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：US20150357101A1

公开(公告)日：2015-12-10

申请号：US14761538

申请日：2013-11-21

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Yoshihiko ODA ,  Hiroaki TODA ,  Kazuhiro HANAZAWA

IPC: H01F1/147 ,  C21D6/00 ,  C22C38/02 ,  H01F41/02 ,  C22C38/06 ,  C22C38/00 ,  C22C38/60 ,  H01F1/16 ,  C21D8/12 ,  C22C38/04

CPC classification number: H01F1/14775 ,  C21D6/005 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1261 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  H01F1/16 ,  H01F41/02

Abstract: A steel slab having a chemical composition including C: not more than 0.005 mass %, Si: not more than 4 mass %, Mn: 0.03-2 mass %, P: not more than 0.2 mass %, S: not more than 0.004 mass %, Al: not more than 2 mass %, N: not more than 0.004 mass %, Se: not more than 0.0010 mass % and the balance being Fe and inevitable impurities is subjected to hot rolling, cold rolling and recrystallization annealing up to 740° C. at an average heating rate of not less than 100° C./s to produce a semi-processed non-oriented electrical steel sheet being high in the magnetic flux density and low in the iron loss after stress relief annealing.

Abstract translation: 具有C：0.005质量％以下，Si：4质量％以下，Mn：0.03〜2质量％，P：0.2质量％以下，S：0.004质量％以下的化学组成的钢坯 ％，Al：不大于2质量％，N：不大于0.004质量％，Se：不大于0.0010质量％，余量为Fe和不可避免的杂质，进行热轧，冷轧和再结晶退火至740 ℃，平均加热速度不低于100℃/秒，以产生磁通密度高的半加工无取向电工钢板，并且消除应力退火后的铁损低。

公开(公告)号：US20250066886A1

公开(公告)日：2025-02-27

申请号：US18723629

申请日：2022-12-14

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Yukino MIYAMOTO ,  Yoshihiko ODA ,  Tomoyuki OKUBO ,  Souichiro YOSHIZAKI

IPC: C22C38/02 ,  C22C38/00 ,  C22C38/10 ,  C22C38/60

Abstract: Low iron loss and high magnetic flux density in a Si-gradient magnetic material are achieved. A non-oriented electrical steel sheet is a multilayer electrical steel sheet comprising an inner layer and a surface layer located on each of both sides of the inner layer, wherein the surface layer and the inner layer have specific chemical compositions, ΔSi defined as a difference in Si content between the surface layer and the inner layer is 0.5 mass % to 3.3 mass %, a ratio t1/t of a total thickness t1 of both surface layers to a sheet thickness t is 0.08 to 0.73, a ratio B50/Bs is 0.825 or more, and iron loss W10/10k and the sheet thickness t satisfy W10/10k≤25+6900×t.

公开(公告)号：US20230257860A1

公开(公告)日：2023-08-17

申请号：US18296997

申请日：2023-04-07

Applicant: JFE STEEL CORPORATION

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

IPC: C22C38/10 ,  C21D8/12 ,  C21D9/46 ,  C21D9/68 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08

CPC classification number: C22C38/105 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D9/46 ,  C21D9/68 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/005 ,  C22C38/06 ,  C22C38/008 ,  C22C38/08

Abstract: Provided is a method of easily producing a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising hot rolling a slab having a specified chemical composition to obtain a hot-rolled sheet; coiling the hot-rolled sheet; cold rolling the hot-rolled sheet once or twice with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet; and subjecting the cold-rolled sheet to final annealing, wherein the hot-rolled sheet after the hot rolling is cooled at an average cooling rate from 800° C. to 650° C. of 30° C./s or more, and thereafter the coiling is performed at 650° C. or less.

公开(公告)号：US20220393520A1

公开(公告)日：2022-12-08

申请号：US17756833

申请日：2020-11-18

Applicant: JFE STEEL CORPORATION

Inventor： Takaaki TANAKA ,  Tomoyuki OKUBO ,  Yoshihiko ODA

IPC: H02K1/02 ,  C22C38/06 ,  C22C38/00 ,  C22C38/02 ,  C21D8/12 ,  C21D9/46 ,  H01F1/147 ,  H01F3/02

Abstract: Provided are a motor core having excellent fatigue resistance and a method of manufacturing the motor core at a low cost. The motor core that is an electrical-steel-sheet-stacked body has an outer peripheral surface in which an appearance ratio of recrystallized grains with a grain size of 15 μm or less is 70% or more of a sheet thickness of the motor core.

公开(公告)号：US20210388456A1

公开(公告)日：2021-12-16

申请号：US17281614

申请日：2019-07-04

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Tomoyuki OKUBO ,  Yoshihiko ODA ,  Yukino MIYAMOTO

IPC: C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/60 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/34 ,  C22C38/28 ,  C22C38/26 ,  C22C38/20 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F1/147

Abstract: A non-oriented electrical steel sheet is produced by subjecting a steel slab containing, in mass %, C: not more than 0.0050%, Si: 1.0 to 6.5%, Mn: 0.05 to 2.0%, S: not more than 0.0050%, Al: not more than 0.01%, N: not more than 0.0050%, Ti: not more than 0.0030%, Nb: not more than 0.0030% and O: not more than 0.0050% to a hot rolling, a cold rolling and a finish annealing, the finish annealing conducted under conditions that a soaking temperature T (° C.) satisfies the following equation (1): ( 8 ⁢ 0 ⁢ 0 ⁢ 0 + 400 × Si ⁡ ( mass ⁢ ⁢ % ) ) { ( - log ⁡ ( Al ⁡ ( mass ⁢ ⁢ % ) × N ⁡ ( mass ⁢ ⁢ % ) ) + 1.7 + 0.2 × Si ⁡ ( mass ⁢ ⁢ % ) } - 2 ⁢ 7 ⁢ 3 . 1 ⁢ 5 ≤ T ≤ 1200 , ( 1 ) and an atmosphere in the finish annealing is a mixed gas composed of one or more selected from nitrogen, hydrogen and noble gas with a nitrogen content of not more than 50 vol % and a dew point of not higher than −20° C., whereby a non-oriented electrical steel sheet achieving a high magnetic flux density and a low iron loss is produced.

公开(公告)号：US20210332464A1

公开(公告)日：2021-10-28

申请号：US17055601

申请日：2019-05-20

Applicant: JFE STEEL CORPORATION

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

IPC: C22C38/10 ,  C21D8/12 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/08 ,  C21D9/68

Abstract: Provided is a non-oriented electrical steel sheet that contains substantially no Al and contains large amounts of Si and Mn and has low iron loss, comprising a chemical composition containing C: 0.0050% or less, Si: 2.0% or more and 6.0% or less, Mn: 1.0% or more and 3.0% or less, P: 0.20% or less, S: 0.0050% or less, N: 0.0050% or less, Al: 0.0050% or less, and one or more selected from B: 0.0001% or more and 0.0050% or less, Nb: 0.0001% or more and 0.0050% or less, and V: 0.0005% or more and 0.0500% or less, with a balance consisting of Fe and inevitable impurities, wherein a number density of Si—Mn nitrides with an average diameter of 50 nm or more and 500 nm or less is 1 or less per μm3.

公开(公告)号：US20210134500A1

公开(公告)日：2021-05-06

申请号：US16770947

申请日：2018-12-10

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihiko ODA ,  Yoshiaki ZAIZEN ,  Tatsuhiko HIRATANI

IPC: H01F1/147 ,  B32B15/01 ,  C22C38/14 ,  C22C38/02 ,  C22C38/60 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00

Abstract: Provided is a multilayer electrical steel sheet having low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and inner layer have predetermined chemical compositions, the multilayer electrical steel sheet having: ΔSi of 0.5 mass % or more, ΔSi being defined as a difference between a Si content in the surface layer [Si]1 and a Si content in the inner layer [Si]0 represented by [Si]1−[Si]0; Δλ1.0/400 of 1.0×10−6 or less, Δλ1.0/400 being defined as an absolute value of the difference between a magnetostriction of the surface layer λ1.0/400,1 and a magnetostriction of the inner layer λ1.0/400,0; a sheet thickness t of 0.03 mm to 0.3 mm, and a ratio of a total thickness of the surface layers t1 to t of from 0.10 to 0.70.