公开(公告)号：US20240301525A1

公开(公告)日：2024-09-12

申请号：US18662318

申请日：2024-05-13

Applicant: JFE Steel Corporation

Inventor： Takaaki TANAKA ,  Tomoyuki OKUBO

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/34 ,  C22C38/60 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1277 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/34 ,  C22C38/60 ,  H01F1/14791 ,  C22C2202/02

Abstract: A non-oriented electrical steel sheet includes, by mass %, C: 0.010% or less, Si: 1.0% or more and 5.0% or less, Mn: 0.05% or more and 5.0% or less, P: 0.1% or less, S: 0.01% or less, Al: 3.0% or less, N: 0.005% or less, and the balance being Fe and inevitable impurities, wherein an average crystal grain size is 50 μm or less, and a sum SA of area ratios of crystal grains with oriented in a rolling direction or a direction perpendicular to the rolling direction and a sum SB of area ratios of crystal grains with oriented in the rolling direction or the direction perpendicular to the rolling direction satisfy SA−SB≥0.

公开(公告)号：US20220372600A1

公开(公告)日：2022-11-24

申请号：US17770709

申请日：2020-10-12

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Nobuko NAKAGAWA ,  Yoshihiko ODA ,  Tomoyuki OKUBO ,  Chiyoko TADA

IPC: C22C38/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12 ,  C21D9/46 ,  C21D8/02

Abstract: A non-oriented electrical steel sheet produced by hot-rolling a steel slab containing Si: 2.8 to 6.5 mass % and Zn: 0.0005 to 0.0050 mass % followed by cold rolling and finish annealing, a coating agent containing at least one element from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi is applied to the surface after annealing forming an insulation coating with nitriding-suppressing ability. Alternatively, an intermediate layer containing at least one element from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi and having a nitriding-suppressing ability forms on the steel sheet iron matrix after the annealing and forms an insulation coating, without above elements, on the intermediate layer thus obtaining a non-oriented electrical steel sheet wherein a high strength rotor core with and stator core with excellent magnetic is simultaneously obtained, and a motor core including a stator core and rotor core from the steel sheet.
In a production of a non-oriented electrical steel sheet by hot-rolling a steel slab containing Si: 2.8 to 6.5 mass % and Zn: 0.0005 to 0.0050 mass % followed by cold rolling and finish annealing, a coating agent containing at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi is applied to the steel sheet surface after the finish annealing to form an insulation coating with a nitriding-suppressing ability. Alternatively, an intermediate layer containing at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi and having a nitriding-suppressing ability is formed on the steel sheet iron matrix after the finish annealing and form an insulation coating not containing above elements is formed on the intermediate layer thus to obtain a non-oriented electrical steel sheet from which a rotor core with high strength and stator core with excellent magnetic properties after the stress-relief annealing can be obtained at the same time, and a motor core comprising a stator core and rotor core is produced from the steel sheet.

公开(公告)号：US20190333662A1

公开(公告)日：2019-10-31

申请号：US16474646

申请日：2017-11-17

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Makoto WATANABE ,  Toshito TAKAMIYA ,  Tomoyuki OKUBO

IPC: H01F1/147 ,  C23G1/08 ,  C23C22/78 ,  H01F27/34

Abstract: A grain-oriented electrical steel sheet having an insulating film disposed on a surface thereon. The insulating film having a chemical composition comprising Si, P, O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, Mn, and Co. The insulating film has a crystallinity in a range of 20% or more, and a minimum tension provided to the steel sheet by the insulating film at a temperature in a range of 100° C. to 200° C. is 10 MPa or more.

公开(公告)号：US20180202021A1

公开(公告)日：2018-07-19

申请号：US15743776

申请日：2016-08-25

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihiko ODA ,  Tadashi NAKANISHI ,  Tomoyuki OKUBO ,  Yoshiaki ZAIZEN ,  Hiroaki NAKAJIMA

IPC: C21D9/46 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C2202/02 ,  H01F1/14775 ,  H01F1/16 ,  H02K1/02

Abstract: Iron loss is reduced by increasing magnetic flux density. A non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, and O: 0.0200% or less, with the balance consisting of Fe and inevitable impurities, in which the steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 μm or more and 200 μm or less, a Vickers hardness of 140 HV or more and 230 HV or less.

公开(公告)号：US20220010400A1

公开(公告)日：2022-01-13

申请号：US17295875

申请日：2019-11-25

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Masanori UESAKA ,  Yoshiaki ZAIZEN ,  Yoshihiko ODA

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C21D1/26 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  H01F1/147 ,  H01F41/02

Abstract: To stably improve the magnetic flux density by utilizing induction heating and radiant heating during final annealing of a non-oriented electrical steel sheet. A method of manufacturing a non-oriented electrical steel sheet, including subjecting a slab having a predetermined chemical composition to hot rolling with or without performing hot-rolled sheet annealing, and then to cold rolling either once, or twice or more with intermediate annealing performed therebetween, and then to final annealing, where a material before final cold rolling has a recrystallization ratio of less than 80% and a {100} intensity of 8 or less in a ¼ layer, and in the final annealing, an average heating rate from 600° C. to 720° C. is 50° C./s or higher, and an average heating rate from 720° C. to 760° C. is 5° C./s or higher.

公开(公告)号：US20210159002A1

公开(公告)日：2021-05-27

申请号：US16617262

申请日：2018-05-08

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Yoshiaki ZAIZEN ,  Masanori UESAKA ,  Yoshihiko ODA

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

Abstract: A non-oriented electrical steel sheet produced by hot rolling a steel slab containing, by mass %, C: not more than 0.0050, Si: 3.2 to 4.5%, Mn: 0.1 to 2.0%, P: not more than 0.020%, As: not more than 0.0030%, Sn+Sb: 0.005 to 0.10%, and one or two elements selected from Mo and W by a content ranging from 0.0020 to 0.10% in total, subjecting the resultant steel sheet to one cold rolling or two or more cold rollings including an intermediate annealing therebetween to achieve a final sheet thickness, and then subjecting the cold rolled sheet to finish annealing, a N2 content in an atmosphere in the finish annealing is set to not more than 20 vol %, and average strain rate in the first pass is set to not more than 4/sec, allowing the cold rolling property to improve with no degradation in magnetic property and no decrease in productivity.

公开(公告)号：US20190244735A1

公开(公告)日：2019-08-08

申请号：US16343847

申请日：2017-08-30

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihiko ODA ,  Tomoyuki OKUBO ,  Yoshiaki ZAIZEN ,  Masanori UESAKA ,  Tatsuhiko HIRATANI

IPC: H01F1/147 ,  C21D8/12 ,  C22C38/02 ,  C22C38/04

CPC classification number: H01F1/14775 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  H01F1/147

Abstract: Iron loss is reduced by increasing magnetic flux density. Disclosed is a non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and Ca: 0.0010% or more and 0.0050% or less, with the balance being Fe and inevitable impurities, in which the non-oriented electrical steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 μm or more and 200 μm or less, and a Vickers hardness of 140 HV or more and 230 HV or less.

公开(公告)号：US20180327883A1

公开(公告)日：2018-11-15

申请号：US15775848

申请日：2016-10-03

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Tomoyuki OKUBO ,  Yoshihiko ODA

IPC: C21D9/46 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/34 ,  C22C38/06 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00

CPC classification number: C21D9/46 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1233 ,  C21D8/1272 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/34 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C22C2202/02 ,  Y02P10/253

Abstract: A method for producing a non-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: not more than 0.0050 mass %, Si: not more than 4.0 mass %, Mn: 0.03-3.0 mass %, P: not more than 0.1 mass %, Se: not more than 0.0010 mass %, Al: not more than 3.0 mass %, Ni: not more than 3.0 mass %, Cr: not more than 5.0 mass %, Ti: not more than 0.003 mass %, and Nb: not more than 0.003 mass % and subjecting the sheet to hot band annealing if necessary, a cold rolling, and further a finish annealing, wherein the heating in the finish annealing is conducted in two stages of performing induction heating and subsequently a radiation heating and a zone from 600° C. to 740° C. in the induction heating is heated at an average heating rate of not less than 50° C./sec, whereby a high magnetic flux density can be obtained stably.

公开(公告)号：US20170211161A1

公开(公告)日：2017-07-27

申请号：US15500435

申请日：2015-08-13

Applicant: JFE STEEL CORPORATION

Inventor： Tadashi NAKANISHI ,  Hiroaki NAKAJIMA ,  Tomoyuki OKUBO ,  Yoshihiko ODA

IPC: C21D8/12 ,  C22C38/60 ,  C22C38/06 ,  H01F1/147 ,  C22C38/00 ,  C22C38/16 ,  C22C38/02 ,  C21D6/00 ,  C22C38/04

Abstract: A non-oriented electrical steel sheet with excellent recyclability whose magnetic property is prevented from becoming unstable in the case of reducing the Al content in order to reuse the non-oriented electrical steel sheet as iron scrap is provided. The non-oriented electrical steel sheet has a chemical composition containing, in mass %: C: 0.0050% or less; Si: 1.0% or more and 4.0% or less; Mn: 0.10% or more and 3.0% or less; Sol. Al: less than 0.0050%; P: more than 0.01% and 0.20% or less; S: 0.0050% or less; N: 0.0050% or less; Cu: 0.02% or more and less than 0.10%; and Ca: 0.0005% or more and 0.0100% or less, with a balance being Fe and incidental impurities.

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.