公开(公告)号：US20230065674A1

公开(公告)日：2023-03-02

申请号：US17977178

申请日：2022-10-31

Applicant: JFE STEEL CORPORATION

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

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  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：US20220375667A1

公开(公告)日：2022-11-24

申请号：US17755318

申请日：2020-05-13

Applicant: JFE STEEL CORPORATION

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

IPC: H01F1/16 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21C7/06

Abstract: Provides is a non-oriented electrical steel sheet suitable for use in a rotor of an IPM motor that has excellent magnetic flux density B50 and high-frequency iron loss properties, high tensile strength and fatigue strength, and little variation in tensile strength. The non-oriented electrical steel sheet has a predetermined steel sheet chemical composition and a microstructure in which a ratio of non-recrystallized microstructure is 5% or more and 70% or less and the number of inclusion having a diameter of 5 μm or more is not more than 5 counts/mm2.

公开(公告)号：US20190330710A1

公开(公告)日：2019-10-31

申请号：US16476937

申请日：2018-01-12

Applicant: JFE STEEL CORPORATION

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

IPC: C21D9/46 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147

Abstract: According to the disclosure, it is possible to increase the magnetic flux density and reduce iron loss by setting 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 at least one of Sb: 0.0010% or more and 0.10% or less, and Sn: 0.0010% or more and 0.10% or less, with the balance being Fe and inevitable impurities, 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：US20190099800A1

公开(公告)日：2019-04-04

申请号：US16082698

申请日：2017-03-07

Applicant: JFE STEEL CORPORATION

Inventor： Kunihiro SENDA ,  Masanori UESAKA ,  Yoshihiko ODA

IPC: B21D43/09 ,  B21D28/02 ,  H02K15/02 ,  H01F41/02 ,  H01F27/245

Abstract: A method of manufacturing a laminated iron core includes: inserting a plurality of electrical steel strips in a superposed state to feed rolls including a pair of upper and lower feed rolls that are driven by a drive device to feed the electrical steel strips in a superposed state into a die having a plurality of punching processes in sequence; joining a part or all of the superposed electrical steel strips together before entering the die or at an upstream stage portion of the die after feeding out the electrical steel strips from the pair of upper and lower feed rolls; and punching simultaneously the plurality of electrical steel strips in a superposed state in the die.

公开(公告)号：US20160203895A1

公开(公告)日：2016-07-14

申请号：US14909940

申请日：2014-08-11

Applicant: JFE STEEL CORPORATION

Inventor： Tadashi NAKANISHI ,  Shinji KOSEKI ,  Yoshihiko ODA ,  Hiroaki TODA

IPC: H01F1/16 ,  C22C38/06 ,  B21B3/02 ,  C22C38/02 ,  C22C38/00 ,  H01F1/34 ,  C22C38/60 ,  C22C38/04

CPC classification number: C22C38/00 ,  B21B3/02 ,  C21C7/04 ,  C21D8/12 ,  C21D8/1233 ,  C21D8/1272 ,  C21D2211/004 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  H01F1/16 ,  H01F1/342

Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss at not only a commercial frequency but also a high frequency zone, which has a chemical composition including C: not more than 0.0050 mass %, Si: more than 1.5 mass % but not more than 5.0 mass %, Mn: not more than 0.10 mass %, sol. Al: not more than 0.0050 mass, P: more than 0.040 mass % but not more than 0.2 mass %, S: not more than 0.0050 mass %, N: not more than 0.0040 mass % and Ca: 0.001-0.01 mass % and the remainder being Fe and inevitable impurities and a compositional ratio of CaO in oxide-based inclusions existing in a steel sheet of not less than 0.4 and/or a compositional ratio of Al2O3 of not less than 0.3, and a hot rolled steel sheet used as a raw steel material thereof.

Abstract translation: 不仅商业频率高频区具有高磁通密度和低铁损的无方向性电磁钢板，其具有C：不大于0.0050质量％的化学组成，Si：大于 1.5质量％以上且5.0质量％以下，Mn：0.10质量％以下。 Al：0.0050质量％以下，P：大于0.040质量％以上0.2质量％以下，S：0.0050质量％以下，N：0.0040质量％以下，Ca：0.001-0.01质量％ 余量为Fe和不可避免的杂质，钢板中存在的氧化物系夹杂物中的CaO的组成比不小于0.4，和/或Al 2 O 3的组成比为0.3以上，热轧钢板用作 生钢材料。

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：US20220195570A1

公开(公告)日：2022-06-23

申请号：US17594382

申请日：2020-04-13

Applicant: JFE STEEL CORPORATION

Inventor： Yukino MIYAMOTO ,  Yoshiaki ZAIZEN ,  Yoshihiko ODA

IPC: C22C38/14 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/12

Abstract: A non-oriented electrical steel sheet having: low high-frequency iron loss and high magnetic flux density; an inner layer and surface layers provided on both sides of the inner layer, the surface layers and the inner layer having specific chemical compositions; the thickness t of 0.01 mm to 0.35 mm; a multilayer ratio of ti to t of 0.10 to 0.70, t1 denoting a total thickness of the surface layers; a difference between [Si]1 and [Si]0 of 1.0 mass % to 4.5 mass % or less, [Si]1 denoting a Si content in each of the surface layers and [Si]0 denoting a Si content in the inner layer; and a difference between [Mn]0 and [Mn]1 of 0.01 mass % to 0.40 mass %, [Mn]0 denoting a Mn content at a mid-thickness position t/2 and [Mn]1 denoting an average Mn content in a region from a surface to a position at a depth of ( 1/10)t.

公开(公告)号：US20190312495A1

公开(公告)日：2019-10-10

申请号：US16335949

申请日：2017-08-22

Applicant: JFE STEEL CORPORATION

Inventor： Kunihiro SENDA ,  Masanori UESAKA ,  Yoshihiko ODA

IPC: H02K15/02 ,  B21D28/02 ,  B21D28/26

Abstract: A punch processing method for electrical steel sheets to manufacture core segments includes: stacking a plurality of electrical steel sheets; and punching out the plurality of electrical steel sheets in a stacked state simultaneously to manufacture the core segments, wherein in a case where the core segments are applied to a stator core in which a maximum magnetic flux density at a tooth portion is to be higher than a maximum magnetic flux density at a back yoke portion, degrees of Vickers hardness of an electrical steel sheet located second from a bottom side and above in the stacked state are set to 180 HV or higher, and 10 HV or higher than a value of degree of Vickers hardness of an electrical steel sheet located on the bottom side in the stacked state.

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：US20150348686A1

公开(公告)日：2015-12-03

申请号：US14759891

申请日：2014-01-16

Applicant: JFE STEEL CORPORATION

Inventor： Hiroaki TODA ,  Yoshiaki ZAIZEN ,  Tadashi NAKANISHI ,  Yoshihiko ODA

IPC: H01F1/147 ,  C21D6/00 ,  C21D9/46 ,  C22C38/60 ,  H01F41/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F1/16 ,  C21D8/12 ,  C22C38/12

CPC classification number: H01F1/14775 ,  B21B3/02 ,  C21D6/005 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1222 ,  C21D8/1255 ,  C21D8/1261 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/60 ,  H01F1/14791 ,  H01F1/16 ,  H01F41/02

Abstract: By using a hot-rolled steel sheet of a predetermined chemical composition, and annealing the hot-rolled steel sheet in nitrogen atmosphere at 1000° C. for 30 seconds, and then immersing in a solution of 7% HCl at 80° C. for 60 seconds to obtain a hot-rolled steel sheet having a pickling weight loss of 10 g/m2 or more and 35 g/m2 or less, it is possible to obtain a hot-rolled steel sheet for producing a non-oriented electrical steel sheet that not only has excellent magnetic properties such as iron loss properties and magnetic flux density, but also has reduced steel sheet surface defects and an excellent manufacturing yield.

Abstract translation: 通过使用规定的化学成分的热轧钢板，在1000℃的氮气气氛中对该热轧钢板退火30秒，然后在80℃下浸渍在7％HCl的溶液中， 60秒以获得酸洗重量减少为10g / m 3以上且35g / m 2以下的热轧钢板，可以得到用于制造无方向性电工钢板的热轧钢板 不仅具有优异的磁性能，例如铁损特性和磁通密度，而且还减少了钢板表面缺陷和优异的制造成品率。