公开(公告)号：US20240240292A1

公开(公告)日：2024-07-18

申请号：US18263707

申请日：2022-02-02

Applicant: JFE STEEL CORPORATION

Inventor： Makoto WATANABE ,  Takuya YAMADA ,  Takashi TERASHIMA

IPC: C22C38/02 ,  C21D6/00 ,  C21D8/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14

CPC classification number: C22C38/02 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/04 ,  C22C38/12 ,  C22C38/14 ,  C21D2201/05

Abstract: To provide a method of producing a grain-oriented electrical steel sheet whereby greater purification of an inhibitor-strengthening element can be promoted by improvement of an annealing separator and, as a result, iron loss can be effectively improved. The annealing separator contains 1 to 10 parts by mass of a composite oxide, relative to 100 parts by mass of MgO, the composite oxide containing at least one selected from a Group 1: Fe, Mn, Al and Ca, and at least one of a Group 2: Zr, Ta, Mo and Nb.

公开(公告)号：US20230326638A1

公开(公告)日：2023-10-12

申请号：US18041797

申请日：2021-08-31

Applicant: JFE STEEL CORPORATION

Inventor： Takuya YAMADA ,  Takashi TERASHIMA

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

CPC classification number: H01F1/16 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C22C2202/02

Abstract: To stably produce grain-oriented electrical steel sheets with excellent film properties and magnetic properties. A method of producing a grain-oriented electrical steel sheet of this disclosure comprises subjecting a steel slab containing predetermined additive elements to hot rolling; subjecting the hot-rolled sheet to cold rolling to have a final sheet thickness; subjecting the cold-rolled sheet to decarburization annealing; applying an annealing separator having MgO as a main component to the decarburization annealing sheet; and subjecting the decarburization annealing sheet to finish annealing. The main component of the annealing separator has a BET specific surface area ratio H2O/N2 of 0.6 to 1.6 and a percentage of particles with a particle size of 40 µm or more in a slurry state of 5 mass% or less.

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：US20240254600A1

公开(公告)日：2024-08-01

申请号：US18546780

申请日：2022-03-15

Applicant: JFE STEEL CORPORATION

Inventor： Makoto WATANABE ,  Takuya YAMADA

IPC: C22C38/02 ,  C21D3/04 ,  C21D6/00 ,  C21D8/12 ,  C22C38/04

CPC classification number: C22C38/02 ,  C21D3/04 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/04

Abstract: Proposed is a way to improve film adhesion when magnetic domain refining treatment is performed. The Mn+Fe concentration in the ceramic base film of a grain-oriented electrical steel sheet is 0.05 mass % or more, and the Young's modulus of the base film is 108 GPa to 144 GPa.

公开(公告)号：US20240247333A1

公开(公告)日：2024-07-25

申请号：US18264928

申请日：2022-03-03

Applicant: JFE STEEL CORPORATION

Inventor： Makoto WATANABE ,  Takashi TERASHIMA ,  Takuya YAMADA

IPC: C21D11/00 ,  C21D1/26 ,  C21D3/04 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04

CPC classification number: C21D11/00 ,  C21D1/26 ,  C21D3/04 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04

Abstract: In determining the conditions for final annealing, information on the concentration of enriched components over the entire length and width of the steel sheet after decarburization annealing is obtained, the optimum function of product properties in the relationship between enriched components and control conditions for final annealing is obtained in advance, and the distribution of the control conditions for final annealing within the coil were considered while determining the control conditions for final annealing such that the area where the deviation of the product properties from the above optimum function is within a range of ±δ is maximized over the entire length and width.

公开(公告)号：US20240026482A1

公开(公告)日：2024-01-25

申请号：US18258327

申请日：2022-01-20

Applicant: JFE STEEL CORPORATION

Inventor： Takuya YAMADA ,  Makoto WATANABE ,  Takashi TERASHIMA

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

CPC classification number: C21D9/46 ,  C22C38/12 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/001 ,  C22C38/14 ,  C22C38/002 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D6/008 ,  C21D6/005 ,  C22C2202/02 ,  C21D2201/05

Abstract: Provided is a method for stably producing a grain-oriented electrical steel sheet with excellent magnetic properties by effectively purifying inhibitors. The method for producing a grain-oriented electrical steel sheet includes using a steel slab containing a predetermined amount of at least one of Ti, Zr, Hf, V, Nb, and Ta, and applying an annealing separator, in which 1 part by mass to 10 parts by mass of a metal compound is added with respect to 100 parts by mass of MgO, on the steel sheet surface with a ratio of particles with a particle size of 1 μm or more in the metal compound being 0.0010 particles/μm2 or less.