公开(公告)号：US20200332380A1

公开(公告)日：2020-10-22

申请号：US16901328

申请日：2020-06-15

Applicant: JFE STEEL CORPORATION

Inventor： Seiji OKABE ,  Shigehiro TAKAJO ,  Yasushi KITANI

IPC: C21D8/12 ,  C22C38/04 ,  C22C38/60 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  H01F41/00

Abstract: This device scans a high-energy beam in a direction traversing a feed path of a grain-oriented electrical steel sheet having subjected to final annealing so as to irradiate a surface of the steel sheet being passed through with the high-energy beam to thereby perform magnetic domain refinement, the device including an irradiation mechanism for scanning the high-energy beam in a direction orthogonal to the feed direction of the steel sheet, in which the irradiation mechanism has a function of having the scanning direction of the high-energy beam oriented diagonally, relative to the orthogonal direction, toward the feed direction at an angle determined based on a sheet passing speed of the steel sheet on the feed path.

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：US20190013126A1

公开(公告)日：2019-01-10

申请号：US16068121

申请日：2017-01-24

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Shigehiro TAKAJO ,  Hirotaka INOUE

IPC: H01F1/18 ,  C21D9/46 ,  C21D8/12 ,  H01F41/22

Abstract: An excellent low noise property and excellent low iron loss property are obtained. A grain-oriented electrical steel sheet includes refined magnetic domains formed by electron beam irradiation. When the maximum magnetic flux density is 1.7 T, the grain-oriented electrical steel sheet has a residual magnetic flux density of 0.1 to 0.7 times the residual magnetic flux density before the electron beam irradiation and a maximum magnetizing force of 1.1 to 2.0 times the maximum magnetizing force before the electron beam irradiation.

公开(公告)号：US20170016085A1

公开(公告)日：2017-01-19

申请号：US15121791

申请日：2015-02-24

Applicant: JFE Steel Corporation

Inventor： Hiroaki TODA ,  Shigehiro TAKAJO ,  Michiro KOMATSUBARA

IPC: C21D9/46 ,  H01F41/02 ,  H01F3/02 ,  C21D8/12 ,  C21D10/00

CPC classification number: C21D9/46 ,  C21D1/09 ,  C21D8/1216 ,  C21D8/1294 ,  C21D10/00 ,  C21D2201/05 ,  H01F1/16 ,  H01F3/02 ,  H01F41/0233

Abstract: A grain-oriented electrical steel sheet is subjected to magnetic domain refining treatment by irradiating a steel sheet surface with an electron beam having a beam diameter d of 0.40 mm or less, wherein a modulated irradiation line region is formed with repeating units connected to each other in the line region direction, a periodic distance of the repeating units in the modulated irradiation line region is ⅔×d mm to 2.5×d mm, a repeating interval of the modulated irradiation line region in the rolling direction is 4.0 mm to 12.5 mm, and intensity of the electron beam is not lower than an intensity with which long and narrow divided magnetic domains extending in the modulated irradiation line region direction are formed at least on an irradiated side, and not higher than an intensity with which coating damage does not occur and a plastic strain region is not formed on the irradiated side.

Abstract translation: 通过用光束直径d为0.40mm以下的电子束照射钢板表面，对晶粒取向电工钢板进行磁畴精制处理，其中以相互连接的重复单元形成调制后的照射线区域 在线区域方向上，调制照射线区域中的重复单元的周期距离为⅔×dmm〜2.5×dmm，调制后的照射线区域的滚动方向的重复间隔为4.0mm〜12.5mm， 并且电子束的强度不低于至少在照射侧形成在调制的照射线区域方向上延伸的长且窄的分割磁畴的强度，并且不高于不会发生涂层损伤的强度 并且在照射侧不形成塑性应变区域。

公开(公告)号：US20250101561A1

公开(公告)日：2025-03-27

申请号：US18729888

申请日：2023-02-17

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Makoto WATANABE ,  Masanari TOMOZAWA ,  Hiroi YAMAGUCHI ,  Shigehiro TAKAJO ,  Mari TAKAHASHI

IPC: C22C38/60 ,  C21D1/74 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/147

Abstract: Provided is a grain-oriented electrical steel sheet with good film adhesion. Among the elements present at grain boundaries between ceramic particles contained in a base film of the grain-oriented electrical steel sheet, either or both of S and Se elements are contained in a range of 0.02 at % to 2.00 at %.

公开(公告)号：US20240133003A1

公开(公告)日：2024-04-25

申请号：US18547692

申请日：2022-03-02

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Hiroi YAMAGUCHI

IPC: C22C38/02 ,  C21D8/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60

CPC classification number: C22C38/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60

Abstract: The method includes slab-heating a steel slab to a temperature of higher than a γ-phase precipitation temperature and 1380° C. or lower, subjecting the steel slab to rough rolling including at least two passes of rolling at a predetermined temperature with an introduced sheet thickness true strain εt of 0.50 or more and to finish rolling with a rolling finish temperature of 900° C. or higher to obtain a hot-rolled sheet, cooling the sheet for 1 second or longer at a cooling rate of 70° C./s or higher within 2 seconds after finish rolling, coiling the sheet at a coiling temperature of 600° C. or lower, performing hot-rolled sheet annealing for soaking at a predetermined soaking temperature, and then performing cold rolling, primary recrystallization annealing, and secondary recrystallization annealing.

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：US20190017139A1

公开(公告)日：2019-01-17

申请号：US16081121

申请日：2017-03-08

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Hirotaka INOUE ,  Shigehiro TAKAJO ,  Seiji OKABE

IPC: C21D8/12 ,  H01F1/147

Abstract: To reduce variations in iron loss among materials subjected to magnetic domain refining by electron beam irradiation and to stably obtain good iron loss properties, disclosed is a method of producing a grain-oriented electrical steel sheet including performing magnetic domain refining treatment by irradiating with an electron beam, in a pressure reduced area, a surface of a grain-oriented electrical steel sheet after subjection to final annealing, the method further including: before the irradiating with the electron beam, delivering the grain-oriented electrical steel sheet wound in a coil shape and heating the delivered grain-oriented electrical steel sheet to 50° C. or higher; and then cooling the grain-oriented electrical steel sheet such that the grain-oriented electrical steel sheet has a temperature of lower than 50° C. at the time of entering the pressure reduced area.

公开(公告)号：US20180221941A1

公开(公告)日：2018-08-09

申请号：US15750133

申请日：2016-07-20

Applicant: JFE STEEL CORPORATION

Inventor： Seiji OKABE ,  Takeshi IMAMURA ,  Shigehiro TAKAJO

IPC: B22D11/06

Abstract: A single roll type apparatus manufactures a metal thin strip by injecting a molten metal onto a cooling roll outer peripheral face solidifying it to manufacture the strip. An airflow blocking device for blocking the airflow along the cooling roll surface is at a molten metal injection nozzle upstream side for injecting the molten metal in the cooling roll rotation direction, and a carbon dioxide gas injection nozzle for forming a carbon dioxide flow on the cooling roll outer peripheral surface between the airflow blocking device and molten metal injection nozzle or forming a carbon dioxide atmosphere on the cooling roll surface between the airflow blocking device and the molten metal injection nozzle is disposed, and a foreign material removal device for removing foreign material attached to the cooling roll surface is disposed at an upstream side of the airflow blocking device in the rotation direction of the cooling roll.

公开(公告)号：US20160133368A1

公开(公告)日：2016-05-12

申请号：US14894697

申请日：2014-05-27

Applicant: JFE STEEL CORPORATION

Inventor： Seiji OKABE ,  Hirotaka INOUE ,  Shigehiro TAKAJO

IPC: H01F3/02 ,  C22C38/08 ,  C21D8/12 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  C22C38/06

CPC classification number: H01F3/02 ,  C21D8/125 ,  C21D8/1277 ,  C21D8/1288 ,  C22C38/00 ,  C22C38/001 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/18 ,  C22C38/60 ,  H01F1/16 ,  H01F27/245

Abstract: A grain-oriented electrical steel sheet subjected to magnetic domain refining by linearly introducing strains in a direction intersecting a rolling direction of the steel sheet repeatedly with intervals in the rolling direction, wherein if a repeating interval of the strains in the rolling direction is d (mm) and, when the steel sheet is placed on a flat surface, a mean value of difference between a height from the flat surface in linear strain-introduced areas of a steel sheet surface and a height from the flat surface in intermediate points between adjacent linear strain-introduced areas is h (mm), then the ratio h/d of the h to the d is 0.0025 or more and 0.015 or less.

Abstract translation: 通过以与轧制方向间隔反复地沿与钢板的轧制方向交叉的方向线性地引入应变而进行磁畴精制的晶粒取向电工钢板，其中如果轧制方向上的应变的重复间隔为d（ mm），并且当钢板被放置在平坦表面上时，在相邻的中间点之间的钢板表面的线性应变导入区域中的平坦表面的高度与来自平坦表面的高度之间的差的平均值 线性应变导入面积为h（mm），则h与d的比率h / d为0.0025以上且0.015以下。