公开(公告)号：US20220290287A1

公开(公告)日：2022-09-15

申请号：US17754146

申请日：2020-09-17

Applicant: JFE STEEL CORPORATION

Inventor： Yukino MIYAMOTO ,  Yoshiaki ZAIZEN ,  Yoshihiko ODA

IPC: C23C10/08 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C10/60 ,  C21D9/46 ,  C21D6/00 ,  H01F1/147

Abstract: Disclosed is a non-oriented electrical steel sheet having low iron loss in a frequency range of about 400 Hz. The non-oriented electrical steel sheet comprises an inner layer and surface layers, wherein the inner layer and surface layers have specific chemical compositions, each of the surface layers has an in-plane tensile stress of 5 MPa to 50 MPa, the non-oriented electrical steel sheet has a sheet thickness t of 0.01 mm to 0.35 mm, the surface layers have a total thickness t1 with a ratio t1/t of the total thickness t1 to the sheet thickness t being 0.10 to 0.70, the non-oriented electrical steel sheet has an average N content [N] in the total sheet thickness of 40 ppm or less, and an iron loss W10/400 and the sheet thickness t satisfy the following formula (1): W10/400≤8+30t  (1).

公开(公告)号：US20210371948A1

公开(公告)日：2021-12-02

申请号：US17281617

申请日：2019-07-16

Applicant: JFE STEEL CORPORATION

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

IPC: C21D9/46 ,  B32B15/01 ,  C21D8/12 ,  C21D6/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/60 ,  H01F1/147

Abstract: A non-oriented electrical steel sheet with an average magnetostriction λp-p at 400 Hz and 1.0 T of not more than 4.5×10−6, and area ratio of recrystallized grains at a section in rolling direction of steel sheet of 40 to 95% and an average grain size of 10 to 40 μm is obtained by subjecting a steel slab containing, in mass %, C: not more than 0.005%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Al: not more than 3.0%, P: not more than 0.20%, S: not more than 0.005%, N: not more than 0.005%, Ti: not more than 0.003%, V: not more than 0.005% and Nb: not more than 0.005% and satisfying Si-2Al-Mn≥0 to hot rolling, hot-band annealing, cold rolling and finish annealing under adequate cold rolling and finish annealing conditions, and a motor core is manufactured by such a steel sheet.

公开(公告)号：US20190382867A1

公开(公告)日：2019-12-19

申请号：US16486121

申请日：2018-02-07

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Yoshihiko ODA ,  Tomoyuki OKUBO

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/20 ,  C22C38/06 ,  C22C38/34 ,  C22C38/04 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147 ,  H02K1/02

Abstract: There are provided a method for producing a non-oriented electrical steel sheet, a method for manufacturing a motor core from such a steel sheet, and a motor core. In the production of a non-oriented electrical steel sheet by subjecting a steel slab containing given amounts of C, Si, Mn, P, S, Al, N, Ti, Nb and V, provided that Si, Al and Mn satisfy Si-2Al-Mn≥0, to hot rolling, cold rolling, finish annealing and stress relief annealing, conditions of the finish annealing and stress relief annealing are adjusted such that a yield stress after the finish annealing is not less than 400 MPa and iron loss W10/400 (W/kg) after the stress relief annealing in relation to a sheet thickness t (mm) satisfies W10/400≤10+25t and magnetostriction λo-p (bake) after the stress relief annealing is not more than 5.0×10−6 and a ratio (λo-p (bake)/λo-p (green)) of magnetostriction λo-p (bake) after the stress relief annealing to magnetostriction λo-p (green) before the stress relief annealing is less than 0.8, whereby a high-strength rotor core and a stator core having excellent magnetic properties after stress relief annealing can be obtained from the same steel material.

公开(公告)号：US20180030558A1

公开(公告)日：2018-02-01

申请号：US15552755

申请日：2015-12-11

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Kohei KURIHARA ,  Yoshihiko ODA ,  Hiroaki NAKAJIMA

IPC: C21D8/12 ,  H01F1/16 ,  C22C38/58 ,  C22C38/60 ,  C21D9/46 ,  C22C38/00

CPC classification number: C21D8/12 ,  C21D1/34 ,  C21D1/42 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C22C38/60 ,  H01F1/14775 ,  H01F1/16

Abstract: In the production of a non-oriented electrical stress sheet by hot rolling a steel slab containing, by mass %, C: not more than 0.005%, Si: not more than 8.0%, Mn: 0.03-3.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3.0%, N: not more than 0.005%, Ni: not more than 3%, Cr: not more than 5%, Ti: not more than 0.005%, Nb: not more than 0.003%, As: not more than 0.005% and O: not more than 0.005%, subjecting to one cold rolling or two or more cold rollings interposing an intermediate annealing therebetween after conducting a hot band annealing or without conducting a hot band annealing and subjecting to a finish annealing, an average heating rate from 600° C. to 700° C. during the heating process in the finish annealing is set to not less than 50° C./sec.

公开(公告)号：US20170314090A1

公开(公告)日：2017-11-02

申请号：US15520148

申请日：2015-10-21

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Yoshihiko ODA ,  Tadashi NAKANISHI

IPC: C21D9/46 ,  C21D6/00 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C22C38/60

Abstract: Disclosed is a non-oriented electrical steel sheet that is low in iron loss and exhibits excellent magnetic properties even when subjected to final annealing at high temperature. The non-oriented electrical steel sheet can be obtained from a steel (low-Al steel) having a chemical composition containing, in mass %, C: 0.005% or less, Si: 1.0% to 4.5%, Mn: 0.02% to 2.0%, Sol.Al: 0.001% or less, P: 0.2% or less, S+Se: 0.0010% or less, N: 0.005% or less, O: 0.005% or less, and Cu: 0.02% to 0.30%, and the balance consisting of Fe and incidental impurities.

公开(公告)号：US20170260600A1

公开(公告)日：2017-09-14

申请号：US15329938

申请日：2015-06-01

Applicant: JFE STEEL CORPORATION

Inventor： Tomoyuki OKUBO ,  Tadashi NAKANISHI ,  Yoshihiko ODA ,  Shinji KOSEKI

IPC: C21D9/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  H02K1/02 ,  C21D9/46 ,  C21D8/12 ,  C21D1/30 ,  H02K15/02 ,  C22C38/60 ,  C22C38/00

CPC classification number: C21D9/0068 ,  C21D1/30 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  H01F1/16 ,  H02K1/02 ,  H02K15/02

Abstract: A non-oriented electrical steel sheet is obtained by subjecting a slab containing C: not more than 0.005 mass %, Si: 1.0-5.0 mass %, Mn: 0.04-3.0 mass %, sol. Al: not more than 0.005 mass %, P: 0.03-0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, B: not more than 0.001 mass %, and Se: not more than 0.001 mass % and satisfying sol. Al+C+5B+5Se≦0.005 mass % to hot rolling, cold rolling and finish annealing. A sheet temperature at the outlet side of the rolling machine in at least one pass of the final cold rolling is set to a range of 100-300° C. to provide S/2M of not less than 1.0 and S/5C of not less than 1.0 when X-ray intensity ratios of {001} , {111} and {001} in a central layer in a thickness direction are S, M and C, respectively.

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：US20210151229A1

公开(公告)日：2021-05-20

申请号：US16771216

申请日：2018-12-10

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihiko ODA ,  Yoshiaki ZAIZEN ,  Tatsuhiko HIRATANI

IPC: H01F1/147 ,  B32B15/01 ,  C22C38/60 ,  B32B7/02 ,  C22C38/12 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00

Abstract: Provided is a multilayer electrical steel sheet having both 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 each of the surface layers has a Si content of 2.5 mass % to 6.0 mass %, the inner layer has a Si content of 1.5 mass % to 5.0 mass %, and the multilayer electrical steel sheet has: ΔSi of 0.5 mass % or more; ΔAl of 0.05 mass % or less; Δλ1.0/400 of 1.0×10−6 or less; a sheet thickness t of 0.03 mm to 0.3 mm; and a ratio of a total thickness of the surface layers ti tot of from 0.10 to 0.70.

公开(公告)号：US20200308676A1

公开(公告)日：2020-10-01

申请号：US16770617

申请日：2018-12-10

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiaki ZAIZEN ,  Yoshihiko ODA ,  Tatsuhiko HIRATANI

IPC: C22C38/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/12

Abstract: Provided is a multilayer electrical steel sheet having both 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 the inner layer have a predetermined chemical composition, the multilayer electrical steel sheet having: ΔSi of 0.5 mass % to 4.0 mass %; ΔAl of 0.05 mass % or less; a ratio of ti to t represented by ti/t of from 0.10 to 0.70; a magnetic flux density Bio of 1.3 T or more; and a ratio of B1 to B10 represented by B1/B10 of 0.45 or more; and an iron loss W10/1k in W/kg and the sheet thickness t in mm satisfy the following formula (1): W10/1k≤15+140×t  (1).