公开(公告)号：US20210310096A1

公开(公告)日：2021-10-07

申请号：US17349912

申请日：2021-06-17

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Hirotaka INOUE ,  Seiji OKABE

IPC: C21D9/46 ,  C22C38/60 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  G01R33/18 ,  C23C22/38 ,  H01F1/18 ,  C23C22/74 ,  C21D3/04 ,  C21D6/00 ,  C21D8/00 ,  C23C22/08 ,  G01H9/00 ,  H01F10/08

Abstract: Provided is a method for manufacturing a grain-oriented electrical steel sheet. The method comprises: hot rolling a slab to obtain a hot rolled sheet; subjecting the hot rolled sheet to hot band annealing as necessary; subjecting the hot rolled sheet to cold rolling; subjecting the cold rolled sheet to decarburization annealing; applying an annealing separator having MgO as a main component onto a surface of the decarburization annealed sheet and subjecting the decarburization annealed sheet to final annealing to form the forsterite film; and applying an insulating coating treatment liquid onto the final annealed sheet and subjecting the final annealed sheet to flattening annealing to form a tension-applying insulating coating. A difference in total tensions between one and opposite surfaces of the sheet is less than 0.5 MPa. A difference in tensions between the forsterite films in one and opposite surfaces of the sheet is 0.5 MPa or more.

公开(公告)号：US20210043358A1

公开(公告)日：2021-02-11

申请号：US16966256

申请日：2019-01-31

Applicant: JFE STEEL CORPORATION

Inventor： Hirotaka INOUE ,  Seiji OKABE ,  Takeshi OMURA

IPC: H01F27/245 ,  H01F41/02 ,  H01F1/147

Abstract: A grain-oriented electrical steel sheet for a wound transformer core. The steel sheet having a sheet thickness t, where t and an iron loss deterioration ratio obtained by subjecting the steel sheet under elliptic magnetization satisfy the following relations: (i) when t≤0.20 mm, the iron loss deterioration ratio is 60% or less; (ii) when 0.20 mm

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：US20200087746A1

公开(公告)日：2020-03-19

申请号：US16468087

申请日：2017-12-14

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi OMURA ,  Hirotaka INOUE ,  Kunihiro SENDA ,  Seiji OKABE

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/44 ,  C22C38/34 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  H01F1/147 ,  H01F27/245 ,  H01F41/02

Abstract: Provided is a grain-oriented electrical steel sheet having better transformer iron loss property than conventional grain-oriented electrical steel sheets. A grain-oriented electrical steel sheet comprises: a steel substrate; a forsterite film on a surface of the steel substrate; and a Cr-depleted layer at a boundary between the steel substrate and the forsterite film, the Cr-depleted layer having a Cr concentration that is 0.70 times to 0.90 times a Cr concentration of the steel substrate.