公开(公告)号：US20220349037A1

公开(公告)日：2022-11-03

申请号：US17638461

申请日：2020-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu MURAKAWA ,  Miho TOMITA ,  Satoshi KANO

IPC: C22C38/60 ,  C22C38/00 ,  C22C38/16 ,  C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/10 ,  C21D8/02

Abstract: A method for manufacturing a non-oriented electrical steel sheet includes a step of obtaining a hot-rolled steel sheet by performing hot rolling on a steel material having a predetermined chemical composition, a step of performing first cold rolling on the hot-rolled steel sheet, and a step of performing first annealing after the first cold rolling. A final pass of finish rolling is performed in a temperature range equal to or higher than an Ar1 temperature, and cooling of which an average cooling rate is in a range of 50 to 500° C./sec is started in 0.1 sec from completion of rolling of the final pass of the finish rolling and is performed up to a temperature range higher than 250° C. and equal to or lower than 700° C.

公开(公告)号：US20210292863A1

公开(公告)日：2021-09-23

申请号：US17257466

申请日：2019-10-24

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroshi FUJIMURA ,  Satoshi KANO ,  Miho TOMITA

IPC: C21D8/12 ,  C22C38/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C21D8/02 ,  C21D9/00 ,  C21D9/46 ,  H01F1/147 ,  B21D28/02

Abstract: Provided are a non-oriented electrical steel sheet with which it is possible to improve steel sheet transferability even when punching is performed successively at high speed, and a method of manufacturing a stacked core using the same. The non-oriented electrical steel sheet contains, by mass percent, Si: 2.0 to 5.0%, Mn: 0.4 to 5.0%, Al≤3.0%, C: 0.0008 to 0.0100%, N≤0.0030%, S≤0.0030%, and Ti≤0.0060%, wherein the product of the contents of Mn and C is 0.004 to 0.05 mass %2, the yield strength in rolling direction is more than or equal to 600 MPa, and the Young's modulus is more than or equal to 200 GPa. In the method of manufacturing a stacked core, when manufacturing a stacked core using a progressive die, the steel sheet transfer speed V (m/s) satisfies expression (1). V: VMIN to VMAX (1) VMAX=( 1/25)√(t2×E×YS) (2) VMIN=( 1/25)√(t2×120000) (3) t: Steel sheet thickness (mm), E: Young's ratio (GPa), YS: Yield strength (MPa)

公开(公告)号：US20230137498A1

公开(公告)日：2023-05-04

申请号：US17918567

申请日：2021-04-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Miho TOMITA ,  Kazutoshi TAKEDA ,  Takuya MATSUMOTO

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60 ,  C21D8/12

Abstract: A non-oriented electrical steel sheet including a base metal that has a chemical composition including, in mass %, C: 0.0010 to 0.0040%, Si: 3.5 to 4.9%, Mn: 0.05 to 0.20%, Al: 0.05 to 0.45%, P: 0.030% or less, S: 0.0030% or less, N: 0.0030% or less, O: 0.0100 to 0.0400%, Ca: less than 0.0010%, Ti: less than 0.0050%, Nb: less than 0.0050%, Zr: less than 0.0050%, V: less than 0.0050%, Cu: less than 0.20%, Ni: less than 0.50%, Sn: 0 to 0.05%, Sb: 0 to 0.05%, and a balance: Fe and impurities, and satisfying [4.0≤Si+Al≤5.0], in which the base metal has an O content of less than 0.0050% in a region excluding a portion from a surface of the base metal to a position of 10 μm in a depth direction of the base metal.

公开(公告)号：US20220384085A1

公开(公告)日：2022-12-01

申请号：US17774771

申请日：2020-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryu HIRAYAMA ,  Tesshu MURAKAWA ,  Miho TOMITA

IPC: H01F27/245 ,  H01F1/147 ,  H01F41/02

Abstract: A laminated core (100) has a plurality of legs having an extension direction in a direction perpendicular to a lamination direction of electrical steel sheets and a plurality of yokes having an extension direction in a direction orthogonal to the lamination direction of the electrical steel sheets and the extension direction of the legs, and, in the same position of the electrical steel sheet in the lamination direction, at least a partial region of the legs and at least a partial region of the yokes are configured by the same electrical steel sheet. The electrical steel sheet is disposed such that a first direction of directions of easy magnetization of the electrical steel sheet is along the extension direction of the legs and a second direction of the directions of easy magnetization of the electrical steel sheet is along the extension direction of the yokes.

公开(公告)号：US20210343458A1

公开(公告)日：2021-11-04

申请号：US17259837

申请日：2019-11-01

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyoshi YASHIKI ,  Yoshiaki NATORI ,  Miho TOMITA ,  Kazutoshi TAKEDA ,  Takuya MATSUMOTO

IPC: H01F1/147 ,  C22C38/60 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/08 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00

Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+sol. Al+0.5×Mn≥4.3], and an average grain size of the base metal is more than 40 μm and 120 μm or less.