公开(公告)号：US20240321492A1

公开(公告)日：2024-09-26

申请号：US18580493

申请日：2022-06-08

Applicant: JFE STEEL CORPORATION

Inventor： Hirotaka INOUE ,  Takeshi OMURA ,  Kunihiro SENDA

IPC: H01F1/147 ,  C21D1/30 ,  C21D6/00 ,  C21D10/00 ,  H01F27/245

CPC classification number: H01F1/14783 ,  C21D1/30 ,  C21D6/00 ,  C21D10/00 ,  H01F27/245 ,  C21D2201/05

Abstract: A wound core with low transformer iron loss and good magnetic characteristics without using two or more types of materials with different magnetic characteristics. The wound core includes a grain-oriented electrical steel sheet as a material and has a flat surface portion, a corner portion adjacent to the flat surface portion, a lap portion in the flat surface portion, and a bent portion in the corner portion, and the ratio of the length of the outer circumference to the length of the inner circumference (the length of the outer circumference/the length of the inner circumference) is 1.70 or less when viewed from the side, and the grain-oriented electrical steel sheet has a magnetic flux density B8 in the range of 1.92 T to 1.98 T at a magnetic field strength H of 800 A/m and has a specified iron loss deterioration rate of 1.30 or less under harmonic superposition.

公开(公告)号：US20240279763A1

公开(公告)日：2024-08-22

申请号：US18570067

申请日：2022-06-30

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke SHIMOYAMA ,  Yukihiro SHINGAKI ,  Hiroi YAMAGUCHI

IPC: C21D9/46 ,  B21B3/02 ,  C21D1/18 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/32 ,  C22C38/34 ,  C22C38/42 ,  C22C38/60 ,  H01F1/147

CPC classification number: C21D9/46 ,  B21B3/02 ,  C21D1/18 ,  C21D6/001 ,  C21D6/002 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/20 ,  C22C38/22 ,  C22C38/32 ,  C22C38/34 ,  C22C38/42 ,  C22C38/60 ,  H01F1/14783 ,  C21D2201/05 ,  C22C2202/02

Abstract: To provide a method of producing a grain-oriented electrical steel sheet that can stably produce a grain-oriented electrical steel sheet with low iron loss and little variation in iron loss using a tandem mill. Disclosed is a method of producing a grain-oriented electrical steel sheet, including: hot rolling; a single cycle of cold rolling, or multiple cycles of cold rolling with intermediate annealing in between; decarburization annealing; and secondary recrystallization annealing, in which annealing preceding final cold rolling is performed with an average cooling rate of 20° C./s or higher in a temperature range from 800° C. to 350° C., and the final cold rolling is performed using a tandem mill, where the steel sheet is heated to a temperature range from 70° C. to 200° C. and then cooled to 60° C. or lower within 10 seconds before being introduced into the first pass of the tandem mill.

公开(公告)号：US20240271241A1

公开(公告)日：2024-08-15

申请号：US18561448

申请日：2022-05-24

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Takuya YAMADA

IPC: C21D9/46 ,  C21D1/30 ,  C21D1/76 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D1/30 ,  C21D1/76 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  H01F1/14775 ,  C21D2201/05 ,  C22C2202/02

Abstract: Provided is a method for manufacturing a grain-oriented electrical steel sheet with excellent uniformity of magnetic properties in the sheet transverse direction without increasing production costs. An ignition loss of an annealing separator after drying: IGLOSS (mass %), a storage time of a cold-rolled steel sheet: T (hr), and a carbon dioxide concentration in a storage environment of the cold-rolled steel sheet: A (mass ppm) satisfy the following formula (1):








A
×
IGLOSS

≤



-
1500

×

Ln
⁡
(
T
)


+
9000.





(
1
)

公开(公告)号：US20240177901A1

公开(公告)日：2024-05-30

申请号：US18283162

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Masataka IWAKI ,  Takashi KATAOKA ,  Tomohito TANAKA ,  Hideyuki HAMAMURA

IPC: H01F1/18 ,  C03C8/02 ,  C03C10/00 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C21D10/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  C23D3/00 ,  C23D5/04 ,  C23D13/00

CPC classification number: H01F1/18 ,  C03C8/02 ,  C03C10/00 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1283 ,  C21D8/1288 ,  C21D9/46 ,  C21D10/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/34 ,  C22C38/60 ,  C23D3/00 ,  C23D5/04 ,  C23D13/00 ,  C03C2204/00 ,  C03C2207/04 ,  C21D2201/05 ,  C22C2202/02

Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, in which, in the base steel sheet, a plurality of linear strain regions that extend continuously or intermittently in a direction intersecting with a rolling direction are present, the plurality of linear strain regions are each 210 μm or less in width in the rolling direction, the plurality of linear strain regions are parallel to each other, intervals of linear strain regions adjacent to each other in the rolling direction are 10 mm or less, and magnetostriction λ0-pb in a unit of μm/m when the grain-oriented electrical steel sheet is excited up to 1.7 T and magnetostriction λ0-pa in a unit of μm/m when the grain-oriented electrical steel sheet is heat-treated at 800° C. for 4 hours and then excited up to 1.7 T satisfy 0.02≤λ0-pb−λ0-pa≤0.20.

公开(公告)号：US11990261B2

公开(公告)日：2024-05-21

申请号：US17998356

申请日：2021-03-04

Applicant: JFE STEEL CORPORATION

Inventor： Yoshihisa Ichihara ,  Takeshi Omura ,  Hirotaka Inoue ,  Kunihiro Senda

IPC: H01F1/16 ,  B32B3/00 ,  B32B3/10 ,  B32B3/26 ,  B32B3/30 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C25F3/06 ,  H01F1/147 ,  C21D7/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/60

CPC classification number: H01F1/16 ,  B32B3/00 ,  B32B3/10 ,  B32B3/26 ,  B32B3/263 ,  B32B3/30 ,  C21D8/1277 ,  C21D8/1294 ,  C21D9/46 ,  C25F3/06 ,  H01F1/147 ,  C21D7/02 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/60 ,  C22C2202/02 ,  Y10T428/12972 ,  Y10T428/12993

Abstract: Provided is a linear groove formation pattern with which both an effect of reducing the building factor and a high magnetic flux density can be obtained. In a grain-oriented electrical steel sheet having a plurality of linear grooves extending in a direction crossing a rolling direction of the steel sheet on a surface of the steel sheet, a surface of the steel sheet between the linear grooves has a recessed defect that is recessed from the surface, a volume fraction of the recessed defect in the steel sheet is 0.0025 vol % or more and 0.01 vol % or less of a steel sheet without the recessed defect, and discontinuous portions that disrupt the extension of the linear grooves are provided at a frequency of 30 or more and 200 or less per square meter of the steel sheet.

公开(公告)号：US11961647B2

公开(公告)日：2024-04-16

申请号：US17041442

申请日：2019-03-29

Applicant: JFE STEEL CORPORATION

Inventor： Takeshi Omura ,  Hirotaka Inoue ,  Seiji Okabe

IPC: H01F1/16 ,  C21D6/00 ,  C21D8/12 ,  H01F27/245

CPC classification number: H01F1/16 ,  C21D6/008 ,  C21D8/12 ,  H01F27/245 ,  C21D2201/05 ,  Y10T428/32

Abstract: Vibration of an iron core is reduced to reduce transformer noise. An iron core for a transformer comprises a plurality of grain-oriented electrical steel sheets stacked together, wherein at least one of the plurality of grain-oriented electrical steel sheets: (1) has a region in which closure domains are formed in a direction crossing a rolling direction and a region in which no closure domains are formed; (2) has an area ratio R0 of 0.10% to 3.0%, the area ratio R0 being defined as a ratio of S0 to S; and (3) has an area ratio R1a of 50% or more, the area ratio R1a being defined as a ratio of S1a to S1.

公开(公告)号：US20240079166A1

公开(公告)日：2024-03-07

申请号：US18268441

申请日：2021-12-17

Applicant: POSCO Co., Ltd.

Inventor： Daehyun SONG ,  Sangwoo LEE

IPC: H01F1/147 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/60

CPC classification number: H01F1/14775 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0257 ,  C21D8/0263 ,  C21D8/0273 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/60 ,  C21D2201/05 ,  C22C2202/02

Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present invention comprises, by wt %, 2.0-4.0% of Si, 0.04-0.2% of Mn, 0.010% or less of N (excluding 0%), 0.005% or less of C (excluding 0%), 0.03-0.08% of Sn and 0.01-0.2% of Cr, the balance of Fe and inevitable impurities, and inclusions comprising at least one from among AlN, (Al,Si)N, (Al,Si,Mn)N, MnS, CuS and Al2O3, wherein the average diameter of the inclusions is 0.5-6.0 μm, and 40-130/mm2 inclusions having a diameter of 6.0 μm or less from among the inclusions can be included.

公开(公告)号：US20240076762A1

公开(公告)日：2024-03-07

申请号：US18462711

申请日：2023-09-07

Applicant: Materion Corporation

Inventor： Andrew Ruzek

IPC: C22C1/04 ,  C21D9/00 ,  C22C25/00

CPC classification number: C22C1/0408 ,  C21D9/00 ,  C22C25/00 ,  C21D2201/05

Abstract: Methods for grain refinement of beryllium articles are disclosed. Grain refinement allows the beryllium article to have beneficial properties in terms of strength and durability. One method stabilizes the β-phase of the beryllium that is precipitated after cycling above a temperature that is greater than or equal to the beta transus temperature.

公开(公告)号：US20240052448A1

公开(公告)日：2024-02-15

申请号：US18260473

申请日：2022-01-26

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke SHIMOYAMA ,  Yukihiro SHINGAKI ,  Hiroi YAMAGUCHI

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

CPC classification number: C21D8/1272 ,  C21D8/1233 ,  C21D8/1222 ,  C22C38/04 ,  C22C38/02 ,  C21D9/46 ,  C21D2201/05

Abstract: Provided is a method of manufacturing a grain-oriented electrical steel sheet, with which a grain-oriented electrical steel sheet with low iron loss and little variation in iron loss can be stably manufactured by a tandem mill. The method includes subjecting a steel material to hot rolling to obtain a hot-rolled sheet, subjecting the hot-rolled sheet to cold rolling once or twice or more with intermediate annealing performed therebetween to obtain a cold-rolled sheet with a final sheet thickness, and then subjecting the cold-rolled sheet to decarburization annealing and then to secondary recrystallization annealing, wherein final cold rolling is performed by a tandem mill, and in the final cold rolling, the hot-rolled sheet is heated to a temperature range of 70° C. or higher and 200° C. or lower, then cooled to 60° C. or lower, and then introduced into a first pass of the tandem mill.

公开(公告)号：US11898215B2

公开(公告)日：2024-02-13

申请号：US17421850

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshiyuki Ushigami ,  Shinji Yamamoto ,  Fumiaki Takahashi ,  Hideyuki Hamamura ,  Shinsuke Takatani ,  Masaru Takahashi

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

CPC classification number: C21D8/1283 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  H01F1/147 ,  C21D2201/05 ,  C22C2202/02

Abstract: The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4), and the grain-oriented electrical steel sheet includes a surface of the base steel sheet (1) having a groove (G) which extends in a direction intersecting a rolling direction of the base steel sheet (1), in which in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1), when a region between end portions of the groove (G) is defined as a groove part (RG), an average thickness of the intermediate layer (4) of the groove part (RG) is 0.5 times or more and 3.0 times or less an average thickness of the intermediate layer (4) other than the groove part (RG), and an area ratio of voids in the insulation coating (3) of the groove part (RG) is 15% or less.