公开(公告)号：US20250118468A1

公开(公告)日：2025-04-10

申请号：US18832028

申请日：2023-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Haruhiko ATSUMI ,  Ryutaro YAMAGATA ,  Takashi KATAOKA ,  Takaaki HIRAYAMA

IPC: H01F1/147 ,  C21D6/00 ,  C21D8/12 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/34 ,  C22C38/40 ,  C22C38/60

Abstract: This grain-oriented electrical steel sheet is characterized in that the base steel sheet has a chemical composition containing, in mass %, Si:2.5-4.5%, Mn:0.01-1.00%, N:≤0.01%, C:≤0.01%, sol.A1:0.01%, S:≤0.01%, Se:≤0.01%, P:0.00-0.05%, Sb:0.00-0.50%, Sn:0.00-0.30%, Cr:0.00-0.50%, Cu:0.00-0.50%, Ni:0.00-0.50%, and Bi:0.0000-0.0100%, with the remainder including Fe and impurities, the magnetic flux density B8 in the rolling direction of the sheet is ≥1.93 T, a deformed region extending over the entire width of the sheet is periodically formed at an interval L of 3-30 mm, in a direction intersecting the rolling direction, this region has a width W of 0.2-30.6 mm, a protrusion having a maximum height Dprotrusion of 1-5 m is formed on one surface of this region, and a recessed part having a maximum depth Drecess of 1-4 μm is formed on the opposite surface.

公开(公告)号：US20230243010A1

公开(公告)日：2023-08-03

申请号：US18008927

申请日：2021-06-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi KATAOKA ,  Haruhiko ATSUMI ,  Ryutaro YAMAGATA ,  Nobusato MORISHIGE ,  Kazutoshi TAKEDA

IPC: C21D8/12 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  C22C38/06 ,  C22C38/00 ,  C22C38/16 ,  C21D9/46 ,  C21D3/04

CPC classification number: C21D8/1283 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  C22C38/06 ,  C22C38/001 ,  C22C38/16 ,  C21D9/46 ,  C21D3/04 ,  C21D8/1222 ,  C22C38/002 ,  C21D8/1272 ,  C21D2201/05

Abstract: Provided is a production method for a grain-oriented electrical steel sheet that is thin and has excellent magnetic characteristics. An embodiment of the present invention provides a production method that is for a grain-oriented electrical steel sheet and that comprises: a hot rolling step; an optional hot-rolled sheet-annealing step; an acid-washing step; a cold rolling step; a primary recrystallization-annealing step; a finishing-annealing step; and a planarization-annealing step. In the acid-washing step, an acid-washing solution containing 0.0001-5.00 g/L of Cu is used. The thickness of a cold-rolled steel sheet is 0.15-0.23 mm. The average temperature increase rate in the temperature range of 30-400° C. in a temperature increase process in the primary recrystallization step is more than 50° C./sec but not more than 1000° C./sec.

公开(公告)号：US20250051891A1

公开(公告)日：2025-02-13

申请号：US18922078

申请日：2024-10-21

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryutaro YAMAGATA ,  Ichiro TANAKA

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

Abstract: An annealing separator used for manufacture of the grain-oriented electrical steel sheet according to the present invention contains MgO, at least one or more types of compounds of metal selected from a group comprised of Y, La, and Ce, at least one or more types of compounds of metal selected from a group comprised of Ti, Zr, and Hf, and at least one or more types of compounds of metal selected from a group comprised of Ca, Sr, and Ba, when a content of the MgO in the annealing separator is defined as 100% by mass %, a total content of the compounds selected from a group comprised of Y, La, and Ce converted to oxides is 0.8 to 8.0%, a total content of the compounds of metal selected from a group comprised of Ti, Zr, and Hf converted to oxides is 0.5 to 9.0%, and a total content of the compounds of metal selected from a group comprised of Ca, Sr, and Ba converted to sulfates is 0.5 to 8.0%, a mean particle size of the compounds of metal selected from a group comprised of Ca, Sr, and Ba is 12 μm or less, a ratio of the mean particle size of the compounds of metal selected from a group comprised of Ca, Sr, and Ba to the mean particle size of the compounds of metal selected from a group comprised of Y, La, and Ce is 0.1 to 3.0, a total of the total content of the compounds of metal selected from a group comprised of Y, La, and Ce converted to oxides and the total content of the compounds of metal selected from a group comprised of Ti, Zr, and Hf converted to oxides is 2.0 to 12.5%, a ratio of a sum of the numbers of Y, La, and Ce atoms to a sum of the numbers of Ti, Zr, and Hf atoms contained in the annealing separator is 0.18 to 4.0, still further a number density of particles of the compounds of metal selected from the group comprised of Y, La, and Ce which are particles of a spherical equivalent diameter based on volume of 0.1 μm or more is 2,000,000,000/g or more, still further a number density of particles of the compounds of metal selected from the group comprised of Ti, Zr, and Hf which are particles of a spherical equivalent diameter based on volume of 0.1 μm or more is 2,000,000,000/g or more, and still further a number density of particles of the compounds of metal selected from the group comprised of Ca, Sr, and Ba which are particles of a spherical equivalent diameter based on volume of 0.1 μm or more is 2,000,000,000/g or more.

公开(公告)号：US20230002849A1

公开(公告)日：2023-01-05

申请号：US17901936

申请日：2022-09-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryutaro YAMAGATA ,  Nobusato MORISHIGE ,  Ichiro TANAKA

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

Abstract: Grain-oriented electrical steel sheet excellent in magnetic properties and adhesion of a primary coating to a base steel sheet and with few defects where the base metal is exposed in point defects and a method for manufacturing grain-oriented electrical steel sheet are provided. This is characterized by being provided with a base steel sheet and a primary coating. The primary coating satisfies (1) Number density D3 of Al concentrated regions: 0.015 to 0.150/μm2 (2) (Area S5 of regions comprised of anchoring oxide layer regions and Al concentrated regions)/(area S3 of Al concentrated regions)≥0.30, (3) Distance H5 of mean value of heights in thickness direction of regions of comprised of anchoring oxide layer regions and Al concentrated regions minus HO: 0.4 to 4.0 μm, (4) (Perimeter L5 of regions comprised of anchoring oxide layer regions and Al concentrated regions)/(observed area S0): 0.020 to 0.500 μm/μ2, and (5) (Area S1 of anchoring oxide layer regions)/(observed area S0)≥0.15.

公开(公告)号：US20230243013A1

公开(公告)日：2023-08-03

申请号：US18009919

申请日：2021-06-23

Applicant: NIPPON STEEL CORPORATION

Inventor： Nobusato MORISHIGE ,  Kazumi MIZUKAMI ,  Ryutaro YAMAGATA ,  Takashi KATAOKA ,  Haruhiko ATSUMI ,  Daisuke ITABASHI ,  Junichi TAKAOBUSHI

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  H01F1/147 ,  H01F41/00

CPC classification number: C21D9/46 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D8/1283 ,  C21D8/1255 ,  C22C38/60 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D8/1261 ,  H01F1/14775 ,  H01F41/00 ,  C21D2201/05 ,  C22C2202/02

Abstract: A new and improved method for producing grain-oriented electrical steel sheet enabling production of grain-oriented electrical steel sheet realizing high magnetic flux density and excellent in magnetic characteristics, that is, as one aspect, a method for producing grain-oriented electrical steel sheet comprising a hot rolling process, cold rolling process, primary recrystallization annealing process, finish annealing process, and flattening annealing process, wherein shot blasting treatment and/or leveling treatment and treatment for contact with a solution are performed, the solution contains Cu etc. in a predetermined amount, the pH is −1.5 or more and less than 7, a solution temperature is 15° C. or more and 100° C. or less, and the time during which the steel sheet is dipped in the solution is 5 seconds or more and 200 seconds or less.

公开(公告)号：US20220098688A1

公开(公告)日：2022-03-31

申请号：US17421562

申请日：2020-01-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Ryutaro YAMAGATA ,  Nobusato MORISHIGE ,  Takashi KATAOKA ,  Masaru TAKAHASHI

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  H01F1/147

Abstract: Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of a primary coating to the steel sheet is provided. The grain-oriented electrical steel sheet is provided with a base steel sheet having a chemical composition containing C: 0.005% or less, Si: 2.5 to 4.5%, Mn: 0.050 to 1.000%, a total of S and Se: 0.005% or less, sol. Al: 0.005% or less, and N: 0.005% or less and having a balance of Fe and impurities and a primary coating having Mg2 SiO4 as a main constituent formed on a surface of the base steel sheet. A peak position of Al emission intensity obtained when conducting elemental analysis by glow discharge spectrometry from a surface of the primary coating in a thickness direction is present in a range of 2.0 to 12.0 μm from a surface of the primary coating to the thickness direction. A sum of perimeters of the Al oxides at the peak position of Al emission intensity is 0.20 to 1.00 μm/μm2, and a number density of Al oxides is 0.02 to 0.20/μm2.

公开(公告)号：US20220002831A1

公开(公告)日：2022-01-06

申请号：US17421309

申请日：2020-01-08

Applicant: NIPPON STEEL CORPORATION

Inventor： Nobusato MORISHIGE ,  Ryutaro YAMAGATA ,  Ichiro TANAKA ,  Takashi KATAOKA ,  Haruhiko ATSUMI ,  Yoshihiro SUWA ,  Kazumi MIZUKAMI

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

Abstract: Grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties is provided. The method for manufacturing grain-oriented electrical steel sheet excellent in coating adhesion and magnetic properties includes a process of heating to 1280° C. or more and hot rolling a slab containing, by mass %, Bi and a predetermined composition of constituents and having a balance of Fe and impurities so as to obtain hot rolled steel sheet, a process, after hot rolling annealing the hot rolled steel sheet, of cold rolling it one time or cold rolling it two times or more with process annealing performed interposed so as to obtain cold rolled steel sheet, a process of rapidly heating then decarburization annealing the steel sheet, a process of coating the surface of the cold rolled steel sheet after decarburization annealing with an annealing separator containing predetermined compounds including sulfates or sulfides and having MgO as its main constituent, then performing finish annealing, a process of performing strictly controlled finish annealing, and a process of coating an insulating coating, then performing flattening annealing.

公开(公告)号：US20250043381A1

公开(公告)日：2025-02-06

申请号：US18922115

申请日：2024-10-21

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryutaro YAMAGATA ,  Ichiro TANAKA

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

Abstract: An annealing separator used for manufacture of the grain-oriented electrical steel sheet according to the present invention contains MgO, at least one or more types of compounds of metal selected from a group comprised of Y, La, and Ce, and at least one or more types of compounds of metal selected from a group comprised of Ti, Zr, and Hf, when a content of the MgO in the annealing separator is defined as 100% by mass %, a total content of the compounds of metal selected from a group comprised of Y, La, and Ce converted to oxides is 0.5 to 6.0% and a total content of the compounds of metal selected from a group comprised of Ti, Zr, and Hf converted to oxides is 0.8 to 10.0%, a mean particle size of the compounds of metal selected from a group comprised of Y, La, and Ce is 10 μm or less, a ratio of a mean particle size of the compounds of metal selected from a group of Ti, Zr, and Hf to the mean particle size of the compounds of metal selected from a group comprised of Y, La, and Ce is 0.1 to 3.0, a total of a total content of the compounds of metal selected from a group comprised of Y, La, and Ce converted to oxides and a total content of the compounds of metal selected from a group comprised of Ti, Zr, and Hf converted to oxides is 2.0 to 12.5%, a ratio of a sum of the numbers of Ti, Zr, and Hf atoms and a sum of the numbers of Y, La, and Ce atoms contained in the annealing separator is 0.15 to 3.6, further a number density of particles of the compounds of metal selected from the group comprised of Y, La, and Ce which are particles of a spherical equivalent diameter based on volume of 0.1 μm or more is 2,000,000,000/g or more, and further a number density of particles of the compounds of metal selected from the group comprised of Ti, Zr, and Hf which are particles of a spherical equivalent diameter based on volume of 0.1 μm or more is 2,000,000,000/g or more.

公开(公告)号：US20250019788A1

公开(公告)日：2025-01-16

申请号：US18897469

申请日：2024-09-26

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryutaro YAMAGATA ,  Ichiro TANAKA

IPC: C21D9/46 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C23C28/04

Abstract: An annealing separator used for manufacture of the grain-oriented electrical steel sheet according to the present invention contains MgO, at least one or more types of compounds of metal selected from a group comprised of Y, La, and Ce, and at least one or more types of compounds of metal selected from a group comprised of Ti, Zr, and Hf, wherein when a content of the MgO in the annealing separator is defined as 100% by mass %, a total content of the compounds of metal selected from a group comprised of Y, La, and Ce converted to oxides is 0.5 to 8.0%, a total content of the compounds of metal selected from a group comprised of Ti, Zr, and Hf converted to oxides is 0.5 to 10.0%, further, a total of a total content of the compounds of metal selected from a group comprised of Y, La, and Ce converted to oxides and a total content of the compounds of metal selected from a group comprised of Ti, Zr, and Hf converted to oxides is 2.0 to 14.0%, further a ratio of a sum of the numbers of Y, La, and Ce atoms with respect to a sum of the numbers of Ti, Zr, and Hf atoms contained in the annealing separator is 0.15 to 4.00, further a number density of particles of the compounds of metal selected from the group comprised of Y, La, and Ce which are particles of a spherical equivalent diameter based on volume of 0.1 μm or more is 2,000,000,000/g or more, and further a number density of particles of the compounds of metal selected from the group comprised of Ti, Zr, and Hf which are particles of a spherical equivalent diameter based on volume of 0.1 μm or more is 2,000,000,000/g or more.

公开(公告)号：US20230160034A1

公开(公告)日：2023-05-25

申请号：US18096276

申请日：2023-01-12

Applicant: NIPPON STEEL CORPORATION

Inventor： Ichiro TANAKA ,  Ryutaro YAMAGATA ,  Nobusato MORISHIGE ,  Takashi KATAOKA ,  Masaru TAKAHASHI

IPC: C21D9/46 ,  C21D3/04 ,  C21D6/00 ,  C21D8/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/16 ,  H01F1/147

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1272 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/008 ,  C22C38/16 ,  H01F1/147 ,  C22C2202/02

Abstract: Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of a primary coating to the steel sheet is provided. The grain-oriented electrical steel sheet is provided with a base steel sheet having a chemical composition containing C: 0.005% or less, Si: 2.5 to 4.5%, Mn: 0.050 to 1.000%, a total of S and Se: 0.005% or less, sol. Al: 0.005% or less, and N: 0.005% or less and having a balance of Fe and impurities and a primary coating having Mg2 SiO4 as a main constituent formed on a surface of the base steel sheet. A peak position of Al emission intensity obtained when conducting elemental analysis by glow discharge spectrometry from a surface of the primary coating in a thickness direction is present in a range of 2.0 to 12.0 µm from a surface of the primary coating to the thickness direction. A sum of perimeters of the Al oxides at the peak position of Al emission intensity is 0.20 to 1.00 µm/µm2, and a number density of Al oxides is 0.02 to 0.20 /µm2.