Working Patents (Class 148/111)
  • Patent number: 10541071
    Abstract: An electrical steel sheet includes: a specific chemical composition; a crystal grain diameter of 20 ?m to 300 ?m; and a texture satisfying Expression 1, Expression 2, and Expression 3 when the accumulation degree of the (001)[100] orientation is represented as ICube and the accumulation degree of the (011)[100] orientation is represented as IGoss. IGoss+ICube?10.5??Expression 1 IGoss/ICube?0.50??Expression 2 ICube?2.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: January 21, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hirotoshi Tada, Satoshi Kano, Ichiro Tanaka, Hiroyoshi Yashiki
  • Patent number: 10434606
    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.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: October 8, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hideyuki Hamamura, Tatsuhiko Sakai, Fumiaki Takahashi, Hisashi Mogi, Shunsuke Okumura, Hirofumi Imai
  • Patent number: 10385414
    Abstract: An unoriented silicon steel having high magnetic conductivity and low iron loss at a working magnetic density of 1.0-1.5 T and method for manufacturing same. By proper deoxidation control in a RH refining and high-temperature treatment for a short time in a normalizing step, the method can reduce the amount of inclusions in the silicon steel and improve grain shape, so as to improve the magnetic conductivity and iron loss of the unoriented silicon steel at a magnetic density of 1.0-1.5 T.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: August 20, 2019
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Liang Zou, Bo Wang, Xiandong Liu, Aihua Ma, Shishu Xie, Hongxu Hei
  • Patent number: 10347405
    Abstract: An alloy of Fe100-a-b-c-d-x-y-zCuaNbbMcTdSixByZz and up to 1 atomic % impurities; M is one or more of Mo or Ta, T is one or more of V, Cr, Co or Ni and Z is one or more of C, P or Ge, wherein 0.0 atomic %?a<1.5 atomic %, 0.0 atomic %?b<3.0 atomic %, 0.2 atomic %?c?4.0 atomic %, 0.0 atomic %?d<5.0 atomic %, 12.0 atomic %<x<18.0 atomic %, 5.0 atomic %<y<12.0 atomic % and 0.0 atomic %?z<2.0 atomic %, and wherein 2.0 atomic %?(b+c)?4.0 atomic %, produced in the form of a strip and having a nanocrystalline structure in which at least 50% by volume of the grains have an average size of less than 100 nm, a remanence ratio Jr/Js<0.02, Jr being the remanent polarization and Js being the saturation polarization, and a coercitive field strength Hc which is less than 1% of the anisotropic field strength Ha and/or less than 10 A/m.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: July 9, 2019
    Assignee: VACUUMSCHMELZE GMBH & CO. KG.
    Inventors: Giselher Herzer, Mie Marsilius, Christian Polak
  • Patent number: 10297375
    Abstract: A method of manufacturing a grain-oriented electrical steel sheet, includes: a laser processing process of forming a laser processed portion by irradiating a region on one end side of a steel sheet in a width direction after being subjected to a cold rolling process with a laser beam along a rolling direction of the steel sheet; and a finish annealing process of coiling the steel sheet with the laser processed portion formed thereon in a coil shape and performing a finish annealing on the coil-shaped steel sheet. In the laser processing process, a melted-resolidified portion having a depth of greater than 0% and equal to or less than 80% of a sheet thickness of the steel sheet is formed by the irradiation of the laser beam at a position corresponding to the laser processed portion.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: May 21, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Koji Hirano, Yoshio Nakamura, Shohji Nagano, Seiichiro Cho
  • Patent number: 10240220
    Abstract: Embodiments of the present invention comprises melting scrap steel into molten steel; decarburizing the molten steel and adding alloys; transferring the steel to ladles and casting the steel into slabs; hot rolling the slabs into sheets; pickling the sheets; annealing the sheets; cold rolling the sheets; and performing one or more of tension leveling, a rough rolling, or a coating process on the sheets after cold rolling, without an intermediate annealing process between the cold rolling and the tension leveling, the rough rolling, or the coating process. The sheet is sent to the customer for stamping and customer annealing. The new process provides an electrical steel with the similar, same, or better magnetic properties than an electrical steel manufactured using the traditional processing with an intermediate annealing step after cold rolling.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: March 26, 2019
    Assignee: NUCOR CORPORATION
    Inventors: Theodore E. Hill, Eric E. Gallo
  • Patent number: 10214791
    Abstract: A non-oriented electrical steel sheet containing: in mass%, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/?m3 or less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750° C. to an Ac1 transformation point and a method of setting a coil winding temperature to 780° C. or higher and performing self annealing.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: February 26, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Masahiro Fujikura, Yoshiyuki Ushigami, Tesshu Murakawa, Shinichi Kanao, Makoto Atake, Takeru Ichie, Kojiro Hori
  • Patent number: 10208372
    Abstract: A grain-oriented electrical steel sheet being a grain-oriented electrical steel sheet containing Si of 0.8 mass % to 7 mass %, Mn of 0.05 mass % to 1 mass %, B of 0.0005 mass % to 0.0080 mass %, each content of Al, C, N, S, and Se of 0.005 mass % or less, and a balance being composed of Fe and inevitable impurities and having a glass coating film made of composite oxide mainly composed of forsterite on the steel sheet surface, in which when glow discharge optical emission spectrometry (GDS) to the surface of a secondary coating film formed on the surface of the glass coating film under a predetermined condition is performed, a peak, of B, in emission intensity having a peak position in emission intensity different from a peak position, of Mg, in emission intensity is obtained and the peak position, of B, in emission intensity from the steel sheet surface is deeper than the peak position, of Mg, in emission intensity.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: February 19, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Fumiaki Takahashi, Yoshiyuki Ushigami, Kazumi Mizukami, Shuichi Nakamura, Norikazu Fujii, Norihiro Yamamoto, Masahide Urago
  • Patent number: 10192669
    Abstract: A vector-magnetic-property-controlling material according to the present embodiment is subjected to a scratching process in two directions that intersect on the surface of a steel material. An iron core according to the present embodiment is configured from an oriented magnetic steel material which has been subjected to a scratching process in two directions that intersect on the surface thereof.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: January 29, 2019
    Assignees: TOSHIBA INDUSTRIAL PRODUCTS & SYSTEMS CORPORATION, NATIONAL UNIVERSITY CORPORATION OITA UNIVERSITY
    Inventors: Masato Enokizono, Hiromu Shiota, Eiji Shimomura, Tsuyoshi Masuda
  • Patent number: 10192662
    Abstract: In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002-0.10 mass %, Si: 2.0-8.0 mass %, and Mn: 0.005-1.0 mass %, subjecting the steel sheet to a hot band annealing as required, cold rolling to obtain a cold rolled sheet having a final sheet thickness, subjecting the steel sheet to primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to final annealing, rapid heating is performed at a rate of not less than 50° C./s in a region of 200-700° C. in the heating process of the primary recrystallization annealing, and the steel sheet is held at any temperature of 250-600° C. in the above region for 1-10 seconds, while a soaking process of the primary recrystallization annealing is controlled to a temperature range of 750-900° C., a time of 90-180 seconds and PH2O/PH2 in an atmosphere of 0.25-0.
    Type: Grant
    Filed: February 12, 2014
    Date of Patent: January 29, 2019
    Assignee: JFE Steel Corporation
    Inventors: Makoto Watanabe, Takeshi Imamura, Ryuichi Suehiro, Toshito Takamiya
  • Patent number: 10176910
    Abstract: The present invention provides a non-oriented silicon steel with excellent magnetic properties and a manufacturing process therefor. During the manufacturing process of the present invention, the temperature T of the molten steel of steel tapped from a converter during steelmaking and the carbon content [C] and the free oxygen content [O] comply with the following formula: 7.27×103?[O][C]e(?5000/T)?2.99×104, and the final annealing step uses tension annealing at a low temperature for a short time. A non-oriented silicon steel with a low iron loss, and excellent anisotropy of iron loss can be obtained by means of the manufacturing process of the present invention.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: January 8, 2019
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Shishu Xie, Xiandong Liu, Xiao Chen, Hongxu Hei, Bo Wang, Aihua Ma, Liang Zou, Huawei Zhang, Wei Cao, Feng Zhang, Junliang Liu
  • Patent number: 10134513
    Abstract: Provided is a method for manufacturing a high silicon steel sheet having excellent producibility and magnetic properties. The method includes: casting a molten metal as a strip having a thickness of 5 mm or less, the molten metal comprising, by weight %, C: 0.05% or less (excluding 0%), N: 0.05% or less (excluding 0%), Si: 4% to 7%, Al: 0.5% to 3%, Si+Al: 4.5% to 8%, and the balance of Fe and inevitable impurities; hot-rolling the cast strip at a temperature of 800° C. or higher; annealing the hot-rolled strip at a temperature within a range of 900° C. to 1200° C.; cooling the annealed strip; warm-rolling the quenched strip at a temperature within a range of 300° C. to 700° C.; and finally annealing the warm-rolled strip at a temperature within a range of 800° C. to 1200° C.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: November 20, 2018
    Assignee: POSCO
    Inventors: Byung-Deug Hong, Jin-Mo Koo, Jae-Kon Lee, Sung-Jin Park, Sang-Hoon Kim
  • Patent number: 10125416
    Abstract: The present invention provides a steel for nitrocarburizing having excellent mechanical workability before nitrocarburizing, and showing excellent fatigue properties after nitrocarburizing, which is suitable for applying in mechanical structural components for automobiles etc. prepared by adjusting the composition so that it contains in mass %, C: 0.01% or more and less than 0.10%, Si: 1.0% or less, Mn: 0.5% to 3.0%, P: 0.02% or less, S: 0.06% or less, Cr: 0.3% to 3.0%, Mo: 0.005% to 0.4%, V: 0.02% to 0.5%, Nb: 0.003% to 0.15%, Al: 0.005% to 0.2%, and Sb: 0.0005% to 0.02%, and the balance including Fe and incidental impurities, and setting the area ratio of bainite phase to the whole microstructure to more than 50%.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: November 13, 2018
    Assignees: JFE STEEL CORPORATION, JFE BARS AND SHAPES
    Inventors: Yasuhiro Omori, Kiyoshi Uwai, Shinji Mitao, Takashi Iwamoto, Keisuke Ando, Kunikazu Tomita
  • Patent number: 10096414
    Abstract: Disclosed are a non-oriented electrical steel sheet and a method of manufacturing the same. The non-oriented electrical steel sheet of the present invention includes 0.005 wt % or less of C, 1.0-4.0 wt % of Si, 0.1-0.8 wt % of Al, 0.01-0.1 wt % of Mn, 0.02-0.3 wt % of P, 0.005 wt % or less of N, 0.001-0.005 wt % of S, 0.005 wt % or less of Ti, 0.01-0.2 wt % of at least one of Sn and Sb, and the remainder including Fe and other impurities unavoidably added thereto, wherein Mn, Al, P, and S may respectively fulfill the empirical formula 0.8?{[Mn]/(100*[S])+[Al]}[P]?40, wherein [Mn], [Al], [P], and [S] respectively refer to weight percentages of Mn, Al, P, and S.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: October 9, 2018
    Assignee: POSCO
    Inventors: Junesoo Park, Byung-Keun Bae, Yong-Soo Kim, Su-Yong Sin
  • Patent number: 10020103
    Abstract: A grain oriented electrical steel sheet reduces local exfoliation of insulating coating films and thus has excellent corrosion resistance and insulation properties. The grain oriented electrical steel sheet may be obtained by, assuming that a1 (?m) is a film thickness of the insulating coating at the floors of linear grooves and a2 (?m) is a film thickness of the insulating coating on a surface of the steel sheet at portions other than the linear grooves, controlling a1 and a2 to satisfy the following formulas (1) and (2): 0.3 ?m?a2?3.5 ?m??(1), and a1/a2?2.5??(2).
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: July 10, 2018
    Assignee: JFE Steel Corporation
    Inventors: Makoto Watanabe, Seiji Okabe, Toshito Takamiya
  • Patent number: 9997283
    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.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: June 12, 2018
    Assignee: POSCO
    Inventors: Kyu-Seok Han, Jae-Soo Lim, Byung-Deug Hong, Chan-Hee Han
  • Patent number: 9978488
    Abstract: A steel slab having a chemical composition including C: not more than 0.005 mass %, Si: not more than 4 mass %, Mn: 0.03-2 mass %, P: not more than 0.2 mass %, S: not more than 0.004 mass %, Al: not more than 2 mass %, N: not more than 0.004 mass %, Se: not more than 0.0010 mass % and the balance being Fe and inevitable impurities is subjected to hot rolling, cold rolling and recrystallization annealing up to 740° C. at an average heating rate of not less than 100° C./s to produce a semi-processed non-oriented electrical steel sheet being high in the magnetic flux density and low in the iron loss after stress relief annealing.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: May 22, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda, Kazuhiro Hanazawa
  • Patent number: 9953752
    Abstract: A method for producing grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a composition consisting of, by mass % or mass ppm, C: 0.08% or less, Si: 2.0% to 4.5% and Mn: 0.5% or less, S, Se, and O: less than 50 ppm each, sol.Al: less than 100 ppm, N: 80 ppm or less, and the balance being Fe and incidental impurities, and satisfying the relation of sol.Al (ppm)?N (ppm)×(26.98/14.00)?30 ppm; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment, under specific condition, before, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and subjecting the cold rolled sheet to secondary recrystallization annealing.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: April 24, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Yukihiro Shingaki, Hiroi Yamaguchi, Yuiko Wakisaka, Hiroshi Matsuda, Takashi Terashima
  • Patent number: 9947446
    Abstract: The pickling loss when a hot-rolled steel sheet having a predetermined chemical composition is annealed at 1000° C. for 30 seconds in a nitrogen atmosphere and then immersed in a solution of 7% HCl at 80° C. for 60 seconds is in a range of 40 g/m2 or more and 100 g/m2 or less. A hot-rolled steel sheet for production of a non-oriented electrical steel sheet with not only excellent magnetic properties such as iron loss and magnetic flux density but also excellent recyclability and steel sheet surface appearance can thus be obtained.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: April 17, 2018
    Assignee: JFE Steel Corporation
    Inventors: Hiroaki Toda, Yoshiaki Zaizen, Tadashi Nakanishi, Yoshihiko Oda
  • Patent number: 9941038
    Abstract: A steel slab having a chemical composition including C: not more than 0.005 mass %, Si: not more than 4 mass %, Mn: 0.03-2 mass %, P: not more than 0.2 mass %, S: not more than 0.004 mass %, Al: not more than 2 mass %, N: not more than 0.004 mass %, Se: not more than 0.0010 mass % and the balance being Fe and inevitable impurities is subjected to hot rolling, cold rolling and recrystallization annealing up to 740° C. at an average heating rate of not less than 100° C./s to produce a semi-processed non-oriented electrical steel sheet being high in the magnetic flux density and low in the iron loss after stress relief annealing.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: April 10, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda, Kazuhiro Hanazawa
  • Patent number: 9939382
    Abstract: The location where forsterite is present is checked in a region from which light excited by an electron beam is emitted when a material containing forsterite is irradiated with an electron beam. The material is preferably a grain oriented electrical steel sheet having a forsterite layer. In addition, it is preferable that the accelerating voltage be 10 kV or more when an electron beam is radiated when the material is a grain oriented electrical steel sheet having a tension coating layer on the forsterite layer.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: April 10, 2018
    Assignee: JFE Steel Corporation
    Inventors: Masayasu Nagoshi, Takako Yamashita, Yukio Usui, Shigehiro Takajo, Kazuhiro Hanazawa
  • Patent number: 9920393
    Abstract: A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss is produced by hot rolling a steel slab comprising C: not more than 0.005 mass %, Si: not more than 4 mass %, Mn: 0.03-3 mass %, Al: not more than 3 mass %, P: 0.03-0.2 mass %, S: present at not more than 0.005 mass %, N: not more than 0.005 mass %, Ca: 0.0005-0.01 mass %, provided that an atom ratio of Ca to S ((Ca mass %/40)/(S mass %/32)) is within a range of 0.5-3.5, and the balance being Fe and incidental impurities, hot band annealing, cold rolling, and then conducting recrystallization annealing by heating at an average temperature rising rate of not less than 100° C/s up to at least 740° C.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: March 20, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda, Tadashi Nakanishi
  • Patent number: 9905343
    Abstract: A method for producing a grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a specific composition; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment with a nitrogen increase of 50 to 1000 ppm, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and setting the staying time in a temperature range of 300 to 800° C. in the secondary recrystallization annealing to 5 to 150 hours.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: February 27, 2018
    Assignee: JFE STEEL CORPORATION
    Inventors: Yukihiro Shingaki, Yasuyuki Hayakawa, Hiroi Yamaguchi, Hiroshi Matsuda, Yuiko Wakisaka
  • Patent number: 9799432
    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<0.4; and setting a ratio of Wa to average magnetic domain width of untreated surface Wb as Wa/Wb>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<0.35 mm.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: October 24, 2017
    Assignee: JFE Steel Corporation
    Inventors: Hiroi Yamaguchi, Seiji Okabe, Takeshi Omura, Tadashi Nakanishi
  • Patent number: 9761359
    Abstract: A method produces a high strength electrical steel sheet in which a cumulative rolling reduction ratio in rough rolling is 73.0% or more, in which in a hot band annealing step, an annealing condition is selected that satisfies an area ratio of recrystallized grains after hot band annealing of 100%, and a recrystallized grain size of 80 ?m to 300 ?m, under a condition where annealing temperature is 850° C. to 1000° C., and annealing duration is 10 seconds to 10 minutes, and in which in a final annealing step, an annealing condition is selected that satisfies an area ratio of recrystallized grains after the final annealing of 30% to 95%, and a length in the rolling direction of a connected non-recrystallized grain group of 2.5 mm or less, under a condition where annealing temperature is 670° C. to 800° C., and annealing duration is 2 seconds to 1 minute.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: September 12, 2017
    Assignee: JFE Steel Corporation
    Inventors: Tadashi Nakanishi, Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda
  • Patent number: 9761360
    Abstract: A method of manufacturing a grain oriented electrical steel sheet uses austenite (?)-ferrite (?) transformation which develops excellent magnetic properties, uses T? calculated from equation (1) and performs the first pass of rough hot rolling at a temperature of (T??100)° C. or higher with a rolling reduction of 30% or more, and further uses T?max calculated from equation (2) and performs any one pass of finish hot rolling in a temperature range of (T?max±50)° C. with a rolling reduction of 40% or more: T?[° C.]=1383.98?73.29[% Si]+2426.33[% C]+271.68[% Ni]??(1) T?max[° C.]=1276.47?59.24[% Si]+919.22[% C]+149.03[% Ni]??(2) where [% A] represents content of element “A” in steel (mass %).
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: September 12, 2017
    Assignee: JFE Steel Corporation
    Inventors: Masanori Takenaka, Toshito Takamiya, Hiroshi Matsuda
  • Patent number: 9748029
    Abstract: In a method of producing a grain-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition comprising C: 0.001 to 0.10 mass %, Si: 1.0 to 5.0 mass %, Mn: 0.01 to 0.5 mass %, S and/or Se: 0.005 to 0.040 mass %, sol. Al: 0.003˜0.050 mass % and N: 0.0010 to 0.020 mass %, subjecting to single cold rolling or two or more cold rollings including an intermediate annealing therebetween to a final thickness, performing primary recrystallization annealing, and thereafter applying an annealing separator to perform final annealing, a temperature range of 550° C. to 700° C. in a heating process of the primary recrystallization annealing is rapidly heated at an average heating rate of 40 to 200° C./s, while any temperature zone of from 250° C. to 550° C. is kept at a heating rate of not more than 10° C./s for 1 to 10 seconds, whereby the refining of secondary recrystallized grains is attained and grain-oriented electrical steel sheets are stably obtained with a low iron loss.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: August 29, 2017
    Assignee: GINZA MARONIE P.C.
    Inventors: Yukihiro Shingaki, Takeshi Imamura, Ryuichi Suehiro, Makoto Watanabe
  • Patent number: 9728332
    Abstract: A wire rod and steel wire having superior magnetic characteristics and a method for manufacturing same, wherein the wire rod and the steel wire can be used in transformers, vehicles, electric or electronic products, or the like which require low iron loss and high permeability. Provided are a wire rod and steel wire having superior magnetic characteristics and a method for manufacturing same, wherein the wire rod or the steel wire comprises, by wt %, 0.03 to 0.05% of C, 3.0 to 5.0% of Si, 0.1 to 2.0% of Mn, 0.02 to 0.08% of Al, 0.0015 to 0.0030% of N, and the remainder being Fe and unavoidable impurities. The wire rod and steel wire having directional properties may be provided by a general manufacturing process without using expensive alloying elements and without having to add a manufacturing facility.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: August 8, 2017
    Assignee: POSCO
    Inventors: Dong-Hyun Kim, You-Hwan Lee, Woo-Gi Shin
  • Patent number: 9719160
    Abstract: An austenitic antibacterial stainless steel formulation provides a high strength, highly corrosion resistant, antimicrobial product at a relatively low cost wherein antimicrobial performance is dramatic and greater mechanical properties and corrosion resistance are achieved as well. The alloy may comprise key constituents of Fe, Cr, Ni, and C plus a mischmetal having Ce and La components.
    Type: Grant
    Filed: March 20, 2016
    Date of Patent: August 1, 2017
    Inventors: Francis Joseph Gojny, Donald Jeen Chang Sun
  • Patent number: 9708682
    Abstract: Grain-oriented electrical steel sheets with good magnetic properties are industrially stably produced, by using as the material, a steel slab having a predetermined composition, wherein after cold rolling and before the start of secondary recrystallization annealing, the cold rolled sheet is subjected to nitriding treatment with nitrogen content of 50 mass ppm or more and 1000 mass ppm or less, and a total content of 0.2 mass % to 15 mass % of a sulfide and/or sulfate is contained in an annealing separator, and a staying time in the temperature range of 300° C. to 800° C. in the heating stage of secondary recrystallization annealing of 5 hours or more is secured to precipitate silicon nitride (Si3N4) and MnS, and using the silicon nitride in combination with MnS as inhibiting force for normal grain growth to significantly reduce variation of magnetic properties.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: July 18, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Yasuyuki Hayakawa, Yukihiro Shingaki, Hiroi Yamaguchi, Hiroshi Matsuda, Yuiko Wakisaka
  • Patent number: 9663839
    Abstract: Provided is a method for manufacturing a grain-oriented electrical steel sheet, the method comprising: heating a grain-oriented electrical steel sheet slab; hot-rolling the heated slab; optionally annealing the hot-rolled steel sheet; subjecting the resulting steel sheet to one cold rolling or two or more cold rollings with intermediate annealing therebetween; subjecting the cold-rolled steel sheet to primary recrystallization annealing; and subjecting the annealed steel sheet to secondary recrystallization annealing, wherein the primary recrystallization annealing sequentially comprises an ultra-rapid heating process of heating the steel sheet at an average heating rate of 300° C./sec or higher, a rapid heating process of heating the steel sheet at a lower average heating rate than the average heating rate of the ultra-rapid heating process, but not lower than 100° C.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: May 30, 2017
    Assignee: POSCO
    Inventors: Hyung-Don Joo, Chang-Soo Kim, Jong-Tae Park, Jong-Ho Park, Byeong-Goo Kim, Jin-Wook Seo
  • Patent number: 9623656
    Abstract: A vibration layer is formed by the AD method on a cavity plate before forming pressure chambers, a common electrode is formed on the vibration layer, and a piezoelectric layer is formed on the common electrode by the AD method. Subsequently, the pressure chambers are formed in the cavity plate by the etching. After that, individual electrodes are formed on the piezoelectric layer. Subsequently, the stack of the cavity plate, the vibration layer, the common electrode, the piezoelectric layer, and the individual electrodes is heated at about 850° C. to simultaneously perform the annealing of the piezoelectric layer and the sintering of the individual electrodes and the common electrode. Accordingly, the atoms of the cavity plate are suppressed from being diffused into the driving portions of the piezoelectric layer.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: April 18, 2017
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Hiroto Sugahara
  • Patent number: 9617616
    Abstract: In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material containing C: 0.002-0.10 mass %, Si: 2.0-8.0 mass % and Mn: 0.005-1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled steel sheet after or without hot band annealing to one stage cold rolling or two or more stage cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to decarburization annealing combined with primary recrystallization annealing, applying an annealing separator to the steel sheet surface and then subjecting to a final annealing, when rapid heating is performed at a rate of not less than 50° C./s in a range of 200-700° C. of the decarburization annealing, the cold rolled sheet is subjected to holding at any temperature of 250-600° C.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: April 11, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Takeshi Imamura, Yukihiro Shingaki, Makoto Watanabe, Ryuichi Suehiro, Toshito Takamiya
  • Patent number: 9607744
    Abstract: A laser processing apparatus includes a laser irradiation unit has a structure providing an intensity distribution of the laser beam focused on the grain-oriented electrical steel sheet on a cross-section in a direction perpendicular to the scanning direction on the grain-oriented electrical steel sheet so as to satisfy Ib/Ia?2, where Ra1 and Ra2 are distances between the centroid of the intensity distribution and positions at which the intensity integration value from the centroid of the intensity distribution is 43% of the total intensity integration value, beam intensities Ia1 and Ia2 are intensities of the laser beam corresponding to Ra1 and Ra2, respectively, Ia is the average value of Ia1 and Ia2 and Ib is the beam intensity at the centroid of the intensity distribution.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: March 28, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Koji Hirano, Hirofumi Imai, Hideyuki Hamamura
  • Patent number: 9604312
    Abstract: A fast-speed laser scoring method is provided, in which a set of related laser scoring device is used to simultaneously score lines on the upper surface and the lower surface of an oriented silicon steel strip, which is being fed and traveling forwards on a production line, with high-focalized continuous wave laser beam; the lines scored on the upper surface and the lines scored on the lower surface have the same space between every two adjacent scored lines but are staggered each other in order to reduce iron loss evenly. The space between every two adjacent scored lines on the same surface is 6-12 mm, laser power is 1000-3000 W and scanning speed is 100-400 m/min. The machining rate of the scoring method and device attains 1.5-2 times the one of conventional scoring methods which can not simultaneously score the upper and lower surfaces of a steel strip at a time. The lines scored on a steel strip by the method can reduce iron loss of the strip by 10-16%.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: March 28, 2017
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Wangya Huang, Guobao Li, Xinqiang Zhang, Xing Mao, Wanqing Guo, Jianru Zhu, Banglin Xiang
  • Patent number: 9574249
    Abstract: A method includes preparing a steel slab in which contents of inhibitor components have been reduced, i.e. content of Al: 100 ppm or less, and contents of N, S and Se: 50 ppm, respectively; subjecting the steel slab to hot rolling and then either a single cold rolling process or two or more cold rolling processes interposing intermediate annealing(s) therebetween to obtain a steel sheet having the final sheet thickness; and subjecting the steel sheet to primary recrystallization annealing and then secondary recrystallization annealing. The primary recrystallization annealing includes heating the steel sheet to temperature equal to or higher than 700° C. at a heating rate of at least 150° C./s, cooling the steel sheet to a temperature range of 700° C. or lower, and then heating the steel sheet to soaking temperature at the average heating rate not exceeding 40° C./s in a subsequent heating zone.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: February 21, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Takeshi Omura, Yasuyuki Hayakawa
  • Patent number: 9536657
    Abstract: A grain oriented electrical steel sheet is subjected to magnetic domain refinement by laser irradiation and has magnetic flux density B8 of at least 1.91T, wherein the nitrogen content in the forsterite coating is 3.0 mass % or less. The grain oriented electrical steel sheet satisfies recent demand for iron loss reduction.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: January 3, 2017
    Assignee: JFE Steel Corporation
    Inventors: Takeshi Omura, Hiroaki Toda, Hiroi Yamaguchi, Seiji Okabe
  • Patent number: 9536658
    Abstract: A grain oriented electrical steel sheet that is subjected to magnetic domain refining treatment by electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer in which tension exerted on the steel sheet by the forsterite film is 2.0 MPa or higher both in a rolling direction and a direction transverse (perpendicular) to the rolling direction, and a ratio of an irradiation pitch in a thermal strain introduced region (B) to a spot diameter (A) on an electron beam irradiation surface satisfies 0.5?B/A?5.0.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: January 3, 2017
    Assignee: JFE Steel Corporation
    Inventors: Takeshi Omura, Hiroi Yamaguchi, Seiji Okabe
  • Patent number: 9514868
    Abstract: A grain oriented electrical steel sheet is subjected to magnetic domain refinement by laser irradiation or electron irradiation and exhibits excellent low noise properties and low iron-loss properties when assembled into a real transformer device, by setting: the total tension (A) in rolling direction imparted to the steel sheet by the forsterite coating and the tension coating to be equal to or higher than 10.0 MPa; setting the total tension (B) in a direction orthogonal to the rolling direction imparted to the steel sheet by the forsterite coating and the tension coating to be equal to or higher than 5.0 MPa; and setting the total tension (A) and the total tension (B) to satisfy a formula shown below. 1.0?A/B?5.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: December 6, 2016
    Assignee: JFE Steel Corporation
    Inventors: Takeshi Omura, Hiroi Yamaguchi, Seiji Okabe
  • Patent number: 9496078
    Abstract: A hot rolled silicon steel producing method comprises: silicon steel slab heating process, rough rolling process and finish rolling process. The heating process comprises a pre-heating stage, a heating stage and a soaking stage. The pre-heating stage satisfies the following formula (1). In the formula, VTp is a temperature increasing rate, in the pre-heating stage, whose unit is ° C./min; t is a total heating time of the slab in the heating furnace, and t=180-240 min; and Tc is an initial temperature when the slab is put into the furnace, whose unit is ° C. By using the foregoing formula, the heating process and the rough rolling process are changed, an occurrence rate of edge defects during the production of the hot rolled silicon steel can be reduced, and the hot rolled silicon steel with good surface quality can be produced. V Tp > 220 ? ? min t × 100 ? ° ? ? C . T C + 200 ? ° ? ? C . × 25 ? ° ? ? C .
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: November 15, 2016
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Huawei Zhang, Yaping Wu, Yu Gong, Yezhong Sun, Hongxu Hei
  • Patent number: 9421592
    Abstract: An asymmetric rolling method for rolling a rolling material by using at least one pair of working rolls comprises rolls rotating at the same linear velocity and having different diameters. An asymmetric rolling apparatus may comprise a first roll contacting a first surface of a rolling material, a second roll having a diameter different from that of the first roll and contacting a second surface of the rolling material opposite to the first surface, and a power providing unit for providing power to each of the first and second rolls to adjust a ratio between angular velocities of the first and second rolls.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: August 23, 2016
    Assignee: GANGNEUNG-WONJU NATIONAL UNIVERSITY INDUSTRY ACADEMY COOPERATION GROUP
    Inventors: Hyo-Tae Jeong, Byung-Hak Choe
  • Patent number: 9406437
    Abstract: A grain oriented electrical steel sheet has thickness of forsterite film at bottom portions of grooves formed on a surface of the steel sheet is ?0.3 ?m, groove frequency is ?20%, abundance ratio of grooves crystal grains directly beneath themselves, each crystal grain having orientation deviating from Goss orientation by ?10° and grain size ?5 ?m, total tension exerted on the steel sheet in the rolling direction by the forsterite film and tension coating is ?10.0 MPa, total tension exerted on the steel sheet in a direction perpendicular to the rolling direction by the forsterite film and tension coating is ?5.0 MPa and total tension satisfies 1.0?A/B?5.0, where A is total tension exerted in rolling direction by forsterite film and tension coating, and B is total tension exerted in direction perpendicular to rolling direction by forsterite film and tension coating.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: August 2, 2016
    Assignee: JFE Steel Corporation
    Inventors: Takeshi Omura, Hirotaka Inoue, Hiroi Yamaguchi, Seiji Okabe
  • Patent number: 9399266
    Abstract: A machine for the surface treatment of a cylinder includes a first operative station for supporting the cylinder and for bringing it into rotation around its longitudinal axis, and at least a second operative station cooperating with the first station for generating and emitting, by means of an optical fiber apparatus, pulsed laser radiations randomly striking the surface of the cylinder and defining a desired roughness on the same surface; the second station being adjustably coupled with the first station in a first direction parallel with respect to the axis of the cylinder and carrying one or more pulsed laser radiation emitting heads, and slidingly assembled with respect to the cylinder in a second direction perpendicular to the axis of the cylinder.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: July 26, 2016
    Assignee: TENOVA S.P.A.
    Inventors: Claudio Trevisan, Paolo Gaboardi, Giovanni Boselli
  • Patent number: 9396872
    Abstract: A grain oriented electrical steel sheet may reduce iron loss of material with linear grooves formed thereon for magnetic domain refinement and offer excellent low iron loss properties when assembled as an actual transformer, where the steel sheet has sheet thickness of 0.30 mm or less, linear grooves are formed at intervals of 2-10 mm in the rolling direction, the depth of each of the linear grooves is 10 ?m or more, the thickness of the forsterite film at bottom portions of the linear grooves is 0.3 ?m or more, total tension applied to the steel sheet by the forsterite film and tension coating is 10.0 MPa or higher in rolling direction, and the proportion of eddy current loss in iron loss W17/50 of the steel sheet is 65% or less when alternating magnetic field of 1.7 T and 50 Hz is applied to the steel sheet in the rolling direction.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: July 19, 2016
    Assignee: JFE Steel Corporation
    Inventors: Hirotaka Inoue, Takeshi Omura, Hiroi Yamaguchi, Seiji Okabe
  • Patent number: 9348049
    Abstract: Methods and systems for estimating the residual static terms for multi-component land datasets are described. A one-pass estimation simultaneously using P-P pre-stack data and P-S pre-stack data for generating common source residual statics for the P-P data and the P-S data and separate receiver residual statics for the P-P data and the P-S data. A series of iterations are performed using either a linear or a non-linear simulation to converge on acceptable residual statics.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: May 24, 2016
    Assignee: CGG SERVICES SA
    Inventors: David Le Meur, Guillaume Poulain
  • Patent number: 9328396
    Abstract: The present invention has as objective a procedure for the oriented-grain magnetic sheet that provides particular operative hot rolling mill conditions of silicon steel slabs, by means which it is possible to highly contain the heterogeneities of hot rolled sheet re-crystallization. The use of these operative conditions permits to reduce the growing tendency of the crystallized grain during the annealing of the sheets at a final thickness that precedes the secondary oriented re-crystallization. Contemporarily, the particular operational conditions of hot rolling mill according to the invention permit a fine precipitation of secondary phases useful to the control of the grain growing, starting from a quantity of sulphur (S) and nitrogen (N) in matrix lower than corresponding provided by the conventional technologies and consequently disposable in metallic solid solution before the rolling after the heating of the slabs at temperature values lower than 1300° C.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: May 3, 2016
    Assignee: CENTRO SVILUPPO MATERIALI S.P.A.
    Inventors: Giuseppe Abbruzzese, Stefano Cicale, Stefano Fortunati
  • Patent number: 9290824
    Abstract: In a method of producing a grain-oriented electrical steel sheet by hot-rolling a steel slab of a chemical composition containing C: 0.001˜0.10%, Si: 1.0˜5.0%, Mn: 0.01˜1.0%, at least one of S and Se: 0.01˜0.05% in total, sol. Al: 0.003˜0.050%, N: 0.001˜0.020% by mass, subjecting to cold rolling, a primary recrystallization annealing, application of an annealing separator mainly composed of MgO and a finish annealing, a temperature rising rate S1 between 500˜600° C. in the primary recrystallization annealing is made to not less than 100° C./s and a temperature rising rate S2 between 600˜700° C. is made to 30° C./s˜0.6×S1° C./s, while a total content W (mol %) of an element having an ionic radius of 0.6˜1.3 ? and an attracting force between the ion and oxygen of not more than 0.7 ??2 included in the annealing separator to MgO is adjusted to satisfy 0.01S2?5.5?Ln (W)?0.01S2?4.3 to produce a grain-oriented electrical steel sheet having excellent iron loss properties and coating properties.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: March 22, 2016
    Assignee: JFE Steel Corporation
    Inventors: Makoto Watanabe, Yukihiro Shingaki, Toshito Takamiya, Tomoyuki Okubo, Kunihiro Senda
  • Patent number: 9267193
    Abstract: A high-strength steel sheet comprises, by weight, not less than 0.25% and not more than 0.5% of C, not less than 4% and not more than 14% of Mn, not less than 6.5% and not more than 9.5% of Cr, and not less than 0.3% and not more than 3% of Si. The high-strength steel sheet satisfies formulas 1 and 2, formula (1) being 12?2.0Si+5.5Al+Cr+1.5Mo?25 and formula (2) being 13?30C+0.5Mn+0.3Cu+Ni+25N?17, and mainly consists of austenite, and the high-strength steel sheet has yield strength of not less than 1000 MPa and total elongation of not less than 20%. In formulas 1 and 2, each element in the above formulas indicates the content, in weight %, of the element.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: February 23, 2016
    Assignee: HONDA MOTOR CO., LTD
    Inventors: Masashi Ishii, Sven Leonhardt, Yoshitaka Okitsu, Klaus Brokmeier, Georg Frommeyer, Ursula Frommeyer, Astrid Frommeyer
  • Patent number: 9175362
    Abstract: Hot rolling is performed on a steel with a predetermined composition containing Ti: 0.0020 mass % to 0.010 mass % and/or Cu: 0.010 mass % to 0.50 mass % to obtain a hot-rolled steel sheet. Annealing is performed on the hot-rolled steel sheet to obtain an annealed steel sheet. Cold rolling is performed on the annealed steel sheet to obtain a cold-rolled steel sheet. Decarburization annealing and nitridation annealing are performed on the cold-rolled steel sheet to obtain a decarburized nitrided steel sheet. Then, finish annealing is performed on the decarburized nitrided steel sheet. When obtaining the decarburized nitrided steel sheet, heating on the cold-rolled steel sheet is started in a decarburizing and nitriding atmosphere, then first annealing is performed at a first temperature within a predetermined range, and then second annealing is performed at a second temperature within a predetermined range.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: November 3, 2015
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kenichi Murakami, Yoshiyuki Ushigami
  • Patent number: 9139886
    Abstract: In a method for producing a grain-oriented electrical steel sheet, grooves each having a given length and extending in a direction including a direction perpendicular to a transportation direction of the grain-oriented electrical steel sheet are formed at given intervals in the transportation direction by irradiating the surface of the grain-oriented electrical steel sheet with a laser beam while scanning the surface of the grain-oriented electrical steel sheet with the laser beam. Further, in the method for manufacturing a grain-oriented electrical steel sheet, the laser beam is a continuous-wave laser beam having a laser wavelength ? of 1.0 ?m to 2.1 ?m, power density Pd [W/mm2] which is obtained by dividing laser beam intensity P by a focused beam area S is 5×105 W/mm2 or more, and the power density Pd [W/mm2] and scanning speed V [mm/s] of a focused spot of the laser beam on the surface of the grain-oriented electrical steel sheet satisfy a relationship of 0.005×Pd+3000?V?0.005×Pd+40000.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: September 22, 2015
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Tatsuhiko Sakai, Hideyuki Hamamura