公开(公告)号：US11114227B2

公开(公告)日：2021-09-07

申请号：US16065352

申请日：2016-12-14

申请人： JFE STEEL CORPORATION

发明人： Masanori Uesaka ,  Kunihiro Senda ,  Takeshi Omura

IPC分类号： H01F1/16 ,  C21D8/12 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/14 ,  C22C38/60 ,  C22C38/06 ,  H01F1/147 ,  C21D9/46 ,  C21D1/76

摘要： A non-oriented electrical steel sheet has low iron loss even under inverter excitation and can be suitably used as the iron core of a motor. The non-oriented electrical steel sheet has a specific chemical composition and an average grain size r of 40 μm to 120 μm. An area ratio R of a total area of grains having a grain size of ⅙ or less of the thickness of the steel sheet to a cross-sectional area of the steel sheet is 2% or greater, and the average grain size r (μm) and the area ratio R (%) satisfy a condition represented by Expression (1), R>−2.4×r+200 (1).

公开(公告)号：US11091842B2

公开(公告)日：2021-08-17

申请号：US16342829

申请日：2017-10-17

申请人： JFE Steel Corporation

发明人： Takumi Umada ,  Shigehiro Takajo ,  Takashi Terashima ,  Minoru Takashima ,  Yasuyuki Hayakawa

IPC分类号： C23F17/00 ,  C23C14/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C22C38/60 ,  C23D5/02 ,  C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C21D3/04 ,  H01F1/18 ,  B32B15/04 ,  C23C28/04 ,  C23C14/00 ,  C23C14/22 ,  C23C16/36 ,  C23C16/34 ,  C23C16/32

摘要： Provided are: an oriented electromagnetic steel sheet with outstanding coating adhesion and magnetic properties after stress relief annealing; and a method for manufacturing the oriented electromagnetic steel sheet. The oriented electromagnetic steel sheet comprises: a steel sheet; a non-oxide ceramic coating disposed on the steel sheet and containing a non-oxide; and an insulating tensile coating disposed on the non-oxide ceramic coating and containing an oxide. The thickness of the non-oxide ceramic coating is 0.020-0.400 μm. The thickness of the insulating tensile coating is at least 1.0 μm. The chromium content on the steel plate side of the non-oxide ceramic coating is less than 25 atomic %, and the chromium content on the insulating tensile coating side of the non-oxide ceramic coating is at least 25 atomic %.

公开(公告)号：US20210246524A1

公开(公告)日：2021-08-12

申请号：US17263846

申请日：2019-07-31

申请人： NIPPON STEEL CORPORATION

发明人： Shuichi NAKAMURA ,  Yusuke KAWAMURA ,  Shingo OKADA ,  Tomoaki ITO ,  Shinya YANO

IPC分类号： C21D8/12 ,  H01F1/147 ,  C21D9/46 ,  C22C38/02 ,  C22C38/00 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

摘要： A grain oriented electrical steel sheet includes the texture aligned with Goss orientation. In the grain oriented electrical steel sheet, when (α1 β1 γ1) and (α2 β2 γ2) represent deviation angles of crystal orientations measured at two measurement points which are adjacent on the sheet surface and which have an interval of 1 mm, the boundary condition BA is defined as |β2−β1|≥0.5°, and the boundary condition BB is defined as [(α2−α1)2+(β2−β1)2+(γ2−γ1)2]1/2≥2.0°, the boundary which satisfies the boundary condition BA and which does not satisfy the boundary condition BB is included.

公开(公告)号：US11072838B2

公开(公告)日：2021-07-27

申请号：US16072167

申请日：2016-12-26

申请人： POSCO

发明人： Seung Ho Lim ,  Do Ryun Lee ,  Jin Ho Kim ,  Myung Sik Chun ,  Gyoo Taek Lee ,  Seong Cheol Hong

IPC分类号： C21D9/56 ,  B23K26/08 ,  B23K26/14 ,  C21D6/00 ,  C21D10/00 ,  B23K26/354 ,  B23K26/364 ,  C21D8/12 ,  B23K26/142 ,  B23K37/047 ,  B23K26/12 ,  B23K26/03 ,  B23K26/40 ,  B23K26/359 ,  B23K26/04 ,  B23K26/082 ,  B23K26/70 ,  B23K103/04 ,  B23K101/16

摘要： To optimize equipment and processes to enhance magnetic domain refinement efficiency and to enhance workability to improve processing capability, a method of refining a magnetic domain of a grain-oriented electrical steel plate includes zigzag controlling for transferring the steel plate without being inclined in right and left directions along a production line center, steel plate support roll position adjusting for controlling a position of the steel plate in up and down directions while supporting the steel plate, laser beam irradiating for irradiating a laser beam to a surface of the steel plate to melt the steel plate to form a groove in the surface of the steel plate, and removing for absorbing and removing radiant heat due to reflection of the laser beam irradiated to the surface of the steel plate during the laser beam irradiating.

公开(公告)号：US20210071280A1

公开(公告)日：2021-03-11

申请号：US16958195

申请日：2018-12-17

申请人： POSCO

发明人： Kyu-Seok HAN ,  Jae Kyoum KIM ,  Chang Soo PARK ,  Jin-Wook SEO ,  Jong-Tae PARK

IPC分类号： C21D9/46 ,  C21D8/12 ,  C21D6/00 ,  C22C38/60 ,  C22C38/22 ,  C22C38/20 ,  C22C38/32 ,  C22C38/34 ,  C22C38/04 ,  C22C38/00 ,  H01F1/147

摘要： A grain-oriented electrical steel sheet according to an embodiment of the present invention contains, in a unit of wt %, Si at 2.0 wt % to 4.5 wt %, C at 0.005 wt % or less (excluding 0 wt %), Mn at 0.001 wt % to 0.08 wt %, P at 0.001 wt % to 0.1 wt %, Cu at 0.001 wt % to 0.1 wt %, S at 0.0005 wt % to 0.05 wt %, Se at 0.0005 wt % to 0.05 wt %, B at 0.0001 wt % to 0.01 wt %, Mo at 0.01 wt % to 0.2 wt %, and the remainder of Fe and inevitable impurities. A sum amount of S and Se is 0.005 to 0.05 wt %.

公开(公告)号：US20210054472A1

公开(公告)日：2021-02-25

申请号：US16957522

申请日：2018-12-06

申请人： POSCO

发明人： Sang-Won LEE ,  Min-Serk KWON ,  Jin-Su BAE

IPC分类号： C21D8/12 ,  C23C16/453 ,  C23C16/40 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

摘要： Provided is a method for producing an oriented electrical steel sheet with an ultra-low iron loss.
The method for producing an oriented electrical steel sheet according to the present disclosure comprises: a step of preparing an oriented electrical steel sheet; and a step of forming a ceramic coating layer by subjecting a gas-phase ceramic precursor to a contact reaction in a plasma state using the atmospheric pressure plasma CVD (APP-CVD) process, on a part of or the entire one or both surfaces of the electrical steel sheet.

公开(公告)号：US10907234B2

公开(公告)日：2021-02-02

申请号：US15768696

申请日：2016-10-26

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroshi Fujimura ,  Fumiaki Takahashi ,  Takashi Kataoka

IPC分类号： C21D9/46 ,  C22C38/16 ,  H01F1/18 ,  C21D8/12 ,  C22C38/60 ,  H01F1/16 ,  C21D3/04 ,  C21D6/00 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C23G1/08

摘要： A grain-oriented electrical steel sheet includes: a chemical composition represented by, in mass %, Si: 1.8% to 7.0%, Cu: 0.03% to 0.60%, and the balance: Fe and impurities; and a primary coating film containing forsterite on a surface of the steel sheet, in which a Cu/Fe light-emitting intensity ratio at an interface region between the primary coating film and the surface of the steel sheet is 0.30 or less.

公开(公告)号：US10815545B2

公开(公告)日：2020-10-27

申请号：US15539960

申请日：2015-12-21

申请人： POSCO

发明人： Oh-Yeoul Kwon ,  Won-Gul Lee ,  Seong-Cheol Hong ,  Gyoo-Taek Lee ,  Jong-Tae Park ,  Choong Soo Lim

IPC分类号： B23K26/364 ,  C21D8/12 ,  C23C8/26 ,  C22C38/02 ,  C23C8/02 ,  B23K26/0622 ,  C23C8/80 ,  B23K26/08 ,  C22C38/00 ,  C22C38/06 ,  C22C38/04 ,  C21D9/46 ,  C23C8/18 ,  B23K103/04 ,  B23K101/36 ,  B23K101/18 ,  B23K101/34 ,  B23K101/16

摘要： A grain-oriented electrical steel plate of an exemplary embodiment of the present invention has a groove formed on a surface, wherein a curvature radius RBb at a position where a depth of the groove is maximum is 0.2 μm to 100 μm, and a curvature radius RSb on the groove surface from the position where the depth of the groove is maximum to a quarter-way position of the depth D of the groove is 4 μm to 130 μm.

公开(公告)号：US20200291507A1

公开(公告)日：2020-09-17

申请号：US16809919

申请日：2020-03-05

申请人： TDK CORPORATION

发明人： Kensuke ARA ,  Hajime AMANO

IPC分类号： C22C38/10 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C21D8/12

摘要： Provided is a soft magnetic alloy comprising a composition formula (Fe(1−(α+β))X1αX2β)(1−(a+b+c+d+e+f))MaBbPcSidCeZnf. X1 denotes at least one selected from Co and Ni; X2 denotes at least one selected from Cu, Mg, Al, Mn, Ag, Sn, Bi, O, N, S, and rare earth elements; M denotes at least one selected from Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W; 0.080≤b≤0.150, 0≤c≤0.060, 0≤d≤0.060, 0≤e≤0.030, 0.0030≤f≤0.080, 0.0030≤a+f≤0.080, b+c≥0.100, α≥0, β≥0, and 0≤α+β≤0.50 are satisfied; and the soft magnetic alloy has Fe-based nanocrystals with a bcc structure.

公开(公告)号：US20200283863A1

公开(公告)日：2020-09-10

申请号：US16648663

申请日：2018-09-25

申请人： JFE STEEL CORPORATION

发明人： Kunihiro SENDA ,  Makoto WATANABE ,  Seiji OKABE ,  Souichiro YOSHIZAKI

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

摘要： Further lower iron loss can be achieved in a grain-oriented electrical steel sheet including: a predetermined film mainly composed of forsterite on a front and back surfaces thereof; and a plurality of grooves on the front surface thereof, in which the plurality of grooves have an average depth of 6% or more of a thickness of the steel sheet and are spaced a distance of 1 mm to 15 mm from respective adjacent grooves, the steel sheet has a specific magnetic permeability μr15/50 of 35000 or more when subjected to alternating current magnetization at a frequency of 50 Hz and a maximum magnetic flux density of 1.5 T, and the steel sheet includes isolated parts having a presence frequency of 0.3/μm or less, the isolated parts being separated from a continuous part of the film in an interface between the steel sheet and the film in a cross section orthogonal to the rolling direction of the steel sheet.