公开(公告)号：US20240096531A1

公开(公告)日：2024-03-21

申请号：US18277015

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takeaki WAKISAKA ,  Tesshu MURAKAWA ,  Yoshiaki NATORI ,  Hiroshi FUJIMURA

IPC: H01F1/147 ,  B32B15/01 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/20 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60

CPC classification number: H01F1/14791 ,  B32B15/011 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/20 ,  C22C38/32 ,  C22C38/34 ,  C22C38/60 ,  C22C2202/02

Abstract: There is provided a non-oriented electrical steel sheet having a predetermined chemical composition, in which an area fraction of a crystal structure A composed of crystal grains having a grain size of 100 μm or more is 1% to 30% in a cross section parallel to a rolled plane of the non-oriented electrical steel sheet, an average grain size of a crystal structure B which is a crystal structure other than the crystal structure A is 40 μm or less, and a Vickers hardness HvA of the crystal structure A and a Vickers hardness HvB of the crystal structure B satisfy Equation 1 ((HvA2+HvB2)/2−(HvA+HvB)2/4≤7.0).

公开(公告)号：US20210172036A1

公开(公告)日：2021-06-10

申请号：US16771533

申请日：2019-02-15

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeshi KUBOTA ,  Takeaki WAKISAKA ,  Takashi MOROHOSHI ,  Masafumi MIYAZAKI

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

Abstract: A non-oriented electrical steel sheet according to one embodiment of the invention has a chemical composition represented by C: 0.0030% or less, Si: 2.00% or less, Al: 1.00% or less, Mn: 0.10% to 2.00%, S: 0.0030% or less, one or more selected from the group consisting of Mg, Ca, Sr, Ba, Nd, Pr, La, Ce, Zn, and Cd: 0.0015% to 0.0100% in total, a parameter Q represented by Q=[Si]+2×[Al]−[Mn]: 2.00 or less; Sn: 0.00% to 0.40%, Cu: 0.00% to 1.00%, and a remainder: Fe and impurities, and a parameter R represented by R=(I100+I310+I411+I521)/(I111+I211+I332+I221) is 0.80 or greater.

公开(公告)号：US20210062286A1

公开(公告)日：2021-03-04

申请号：US16958097

申请日：2019-02-15

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeshi KUBOTA ,  Takeaki WAKISAKA ,  Masafumi MIYAZAKI ,  Takashi MOROHOSHI

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

Abstract: A non-oriented electrical steel sheet according to one embodiment of the invention has a chemical composition represented by C: 0.0030% or less, Si: 2.00% or less, Al: 1.00% or less, Mn: 0.10% to 2.00%, S: 0.0030% or less, one or more selected from the group consisting of Mg, Ca, Sr, Ba, Nd, Pr, La, Ce, Zn, and Cd: 0.0003% or greater and less than 0.0015% in total, a parameter Q represented by Q=[Si]+2x[Al]−[Mn]: 2.00 or less; Sn: 0.00% to 0.40%, Cu: 0.00% to 1.00%, and a remainder: Fe and impurities, and a parameter R represented by R−(I100+I310+I411+I521)/(I111+I211+I332+I221) is 0.80 or greater.

公开(公告)号：US20240153684A1

公开(公告)日：2024-05-09

申请号：US18284032

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeaki WAKISAKA ,  Yoshiaki NATORI

IPC: H01F1/147 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/34 ,  C22C38/60

CPC classification number: H01F1/14791 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/125 ,  C21D8/1255 ,  C21D8/1261 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/28 ,  C22C38/34 ,  C22C38/60 ,  C22C2202/02

Abstract: In this non-oriented electrical steel sheet, an area proportion of crystal grains having a crystal grain size of less than 200 μm is 10% or lower when a boundary with a crystal orientation difference of 2° or more and less than 15° is regarded as a crystal grain boundary in a cross section parallel to a steel sheet surface.

公开(公告)号：US20230110399A1

公开(公告)日：2023-04-13

申请号：US18077106

申请日：2022-12-07

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeaki WAKISAKA ,  Ichiro TANAKA

IPC: H01F1/147 ,  H02K15/03 ,  C21D8/12 ,  C21D8/02

Abstract: A non oriented electrical steel sheet includes, as a chemical composition, by mass %, 1.0% or more and 5.0% or less of Si, wherein a sheet thickness is 0.10 mm or more and 0.35 mm or less, an average grain size is 30 μm or more and 200 μm or less, an X1 value defined by X1=(2×B50L+B50C)/(3×IS) is less than 0.845, an E1 value defined by E1=EL/EC is 0.930 or more, and an iron loss W10/1k is 80 W/kg or less.

公开(公告)号：US20220186330A1

公开(公告)日：2022-06-16

申请号：US17425901

申请日：2020-02-14

Applicant: NIPPON STEEL CORPORATION

Inventor： Tesshu MURAKAWA ,  Hiroshi FUJIMURA ,  Takeaki WAKISAKA ,  Takeshi KUBOTA

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

Abstract: The present disclosure has as its object the provision of non-oriented electrical steel sheet excellent in magnetic properties which is free from any drop in magnetic flux density even after stress relief annealing and a method for manufacturing the same.
Non-oriented electrical steel sheet having a chemical composition containing C: 0.0030 mass % or less, Si: 2.0 mass % or more and 4.0 mass % or less, Al: 0.010 mass % or more and 3.0 mass % or less, Mn: 0.10 mass % or more and 2.4% mass or less, P: 0.0050 mass % or more and 0.20 mass % or less, S: 0.0030 mass % or less, and one or more elements selected from the group comprising Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: total 0.00050 mass % or more and having a balance of Fe and unavoidable impurities, where, when designating a mass % of Si as [Si], a mass % of Al as [Al], and a mass % of Mn as [Mn], a parameter Q shown by the following formula (1) is 2.0 or more, a random intensity ratio of the {100} orientation is 2.4 or more, and an average grain size is 30 μm or less: Q=[Si]+2[Al]−[Mn]  (1)

公开(公告)号：US20230416892A1

公开(公告)日：2023-12-28

申请号：US18464879

申请日：2023-09-11

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Takeaki WAKISAKA

IPC: C22C38/60 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  H01F1/147

CPC classification number: C22C38/60 ,  C22C2202/02 ,  C22C38/002 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  H01F1/14716 ,  C22C38/001

Abstract: A non oriented electrical steel sheet includes, as a chemical composition, by mass %, 1.0% or more and 5.0% or less of Si, wherein a sheet thickness is 0.10 mm or more and 0.35 mm or less, an average grain size is 30 μm or more and 200 μm or less, an X value defined by X=(2×B50L+B50C)/(3×IS) is 0.800 or more, and an iron loss W10/1k is 80 W/kg or less.

公开(公告)号：US20210213515A1

公开(公告)日：2021-07-15

申请号：US17054977

申请日：2019-05-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Masafumi MIYAZAKI ,  Takeaki WAKISAKA ,  Takashi ARAI ,  Naotsugu YOSHIDA

IPC: B22D11/16 ,  B22D11/06

Abstract: This thin strip manufacture method is a thin strip manufacture method for manufacturing a thin strip by supplying molten steel to a molten steel pool formed by a pair of rotating cooling drums and a pair of side weirs to form and grow a solidified shell on a peripheral surface of the cooling drums, wherein a pressing force P of the pair of the cooling drums is set so that the pressing force P (kgf/mm) of the pair of cooling drums, casting thickness D (mm), and radius R (m) of the cooling drums satisfy 0.90≤P×(D×R)0.5≤1.30.

公开(公告)号：US20240309498A1

公开(公告)日：2024-09-19

申请号：US18279725

申请日：2022-03-30

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeaki WAKISAKA ,  Yoshiaki NATORI

IPC: C22C38/02 ,  B21D28/14 ,  B21D35/00 ,  C21D8/12

CPC classification number: C22C38/02 ,  B21D28/14 ,  B21D35/005 ,  C21D8/1216

Abstract: This non-grain-oriented electrical steel sheet is a non-grain-oriented electrical steel sheet including a silicon steel sheet as a base material, wherein the silicon steel sheet has a predetermined mechanical property depending on a direction with respect to a rolling direction, and the difference between a maximum value and a minimum value of diameters of circular holes after punching with a substantially circular die is 0.20% or less of the average value of the maximum value and the minimum value.

公开(公告)号：US20240013959A1

公开(公告)日：2024-01-11

申请号：US18349739

申请日：2023-07-10

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeaki WAKISAKA ,  Ichiro TANAKA

IPC: C21D9/46 ,  C22C38/14 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D8/12 ,  C21D6/00 ,  C21D1/30 ,  H01F1/153

CPC classification number: C21D9/46 ,  C22C38/14 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/004 ,  C22C38/002 ,  C22C38/001 ,  C21D8/0205 ,  C21D8/1216 ,  C21D8/1244 ,  C21D6/005 ,  C21D6/008 ,  C21D1/30 ,  H01F1/153 ,  C22C2202/02

Abstract: A non oriented electrical steel sheet includes, as a chemical composition, by mass %, 1.0% or more and 5.0% or less of Si, wherein a sheet thickness is 0.10 mm or more and 0.35 mm or less, an average grain size is 30 μm or more and 200 μm or less, an X1 value defined by X1=(2×B50L+B50C)/(3×IS) is less than 0.845, an E1 value defined by E1=EL/EC is 0.930 or more, and an iron loss W10/1k is 80 W/kg or less.