公开(公告)号：US12195831B2

公开(公告)日：2025-01-14

申请号：US17774370

申请日：2020-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu Murakawa ,  Miho Tomita ,  Hiroshi Fujimura ,  Satoshi Kano

IPC: C22C38/16 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10

Abstract: What is provided is a non-oriented electrical steel sheet having a chemical composition in which, by mass %, C: 0.010% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less, one or a plurality of elements selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu and Au: 2.50% to 5.00% in total are contained and a remainder includes Fe and impurities, in which a sheet thickness is 0.50 mm or less, and, in an arbitrary cross section, when an area ratio of {100} crystal grains is indicated by Sac, an area ratio of {110} crystal grains is indicated by Sag, and an area ratio of the {100} crystal grains in a region of up to 20% from a side where a KAM value is high is indicated by Sbc, Sac>Sbc>Sag and 0.05>Sag are satisfied.

公开(公告)号：US11111567B2

公开(公告)日：2021-09-07

申请号：US16970573

申请日：2019-03-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu Murakawa ,  Hiroshi Fujimura ,  Satoshi Kano

IPC: C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C21D9/46 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  H01F1/147 ,  B32B15/01 ,  C23C30/00 ,  C22C38/40 ,  C22C38/02 ,  C22C38/08 ,  C22C38/16 ,  C22C38/18 ,  C22C38/20 ,  C22C38/38 ,  C22C38/58

Abstract: A non-oriented electrical steel sheet including, as a chemical composition, by mass %: C: 0.0030 % or less; Si: 2.00 % to 4.00 %; Al: 0.01 % to 3.00 %; Mn: 0.10 % to 2.00 %; P: 0.005 % to 0.200 %; S: 0.0030 % or less; Cu: more than 1.0 % and 3.0 % or less; Ni: 0.10 % to 3.0 %; one or more coarse precipitate forming element: more than 0.0005 % and 0.0100 % or less in total; a parameter Q (Q=[Si] +2 [Al] [Mn]) is 2.00 or more; Sn: 0.00 % to 0.40 %; Cr: 0.0 % to 10.0 %, and a remainder: Fe and impurities, wherein a number of Cu particles having a diameter of less than 100 nm is 5 or more per 10 μm2, a {100} crystal orientation intensity is 2.4 or more, a thickness is 0.10 mm to 0.60 mm, and an average grain size is 70 μm to 200 μm.

公开(公告)号：US12211633B2

公开(公告)日：2025-01-28

申请号：US17769272

申请日：2020-11-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu Murakawa ,  Miho Tomita ,  Hiroshi Fujimura ,  Satoshi Kano

IPC: H01F1/147 ,  C21D1/30 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/16 ,  C22C38/60

Abstract: What is provided is a non-oriented electrical steel sheet having a chemical composition in which, by mass %, C: 0.010% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less and one or a plurality of elements selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu and Au: 2.50% to 5.00% in total with a remainder including Fe and impurities, in which a recrystallization rate is 1% to 99% in a metallographic structure, a sheet thickness is 0.50 mm or less, and, in the case of measuring a magnetic flux density B50 after annealing the non-oriented electrical steel sheet at 800° C. for two hours, a magnetic flux density B50 in a 45° direction with respect to a rolling direction is 1.75 T or more.

公开(公告)号：US11795518B2

公开(公告)日：2023-10-24

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

CPC classification number: C21D8/12 ,  B21D28/02 ,  C21D8/0263 ,  C21D9/0012 ,  C21D9/46 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/14775 ,  C21D2261/00 ,  C22C2202/02

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).