公开(公告)号：US11875934B2

公开(公告)日：2024-01-16

申请号：US16423516

申请日：2019-05-28

Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

Inventor： Jian-Ping Wang ,  Md Mehedi ,  YanFeng Jiang ,  Bin Ma ,  Delin Zhang ,  Fan Zhang ,  Jinming Liu

IPC: C01B21/06 ,  H01F1/10 ,  C22C38/00 ,  H01F41/02 ,  H01F1/03 ,  C22C38/06 ,  H01F1/00 ,  C22C38/16

CPC classification number: H01F41/0253 ,  C01B21/0622 ,  H01F1/10 ,  C21D2201/05 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/06 ,  C22C38/16 ,  C22C2200/04 ,  C22C2202/02 ,  H01F1/0009 ,  H01F1/03

Abstract: The disclosure is directed to an iron-nitride material having a polycrystalline microstructure including a plurality of elongated crystallographic grains with grain boundaries, the iron-nitride material including at least one of an α″-Fe16N2 phase and a body-center-tetragonal (bct) phase comprising Fe and N. The disclosure is also directed a method producing an iron-nitride material. The method includes some combinations of preparing a raw material comprising iron, carrying out a microstructure build-up by annealing the prepared raw material at an elevated temperature and subsequently quenching the prepared raw material to produce a microstructure build-up material, annealing the microstructure build-up material, reducing the microstructure build-up material in a hydrogen environment, nitriding the reduced material to produce a nitrided material and subsequently quenching the nitrided material to a martensitic transformation temperature, stress annealing the nitrided material, and magnetic field annealing the stress-annealed material.

公开(公告)号：US11788168B2

公开(公告)日：2023-10-17

申请号：US16963728

申请日：2019-01-23

Applicant: ThyssenKrupp Steel Europe AG ,  thyssenkrupp AG

Inventor： Sebastian Sieron ,  Philipp Szary ,  Olaf Fischer ,  Abdullah Kahveci ,  Karl Telger

IPC: C22C38/04 ,  C21D9/52 ,  C21D6/00 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  H01F1/147 ,  C21D9/46

CPC classification number: C21D9/52 ,  C21D6/005 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1261 ,  C21D9/46 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  H01F1/147 ,  C21D2201/05

Abstract: The present disclosure provides a non-grain-oriented electrical steel strip which can be used in electric machines such as electric motors and generators. In examples, the non-grain oriented electrical steel strip can be used as a stator having good magnetic properties and as a rotor having good mechanical properties. A reference heat treatment performed subsequent to an initial final heat treatment makes it possible to obtain improved magnetic properties.

公开(公告)号：US20230323497A1

公开(公告)日：2023-10-12

申请号：US18042299

申请日：2021-08-25

Applicant: JFE STEEL CORPORATION

Inventor： Takashi TERASHIMA ,  Karin SHIROYANAGI

IPC: C21D8/12

CPC classification number: C21D8/1283 ,  C21D8/1272 ,  C21D2201/05

Abstract: Provided is a powder for annealing separator that is used for a grain-oriented electrical steel sheet and enables obtainment of a grain-oriented electrical steel sheet having excellent magnetic properties as a result of favorable purification of impurities in steel. The powder for annealing separator contains magnesium oxide as a main component, and has a nitrogen gas permeability of 0.020 cm/s or more and 0.50 cm/s or less in a state of being applied between coiled steel sheets before start of secondary recrystallization.

公开(公告)号：US11753691B2

公开(公告)日：2023-09-12

申请号：US17263840

申请日：2019-07-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Shuichi Nakamura ,  Yusuke Kawamura

IPC: C21D8/12 ,  C21D9/46 ,  C22C38/02 ,  C22C38/00 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

CPC classification number: C21D8/1244 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1283 ,  C21D9/46 ,  C22C38/004 ,  C22C38/02 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C21D2201/05

Abstract: 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 |γ2−γ1|≥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：US10066286B2

公开(公告)日：2018-09-04

申请号：US14761707

申请日：2014-02-18

Applicant: JFE STEEL CORPORATION

Inventor： Hiroshi Matsuda ,  Hideyuki Takahashi ,  Hiroi Yamaguchi ,  Yasuyuki Hayakawa ,  Takashi Terashima ,  Yuiko Wakisaka

IPC: C23C8/38 ,  C21D8/12 ,  C21D9/46 ,  H01F1/16 ,  C23C8/02 ,  C22C38/02 ,  C23C8/26 ,  H01F1/147 ,  C21D1/773 ,  C21D1/09

CPC classification number: C23C8/38 ,  C21D1/09 ,  C21D1/773 ,  C21D8/12 ,  C21D8/1255 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/02 ,  C23C8/02 ,  C23C8/26 ,  H01F1/14775 ,  H01F1/16

Abstract: Provided is an apparatus for continuously nitriding a strip continuously being fed after cold rolling and before secondary recrystallization annealing in a production line of a grain-oriented electrical steel sheet, comprising: a nitriding zone for nitriding the strip; a cooling zone for cooling the strip; and an optional heating zone provided upstream of the nitriding zone for heating the strip, wherein, the nitriding zone is provided with glow discharge electrodes, and by plasma nitriding the strip by glow discharge with the glow discharge electrodes functioning as positive electrodes and the strip functioning as a negative electrode, inhibitor forming elements are uniformly dispersed over the full length and full width of the strip and a grain-oriented electrical steel sheet with excellent magnetic properties with no variation is obtained.

公开(公告)号：US09988704B2

公开(公告)日：2018-06-05

申请号：US15429819

申请日：2017-02-10

Applicant: DOWA THERMOTECH CO., LTD. ,  HONDA MOTOR CO., LTD.

Inventor： Yuichiro Shimizu ,  Atsushi Kobayashi ,  Susumu Maeda ,  Masao Kanayama ,  Kiyotaka Akimoto

IPC: C23C8/48 ,  C23C8/26 ,  C21D1/06 ,  C21D1/74 ,  C21D1/76 ,  C21D9/32 ,  C22C38/22 ,  C22C38/44 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C23C8/26 ,  C21D1/06 ,  C21D1/74 ,  C21D1/76 ,  C21D9/32 ,  C21D2201/05 ,  C21D2221/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/44

Abstract: A manufacturing method of a nitrided steel member and the nitrided steel member include: performing a nitriding treatment on a steel member made of a carbon steel or an alloy steel in an atmosphere of a nitriding treatment gas in which when the total pressure is set to 1, a partial pressure ratio of NH3 gas is set to 0.08 to 0.34, a partial pressure ratio of H2 gas is set to 0.54 to 0.82, and a partial pressure ratio of N2 gas is set to 0.09 to 0.18, at a flow speed of the nitriding treatment gas set to 1 m/s or more, at 500 to 620° C.; and thereby, forming an iron nitride compound layer having a thickness of 2 to 17 μm on a surface of the steel member.

公开(公告)号：US20180036838A1

公开(公告)日：2018-02-08

申请号：US15554659

申请日：2016-04-19

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

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

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

CPC classification number: B23K26/364 ,  C21D8/1294 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/60 ,  C25F3/06 ,  H01F1/14766 ,  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. In a case where the steel sheet surface is seen from the sheet thickness direction, the steel sheet surface is provided with a groove group that is constituted by a plurality of the grooves arranged in a sheet width direction, the grooves, which constitute the groove group, arc arranged in such a manner that adjacent grooves overlap each other on a projection plane perpendicular to the rolling direction, and a plurality of the groove groups are arranged with an interval in the rolling direction.

公开(公告)号：US09875832B2

公开(公告)日：2018-01-23

申请号：US14368654

申请日：2012-12-19

Applicant: JFE STEEL CORPORATION

Inventor： Hiroi Yamaguchi ,  Seiji Okabe ,  Hirotaka Inoue ,  Ryuichi Suehiro

IPC: H01F1/16 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04 ,  C22C38/60 ,  H01F1/18 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C23C22/74 ,  C21D6/00 ,  C21D9/46 ,  C21D10/00

CPC classification number: H01F1/16 ,  C21D6/008 ,  C21D8/12 ,  C21D8/1255 ,  C21D8/1266 ,  C21D8/1283 ,  C21D8/1288 ,  C21D8/1294 ,  C21D9/46 ,  C21D10/00 ,  C21D2201/05 ,  C21D2221/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/60 ,  C23C22/74 ,  H01F1/18

Abstract: Provided is a grain-oriented electrical steel sheet, with reduced iron loss by magnetic domain refining treatment, exhibiting an excellent noise property and effectively reducing noise generated when stacked in an iron core of a transformer. In a grain-oriented electrical steel sheet including a forsterite film and a tension coating on both surfaces, magnetic domain refining treatment has been performed to apply linear thermal strain to the grain-oriented electrical steel sheet, the magnitude of deflection in the rolling direction of the steel sheet is 600 mm or more and 6000 mm or less as the curvature radius of the deflected surface with the surface having the strain applied thereto being the inner side, and the magnitude of deflection in the direction orthogonal to the rolling direction is 2000 mm or more as the curvature radius of the deflected surface with the surface having the strain applied thereto being the inner side.

公开(公告)号：US20180002776A1

公开(公告)日：2018-01-04

申请号：US15541932

申请日：2016-03-10

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Satoshi KANO ,  Takeaki WAKISAKA ,  Ichiro TANAKA

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

CPC classification number: C21D9/46 ,  C21D6/008 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  H01F1/16

Abstract: A non-oriented electrical steel sheet includes C: 0 to 0.0050 mass %, Si: 0.50 to 2.70 mass %, Mn: 0.10 to 3.00 mass %, Al: 1.00 to 2.70 mass %, and P: 0.050 to 0.100 mass %. In the non-oriented electrical steel sheet, Al/(Si+Al+0.5×Mn) is 0.50 to 0.83, Si+Al/2+Mn/4+5×P is 1.28 to 3.90, Si+Al+0.5×Mn is 4.0 to 7.0, the ratio of the intensity of {100} plane I{100} to the intensity of {111} plane I{111} is 0.50 to 1.40, the specific resistance is 60.0×10−8 Ω·m or higher at room temperature, and the thickness is 0.05 mm to 0.40 mm.

公开(公告)号：US20170321296A1

公开(公告)日：2017-11-09

申请号：US15528208

申请日：2015-11-26

Applicant: JFE STEEL CORPORATION

Inventor： Yasuyuki HAYAKAWA ,  Masayasu UENO

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

CPC classification number: C21D9/46 ,  B21B3/02 ,  B21B2001/221 ,  B21B2265/14 ,  B21B2267/10 ,  C21D8/1233 ,  C21D8/1244 ,  C21D8/1255 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1283 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/22 ,  C22C38/34 ,  C22C38/60 ,  H01F1/16

Abstract: Disclosed is a method for manufacturing a grain-oriented electrical steel sheet using an inhibitor-less technique, in which cold rolling includes final cold rolling with a total cold rolling reduction being set to 85% or more and a rolling reduction per pass being set to 32% or more. The final cold rolling includes one or more passes and a final pass succeeding the one or more passes and uses work rolls having a surface roughness Ra of 0.25 μm or less in at least one of the one or more passes other than the final pass. According to this method, it is possible to stably manufacture a grain-oriented electrical steel sheet exhibiting excellent magnetic properties at low cost.