公开(公告)号：US20240150874A1

公开(公告)日：2024-05-09

申请号：US18281903

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Tomohito TANAKA ,  Masataka IWAKI ,  Nobusato MORISHIGE ,  Takashi KATAOKA ,  Hideyuki HAMAMURA

IPC: C22C38/02 ,  B23K26/06 ,  B23K26/352 ,  B23K101/18 ,  B23K103/04 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04

CPC classification number: C22C38/02 ,  B23K26/0626 ,  B23K26/352 ,  C21D8/1283 ,  C21D8/1288 ,  C22C38/004 ,  C22C38/04 ,  B23K2101/18 ,  B23K2103/04 ,  C21D2201/05

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, in the base steel sheet, a plurality of linear strains that extend continuously or intermittently in a direction intersecting with a rolling direction are present, and intervals in the rolling direction of the plurality of linear strains adjacent to each other are 10 mm or less, in a region where the strains are present, a closure domain is present, a length d of the closure domain in a sheet thickness direction from a surface of the base steel sheet is 30 to 60 μm, a length w in the rolling direction is 200 μm or less, and a ratio mid of a depth m from the surface of the base steel sheet where a compressive strain in the rolling direction present in the closure domain exhibits a maximum value to the length d is in a range of more than 0.30 and less than 0.90.

公开(公告)号：US11939641B2

公开(公告)日：2024-03-26

申请号：US17263824

申请日：2019-07-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi Nakamura ,  Yusuke Kawamura ,  Shota Morimoto

IPC: C21D9/46 ,  C21D1/76 ,  C21D3/04 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/12 ,  H01F1/18

CPC classification number: C21D9/46 ,  C21D1/76 ,  C21D3/04 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/004 ,  C22C38/02 ,  C22C38/12 ,  H01F1/18 ,  C21D2201/05

Abstract: A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α1 β1 γ1) and (α2 β2 γ2) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥0.5°, and the boundary condition BB is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.

公开(公告)号：US20240071661A1

公开(公告)日：2024-02-29

申请号：US18259898

申请日：2022-01-11

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Meihong WU ,  Guobao LI ,  Shuangjie CHU ,  Zipeng ZHAO ,  Baojun LIU ,  Kanyi SHEN ,  Yongjie YANG ,  Zhuochao HU ,  Yaming JI ,  Chen LING

IPC: H01F1/18 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C21D8/12 ,  C21D9/52 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: H01F1/18 ,  C21D1/18 ,  C21D1/84 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/125 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D9/52 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B23K26/362 ,  C21D2201/05 ,  C22C2202/02

Abstract: A manufacturing method for low-magnetostrictive oriented silicon steel is provided, wherein the oriented silicon steel comprises a silicon steel substrate and an insulating coating on the surface of the silicon steel substrate. The manufacturing method comprises: performing single-sided laser etching on the silicon steel substrate, wherein the side of the silicon steel substrate, on which single-sided laser etching is performed, is a first surface, and the side opposite to the first surface is a second surface; determining a deflection difference between the first surface and the second surface based on the power of the laser etching, and determining a difference in the amount of the insulating coatings on the first surface and the second surface based on the deflection difference; and forming insulating coatings on the first surface and the second surface. The amount of the insulating coating on the second surface is greater than that on the first surface, and the amount of the insulating coating on the first surface and that on the second surface satisfy the difference in the amount of the insulating coatings. By using the manufacturing method in the present invention, the problem of a relatively large magnetostrictive deviation between two sides of oriented silicon steel caused by single-sided laser etching can be solved. Oriented silicon steel manufactured by the aforementioned manufacturing method is also provided. A transformer iron core prepared using the oriented silicon steel enables a transformer to have low noise during operation.

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：US20240011111A1

公开(公告)日：2024-01-11

申请号：US18253922

申请日：2021-09-29

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Yoshihisa ICHIHARA ,  Kunihiro SENDA

IPC: C21D8/12 ,  C22C38/02 ,  C22C38/04 ,  C21D10/00

CPC classification number: C21D8/1222 ,  C22C38/02 ,  C22C38/04 ,  C21D8/1233 ,  C21D8/1255 ,  C21D10/005 ,  C21D2201/05

Abstract: Provided is a grain-oriented electrical steel sheet comprising a magnetic flux density B8 of 1.92 T or more, wherein a ratio Wa/Wb of a film thickness Wa of a forsterite film on a strain-introduced surface to a film thickness Wb of a forsterite film on a non-strain-introduced surface is 0.5 or more, an average width of a magnetic domain discontinuous portion on the non-strain-introduced surface is 1.00 time or more of an average width of a magnetic domain discontinuous portion on the strain-introduced surface, the average width of the magnetic domain discontinuous portion on the non-strain-introduced surface is 400 μm or less, and compressive stress exists in a rolling direction in a range from a surface of the steel sheet that is the strain-introduced surface to at least 2 μm in a sheet thickness direction.

公开(公告)号：US20230407506A1

公开(公告)日：2023-12-21

申请号：US18251396

申请日：2021-11-05

Applicant: JFE STEEL CORPORATION

Inventor： Shunsuke YAMAMOTO ,  Katsutoshi TAKASHIMA ,  Mai AOYAMA ,  Yusuke OKUMURA ,  Tomomi KANAZAWA ,  Katsuya HOSHINO ,  Hiroshi MATSUDA ,  Ei OKUMURA ,  Yoichi MAKIMIZU ,  Masaki KOBA

IPC: C25D3/20 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C21D8/02 ,  C23C22/78 ,  C25D5/36 ,  C23C28/02

CPC classification number: C25D3/20 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C21D8/0236 ,  C21D8/0273 ,  C23C22/78 ,  C25D5/36 ,  C23C28/02 ,  C21D2201/05

Abstract: Provided is a steel sheet with excellent resistance to cracking in resistance welding at a welded portion, even if the crystal orientations of an Fe-based electroplating layer and a Si-containing cold-rolled steel sheet are integrated at a high ratio at the interface between the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet. Provided is an Fe-based electroplated steel sheet having a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface of more than 20.0 g/m2, where the crystal orientations of the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet are integrated at a ratio of more than 50% at the interface between the Fe-based electroplating layer and the Si-containing cold-rolled steel sheet.

公开(公告)号：US20230304123A1

公开(公告)日：2023-09-28

申请号：US18041798

申请日：2021-08-18

Applicant: JFE STEEL CORPORATION

Inventor： Kunihiro SENDA ,  Yoshihisa ICHIHARA ,  Takeshi OMURA

IPC: C21D10/00

CPC classification number: C21D10/005 ,  C21D2201/05 ,  C21D2221/00

Abstract: To provide a grain-oriented electrical steel sheet that can achieve both sufficiently low transformer core loss and sufficiently low noise. Disclosed is a grain-oriented electrical steel sheet having a tension coating on a surface thereof and subjected to magnetic domain refining treatment by generating linear closure domains extending in a direction within 30° of a transverse direction, in which an average interval L between adjacent closure domains is 15 mm or less, a depth ratio rd of a depth of the closure domains to a sheet thickness, calculated by a predetermined formula, is 35% or more, and a volume fraction rv of the closure domains, calculated by a predetermined formula, is 0.30% or more and 3.0% or less, and an area ratio rs of the closure domains, calculated by a predetermined formula, is 0.50% or more and 4.0% or less.

公开(公告)号：US11767571B2

公开(公告)日：2023-09-26

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 ,  C22C38/60 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/34

CPC classification number: C21D8/1277 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  H01F1/147 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/34 ,  C22C38/60

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：US20230243010A1

公开(公告)日：2023-08-03

申请号：US18008927

申请日：2021-06-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi KATAOKA ,  Haruhiko ATSUMI ,  Ryutaro YAMAGATA ,  Nobusato MORISHIGE ,  Kazutoshi TAKEDA

IPC: C21D8/12 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  C22C38/06 ,  C22C38/00 ,  C22C38/16 ,  C21D9/46 ,  C21D3/04

CPC classification number: C21D8/1283 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  C22C38/06 ,  C22C38/001 ,  C22C38/16 ,  C21D9/46 ,  C21D3/04 ,  C21D8/1222 ,  C22C38/002 ,  C21D8/1272 ,  C21D2201/05

Abstract: Provided is a production method for a grain-oriented electrical steel sheet that is thin and has excellent magnetic characteristics. An embodiment of the present invention provides a production method that is for a grain-oriented electrical steel sheet and that comprises: a hot rolling step; an optional hot-rolled sheet-annealing step; an acid-washing step; a cold rolling step; a primary recrystallization-annealing step; a finishing-annealing step; and a planarization-annealing step. In the acid-washing step, an acid-washing solution containing 0.0001-5.00 g/L of Cu is used. The thickness of a cold-rolled steel sheet is 0.15-0.23 mm. The average temperature increase rate in the temperature range of 30-400° C. in a temperature increase process in the primary recrystallization step is more than 50° C./sec but not more than 1000° C./sec.

公开(公告)号：US20230243009A1

公开(公告)日：2023-08-03

申请号：US18003499

申请日：2021-06-28

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro SHINGAKI ,  Yusuke SHIMOYAMA ,  Ayaka SERA

IPC: C21D8/12 ,  C22C38/04 ,  C21D1/34 ,  C22C38/02 ,  C22C38/08

CPC classification number: C21D8/1222 ,  C22C38/04 ,  C21D1/34 ,  C21D8/1272 ,  C22C38/02 ,  C22C38/08 ,  C21D8/1233 ,  C21D8/1266 ,  C21D2201/05

Abstract: Provided is a production method for a grain-oriented electrical steel sheet with which stable magnetic properties are obtained in the same coil. The method comprises: hot rolling a steel slab having a predetermined chemical composition, followed by annealing to obtain a hot-rolled and annealed sheet; cold rolling the hot-rolled and annealed sheet one time, or two times or more with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet, followed by subjecting to primary and secondary recrystallization annealing, wherein in the cold rolling, a rolling reduction ratio is 80% or more at least one time out of the one time or two times or more, and a steel sheet temperature T0 (° C.) while a rolling rate is a set value R0 (mpm) and a steel sheet temperature T1 (° C.) while the rolling rate is less than or equal to 0.5×R0 (mpm) satisfy a formula (1).