Silicon Containing Patents (Class 148/307)
  • Patent number: 11333265
    Abstract: An electromagnetic valve used in a fuel system, in which at least a portion of a member constituting an magnetic circuit in an electromagnetic drive unit includes 0.15-0.45 mass % (inclusive) Ni, 0.65-1.0 mass % (inclusive) Al, 9.2-10.3 mass % (inclusive) Cr, and 0.90-1.6 mass % (inclusive) Mo, and the remainder comprises an alloy material comprising Fe and unavoidable impurities. The alloy material may further include 0.05-0.15 mass % (inclusive) Pb.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: May 17, 2022
    Assignees: DAIDO STEEL CO., LTD., DENSO CORPORATION
    Inventors: Akihiko Saito, Takeshi Takano, Yu Nakama, Satoshi Doi, Takeshi Senoo, Tetsuya Aoki, Masatsune Ozawa, Makoto Saizen
  • Patent number: 11326219
    Abstract: Provided are: a grain-oriented electromagnetic steel sheet exhibiting excellent coating film adhesion and excellent magnetic characteristics; and a method for producing this grain-oriented electromagnetic steel sheet. This grain-oriented electromagnetic steel sheet is provided with a ceramic coating film arranged on a steel sheet, and an oxide insulating tension coating film arranged on the ceramic coating film. The ceramic coating film contains a nitride and an oxide; the nitride contains at least one element selected from the group consisting of Cr, Ti, Zr, Mo, Nb, Si, Al, Ta, Hf, W and Y; and the oxide has a corundum crystal structure. The Young's modulus of the ceramic coating film as determined by a nanoindentation method is 230 GPa or more; the average film thickness of the ceramic coating film is from 0.01 ?m to 0.30 ?m (inclusive); and the tension of the oxide insulating tension coating film is 10 MPa or more.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: May 10, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Shigehiro Takajo, Takumi Umada, Takashi Terashima
  • Patent number: 11286537
    Abstract: According to the disclosure, it is possible to increase the magnetic flux density and reduce iron loss by setting a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and at least one of Sb: 0.0010% or more and 0.10% or less, and Sn: 0.0010% or more and 0.10% or less, with the balance being Fe and inevitable impurities, an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 ?m or more and 200 ?m or less, and a Vickers hardness of 140 HV or more and 230 HV or less.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: March 29, 2022
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoshihiko Oda, Tomoyuki Okubo, Yoshiaki Zaizen, Masanori Uesaka
  • Patent number: 11180819
    Abstract: Provided is an oriented electrical steel sheet including a groove existing on the surface of the electrical steel sheet and a forsterite layer formed on a part or all of the surface of the electrical steel sheet, in which forsterite which is extended from the forsterite layer and penetrates to a base steel sheet in an anchor form is present on the surface of the side of the groove.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: November 23, 2021
    Assignee: POSCO
    Inventors: Oh-Yeoul Kwon, Seung Gon Lee, Hyun-Chul Park, Jung Hun Park, Seong-Kyu See, Sung-Yeun Won, Jae-Kyoum Kim, Jong-Tae Park, Se Min Park
  • Patent number: 11174526
    Abstract: A grain-oriented electrical steel sheet that includes a base coating with a high TiN ratio advantageous for the application of tension to the steel sheet and has excellent magnetic property is provided. The grain-oriented electrical steel sheet includes: a base coating having a peak value PTiN of TiN in the form of osbornite, observed in a range of 42°<2?<43° and a peak value PSiO2 of SiO2 in the form of cristobalite, observed in a range of 23°<2?<25° of both more than 0 and satisfying a relationship PTiN?PSiO2, in thin-film X-ray diffraction analysis; and an iron loss W17/50 of 1.0 W/kg or less.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: November 16, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Yukihiro Shingaki, Tomoyuki Okubo, Hirotaka Inoue
  • Patent number: 11091842
    Abstract: 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 ?m. The thickness of the insulating tensile coating is at least 1.0 ?m. 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 %.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: August 17, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Takumi Umada, Shigehiro Takajo, Takashi Terashima, Minoru Takashima, Yasuyuki Hayakawa
  • Patent number: 11081266
    Abstract: Soft magnetic alloy powder includes plurality of soft magnetic alloy particles of soft magnetic alloy represented by composition formula (Fe(1?(?+?))X1?X2?)(1?(a+b+c++e+f+g))MaBbPcSidCeSfTig, wherein X1 represents Co and/or Ni; X2 represents at least one selected from group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O, and rare earth elements; M represents at least one selected from group consisting of Nb, Hf, Zr, Ta, Mo, W, and V; 0.020?a?0.14, 0.020<b?0.20, 0<c?0.15, 0?d?0.060, 0?e?0.040, 0?f?0.010, 0?g?0.0010, ??0, ??0, and 0??+??0.50 are satisfied, wherein at least one of f and g is more than 0; and wherein soft magnetic alloy has a nano-heterostructure with initial fine crystals present in an amorphous substance; and surface of each of the soft magnetic alloy particles is covered with a coating portion including a compound of at least one element selected from group consisting of P, Si, Bi, and Zn.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: August 3, 2021
    Assignee: TDK CORPORATION
    Inventors: Masakazu Hosono, Hiroyuki Matsumoto, Kenji Horino, Kazuhiro Yoshidome, Isao Nakahata, Akito Hasegawa, Hajime Amano
  • Patent number: 11053574
    Abstract: A non-oriented electrical steel sheet according to an aspect of the present invention contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.2% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, one or more of La, Ce, Pr, and Nd: 0.0005% to 0.0200% in total, Ca: 0.0005% to 0.0100%, Ti: 0.0005% to 0.0100%, Sn: 0% to 0.10%, Sb: 0% to 0.10%, Mg: 0% to 0.0100%, and a remainder including Fe and impurities, in which Si?0.5×Mn: 2.0% or more, and Si+0.5×Mn: 3.8% or more.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: July 6, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
  • Patent number: 10889875
    Abstract: A grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet, wherein a total area percentage of defective parts scattered on the forsterite film is less than 1.5% relative to a surface area of the forsterite film when viewed from above the surface, and methods for evaluating a grain oriented electrical steel sheet comprising a grain oriented electrical steel sheet having a surface and a forsterite film formed on the surface of the steel sheet.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: January 12, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Masayasu Nagoshi, Tomohiro Matsushima, Makoto Watanabe, Shigehiro Takajo, Toshito Takamiya, Masanori Uesaka, Takashi Terashima
  • Patent number: 10872716
    Abstract: In order to provide a soft magnetic flaky powder that is used primarily in a member for an RFID and that has the high real part ?? of a magnetic permeability and the low imaginary part ?? of the magnetic permeability even when having an average particle diameter of 30 ?m or more, and a method for producing the soft magnetic flaky powder, the present invention provides a soft magnetic flaky powder obtained by flattening-treatment of a soft magnetic powder, in which an average particle diameter is more than 30 ?m, a coercive force measured by applying a magnetic field in the longitudinal direction of the flaky powder is in a range of 240 to 640 A/m, a saturation magnetization is 1.0 T or more, and an aspect ratio is 30 or more, and a method for producing the soft magnetic flaky powder.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: December 22, 2020
    Assignee: Sanyo Special Steel Co., Ltd.
    Inventors: Fumihiro Maezawa, Toshiyuki Sawada
  • Patent number: 10822678
    Abstract: When a non-oriented electrical steel sheet is produced by hot rolling a slab containing, by mass %, C: not more than 0.0050%, Si: 1.5-5.0%, Mn: 0.20-3.0%, sol. Al: not more than 0.0050%, P: not more than 0.2%, S: not more than 0.0050% and N: not more than 0.0040% to form a hot rolled sheet, cold rolling the hot rolled sheet without conducting a hot band annealing and then subjecting to a finish annealing, a compositional ratio of CaO in oxide-based inclusions existing in the slab defined by CaO/(SiO2+Al2O3+CaO) is set to not less than 0.4 and/or a compositional ratio of Al2O3 defined by Al2O3/(SiO2+Al2O3+CaO) is set to not less than 0.3, and a coiling temperature in the hot rolling is set to not lower than 650° C.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: November 3, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Tadashi Nakanishi, Hiroaki Nakajima, Tomoyuki Okubo, Yoshihiko Oda
  • Patent number: 10662491
    Abstract: A grain-oriented electrical steel sheet comprising a steel sheet having a surface on which grooves, in which an extending direction crosses a rolling direction and a depth direction is parallel to a sheet thickness direction, are formed, and wherein a molten solidified substance ranging in parallel to the groove exists on both sides of the groove on the surface of the steel sheet, and a height becoming a maximum frequency in a height distribution of height data in which the surface of the steel sheet in a specific area including the groove is measured at regular intervals is set as a virtual plane, and a value of V2/V1 is more than 0.10 and less than 0.80, wherein V1 is a space volume of recess parts recessed from the virtual plane and V2 is a volume of projection parts projected from the virtual plane.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: May 26, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takahito Mizumura, Fumiaki Takahashi, Masato Mizokami, Hisashi Mogi, Hideyuki Hamamura, Hirofumi Imai, Shinya Hayashi, Kenichi Murakami
  • Patent number: 10622848
    Abstract: A material comprises at least one layer of a plurality of domains, each domain being flattened in a first direction and elongated in a second direction normal to the first direction. The flattened and elongated domains define an anisotropic microstructure that facilitates a magnetic flux flow in the second direction.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: April 14, 2020
    Assignee: Persimmon Technologies, Corp.
    Inventors: Martin Hosek, Jayaraman Krishnasamy
  • Patent number: 10449636
    Abstract: A pipeline is a pipeline having plural weld zones in which ends of plural steel pipes are joined by welding, the plural steel pipes are produced from plural charges of molten steel having one or more steel compositions; yield point elongation is not present on a stress-strain curve obtained when stress is applied in a longitudinal direction of each of the steel pipes; a thickness of each of the steel pipes t (mm) and an average pipe outside-diameter D (mm) satisfy t/D×100?6; and in the plurality of the weld zones, ?YS which is a yield strength difference between one steel pipe and the other steel pipe that are welded to each other (MPa), and YR representing a yield ratio that is a ratio of the yield strength to tensile strength of a pipe having a low yield strength out of the one steel pipe and the other steel pipe, satisfy ?YS??1.75×YR+230.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: October 22, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yukinobu Nagata, Eiji Tsuru, Yasuhiro Shinohara
  • Patent number: 10395806
    Abstract: A grain-oriented electrical steel sheet, on which magnetic domain refining treatment by strain application has been performed, has an insulating coating with excellent insulation properties and corrosion resistance. In a grain-oriented electrical steel sheet, linear strain having been applied thereto by irradiation with a high-energy beam, the linear strain extending in a direction that intersects a rolling direction of the steel sheet, an area ratio of irradiation marks within an irradiation region of the high-energy beam is 2% or more and 20% or less, an area ratio of protrusions with a diameter of 1.5 ?m or more within a surrounding portion of the irradiation mark is 60% or less, and an area ratio of exposed portions of steel substrate in the irradiation mark is 90% or less.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: August 27, 2019
    Assignee: JFE Steel Corporation
    Inventors: Hirotaka Inoue, Shigehiro Takajo, Hiroi Yamaguchi, Seiji Okabe, Kazuhiro Hanazawa
  • Patent number: 10364477
    Abstract: Processes for producing continuous bulk forms of iron-silicon alloys and bulk forms produced thereby. Such a bulk form is continuous in a longitudinal direction thereof and has a continuous cross-sectional form transverse to the longitudinal direction. The bulk form is formed of an Fe—Si alloy and has a crystallographic texture that comprises <111> and {110} fibers that are inclined relative to the longitudinal direction. The bulk form may be produced by a process that includes deforming a solid body formed of an Fe—Si alloy with a cutting tool in a single step to continuously produce a continuous bulk form from material obtained from the solid body.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: July 30, 2019
    Assignee: Purdue Research Foundation
    Inventors: Andrew Benjamin Kustas, Dinakar Sagapuram, Kevin Paul Trumble, Srinivasan Chandrasekar
  • Patent number: 10242782
    Abstract: According to the present invention, a high-strength electrical steel sheet that is suitable as rotor material for a high speed motor, steadily has high strength, and also has excellent magnetic properties can be obtained by setting the chemical composition thereof to include, by mass %, C: 0.005% or less, Si: more than 3.5% and 4.5% or less, Mn: 0.01% or more and 0.10% or less, Al: 0.005% or less, Ca: 0.0010% or more and 0.0050% or less, S: 0.0030% or less, and N: 0.0030% or less, Ca/S being 0.80 or more, the balance being Fe and incidental impurities, and by setting the sheet thickness to 0.40 mm or less, the non-recrystallized deformed microstructure to 10% or more and 70% or less, tensile strength (TS) to 600 MPa or more, and iron loss W10/400 to 30 W/kg or less.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: March 26, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Hiroaki Toda, Tadashi Nakanishi, Masaaki Kohno, Yoshihiko Oda
  • Patent number: 10236105
    Abstract: The invention relates to high magnetic induction oriented silicon steel and a preparation method thereof. The oriented silicon steel comprises the following chemical elements by weight percent: 0.035-0.120% of C, 2.9-4.5% of Si, 0.05-0.20% of Mn, 0.005-0.050% of P, 0.005-0.012% of S, 0.015-0.035% of Als, 0.001-0.010% of N, 0.05-0.30% of Cr, 0.005-0.090% of Sn, not more than 0.0100% of V, not more than 0.0100% of Ti, at least one of trace elements of Sb, Bi, Nb and Mo, and the balance of Fe and other inevitable impurities, wherein Sb+Bi+Nb+Mo is 0.0015-0.0250% and (Sb/121.8+Bi/209.0+Nb/92.9+Mo/95.9)/(Ti/47.9+V/50.9) ranges from 0.1 to 15.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: March 19, 2019
    Assignee: BAOSHAN IRON & STEEL CO., LTD
    Inventors: Huabing Zhang, Guobao Li, Xijiang Lu, Yongjie Yang, Zhuochao Hu, Kanyi Shen, Jiaqiang Gao, Meihong Wu
  • Patent number: 9881720
    Abstract: Increasing the chromium content of an electrical steel substrate to a level greater than or equal to about 0.45 weight percent (wt %) produced a much improved forsterite coating having superior and more uniform coloration, thickness and adhesion. Moreover, the so-formed forsterite coating provides greater tension potentially reducing the relative importance of any secondary coating.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: January 30, 2018
    Assignee: AK Steel Properties, Inc.
    Inventors: Jerry William Schoen, Kimani Tirawa Partin, Christopher Mark Wilkins
  • Patent number: 9803139
    Abstract: A method for selectively removing an aluminum-silicon coating fired on a surface of a metallic structure is described. The method includes the step of contacting the coating with molten potassium hydroxide (KOH), under conditions sufficient to remove the coating without substantially affecting the metallic surface. Methods for preparing a magnetic component are also described. They involve masking pre-selected regions of the surface of the component, using an aluminum-silicon coating that is fired onto the surface, prior to a nitriding step. The coating is then removed according to the procedure outlined herein.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: October 31, 2017
    Assignee: General Electric Company
    Inventors: Peter John Bonitatibus, Jr., Francis Johnson, Min Zou
  • Patent number: 9659693
    Abstract: A silicon steel sheet (1) containing Si is cold-rolled. Next, a decarburization annealing (3) of the silicon steel sheet (1) is performed so as to cause a primary recrystallization. Next, the silicon steel sheet (1) is coiled so as to obtain a steel sheet coil (31). Next, an annealing (6) of the steel sheet coil (31) is performed through batch processing so as to cause a secondary recrystallization. Next, the steel sheet coil (31) is uncoiled and flattened. Between the cold-rolling and the obtaining the steel sheet coil (31), a laser beam is irradiated a plurality of times at predetermined intervals on a surface of the silicon steel sheet (1) from one end to the other end of the silicon steel sheet (1) along a sheet width direction (2). When the secondary recrystallization is caused, grain boundaries passing from a front surface to a rear surface of the silicon steel sheet (1) along paths of the laser beams are generated.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: May 23, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Tatsuhiko Sakai, Koji Hirano, Satoshi Arai, Yoshiyuki Ushigami
  • Patent number: 9637812
    Abstract: A non-oriented electrical steel sheet contains 2.8 mass % or more and 4.0 mass % or less of Si, 0.2 mass % or more and 3.0 mass % or less of Al, and 0.02 mass % or more and 0.2 mass % or less of P. The non-oriented electrical steel sheet contains further contains 0.5 mass % or more in total of at least one kinds selected from a group consisting of 4.0 mass % or less of Ni and 2.0 mass % or less of Mn. A C content is 0.05 mass % or less, a N content is 0.01 mass % or less, an average grain diameter is 15 ?m or less, and a <111> axial density is 6 or larger.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: May 2, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Takeshi Kubota
  • Patent number: 9570219
    Abstract: This oriented electrical steel sheet is a non-oriented electrical steel sheet consisting of, in mass %: C: not less than 0.0001% and not more than 0.0040%, Si: more than 3.0% and not more than 3.7%, sol.Al: not less than 0.3% and not more than 1.0%, Mn: not less than 0.5% and not more than 1.5%, Sn: not less than 0.005% and not more than 0.1%, Ti: not less than 0.0001% and not more than 0.0030%, S: not less than 0.0001% and not more than 0.0020%, N: not less than 0.0001% and not more than 0.003%, Ni: not less than 0.001% and not more than 0.2%, P: not less than 0.005% and not more than 0.05%, with a balance consisting of Fe and impurities, in which a resistivity ? at room temperature ?60 ??cm, and saturation magnetic flux density Bs at room temperature ?1.945 T are established, and the components contained satisfy 3.5?Si+(?)×sol.Al+(?)×Mn?4.25.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: February 14, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yoshiaki Natori, Kenichi Murakami, Takeaki Wakisaka, Hisashi Mogi, Takuya Matsumoto, Tomoji Shono, Tatsuya Takase, Junichi Takaobushi
  • Patent number: 9222145
    Abstract: A method for producing a soft magnetic alloy ribbon having a composition represented by Fe100-x-y-zAxByXz, wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, and x, y and z are numbers (by atomic %) meeting the conditions of 0<x?5, 10?y?22, 1?z?10, and x+y+z?25, and comprising a matrix phase in which fine crystal grains having an average diameter of 60 nm or less are dispersed at a volume fraction of 50% or more, part of an oxide film formed on the surface being a layer having a lower B concentration than the average B concentration of the matrix phase; comprising the steps of (1) ejecting an alloy melt having the above composition onto a rotating cooling roll for quenching, to form a primary fine-crystalline alloy ribbon having a matrix phase, in which fine crystal nuclei having an average diameter of 30 nm or less are dispersed at a volume fraction of more than 0% and less than 30% in an amorphous phase; and then (2) annealing the pr
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: December 29, 2015
    Assignee: HITACHI METALS, LTD.
    Inventors: Motoki Ohta, Yoshihito Yoshizawa
  • Patent number: 9013274
    Abstract: An article, system and method related to a magnetomechanical marker used to mark stationary assets. Magnetomechanical markers can be arranged in clusters and associated with stationary assets, including assets buried underground. Markers can be associated with an asset by being attached to the asset, arranged in a particular spatial relationship with the asset, or in any other appropriate way. A portable locating device can be used to generate an alternating magnetic field to activate the magnetomechanical marker and thus locate the asset.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: April 21, 2015
    Assignee: 3M Innovative Properties Company
    Inventors: Ziyad H. Doany, Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce, Jr.
  • Patent number: 8999075
    Abstract: A composite magnetic material manufactured by mixing a metal magnetic powder with an insulating binder to produce a mixed powder, press-molding the mixed powder to produce a molded product, and heat-treating the molded product in an oxidizing atmosphere at not lower than 80° C. and not higher than 400° C. to form an oxide film on a surface of the molded product. The metal magnetic powder includes Si, Fe, and component A, and the composition thereof satisfies 5.5%?Si?9.5%, 10%?Si+component A?13.5%, and the remainder is Fe, where % denotes weight %. The component A includes at least one of Ni, Al, Ti, and Mg.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: April 7, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Nobuya Matsutani, Takeshi Takahashi
  • Publication number: 20150064481
    Abstract: Increasing the chromium content of an electrical steel substrate to a level greater than or equal to about 0.45 weight percent (wt %) produced a much improved forsterite coating having superior and more uniform coloration, thickness and adhesion. Moreover, the so-formed forsterite coating provides greater tension potentially reducing the relative importance of any secondary coating.
    Type: Application
    Filed: August 26, 2014
    Publication date: March 5, 2015
    Inventors: Jerry William Schoen, Kimani Tirawa Partin, Christopher Mark Wilkins
  • Patent number: 8951364
    Abstract: The invention relates to an Fe—Co alloy, the composition of which comprises in % by weight: 6?Co+Ni?22 Si?0.2 0.5?Cr?8 Ni?4 0.10?Mn?0.90 Al?4 Ti?1 C?1 Mo?3 V+W?3 Nb+Ta?1 Si+Al?6 O+N+S+P+B?0.1 the balance of the composition consisting of iron and inevitable impurities due to the smelting, it being furthermore understood that the contents thereof satisfy the following relationships: Co+Si?Cr?27 Si+Al+Cr+V+Mo+Ti?3.5 1.23(Al+Mo)+0.84(Si+Cr+V)?1.3 14.5(Al+Cr)+12(V+Mo)+25 Si?50.
    Type: Grant
    Filed: January 14, 2009
    Date of Patent: February 10, 2015
    Assignee: Aperam Alloys Imphy
    Inventors: Thierry Waeckerle, Herve Fraisse
  • Publication number: 20150034212
    Abstract: A non-oriented electrical steel sheet with fine magnetic performance, and a calcium treatment method therefor, including an RH (Ruhrstahl-Heraeus) refinement step. The RH refinement step sequentially comprises a decarbonization step, an aluminum deoxidation step, and a step of adding calcium alloy. In the step of adding calcium alloy, time when the calcium alloy is added satisfies the following condition: time interval between Al and Ca/total time after ?Al=0.2-0.8. In this method, production cost is reduced, the production process is simple, a normal processing cycle of RH refinement is not affected, the device is convenient in operation and is controllable, and foreign substances are controllable in both shape and quantities. The non-oriented electrical steel sheet prepared according to the present invention has fine magnetic performance, and the method can be used for mass production of the non-oriented electrical steel sheet with fine magnetic performance.
    Type: Application
    Filed: March 27, 2012
    Publication date: February 5, 2015
    Applicant: Baoshan Iron & Steel Co., Ltd.
    Inventors: Feng Zhang, Xiandong Liu, Shishu Xie, Xuejun Lu, Xiao Chen, Aihua Ma, Peili Zhang, Yanwei Wang, Lan Zhang, Hongxu Hei
  • Publication number: 20150013844
    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: Application
    Filed: December 11, 2012
    Publication date: January 15, 2015
    Inventors: Shishu Xie, Xiandong Liu, Xiao Chen, Hongxu Hei, Bo Wang, Aihua Ma, Liang Zou, Huawei Zhang, Wei Cao, Feng Zhang, Junliang Liu
  • Publication number: 20150013850
    Abstract: An electrical steel sheet has a composition including C: less than 0.010 mass %, Si: 1.5˜10 mass % and the balance being Fe and incidental impurities, wherein a main orientation in a texture of a steel sheet is <111>//ND and an intensity ratio relative to randomly oriented specimen of the main orientation is not less than 5 and, preferably an intensity ratio relative to randomly oriented specimen of {111}<112> orientation is not less than 10, an intensity ratio relative to randomly oriented specimen of {310}<001> orientation is not more than 3 and Si concentration has a gradient that it is high at a side of a surface layer and low at a central portion in the thickness direction and a maximum value of the Si concentration is not less than 5.5 mass % and a difference between maximum and minimum values is not less than 0.5 mass %.
    Type: Application
    Filed: January 22, 2013
    Publication date: January 15, 2015
    Inventors: Takeshi Imamura, Minoru Takashima, Tatsuhiko Hiratani
  • Publication number: 20150000793
    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: Application
    Filed: December 28, 2012
    Publication date: January 1, 2015
    Inventors: Junesoo Park, Byung-Keun Bae, Yong-Soo Kim, Su-Yong Sin
  • Publication number: 20150000794
    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: Application
    Filed: March 29, 2012
    Publication date: January 1, 2015
    Applicant: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Liang Zou, Bo Wang, Xiandong Liu, Aihua Ma, Shishu Xie, Hongxu Hei
  • Publication number: 20140373340
    Abstract: A higher-strength, non-grain-oriented electrical strip with high polarization, the electrical strip consisting of a steel alloy, wherein the limits of the following elements are maintained: Mn between 0.35 mass % and 0.65 mass %, Si between 2.0 mass % and 3.0 mass %, Al between 0.8 mass % and 1.4 mass %, and P between 0.14 mass % and 0.24 mass %; and a method for the production thereof.
    Type: Application
    Filed: September 17, 2012
    Publication date: December 25, 2014
    Inventors: Franz Dorninger, Roman Sonnleitner, Herbert Kreuzer
  • Publication number: 20140366988
    Abstract: A method for producing a higher-strength, non-grain-oriented electrical strip, according to which a slab is cast from a molten mass, the slab is hot-rolled and then cold-rolled—optionally a hot-strip annealing can be carried out between the hot-rolling and the cold-rolling —and the cold strip is annealed in order to produce a partially recrystallized structure so that the mechanical strength values ReH can be set within the range of 450 MPa to 850 MPa at an annealing temperature of between 600° C. and 800° C. for 60 s to 300 s.
    Type: Application
    Filed: September 17, 2012
    Publication date: December 18, 2014
    Inventors: Franz Dorninger, Roman Sonnleitner, Herbert Kreuzer
  • Publication number: 20140366989
    Abstract: The purpose of the present invention is to provide a high silicon steel sheet having excellent productivity and magnetic properties and a method for manufacturing the same.
    Type: Application
    Filed: December 20, 2012
    Publication date: December 18, 2014
    Inventors: Byung-Deug Hong, Jin-Mo Koo, Jae-Kon Lee, Sung-Jin Park, Sang-Hoon Kim
  • Patent number: 8911574
    Abstract: A method for manufacturing high-Si cold rolled steel sheets includes heating a cold rolled steel sheet with a direct flame burner (A) having an air ratio of not more than 0.89 when the temperature of the cold rolled steel sheet that is being increased is in the temperature range of not less than 300° C. and less than Ta° C., subsequently heating the cold rolled steel sheet with a direct flame burner (B) having an air ratio of not less than 0.95 when the temperature of the cold rolled steel sheet is in the temperature range of not less than Ta° C. and less than Tb° C., and subsequently soak-annealing the cold rolled steel sheet in a furnace having an atmospheric gas composition which has a dew point of not more than ?25° C. and contains 1 to 10 volume % of H2 and the balance of N2.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: December 16, 2014
    Assignee: JFE Steel Corporation
    Inventors: Shinji Ootsuka, Junichiro Hirasawa, Hideyuki Takahashi, Naoto Yoshimi, Hideki Nagano
  • Publication number: 20140360629
    Abstract: A grain-oriented electrical steel sheet, on which magnetic domain refining treatment by strain application has been performed, has an insulating coating with excellent insulation properties and corrosion resistance. In a grain-oriented electrical steel sheet, linear strain having been applied thereto by irradiation with a high-energy beam, the linear strain extending in a direction that intersects a rolling direction of the steel sheet, an area ratio of irradiation marks within an irradiation region of the high-energy beam is 2% or more and 20% or less, an area ratio of protrusions with a diameter of 1.5 ?m or more within a surrounding portion of the irradiation mark is 60% or less, and an area ratio of exposed portions of steel substrate in the irradiation mark is 90% or less.
    Type: Application
    Filed: December 27, 2012
    Publication date: December 11, 2014
    Inventors: Hirotaka Inoue, Shigehiro Takajo, Hiroi Yamaguchi, Seiji Okabe, Kazuhiro Hanazawa
  • Publication number: 20140345751
    Abstract: A non-oriented electrical steel sheet has a chemical composition including, in mass %, C: 0.005% or less, Si: 5% or less, Al: 3% or less, Mn: 5% or less, S: 0.005% or less, P: 0.2% or less, N: 0.005% or less, Mo: 0.001 to 0.04%, Ti: 0.0030% or less, Nb: 0.0050% or less, V: 0.0050% or less, Zr: 0.0020% or less, one or both of Sb and Sn: 0.001 to 0.1% in total, and the balance being iron and incidental impurities.
    Type: Application
    Filed: September 26, 2012
    Publication date: November 27, 2014
    Inventors: Yoshihiko Oda, Hiroaki Toda, Tadashi Nakanishi, Yoshiaki Zaizen
  • Publication number: 20140326364
    Abstract: Embodiments of the present invention comprise; annealing steel sheets (e.g., hot rolled steel sheets or thin cast strip steel); cold rolling the sheets in one or more cold rolling passes (e.g., with an annealing steep between multiple cold rolling passes); 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 step between the final cold rolling pass and the tension leveling, the rough rolling, or the coating process. In order to achieve the desired properties for the steel sheet, stamping and final annealing may be performed. The new process provides an electrical steel with the similar, same, or better magnetic properties than an electrical steel manufactured using the traditional processing that utilizes an intermediate annealing step after cold rolling and before the stamping and final annealing.
    Type: Application
    Filed: July 17, 2014
    Publication date: November 6, 2014
    Inventors: Theodore E. Hill, Eric E. Gallo
  • Publication number: 20140299233
    Abstract: A method for manufacturing a strip in a soft magnetic alloy capable of being cut out mechanically, the chemical composition of which comprises by weight: 18%?Co?55% 0%?V+W?3% 0%?Cr?3% 0%?Si?3% 0%?Nb?0.5% 0%?B?0.05% 0%?C?0.1% 0%?Zr+Ta?0.5% 0%?Ni?5% 0%?Mn?2% The remainder being iron and impurities resulting from the elaboration, according to which a strip obtained by hot rolling is cold-rolled in order to obtain a cold-rolled strip with a thickness of less than 0.6 mm. After cold rolling, a continuous annealing treatment is carried out by passing into a continuous oven, at a temperature comprised between the order/disorder transition temperature of the alloy and the onset temperature of ferritic/austenitic transformation of the alloy, followed by rapid cooling down to a temperature below 200° C. Strip obtained.
    Type: Application
    Filed: December 17, 2012
    Publication date: October 9, 2014
    Applicant: APERAM
    Inventors: Thierry Waeckerle, Remy Batonnet
  • Publication number: 20140283953
    Abstract: Method for producing a soft magnetic alloy strip suited to be mechanically cut, having a chemical composition comprising, by weight: 18% ?? Co ? 55%? 0% ? V + W ? 3% 0% ? Cr ? 3% 0% ? Si ? 3% 0% ? Nb ? 0.5%? 0% ? B ? 0.05%?? 0% ? C ? 0.1%? 0% ? Zr + Ta ? 0.5%? 0% ? Ni ? 5% 0% ? Mn ? 2% the rest being iron and impurities from production, according to which a strip obtained by hot rolling a semi-finished product consisting of the alloy is cold-rolled to obtain a cold-rolled strip with a thickness less than 0.6 mm, After the cold rolling, the strip is running annealed by passing it through a continuous furnace at a temperature between the order/disorder transition temperature of the alloy and the ferritic/austenitic transformation point of the alloy, followed by rapid cooling to a temperature below 200° C.
    Type: Application
    Filed: December 16, 2011
    Publication date: September 25, 2014
    Applicant: APERAM
    Inventors: Thierry Waeckerle, Remy Batonnet
  • Patent number: 8840734
    Abstract: A non-oriented electrical steel sheet, containing: C: 0.01 mass % or less; Si: 1.0 mass % or more and 3.5 mass % or less; Al: 0.1 mass % or more and 3.0 mass % or less; Mn: 0.1 mass % or more and 2.0 mass % or less; P: 0.1 mass % or less; S: 0.005 mass % or less; Ti: 0.001 mass % or more and 0.01 mass % or less; N: 0.005 mass % or less; and Y: more than 0.05 mass % and 0.2 mass % or less, with the balance being iron and inevitable impurities.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: September 23, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Masafumi Miyazaki, Hideaki Yamamura, Kazuto Kawakami
  • Publication number: 20140251500
    Abstract: New magnetic materials containing cerium, iron, and small additions of a third element are disclosed. These materials comprise compounds Ce(Fe12?xMx) where x=1-4, having the ThMn12 tetragonal crystal structure (space group I4/mmm, #139). Compounds with M=B, Al, Si, P, S, Sc, Co, Ni, Zn, Ga, Ge, Zr, Nb, Hf, Ta, and W are identified theoretically, and one class of compounds based on M=Si has been synthesized. The Si cognates are characterized by large magnetic moments (4?Ms greater than 1.27 Tesla) and high Curie temperatures (264?Tc?305° C.). The Ce(Fe12?xMx) compound may contain one or more of Ti, V, Cr, and Mo in combination with an M element. Further enhancement in Tc is obtained by nitriding the Ce compounds through heat treatment in N2 gas while retaining the ThMn12 tetragonal crystal structure; for example CeFe10Si2N1.29 has Tc=426° C.
    Type: Application
    Filed: March 6, 2013
    Publication date: September 11, 2014
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: CHEN ZHOU, FREDERICK E. PINKERTON, JAN F. HERBST
  • Publication number: 20140251514
    Abstract: In a method of producing a grain-oriented electrical steel sheet by hot rolling a steel slab comprising C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜1.0 mass %, one or two of S and Se: 0.01˜0.05 mass % in total, sol. Al: 0.003˜0.050 mass % and N: 0.001˜0.020 mass %, cold rolling, subjecting to primary recrystallization annealing, applying an annealing separator and finally subjecting to final annealing, the primary recrystallization annealing is conducted so as to control a heating rate S1 between 500 and 600° C. to not less than 100° C./s and a heating rate S2 between 600 and 700° C. to not less than 30° C./s but not more than 0.6×S1, and as a main ingredient of the annealing separator is used MgO having an expected value ?(A) of citric acid activity distribution of 3.5˜3.8, a cumulative frequency F of 25˜45% when an activity A is not less than 4.0.
    Type: Application
    Filed: October 16, 2012
    Publication date: September 11, 2014
    Applicant: JFE STEEL CORPORATION
    Inventors: Makoto Watanabe, Yukihiro Shingaki, Toshito Takamiya, Tomoyuki Okubo
  • Publication number: 20140238558
    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: Application
    Filed: November 9, 2012
    Publication date: August 28, 2014
    Inventors: Masahiro Fujikura, Yoshiyuki Ushigami, Tesshu Murakawa, Shinichi Kanao, Makoto Atake, Takeru Ichie, Kojiro Hori
  • Publication number: 20140216606
    Abstract: The present invention relates to a non-oriented electrical steel strip, which is used as a core for electrical devices such as motors and transformers, and a production method thereof. In accordance with one embodiment of the invention, there is provided a method for producing a (100) [0vw] non-oriented electrical steel strip having excellent magnetic properties, in which a slab having a composition comprising 0.0001-0.035 wt % of S and the balance of Fe and inevitable impurities, thereby showing a ferrite structure throughout the entire temperature range, is hot-rolled, pickled and cold-rolled, and the cold-rolled steel strip is annealed so that the selective growth of (100) grains on the surface of the cold-rolled steel strip occurs and the surface of the annealed steel strip is composed of the (100) [0vw] orientation.
    Type: Application
    Filed: January 17, 2013
    Publication date: August 7, 2014
    Inventors: Yoon-Jung Heo, Nam-Hoe Heo, Kyoung-Soon Park, Dong-Hoe Heo, Sun-Mi Kwoun, Hyuk-Ki Kwoun
  • Patent number: 8790471
    Abstract: A silicon steel sheet (1) containing Si is cold-rolled. Next, a decarburization annealing (3) of the silicon steel sheet (1) is performed so as to cause a primary recrystallization. Next, the silicon steel sheet (1) is coiled so as to obtain a steel sheet coil (31). Next, an annealing (6) of the steel sheet coil (31) is performed through batch processing so as to cause a secondary recrystallization. Next, the steel sheet coil (31) is uncoiled and flattened. Between the cold-rolling and the obtaining the steel sheet coil (31), a laser beam is irradiated a plurality of times at predetermined intervals on a surface of the silicon steel sheet (1) from one end to the other end of the silicon steel sheet (1) along a sheet width direction (2). When the secondary recrystallization is caused, grain boundaries passing from a front surface to a rear surface of the silicon steel sheet (1) along paths of the laser beams are generated.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: July 29, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Tatsuhiko Sakai, Koji Hirano, Satoshi Arai, Yoshiyuki Ushigami
  • Publication number: 20140166159
    Abstract: The invention provides a La(Fe,Si)13-based magnetic refrigeration material prepared from industrial-pure mischmetal as the raw material, wherein the industrial-pure mischmetal is impurity-containing and naturally proportionated La—Ce—Pr—Nd mischmetal or LaCe alloy which, as the intermediate product during rare earth extraction, is extracted from light rare earth ore. The invention further provides the preparation method and use of the material, wherein the preparation method comprises the steps of smelting and annealing industrial-pure mischmetal as the raw material to prepare the La(Fe,Si)13-based magnetic refrigeration material. The presence of impurities in the industrial-pure mischmetal has no impact on the formation of the 1:13 phase, the presence of the first-order phase-transition property and metamagnetic behavior, and thus maintains the giant magnetocaloric effect of the magnetic refrigeration material.
    Type: Application
    Filed: July 13, 2012
    Publication date: June 19, 2014
    Inventors: Ling Chen, Fengxia Hu, Jing Wang, Lifu Bao, Yingying Zhao, Baogen Shen, Jirong Sun, Huayang Gong
  • Patent number: 8715430
    Abstract: The present invention provides high strength steel plate and high strength welded pipe excellent in ductile fracture characteristic and methods of production of the same, that is, high strength steel plate excellent in ductile fracture characteristic, and high strength welded pipe using that steel plate as a base material, having a tensile strength corresponding to the X100 class of the API standard, containing, by mass %, C: 0.01 to 0.5%, Si: 0.01 to 3%, Mn: 0.1 to 5%, P: 0.03% or less, and S: 0.03% or less and a balance of Fe and unavoidable impurities, having a microstructure comprised of, by area ratio, 1 to 60% of ferrite and the balance of bainite and martensite, having a maximum value of the {100} accumulation degree of the cross-section rotated 20 to 50° from the plate thickness cross-section about the rolling direction as an axis of 3 or less, and having plate thickness parallel cracks measured by ultrasonic flaw detection of less than 1 mm.
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: May 6, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Takuya Hara, Yasuhiro Shinohara, Hitoshi Asahi, Yoshio Terada