公开(公告)号：US20190256938A1

公开(公告)日：2019-08-22

申请号：US16344934

申请日：2017-11-01

Applicant: JFE STEEL CORPORATION

Inventor： Masanori TAKENAKA ,  Takeshi IMAMURA ,  Yuiko EHASHI ,  Hiroi YAMAGUCHI

IPC: C21D8/12 ,  C21D9/46 ,  C22C38/60 ,  H01F1/147

Abstract: Excellent magnetic properties can be stably obtained in grain-oriented electrical steel sheets produced from thin slabs without using inhibitor forming components. Provided is a method for producing a grain-oriented electrical steel sheet comprising: subjecting a molten steel to continuous casting to form a slab with 25-100 mm in thickness, the molten steel having a chemical composition containing, in mass %, C: 0.002-0.100%, Si: 2.00-8.00% and Mn: 0.005-1.000%, Al:

公开(公告)号：US20180066346A1

公开(公告)日：2018-03-08

申请号：US15554051

申请日：2016-03-04

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Masanori TAKENAKA ,  Yuiko WAKISAKA

IPC: C22C38/60 ,  C21D8/12 ,  C21D9/46 ,  C21D6/00 ,  C22C38/04 ,  C22C38/02 ,  C22C38/12 ,  C22C38/16 ,  C22C38/00 ,  H01F1/16

Abstract: Provided are a grain-oriented electrical steel sheet with low iron loss even when including at least one grain boundary segregation element among Sb, Sn, Mo, Cu, and P, and a method for manufacturing the same. In our method, Pr is controlled to satisfy Pr≦−0.075T+18, where T>10, 5

公开(公告)号：US20170088915A1

公开(公告)日：2017-03-30

申请号：US15310904

申请日：2015-05-11

Applicant: JFE STEEL CORPORATION

Inventor： Ryuichi SUEHIRO ,  Takashi TERASHIMA ,  Makoto WATANABE ,  Toshito TAKAMIYA ,  Takeshi IMAMURA

IPC: C21D9/46 ,  C21D3/04 ,  C22C38/60 ,  C22C38/34 ,  C22C38/32 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F41/02 ,  H01F1/03 ,  C21D8/12

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60 ,  H01F1/0306 ,  H01F1/16 ,  H01F41/0233

Abstract: A method for producing a grain-oriented electrical steel sheet by subjecting a slab of an inhibitor-less ingredient system containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.010-0.8 mass % and extremely decreased Al, N, Se and S to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within range of 700-800° C. in a heating process of decarburization annealing is T1 and a certain temperature as a soaking temperature within a range of 820-900° C. is T2, a heating rate R1 between 500° C. and T1 is set to not less than 100° C./s and heating rate R2 between T1 and T2 is set to not more than 15° C./s, whereby grain-oriented electrical steel sheet having excellent iron loss property and coating peeling resistance is obtained in the inhibitor-less ingredient system while ensuring decarburization property even when rapid heating is performed during decarburization annealing.

公开(公告)号：US20250163529A1

公开(公告)日：2025-05-22

申请号：US18837692

申请日：2023-02-10

Applicant: JFE Steel Corporation

Inventor： Masanori TAKENAKA ,  Takeshi IMAMURA ,  Takaaki TANAKA

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/40 ,  C22C38/60 ,  H01F1/147

Abstract: A method for producing a grain-oriented electrical steel sheet is disclosed, including heating a steel slab containing an inhibitor-forming ingredient; hot rolling the steel slab; performing hot-band annealing as appropriate; performing cold rolling; performing primary recrystallization annealing that serves as decarburization annealing; applying an annealing separator; and performing finishing annealing. Specifically, the step of heating the steel slab includes heating the steel slab to a temperature of 900 to 1300° C., performing width reduction thereon of 50 to 200 mm on each side, performing horizontal rolling thereon, and heating the steel slab again. The average temperature rise rate of the steel sheet in the width direction in the temperature range of 700 to 900° C. during a heating process of the first annealing performed on the steel sheet after the hot rolling is controlled to satisfy a particular inequality.

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：US20240254601A1

公开(公告)日：2024-08-01

申请号：US18561064

申请日：2022-05-27

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Ayaka YOSHIKAWA ,  Masanori TAKENAKA ,  Kazuaki TAMURA

IPC: C22C38/02 ,  C21D3/04 ,  C21D6/00 ,  C21D8/12 ,  C22C38/04 ,  C22C38/60 ,  C23G1/08

CPC classification number: C22C38/02 ,  C21D3/04 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/04 ,  C22C38/60 ,  C23G1/08

Abstract: Disclosed is a method for producing a grain-oriented electrical steel sheet, including subjecting a steel material containing, by mass %, Si: 2.0-5.0%, Mn: 0.01-0.50%, and one or both of S and Se: 0.001-0.100% in total, to hot rolling, followed by cold rolling once, or twice or more with intermediate annealing in between, followed by decarburization annealing, followed by application and drying of an annealing separator mainly composed of MgO, followed by final annealing, followed by flattening annealing, in which the final annealing is performed in a predetermined atmosphere, the flattening annealing is accompanied by coating treatment including application of a coating solution, and prior to the application of the coating solution, pickling treatment is performed using an acid with a predetermined concentration at a temperature of 15° C. or higher for 1 second or more and 60 seconds or less.

公开(公告)号：US20190323100A1

公开(公告)日：2019-10-24

申请号：US16344441

申请日：2017-11-01

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Yuiko EHASHI ,  Masanori TAKENAKA ,  Hiroi YAMAGUCHI

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C21D1/42 ,  C22C38/60 ,  C22C38/48 ,  C22C38/46 ,  C22C38/16 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F1/147

Abstract: Excellent magnetic properties can be stably obtained in grain-oriented electrical steel sheets produced from thin slabs without using inhibitor forming components. Provided is a method for producing a grain-oriented electrical steel sheet comprising: subjecting a molten steel to continuous casting to form a slab with 25 to 100 mm in thickness, the molten steel having a chemical composition containing, in mass %, C: 0.002 to 0.100%, Si: 2.00 to 8.00%, Mn: 0.005 to 1.000%, Al:

公开(公告)号：US20190247902A1

公开(公告)日：2019-08-15

申请号：US16342015

申请日：2017-10-18

Applicant: JFE STEEL CORPORATION

Inventor： Yuiko EHASHI ,  Masanori TAKENAKA ,  Takeshi IMAMURA ,  Minoru TAKASHIMA

IPC: B21B45/08 ,  C22C38/60 ,  C22C38/40 ,  C22C38/34 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00

CPC classification number: B21B45/08 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1222 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60

Abstract: With a hot-rolled steel sheet for electrical steel sheet production having a scale layer on the surface, where the surface of the steel sheet has a lightness L* as defined in JIS Z 8781-4: 2013 satisfying 30≤L*≤50, and chromaticities a* and b* as defined in JIS Z 8781-4: 2013 satisfying −1≤a*≤2 and −5≤b*≤3 respectively, and with one end portion in the longitudinal direction of a coil as a reference, a color difference ΔEab* as defined in JIS Z 8781-4: 2013 at the central portion and at the opposite end portion satisfies ΔEab*≤8, it is possible to obtain a grain-oriented electrical steel sheet where the variation of properties in a product coil is small.

公开(公告)号：US20190055619A1

公开(公告)日：2019-02-21

申请号：US16079669

申请日：2017-03-07

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi IMAMURA ,  Minoru TAKASHIMA ,  Yuiko EHASHI ,  Yasuyuki HAYAKAWA

IPC: C21D9/46 ,  C21D8/02 ,  C21D8/12 ,  C21D6/00 ,  C22C38/60 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00

Abstract: To provide a grain-oriented electrical steel sheet that has better magnetic property than conventional ones, in hot band annealing of the hot rolled steel sheet obtained by a predetermined step, an average heating rate from ordinary temperature to 400° C. is set to 50° C./s or more, and a time to reach 900° C. from 400° C. is set to 100 sec or less.

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.