公开(公告)号：US20230357875A1

公开(公告)日：2023-11-09

申请号：US18246334

申请日：2021-07-02

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Takeshi OMURA

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

CPC classification number: C21D8/1277 ,  C21D9/46 ,  C21D8/1261 ,  C21D8/1222 ,  C21D8/1233 ,  C21D6/008 ,  C21D6/005 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D2201/05 ,  C22C2202/02 ,  H01F1/14775

Abstract: A method for forming grooves on a surface of a metal strip, having applying a coating agent for etching resist coating formation to a roller; then, irradiating a laser on the roller while scanning the laser in an axial direction of the roller or in a direction inclined to the axial direction to remove a portion of the coating agent for etching resist coating formation irradiated by the laser; then, bringing the roller into contact with at least one side of the metal strip to transfer the coating agent for etching resist coating formation to the at least one side of the metal strip, with an unapplied area corresponding to the removed portion of the coating agent for etching resist coating formation.

公开(公告)号：US20230250506A1

公开(公告)日：2023-08-10

申请号：US18003339

申请日：2021-06-29

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke SHIMOYAMA ,  Yukihiro SHINGAKI ,  Takashi TERASHIMA

IPC: C21D9/46 ,  C21D3/04 ,  C21D8/12 ,  C21D1/42 ,  C21D6/00 ,  C22C38/60 ,  C22C38/32 ,  C22C38/22 ,  C22C38/20 ,  C22C38/34 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  C21D3/04 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1266 ,  C21D8/1272 ,  C21D1/42 ,  C21D8/1283 ,  C21D6/005 ,  C21D6/008 ,  C21D6/001 ,  C21D6/002 ,  C22C38/60 ,  C22C38/32 ,  C22C38/22 ,  C22C38/20 ,  C22C38/34 ,  C22C38/16 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C22C38/001 ,  C21D2201/05 ,  C22C2202/02

Abstract: Provided is a method of manufacturing a grain-oriented electrical steel sheet with which a grain-oriented electrical steel sheet with excellent magnetic properties and little variation in iron loss in the longitudinal direction of a coil can be stably manufactured. The method includes subjecting a steel slab to hot-rolling and optionally to annealing, then performing cold rolling once or twice or more to obtain a cold-rolled sheet with a final sheet thickness, and then subjecting the cold-rolled sheet to decarburization annealing and then secondary recrystallization annealing, where immediately before final cold rolling, a steel sheet is heated at a heating rate of 100° C./s or more to a heating temperature of 100° C. or higher and 350° C. or lower, and a time from when the steel sheet reaches the heating temperature to when it is bitten in a first pass of final cold rolling is set to within 5 seconds.

公开(公告)号：US20190233926A1

公开(公告)日：2019-08-01

申请号：US16312222

申请日：2017-08-04

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Kohichi SANO ,  Makoto UNO ,  Ryoichi NISHIYAMA ,  Yuji YAMAGUCHI ,  Natsuko SUGIURA ,  Masahiro NAKATA

IPC: C22C38/38 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C22C38/26 ,  C22C38/28 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/08 ,  C22C38/04 ,  C23C2/06 ,  C23C2/40

CPC classification number: C22C38/38 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C21D2201/05 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/58 ,  C23C2/06 ,  C23C2/40

Abstract: A steel sheet has a specific chemical composition and has a structure represented by, by area ratio, ferrite: 5 to 95%, and bainite: 5 to 95%. When a region that is surrounded by a grain boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 μm or more is defined as a crystal grain, the proportion of crystal grains each having an intragranular misorientation of 5 to 14° to all crystal grains is 20 to 100% by area ratio. Hard crystal grains A in which precipitates or clusters with a maximum diameter of 8 nm or less are dispersed in the crystal grains with a number density of 1×1016 to 1×1019 pieces/cm3 and soft crystal grains B in which precipitates or clusters with a maximum diameter of 8 nm or less are dispersed in the crystal grains with a number density of 1×1015 pieces/cm3 or less are contained, and the volume % of the hard crystal grains A/(the volume % of the hard crystal grains A +the volume % of the soft crystal grains B) is 0.1 to 0.9.

公开(公告)号：US10020101B2

公开(公告)日：2018-07-10

申请号：US14367654

申请日：2012-12-21

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro Takajo ,  Seiji Okabe

IPC: H01F1/16 ,  C21D8/12 ,  C22C38/00 ,  C21D1/38 ,  C21D1/34

CPC classification number: H01F1/16 ,  C21D1/34 ,  C21D1/38 ,  C21D8/12 ,  C21D8/1244 ,  C21D8/1294 ,  C21D2201/05 ,  C22C38/00

Abstract: Disclosed is a grain-oriented electrical steel sheet exhibiting low hysteresis loss and low coercive force, in which an increase in hysteresis loss due to laser irradiation or electron beam irradiation, which has been a conventional concern, is effectively inhibited. The grain-oriented electrical steel sheet has closure domain regions (X) formed to divide the magnetic domains in a rolling direction, from one end to the other in the width direction of the steel sheet, provided that Expression (1) is satisfied: −(500t−80)×s+230≤w≤−(500t−80)×s+330   Expression (1), where t represents a sheet thickness (mm); w represents a smaller one of the widths (μm) of the regions measured on the front and rear surfaces of the steel sheet, respectively, by using a Bitter method; and s represents an average number of the regions present within one crystal grain.

公开(公告)号：US09997283B2

公开(公告)日：2018-06-12

申请号：US14963625

申请日：2015-12-09

Applicant: POSCO

Inventor： Kyu-Seok Han ,  Jae-Soo Lim ,  Byung-Deug Hong ,  Chan-Hee Han

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C21D8/12 ,  H01F1/147 ,  H01F1/16 ,  H01F1/01 ,  C22C38/00 ,  C30B29/52

CPC classification number: H01F1/01 ,  C21D8/12 ,  C21D8/1244 ,  C21D8/1272 ,  C21D2201/05 ,  C21D2211/004 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C30B29/52

Abstract: Provided is a grain-oriented electric steel sheet having superior magnetic property and to a grain-oriented electric steel sheet including 2.0 to 4.5 weight % of Si, 0.001 to 0.10 weight % of C, 0.010 weight % or lower of Al, 0.08 weight % or lower of Mn, 0.005 weight % or lower of N, 0.002 to 0.050 weight % of S, the remainder being Fe and other unavoidable impurities. The steel sheet having been subjected to secondary recrystallization using at least any one of grain boundary-segregated elementary S and an FeS precipitate as a grain growth inhibitor.

公开(公告)号：US20180119242A1

公开(公告)日：2018-05-03

申请号：US15529141

申请日：2015-12-10

Applicant: JFE STEEL CORPORATION

Inventor： Hirokazu KOBAYASHI

IPC: C21D8/12 ,  C25F3/06 ,  C25F3/14 ,  H01F1/16 ,  G03F7/40 ,  B23K26/364

CPC classification number: C21D8/1294 ,  B23K26/082 ,  B23K26/0846 ,  B23K26/18 ,  B23K26/364 ,  B23K26/40 ,  B23K2101/16 ,  B23K2103/04 ,  C21D8/12 ,  C21D8/1255 ,  C21D10/00 ,  C21D2201/05 ,  C25F3/06 ,  C25F3/14 ,  G03F7/40 ,  H01F1/16

Abstract: A resist coating for etching use which enables high speed and high accuracy patterning is provided by applying, to a cold rolled steel strip, a positive resist ink which solubilizes upon exposure to light; then drying the positive resist ink to form a resist coating; then scanning a laser beam converged in a point shape in the width direction of the cold rolled steel strip to form a photosensitive portion; and then removing the photosensitive portion of the resist film with a developing solution. Subsequently, by dissolving and removing by etching a portion of the steel strip below the removed portion of the resist coating, a fine and uniform linear groove can be formed in a surface of the steel strip.

公开(公告)号：US09905361B2

公开(公告)日：2018-02-27

申请号：US14430463

申请日：2012-12-11

Applicant: BAOSHAN IRON & STEEL CO., LTD.

Inventor： Kanyi Shen ,  Guobao Li ,  Shuangjie Chu ,  Yezhong Sun ,  Huabing Zhang ,  Yongjie Yang ,  Zhuochao Hu ,  Bin Zhao ,  Qi Xu ,  Jie Huang ,  Peili Zhang

IPC: H01F41/02 ,  C21D8/12 ,  C22C38/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  H01F1/18 ,  C21D3/04 ,  C21D6/00 ,  C23C8/26 ,  H01F1/147 ,  H01F41/32

CPC classification number: H01F41/02 ,  C21D3/04 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1205 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D8/1272 ,  C21D8/1277 ,  C21D8/1283 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C8/26 ,  H01F1/14783 ,  H01F1/14791 ,  H01F1/18 ,  H01F41/32

Abstract: A manufacturing method of oriented silicon steel with magnetic induction B8 of not less than 1.88 T, comprising the following steps: 1) smelting and continuous casting to obtain a slab, wherein the content of N is controlled at 0.002-0.014 wt % in the smelting stage; 2) hot-rolling; 3) cold-rolling; 4) decarbonizing and annealing; 5) nitriding treatment, wherein infiltrated nitrogen content [N]D is controlled to satisfy the formula: 328−0.14a−0.85b−2.33c≦[N]D≦362−0.16a−0.94b−2.57c, wherein a is the content of Als in the smelting step, with the unit of ppm; b is the content of N element, with the unit of ppm; and c is primary grains size, with the unit of μm; 6) coating a steel's surfaces with a magnesium oxide layer and annealing; and 7) applying an insulating coating.

公开(公告)号：US20180043474A1

公开(公告)日：2018-02-15

申请号：US15549784

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Hideyuki HAMAMURA ,  Tatsuhiko SAKAI ,  Fumiaki TAKAHASHI ,  Hisashi MOGI ,  Shunsuke OKUMURA ,  Hirofumi IMAI

IPC: B23K26/364 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B23K26/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  B05D3/02 ,  B05D7/14 ,  C22C38/42 ,  C21D9/46

CPC classification number: B23K26/364 ,  B05D3/0254 ,  B05D7/14 ,  B23K26/359 ,  C21D3/04 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D7/00 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1255 ,  C21D8/1261 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C2202/02 ,  C25F1/00 ,  H01F1/16

Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. When an average value of a groove depth in a sheet thickness direction at a central portion of the groove in a longitudinal groove direction is set as an average groove depth D, a straight line, which connects a first point at which a groove depth in the sheet thickness direction becomes 0.05×D and a second point at which the groove depth becomes 0.50×D, at an inclined portion of the groove is set as a groove end straight line, an angle made by the steel sheet surface and the groove end straight line is set as a first angle θ, and an average value of a groove-width-direction length, which is a length of a line segment connecting two points at which a groove depth in the sheet thickness direction in a contour of the groove on the groove-width-direction cross-section becomes 0.05×D, is set as an average groove width W, an aspect ratio A obtained by dividing the average groove depth D by the average groove width W, and the first angle θ satisfy the following Expression (1). θ

公开(公告)号：US20180037965A1

公开(公告)日：2018-02-08

申请号：US15552297

申请日：2016-02-12

Applicant: JFE STEEL CORPORATION

Inventor： Shigehiro TAKAJO ,  Takeshi OMURA ,  Seiji OKABE

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

CPC classification number: C21D8/1294 ,  C21D8/12 ,  C21D8/1288 ,  C21D9/46 ,  C21D2201/05 ,  H01F1/16 ,  H01F27/245

Abstract: Disclosed are a grain-oriented electrical steel sheet having strain regions extending in a direction transverse to a rolling direction at periodic interval s (mm) in the rolling direction. Each strain region has a closure domain region whose width in the rolling direction varies periodically on a steel sheet surface. Each closure domain region satisfies: Wmax/Wmin=1.2 or more and less than 2.5, where Wmax and Wmin respectively denote a maximum width and a minimum width on the steel sheet surface as measured in the rolling direction; Wave being 80 μm or more, where Wave denotes an average width on the steel sheet surface as measured in the rolling direction; D being 32 μm or more, where D denotes a maximum depth as measured in the sheet thickness direction; and (Wave*D)/s being 0.0007 mm or more and 0.0016 mm or less.

公开(公告)号：US20180022927A1

公开(公告)日：2018-01-25

申请号：US15545760

申请日：2016-02-02

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Kazutoshi TAKEDA ,  Kenji KOSUGE ,  Tatsuya TAKASE ,  Koji MUNEDA

IPC: C09D1/00 ,  C22C38/04 ,  B05D1/06 ,  B05D7/14 ,  B05D3/02 ,  C22C38/06 ,  C22C38/02

CPC classification number: C09D1/00 ,  B05D1/06 ,  B05D3/0254 ,  B05D7/14 ,  C08L27/00 ,  C08L33/00 ,  C09D5/00 ,  C09D7/40 ,  C21D8/1283 ,  C21D2201/05 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C2202/02 ,  C23C22/34 ,  C23C22/36 ,  C23C2222/20 ,  H01F1/18

Abstract: An electrical steel sheet has an insulating coating on a steel sheet surface. The insulating coating includes one or more selected from an inorganic salt, an oxide, and an organic resin. The insulating coating includes the inorganic salt and/or the oxide in an amount of 50% or more by mass in total based on the total mass of the insulating coating. The insulating coating has a fluorine concentration ranging from 2 ppm to 130 ppm. The insulating coating is free of a chromium compound. The insulating coating of this electrical steel sheet has excellent coating compatibility.