公开(公告)号：US20170081740A1

公开(公告)日：2017-03-23

申请号：US15311026

申请日：2015-05-11

Applicant: JFE STEEL CORPORATION

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

IPC: C21D9/46 ,  C21D3/04 ,  C22C38/60 ,  C22C38/34 ,  C22C38/26 ,  H01F1/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C22C38/16

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  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 ,  C22C38/26 ,  C22C38/34 ,  C22C38/60 ,  H01F1/16 ,  H01F3/02

Abstract: In a method for producing a grain-oriented electrical steel sheet by subjecting a slab containing C: 0.002-0.10 mass %, Si: 2.5-6.0 mass %, Mn: 0.01-0.8 mass % and further containing Al and N, or S and/or Se, or Al, N, S and/or Se as inhibitor ingredients to hot rolling, hot band annealing, cold rolling, decarburization annealing, application of an annealing separator and finish annealing, when a certain temperature within a range of 700-800° C. in a heating process of the 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 80° C./s and a heating rate R2 between T1 and T2 is set to not more than 15° C./s, whereby a grain-oriented electrical steel sheet having excellent magnetic properties and peeling resistance of forsterite coating is obtained while ensuring decarburization property.

公开(公告)号：US20250101541A1

公开(公告)日：2025-03-27

申请号：US18728216

申请日：2023-01-24

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Hayato SAITO ,  Ryuichi SUEHIRO ,  Masayasu UENO ,  Shinya YAMAGUCHI

IPC: C21D9/46 ,  B22D11/00 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  H01F1/147

Abstract: Ridging caused when handling steel containing a large amount of alloying elements such as Si and Al in a low-speed hot rolling process is suppressed. A method of producing a hot-rolled steel sheet for a non-oriented electrical steel sheet comprises: producing a steel slab having a certain chemical composition and a thickness of 50 mm to 200 mm by continuous casting; conveying the steel slab to a hot rolling line while maintaining a surface temperature of the steel slab at 800° C. or more; and performing hot rolling in which the steel slab is sequentially subjected to rough rolling, reheating treatment, and finish rolling in the hot rolling line to obtain a hot-rolled steel sheet, wherein the hot rolling is performed under specific conditions.

公开(公告)号：US20240410037A1

公开(公告)日：2024-12-12

申请号：US18698972

申请日：2022-11-10

Applicant: JFE STEEL CORPORATION

Inventor： Ryuichi SUEHIRO ,  Tomoyuki OKUBO ,  Masayasu UENO ,  Shinya YAMAGUCHI ,  Shigehiro MARUYAMA

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

Abstract: In a process using a thin slab, ridging is suppressed. A method of producing a hot-rolled steel sheet for a non-oriented electrical steel sheet includes: continuous casting producing a steel slab having a defined chemical composition and a thickness of 50 mm to 200 mm; transferring the steel slab to a furnace while maintaining a surface temperature of the steel slab at 800° C. or more; holding the steel slab in the furnace under conditions including a hold temperature of 1100° C. to 1300° C. and a hold time of 60 s or more; and a hot rolling process under conditions of (1) and (2) of rough rolling, reheating treatment, and finish rolling in sequence to obtain a hot-rolled steel sheet: (1) total rolling reduction of the rough rolling: 80% or more, and (2) total rolling reduction of the finish rolling: 80% or more.

公开(公告)号：US20180371620A1

公开(公告)日：2018-12-27

申请号：US16117369

申请日：2018-08-30

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Makoto WATANABE ,  Masanori UESAKA ,  Ryuichi SUEHIRO ,  Toshito TAKAMIYA

IPC: C23C22/12 ,  C21D6/00 ,  C21D9/46 ,  C23C22/22 ,  H01F1/18 ,  C23C22/74 ,  C23C22/18 ,  C21D8/12 ,  C23C22/78 ,  C23C22/20

Abstract: Provided is a treatment solution for chromium-free tension coating that can simultaneously achieve excellent moisture absorption resistance and a high iron loss reduction effect obtained by imparting sufficient tension, by using an inexpensive Ti source instead of expensive Ti chelate. The treatment solution for chromium-free tension coating contains: one or more of phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in an amount of 50 parts by mass to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of SiO2; Ti source in an amount of 30 parts by mass to 50 parts by mass per 100 parts by mass of the phosphate in terms of solid content of TiO2; and H3PO4, and the number of moles of metallic elements in the phosphate and of phosphorus in the treatment solution satisfy: 0.20≤([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P]≤0.45  (1).

公开(公告)号：US20180230565A1

公开(公告)日：2018-08-16

申请号：US15750264

申请日：2016-09-21

Applicant: JFE STEEL CORPORATION

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

IPC: C21D8/12 ,  C23C22/33 ,  C21D9/46 ,  H01F1/18

CPC classification number: C21D8/1283 ,  C21D8/1288 ,  C21D9/46 ,  C23C22/00 ,  C23C22/33 ,  H01F1/16 ,  H01F1/18

Abstract: A grain-oriented electrical steel sheet has a coating on a surface thereof. The coating has a composite elastic modulus of 60 GPa to 95 GPa and a film thickness of 1.0 μm or more, and a tension applied to the grain-oriented electrical steel sheet by the coating is 6.0 MPa or more, and an amount of iron loss degradation between before and after roll reduction when the grain-oriented electrical steel sheet is roll-reduced at a linear pressure of 68.6 N/cm is 0.010 W/kg or less in W17/50.

公开(公告)号：US20180017868A1

公开(公告)日：2018-01-18

申请号：US15548836

申请日：2016-02-01

Applicant: JFE STEEL CORPORATION

Inventor： Ryuichi SUEHIRO ,  Takashi TERASHIMA

IPC: G03F7/039 ,  C21D6/00 ,  G03F7/022 ,  C25F3/06 ,  C22C38/06 ,  G03F7/20 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  G03F7/32 ,  C22C38/04

CPC classification number: G03F7/039 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1277 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25F3/06 ,  G03F7/022 ,  G03F7/023 ,  G03F7/027 ,  G03F7/031 ,  G03F7/033 ,  G03F7/038 ,  G03F7/20 ,  G03F7/325 ,  G03F7/40 ,  H01F1/16

Abstract: Provided is a manufacturing method for a grain-oriented electrical steel sheet with which it is possible to achieve both good iron loss and high productivity. In groove formation for magnetic domain refinement, a resist containing a photosensitive resin is applied, photoexposed, and developed to form an exposed steel substrate portion having a linear shape. Subsequently, electrolytic etching is performed at current density ρ=I/S of 7.5 A/cm2 or more with respect to the exposed steel substrate portion, where I represents current supplied to an electrode and S represents surface area of the exposed steel substrate portion in a steel sheet surface of equal surface area to the electrode.

公开(公告)号：US20230234116A1

公开(公告)日：2023-07-27

申请号：US17998807

申请日：2021-05-19

Applicant: JFE STEEL CORPORATION

Inventor： Ryuichi SUEHIRO ,  Naoki WATANABE ,  Ryosuke WATANABE

IPC: B21C47/14 ,  B21C47/04 ,  B65H23/195 ,  C21D8/02 ,  C21D9/46

CPC classification number: B21C47/146 ,  B21C47/045 ,  B65H23/195 ,  C21D8/0242 ,  C21D9/46

Abstract: Provided are methods that can prevent either or both of kinking and collapsing of a steel sheet coiled in coil form regardless of the characteristics of the steel sheet. A method of determining a tension pattern of tension applied to a steel sheet to coil the steel sheet in coil form comprises calculating the tension pattern using an apparent elastic modulus in a radial direction of a coil.

公开(公告)号：US20230212703A1

公开(公告)日：2023-07-06

申请号：US17997044

申请日：2021-03-26

Applicant: JFE STEEL CORPORATION

Inventor： Ryuichi SUEHIRO ,  Takeshi OMURA ,  Shigehiro TAKAJO ,  Yoshihisa ICHIHARA

IPC: C21D8/12 ,  C21D9/46 ,  C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  B23K26/364 ,  B23K26/402 ,  H01F1/16

CPC classification number: C21D8/1277 ,  C21D9/46 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/001 ,  C22C38/002 ,  B23K26/364 ,  B23K26/402 ,  H01F1/16 ,  C22C2202/02

Abstract: To form linear grooves of desired groove width on a metal strip surface and provide a grain-oriented electrical steel sheet having excellent magnetic properties, a linear groove formation method comprises: forming a resist coating on at least one surface of a metal strip; thereafter irradiating the resist coating with a laser while scanning the laser in a direction crossing a rolling direction of the metal strip, to remove the resist coating in a part irradiated with the laser; and thereafter performing etching treatment to form a linear groove in a part of the metal strip in which the resist coating is removed, wherein the resist coating contains a predetermined amount of an inorganic compound, and on the surface of the metal strip, the laser has a predetermined elliptic beam shape.

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：US20160305026A1

公开(公告)日：2016-10-20

申请号：US15038501

申请日：2015-01-14

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Makoto WATANABE ,  Masanori UESAKA ,  Ryuichi SUEHIRO ,  Toshito TAKAMIYA

IPC: C23C22/12 ,  C21D9/46 ,  C21D6/00 ,  C23C22/78 ,  C23C22/18 ,  C23C22/20 ,  C23C22/22 ,  H01F1/18 ,  C23C22/74

CPC classification number: C23C22/12 ,  C21D6/008 ,  C21D8/1288 ,  C21D9/46 ,  C23C22/182 ,  C23C22/188 ,  C23C22/20 ,  C23C22/22 ,  C23C22/74 ,  C23C22/78 ,  H01F1/18

Abstract: Provided is a treatment solution for chromium-free tension coating that can simultaneously achieve excellent moisture absorption resistance and a high iron loss reduction effect obtained by imparting sufficient tension, by using an inexpensive Ti source instead of expensive Ti chelate. The treatment solution for chromium-free tension coating contains: one or more of phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in an amount of 50 parts by mass to 120 parts by mass per 100 parts by mass of the phosphate in terms of solid content of Ti source in an amount of 30 parts by mass to 50 parts by mass per 100 parts by mass of the phosphate in terms of solid content of TiO2; and H3PO4, and the number of moles of metallic elements in the phosphate and of phosphorus in the treatment solution satisfy: 0.20≦[Mg]+[Ca+[Ba]+Sr]+[Zn]+[Mn]+1.5[Al])/[P]≦0.45  (1).