公开(公告)号：US20250146110A1

公开(公告)日：2025-05-08

申请号：US18697730

申请日：2022-10-31

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Ryota HOSOYA ,  Hiroi YAMAGUCHI

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

Abstract: This disclosure discloses a method for manufacturing a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet manufactured by the method. The method comprises heating a slab having a predetermined composition by induction heating in a frequency range of 20 to 1000 Hz under predetermined conditions, where the average current flowing in the coil is monotonically decreased as time passes during slab heating; subjecting the slab to finish rolling performed with the rolling finish temperature set to 950° C. or lower at one or both of the leading or trailing end; soaking the hot-rolled sheet at 750° C. or higher for 5 to 90 seconds to obtain a hot band annealed sheet; then cold rolling the annealed sheet once, or twice or more with intermediate annealing performed therebetween to obtain a cold-rolled sheet having a final sheet thickness; and subjecting the cold-rolled sheet to primary and secondary recrystallization annealings.

公开(公告)号：US20230037579A1

公开(公告)日：2023-02-09

申请号：US17778704

申请日：2020-11-10

Applicant: JFE STEEL CORPORATION

Inventor： Yuu NAGAI ,  Ryuichi SUEHIRO ,  Ryota HOSOYA

IPC: B21B15/00 ,  B21B1/22

Abstract: A steel strip notching method including forming a notch at an end portion of a joint in a strip width direction formed by joining a trailing end of a preceding steel strip to a leading end of a succeeding steel strip, and removing a region of the notch through grinding by cutting the region with a rotary grinding tool by feeding the tool in the strip width direction, feeding the tool in a strip vertical direction at a feed rate within a predetermined range with respect to a feed rate of the tool in the strip width direction, giving a predetermined feed amount in a strip longitudinal direction while feeding the tool by a predetermined feed amount in the strip width direction simultaneously with feeding the tool in the strip vertical direction, and cutting the region while oscillating the tool in the strip longitudinal direction.