公开(公告)号：US10060006B2

公开(公告)日：2018-08-28

申请号：US15133848

申请日：2016-04-20

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Yoshihiro Suwa ,  Kazuaki Nakano ,  Kunio Hayashi ,  Riki Okamoto ,  Nobuhiro Fujita ,  Kohichi Sano

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/12 ,  C22C38/14 ,  C21D8/04 ,  B32B15/01 ,  C22C38/08 ,  C22C38/10 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/22 ,  C23C2/06 ,  C23C2/28 ,  C23C2/36

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D2201/05 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/105 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C2/06 ,  C23C2/285 ,  C23C2/36 ,  Y10T428/12799

Abstract: This high-strength cold-rolled steel sheet contains, in mass %, C: 0.02% to 0.20%; Si: 0.001% to 2.5%; Mn: 0.01% to 4.0%; P: 0.001% to 0.15%; S: 0.0005% to 0.03%; Al: 0.001% to 2.0%; N: 0.0005% to 0.01%; and O: 0.0005% to 0.01%; in which Si+Al is limited to less than 1.0%, and a balance being composed of iron and inevitable impurities, in which an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100} to {223} orientation group is 4.0 or less, and a pole density of the {332} crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 7 μm or less.

公开(公告)号：US20180237876A1

公开(公告)日：2018-08-23

申请号：US15754143

申请日：2016-08-29

Applicant: THYSSENKRUPP ELECTRICAL STEEL GMBH

Inventor： Christian HECHT ,  Ludger LAHN ,  Carsten SCHEPERS

IPC: C21D8/12 ,  C22C38/16 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00

CPC classification number: C21D8/1266 ,  C21D8/1261 ,  C21D8/1283 ,  C21D8/1288 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/16

Abstract: A method is used to produce a grain-oriented electrical steel strip having optimized magnetic properties. The method may utilize a steel comprising in percent by weight 2.0-4.0% Si, 0.010-0.100% C, at most 0.065% Al, at most 0.02% N, and optionally further constituents, the balance being iron and unavoidable impurities. The steel may be processed to give a cold strip, which may then be subjected to oxidation/primary recrystallization annealing. The resultant cold strip may have an oxide layer to which an annealing separator layer is applied. In a subsequent high-temperature anneal, a forsterite layer forms therefrom, and an insulation layer may be applied thereto prior to a final anneal. After the oxidation/primary recrystallization anneal, a spectrum of the oxide layer obtained is determined by way of FTIR, and an area (Fe2SiO4) is determined for a peak representing Fe2SiO4 molecules present in the oxide layer and is at 980 cm−1, and an area (αSiO2) for a peak representing αSiO2 molecules present in the oxide layer and is at 1250 cm−1. Then the composition of the steel, parameters for the cold rolling, parameters for the oxidation/primary recrystallization anneal, or parameters for a hot strip anneal are adjusted such that 0.5×area (Fe2SiO4)≤area (αSiO2)≤2×area (Fe2SiO4).

公开(公告)号：US10011886B2

公开(公告)日：2018-07-03

申请号：US14347759

申请日：2012-09-28

Applicant: JFE Steel Corporation

Inventor： Shigehiro Takajo ,  Hiroi Yamaguchi ,  Takeshi Omura ,  Hirotaka Inoue ,  Seiji Okabe

IPC: C21D8/12 ,  C22C38/04 ,  C22C38/60 ,  H01F1/16 ,  H01F1/18 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C23C30/00 ,  C21D1/38

CPC classification number: C21D8/1277 ,  C21D1/38 ,  C21D8/12 ,  C21D8/1283 ,  C21D2201/05 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/60 ,  C23C30/00 ,  H01F1/16 ,  H01F1/18

Abstract: A grain-oriented electrical steel sheet to which electron beam irradiation is applied, has a film and a thickness of t (mm), wherein no rust is produced on a surface of the steel sheet after a humidity cabinet test lasting 48 hours at a temperature of 50° C. in an atmosphere of 98% humidity, and iron loss W17/50 after the electron beam irradiation is reduced by at least (−500 t2+200 t−6.5) % of the iron loss W17/50 before the electron beam irradiation and is (5 t2−2 t+1.065) W/kg or less.

公开(公告)号：US09984800B2

公开(公告)日：2018-05-29

申请号：US14368812

申请日：2012-12-28

Applicant: JFE Steel Corporation

Inventor： Shigehiro Takajo ,  Ryuichi Suehiro ,  Hiroi Yamaguchi

IPC: H01F1/147 ,  C21D8/12 ,  C22C38/00 ,  C22C38/60 ,  H01F1/16 ,  C22C38/02 ,  C22C38/04 ,  C21D1/38 ,  C21D1/34

CPC classification number: H01F1/147 ,  C21D1/34 ,  C21D1/38 ,  C21D8/12 ,  C21D8/1294 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/60 ,  H01F1/16

Abstract: A grain-oriented electrical steel sheet allows for manufacture of a transformer that exhibits, when the steel sheet is applied to an iron core thereof, extremely low iron loss and extremely low noise properties, makes highly efficient use of energy, and can be used in various environments. The grain-oriented electrical steel sheet has a strain distribution in regions where closure domains are formed, when observed in a cross section in the rolling direction, with a maximum tensile strain in a sheet thickness direction being 0.45% or less, and with a maximum tensile strain t (%) and a maximum compressive strain c (%) in the rolling direction satisfying Expression (1): t+0.06≤t+c≤0.35  (1).

公开(公告)号：US09970074B2

公开(公告)日：2018-05-15

申请号：US14891889

申请日：2014-07-01

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Kaoru Kawasaki ,  Masaharu Kameda ,  Kohichi Sano ,  Riki Okamoto

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C21D8/04 ,  C21D9/46 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/54 ,  C22C38/12 ,  C21D8/02 ,  B32B15/01 ,  C21D6/00 ,  C22C38/00 ,  C22C38/08 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/004 ,  C21D6/005 ,  C21D6/007 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D8/0473 ,  C21D2201/05 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: A cold-rolled steel sheet includes a predetermined chemical composition, and includes a structure expressed by: an area fraction of ferrite: 95% or more; an area fraction of retained austenite and an area fraction of martensite: 1% to 3% in total; a product of the area fraction of retained austenite and a carbon concentration in retained austenite: 1 or more; a value of I(111)/{I(100)+I(110)} at a region where a depth from a surface is ¼ of a thickness of the cold-rolled steel sheet when intensity of a (hkl) plane is expressed by I(hkl): 2 or less.

公开(公告)号：US20170369959A1

公开(公告)日：2017-12-28

申请号：US15539665

申请日：2015-12-21

Applicant: POSCO

Inventor： Dae Hyun Song

IPC: C21D8/12 ,  C22C38/02 ,  C23C2/12 ,  C23C2/28

CPC classification number: C21D8/12 ,  C21D2201/05 ,  C22C38/02 ,  C23C2/12 ,  C23C2/28

Abstract: The present invention relates to a method of manufacturing a directional electric steel plate having excellent surface wettability and magnetic properties. More particularly, the present invention relates to a directional electric steel plate in which a surface of a steel plate consisting of Si: 2.0 to 6.5%, acid soluble Al: 0.4 to 5%, Mn: 0.20% or less (0% exclusive), N: 0.010% or less (0% exclusive), S: 0.010% or less (0% exclusive), P: 0.005 to 0.05%, C: 0.04 to 0.12% and a balance of Fe and other unavoidable impurities is hot-dip plated with aluminum or an aluminum-silicon alloy, and heat-treated, so that aluminum on the hot-dip plated layer is diffused or infiltrated into the steel plate, and a method of manufacturing the same.

公开(公告)号：US09799432B2

公开(公告)日：2017-10-24

申请号：US13814629

申请日：2011-08-04

Applicant: Hiroi Yamaguchi ,  Seiji Okabe ,  Takeshi Omura ,  Tadashi Nakanishi

Inventor： Hiroi Yamaguchi ,  Seiji Okabe ,  Takeshi Omura ,  Tadashi Nakanishi

IPC: H01F1/16 ,  H01F1/01 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04 ,  C22C38/34 ,  C22C38/02

CPC classification number: H01F1/01 ,  C21D8/1261 ,  C21D8/1283 ,  C21D8/1288 ,  C21D8/1294 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/34 ,  H01F1/16

Abstract: A grain oriented electrical steel sheet has a magnetic domain structure modified by strain introduction without a trace of treatment, in which noise generated when the grain oriented electrical steel sheet is used laminated on an iron core of a transformer is effectively reduced by: setting a magnetic flux density B8 to 1.92 T or higher; then setting a ratio of average magnetic domain width of treated surface after strain-introducing treatment Wa to average magnetic domain width before strain-introducing treatment W0 as Wa/W0 0.7; and further setting a ratio of average width of magnetic domain discontinuous portion Wd in the untreated surface to average width of magnetic domain discontinuous portion in treated surface resulting from strain-introducing treatment Wc as Wd/Wc>0.8; and setting Wc

公开(公告)号：US20170267455A1

公开(公告)日：2017-09-21

申请号：US15457542

申请日：2017-03-13

Applicant: CAMBRIDGE INTERNATIONAL, INC.

Inventor： Larry Vaughn WINDSOR, JR. ,  William CANNON ,  Alan Scott HENRY ,  Brian Jon ROBINSON ,  Jason Vance TODD ,  Ralph Buck TRAVIS, JR. ,  Robert E. MAINE, JR. ,  Thomas Claude ROSS

IPC: B65G17/08 ,  B21B1/16

CPC classification number: B65G17/083 ,  C21D7/00 ,  C21D9/50 ,  C21D2201/05 ,  F16G1/18

Abstract: A conveyor belt configured for a direction of travel, the conveyor belt including a plurality of connecting rods; and a spiral overlay; wherein each of the connecting rods has a flattened oblong cross section. In addition, a method a manufacturing a connector rod for a conveyor, belt includes providing a connector rod having a circular cross section; rolling the connector rod along a longitudinal axis thereof, and thereby producing a flattened oblong cross section.

公开(公告)号：US20170130294A1

公开(公告)日：2017-05-11

申请号：US15411372

申请日：2017-01-20

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Tatsuo YOKOI ,  Hiroshi SHUTO ,  Riki OKAMOTO ,  Nobuhiro FUJITA ,  Kazuaki NAKANO ,  Takeshi YAMAMOTO

IPC: C21D9/46 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C21D6/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C22C38/28 ,  C22C38/08

CPC classification number: C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2201/05 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/28 ,  C22C38/38 ,  C22C38/58

Abstract: The present invention provides a bainite-containing-type high-strength hot-rolled steel sheet. The steel sheet, containing C: greater than 0.07 to 0.2%, Si: 0.001 to 2.5%, Mn: 0.01 to 4%, P: 0.15% or less, S: 0.03% or less, N: 0.01% or less, Al: 0.001 to 2% and a balance being composed of Fe and impurities, has an average value of pole densities of the {100} to {223} orientation group at a sheet thickness center portion being a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet is 4.0 or less, and a pole density of the {332} crystal orientation is 4.8 or less, an average crystal grain diameter is 10 μm or less and vTrs is −20° C. or lower, and a microstructure is composed of 35% or less in a structural fraction of pro-eutectoid ferrite and a balance of a low-temperature transformation generating phase.

公开(公告)号：US09637805B2

公开(公告)日：2017-05-02

申请号：US14118720

申请日：2012-12-18

Applicant: ThyssenKrupp Steel Europe AG

Inventor： Dorothee Dorner ,  Olaf Fischer ,  Karl Telger

IPC: C21D8/02 ,  C21D8/12 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  H01F1/16 ,  H01F1/147

CPC classification number: C21D8/0273 ,  C21D8/12 ,  C21D8/1272 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  H01F1/14775 ,  H01F1/16

Abstract: A non-grain-oriented electrical steel strip or sheet consisting of a steel which contains, in addition to iron and unavoidable impurities, (in wt. %) Si: 1.0-4.5%, Al: up to 2.0%, Mn: up to 1.0%, C: up to 0.01%, N: up to 0.01%, S: up to 0.012%, Ti: 0.1-0.5% P: 0.1-0.3%, wherein 1.0≦% Ti/% P≦2.0 applies for the % Ti/% P ratio. The NGO sheet or strip can be manufactured by cold rolling a hot strip of a steel having the previously mentioned composition into a cold strip and subjecting this cold strip to a final annealing process. Different variants of this final annealing process may be used to accentuate the properties of the strip or sheet. The non-grain-oriented electrical steel strip or sheet and components manufactured from such a sheet or strip for electrotechnical applications are characterized by increased strength and good magnetic properties.