Al (ppm)−N (ppm)×(26.98/14.00)≦30 ppm; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment, under specific condition, before, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and subjecting the cold rolled sheet to secondary recrystallization annealing.

Abstract translation: 制造方向性电磁钢板的方法包括：对钢坯进行热轧，得到热轧板，所述钢坯以质量％或质量ppm计，C：0.08％以下，Si： 2.0％〜4.5％，Mn：0.5％以下，S，Se和O：小于50ppm，sol.Al：小于100ppm，N：80ppm以下，余量为Fe和附带杂质 ，并满足sol.Al（ppm）-N（ppm）×（26.98 / 14.00）＆nlE; 30ppm的关系; 然后对热轧板进行退火和轧制以获得冷轧板; 然后在特定条件下，在一次再结晶退火之前，期间或之后对冷轧板进行氮化处理; 然后在冷轧板上涂布退火分离剂; 并对冷轧板进行二次再结晶退火。

公开(公告)号：US20240247333A1

公开(公告)日：2024-07-25

申请号：US18264928

申请日：2022-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Makoto WATANABE ,  Takashi TERASHIMA ,  Takuya YAMADA

IPC: C21D11/00 ,  C21D1/26 ,  C21D3/04 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04

CPC classification number: C21D11/00 ,  C21D1/26 ,  C21D3/04 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04

Abstract: In determining the conditions for final annealing, information on the concentration of enriched components over the entire length and width of the steel sheet after decarburization annealing is obtained, the optimum function of product properties in the relationship between enriched components and control conditions for final annealing is obtained in advance, and the distribution of the control conditions for final annealing within the coil were considered while determining the control conditions for final annealing such that the area where the deviation of the product properties from the above optimum function is within a range of ±δ is maximized over the entire length and width.

公开(公告)号：US20240026482A1

公开(公告)日：2024-01-25

申请号：US18258327

申请日：2022-01-20

Applicant: JFE STEEL CORPORATION

Inventor： Takuya YAMADA ,  Makoto WATANABE ,  Takashi TERASHIMA

IPC: C21D9/46 ,  C22C38/12 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C22C38/14 ,  C21D8/12 ,  C21D6/00

CPC classification number: C21D9/46 ,  C22C38/12 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/001 ,  C22C38/14 ,  C22C38/002 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D6/008 ,  C21D6/005 ,  C22C2202/02 ,  C21D2201/05

Abstract: Provided is a method for stably producing a grain-oriented electrical steel sheet with excellent magnetic properties by effectively purifying inhibitors. The method for producing a grain-oriented electrical steel sheet includes using a steel slab containing a predetermined amount of at least one of Ti, Zr, Hf, V, Nb, and Ta, and applying an annealing separator, in which 1 part by mass to 10 parts by mass of a metal compound is added with respect to 100 parts by mass of MgO, on the steel sheet surface with a ratio of particles with a particle size of 1 μm or more in the metal compound being 0.0010 particles/μm2 or less.

公开(公告)号：US20220170130A1

公开(公告)日：2022-06-02

申请号：US17593860

申请日：2020-03-27

Applicant: JFE STEEL CORPORATION

Inventor： Makoto WATANABE ,  Masanori TAKENAKA ,  Takashi TERASHIMA

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147 ,  H01F41/02

Abstract: Provided is a grain-oriented electrical steel sheet having a film that is effective for the magnetic properties of the steel sheet and particularly effective for iron loss reduction and has favorable adhesion. In a grain-oriented electrical steel sheet, an insulating film partially enters into a steel substrate to form an anchor part, a depth of the anchor part from the surface of the steel substrate is 3.5 μm or less, and a number of neck parts of 5 μm2 or less in area is 0.06/μm2 or less and a number of neck parts of 10 μm2 to 40 μm2 in area is 0.005/μm2 or more and 0.011/μm2 or less, where each neck part is a remaining part of the insulating film on the surface of the steel substrate when peeling the insulating film from the steel substrate in a bend test for the grain-oriented electrical steel sheet.

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.