公开(公告)号：US20230250503A1

公开(公告)日：2023-08-10

申请号：US18003343

申请日：2021-06-28

Applicant: JFE STEEL CORPORATION

Inventor： Yukihiro SHINGAKI ,  Tetsuya ARAKAWA ,  Yusuke SHIMOYAMA ,  Ayaka SERA

IPC: C21D8/12 ,  C22C38/08 ,  C22C38/04 ,  C22C38/02 ,  C21D9/46

CPC classification number: C21D8/1222 ,  C21D8/1233 ,  C21D8/1266 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C21D2201/05

Abstract: Provided is a method of manufacturing a grain-oriented electrical steel sheet that has a uniform texture all along the longitudinal direction and has small fluctuations in magnetic properties. The method includes subjecting a predetermined hot-rolled and annealed sheet to cold rolling, where at least one time of cold rolling has a total rolling reduction of 80 % or more and is performed by a tandem mill, rolling performed in at least one stand of the tandem mill is performed under conditions of a rolling reduction of 30 % or more and a biting temperature To °C of a work roll of the stand, and a temperature at which either or both of a leading end and a tail end of the hot-rolled and annealed sheet are bitten by the work roll is 70° C. or higher and at least 10° C. higher than the temperature To °C.

公开(公告)号：US20250109451A1

公开(公告)日：2025-04-03

申请号：US18689864

申请日：2022-10-14

Applicant: JFE STEEL CORPORATION

Inventor： Ayaka SERA ,  Yukihiro SHINGAKI

IPC: C21D8/12 ,  C21D9/46

Abstract: Provided is a grain-oriented electrical steel sheet having excellent magnetic properties. In an aging treatment method of subjecting a steel sheet before final cold rolling to aging treatment in a process of producing a grain-oriented electrical steel sheet, a total aging amount of carbon during a period from completion of cooling in annealing before the final cold rolling to biting in the final cold rolling is 0.02 μm to 0.5 μm in terms of diffusion distance of carbon.

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).