Patents Examined by Deborah Yee
  • Nickel-free stainless steel stent
    Patent number: 9320622
    Abstract: A nickel-free stainless steel stent using a stainless steel which does not substantially contain Ni in the stainless steel, has a metal allergy onset-preventing effect, and is excellent in terms of precision workability, strength, and ductility, is provided. The nickel-free stainless steel stent is characterized by using a stainless steel containing, as a chemical composition, from 15 to 30% by mass of Cr, from 0.97 to 2% by mass of Mo, and from 0.5 to 1% by mass of N, with the remainder being Fe, and optionally containing inevitable impurities.
    Type: Grant
    Filed: November 25, 2011
    Date of Patent: April 26, 2016
    Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Tetsushi Taguchi, Yasuyuki Katada, Ryozo Nagai, Ichiro Manabe, Katsuhito Fujiu
  • Compositions and methods for determining alloys for thermal spray, weld overlay, thermal spray post processing applications, and castings
    Patent number: 9309585
    Abstract: Disclosed herein are iron-based alloys having a microstructure comprising a fine-grained ferritic matrix and having a 60+ Rockwell C surface, wherein the ferritic matrix comprises <10 ?m Nb and W carbide precipitates. Also disclosed are methods of welding comprising forming a crack free hardbanding weld overlay coating with such an iron-based alloy. Also disclosed are methods of designing an alloy capable of forming a crack free hardbanding weld overlay, the methods comprising the steps of determining an amorphous forming epicenter composition, determining a variant composition having a predetermined change in constituent elements from the amorphous forming epicenter composition, and forming and analyzing an alloy having the variant composition.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: April 12, 2016
    Assignee: Scoperta, Inc.
    Inventors: Justin Lee Cheney, John Hamilton Madok
  • Case hardening steel, method for producing same, and mechanical structural part using case hardening steel
    Patent number: 9297051
    Abstract: A case hardening steel, which has excellent cold forgeability and excellent crystal grain coarsening prevention characteristics after carburization, contains, in mass %, 0.05-0.20% of C, 0.01-0.1% of Si, 0.3-0.6% of Mn, 0.03% or less of P (excluding 0%), 0.001-0.02% of S, 1.2-2.0% of Cr, 0.01-0.1% of Al, 0.010-0.10% of Ti, 0.010% or less of N (excluding 0%), and 0.0005-0.005% of B, with the balance consisting of iron and unavoidable impurities. The density of Ti-based precipitates having circle-equivalent diameters less than 20 nm in the case hardening steel is 10-100 pieces/?m2; the density of Ti-based precipitates having diameters of 20 nm or more in the case hardening steel is 1.5-10 pieces/?m2; and the case hardening steel has a Vickers hardness of 130 HV or less.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: March 29, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Nariaki Okamoto, Yosuke Shindo
  • Forged steel and welded structure for components for nuclear power plants
    Patent number: 9297056
    Abstract: A forged steel for components for nuclear power plants meets a specific chemical composition. The grain size number of a metal structure thereof is 4.5 to 7.0 in terms of ASTM grain size number. It is preferred that the content of N is 0.0100 mass % or more when the mass ratio (Al/N) of the content of Al to the content of N is 1.93 or more, and that the content of Al is 0.022 mass % or more when the mass ratio (Al/N) of the content of Al to the content of N is less than 1.93. The forged steel for components for nuclear power plants exhibits excellent strength, toughness and hydrogen cracking resistance even after being subjected to a stress relief heat treatment subsequent to welding.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: March 29, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Hiroyuki Takaoka, Nobuyuki Fujitsuna
  • Method of manufacturing material for rotary machine component, method of manufacturing rotary machine component, material for rotary machine component, rotary machine component, and centrifugal compressor
    Patent number: 9297389
    Abstract: A method of manufacturing a material for a rotary machine component, by performing at least a solution treatment on a material made of a duplex stainless steel, wherein, in the solution treatment, the material is heated to a temperature in a range of 950 to 1100° C. and is thereafter cooled to 700° C. at an average cooling rate of equal to or greater than 20° C./min.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: March 29, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Shugo Iwasaki, Yoshikazu Yamada, Shinichiro Tokuyama, Tatsuya Osawa, Seiichi Yarimizu
  • Micro-alloyed carbon steel as a texture-rolled strip steel, in particular for spring elements
    Patent number: 9290832
    Abstract: The invention relates to a cold-rolled carbon steel comprising (in % by weight) C 0.63-0.85%, max. 0.40% Si, 0.20-0.90% Mn, max. 0.035% P, max. 0.035% S, max. 0.060% Al, max. 0.40% Cr, 0.003-0.010% N, preferably 0.005-0.008%, and a maximum of 0.12% of at least one micro-alloying element, the remainder being iron and steel production-related pollutants. Possible micro-alloying elements are Ti, Nb, V and optionally Zr. A carbon steel of the type is cold-rolled into texture-rolled strip steel with a high cold reduction degree and can be used in particular as a material for coiling springs or other components having spring properties.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: March 22, 2016
    Assignee: C.D. Waelzholz GmbH
    Inventors: Hans-Toni Junius, Heino Buddenberg, Michael Hellmann, Dirk Wilmes
  • Weld metal with excellent creep characteristics
    Patent number: 9289859
    Abstract: This weld metal has excellent creep characteristics and has a given chemical composition. In the weld metal, the value A defined by equation (1) is 200 or greater, and carbide particles each having an equivalent-circle diameter of 0.40 ?m or more have an average equivalent-circle diameter less than 0.85 ?m. In the segments that connect the centers of three or more carbide particles which are present on a 6-?m straight line and which each has an equivalent-circle diameter of 0.40 ?m or more, the sum of the lengths of the portions where the segments intersect the carbide particles is 25% or more of the overall length of the segments. Value A=([V]/51+[Nb]/93)/{[V]×([Cr]/5+[Mo]/2)}×104??(1) In the equation, [V], [Nb], [Cr], and [Mo] respectively indicate the contents (mass %) of V, Nb, Cr, and Mo in the weld metal.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: March 22, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Hidenori Nako, Ken Yamashita, Minoru Otsu, Mikihiro Sakata, Genichi Taniguchi
  • High purity ferritic stainless steel sheet excellent in corrosion resistance and anti-glare property
    Patent number: 9289964
    Abstract: An alloy-saving type high purity ferritic stainless steel sheet, comprising a steel sheet which contains, by mass %, C: 0.001 to 0.03%, Si: 0.01 to 1%, Mn: 0.01 to 1.5%, P: 0.005 to 0.05%, S: 0.0001 to 0.01%, Cr: 13 to 30%, N: 0.001 to 0.03%, Al: 0.005 to 1%, and Sn: 0.01 to 1% and has a balance of Fe and unavoidable impurities and which has a surface film, the surface film containing one or both of Al and Si in a total of 5 to 50 at % and Sn, an average concentration of Cr in the surface film being 1.1 to 3 times the concentration of Cr inside the steel sheet, and the surface film having a surface roughness of an arithmetic average roughness Ra of 0.1 to 1.5 ?m.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: March 22, 2016
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Masaharu Hatano, Hiroyuki Matsuyama, Akihito Yamagishi, Naoto Hansaki, Eiichiro Ishimaru
  • Martensitic stainless steel having excellent corrosion resistance
    Patent number: 9284634
    Abstract: A purpose of the present invention is to provide a martensitic stainless steel applicable in environments involving both wet carbon dioxide gas and wet hydrogen sulfide and excellent in weldability, manufacturability, and resistance to strain age hardening. Provided is a martensitic stainless steel having excellent corrosion resistance and resistance to strain age hardening comprising, in percent by mass, 0.02% or less of C, 0.02% or less of N, 0.1 to 0.5% of Si, 0.1 to 0.5% of Mn, 10 to 13% Cr, Ni exceeding 5.0% but 8% or less, 1.5 to 3% of Mo, 0.01 to 0.05% of V, 0.16 to 0.30% of Zr, 0.01 to 0.05% of Ta, and the balance of Fe and unavoidable impurities, wherein the martensitic stainless steel satisfies the condition that the sum of the carbon and the nitrogen exceeds 0.02% but 0.04% or less.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: March 15, 2016
    Assignee: NKK Tubes
    Inventors: Shuji Hashizume, Yusuke Minami, Yu Yamamoto
  • Method of producing a steel component provided with a metallic coating giving protection against corrosion
    Patent number: 9284655
    Abstract: A method by which a steel component can be produced, which is provided with a metallic coating which adheres well and which provides protection against corrosion, from a flat steel product produced from a steel material containing 0.3-3 wt.-% manganese and having a yield point of 150-1100 MPa and a tensile strength of 300-1200 MPa coated with an anti-corrosion coating which comprises a coating of ZnNi alloy which is electrolytically deposited on the flat steel product, which coating is composed in a single phase of ?-ZnNi phase and which contains, as well as zinc and unavoidable impurities, 7-15 wt.-% nickel.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: March 15, 2016
    Assignee: ThyssenKrupp Steel Europe AG
    Inventors: Patrick Kuhn, Manfred Meurer, Jens Kondratiuk, Wilhelm Warnecke, Werner Schuler
  • High speed tool steel, material for blade edge, cutting tool, and manufacturing method of material for blade edge
    Patent number: 9273384
    Abstract: A high speed tool steel containing, by mass percent, 0.5-1.5% of C; 1.0% or less of Si; 1.0% or less of Mn; 3.0-5.0% of Cr; 15.0-25.0% of one or two kinds of W and Mo according to a formula (W+2Mo); 1.0-less than 1.5% of V; 5.0-10.0% of Co; and a remainder including Fe and impurities, the high speed tool steel further containing 0.0005-0.004% of Ca and 0.005-0.015% of N. Also, a material for a blade edge that is made of the high speed tool steel and a cutting tool made by welding the material for the blade edge to a body material. Further, a manufacturing method of the material for the blade edge.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: March 1, 2016
    Assignee: HITACHI METALS, LTD.
    Inventor: Shiho Fukumoto
  • Stainless steel foil and catalyst carrier for exhaust gas purifying device using the foil
    Patent number: 9273382
    Abstract: A stainless steel foil contains, in percent by mass, 0.05% or less of C, 2.0% or less of Si, 1.0% or less of Mn, 0.003% or less of S, 0.05% or less of P, 25.0% to 35.0% of Cr, 0.05% to 0.30% of Ni, 3.0% to 10.0% of Al, 0.10% or less of N, 0.02% or less of Ti, 0.02% or less of Nb, 0.02% or less of Ta, 0.005% to 0.20% of Zr, 0.02% or less of Ce, 0.03% to 0.20% of REM excluding Ce, 0.5% to 6.0% in total of at least one of Mo and W, and the balance being Fe and incidental impurities.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: March 1, 2016
    Assignee: JFE Steel Corporation
    Inventors: Akito Mizutani, Kunio Fukuda, Shin Ishikawa, Atsutaka Honda, Yasuhiro Yamaguchi, Yasushi Kato, Hiroki Ota, Mitsuyuki Fujisawa, Takumi Ujiro, Hideaki Yamashita
  • Low-alloy steel having a high yield strength and a high sulphide-induced stress cracking resistance
    Patent number: 9273383
    Abstract: A steel contains, by weight: C: 0.3% to 0.5%, Si: 0.1% to 0.5%, Mn: 1% or less, P: 0.03% or less, S: 0.005% or less, Cr: 0.3% to 1%, Mo: 1% to 2%, W: 0.3% to 1%, V: 0.03% to 0.25%, Nb: 0.01% to 0.15%, Al: 0.01% to 0.1%, the remainder of the chemical composition of the steel being constituted by Fe and impurities or residuals resulting from or necessary to steel production and casting processes. The steel can be used to produce seamless tubes for hydrocarbon wells with a yield strength after heat treatment of 862 MPa or more or even 965 MPa or more.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: March 1, 2016
    Assignee: VALLOUREC OIL AND GAS FRANCE
    Inventors: Laurent Delattre, Herve Marchebois, Michel Piette, Christoph Bosch, Michaela Hoerstemeier, Joachim Konrad
  • Metal alloys for high impact applications
    Patent number: 9273385
    Abstract: A casting of a white cast iron alloy and a method of producing the casting are disclosed. A white cast alloy is also disclosed. The casting has a solution treated microstructure that comprises a ferrous matrix of retained austenite and chromium carbides dispersed in the matrix, with the carbides comprising 15 to 60% volume fraction of the alloy. The matrix composition comprises: manganese: 8 to 20 wt %; carbon: 0.8 to 1.5 wt %; chromium: 5 to 15 wt %; and iron: balance (including incidental impurities).
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: March 1, 2016
    Assignee: Weir Minerals Australia Ltd
    Inventor: Kevin Dolman
  • Method of producing a hot rolled steel sheet
    Patent number: 9267196
    Abstract: In a hot-rolled sheet, an average value of pole densities of an orientation group {100}<011> to {223}<110>, which is represented by an arithmetic mean of pole densities of orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> in a thickness center portion of a thickness range of ? to ? from a surface of the steel sheet, is 1.0 to 6.5 and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0; and a Lankford value rC in a direction perpendicular to a rolling direction is 0.70 to 1.10 and a Lankford value r30 in a direction that forms 30° with respect to the rolling direction is 0.70 to 1.10.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: February 23, 2016
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Riki Okamoto, Nobuhiro Fujita, Manabu Takahashi, Kunio Hayashi, Tetsuo Kishimoto, Kazuaki Nakano, Takeshi Yamamoto
  • Low iron loss high strength non-oriented electromagnetic steel sheet and method for manufacturing same
    Patent number: 9260764
    Abstract: Provided is a low iron loss high strength non-oriented electromagnetic steel sheet and a method for manufacturing the same. The method comprises hot-rolling a slab comprising 0.005 weight % or less of C, 4.0 weight % or less of Si, 0.1 weight % or less of P, 0.03 weight % or less of S, 0.1 to 2.0 weight % of Mn, 0.3 to 2.0 weight % of Al, 0.003 weight % or less of N, 0.005 weight % or less of Ti, the remainder being Fe and unavoidable impurities, cold-rolling the slab, and finally annealing the slab such that the fractional area of the non-recrystallization tissue at the cross sectional surface of the steel sheet is 50% or lower (not including 0%).
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: February 16, 2016
    Assignee: POSCO
    Inventors: Jae-Song Kim, Jae-Kwan Kim, Su-Yong Sin, Yong-Soo Kim
  • High-strength steel sheet having superior toughness at cryogenic temperatures, and method for manufacturing same
    Patent number: 9255305
    Abstract: According to one aspect, provided is a high-strength steel sheet having superior toughness at cryogenic temperature, comprising, in weight percentage, 0.02 to 0.06% of C, 0.1 to 0.35% of Si, 1.0 to 1.6% of Mn, 0.02% or less (but not 0%) of Al, 0.7 to 2.0% of Ni, 0.4 to 0.9% of Cu, 0.003 to 0.015% of Ti, 0.003 to 0.02% of Nb, 0.01% or less of P, 0.005% or less of S, the remainder being Fe and unavoidable impurities, wherein the high-strength steel sheet satisfies the condition of [Mn]+5.4[Si]+26[Al]+32.8[Nb]<4.3 where [Mn], [Si], [Al], and [Nb] indicate contents of Mn, Si, Al, and Nb in weight percentage, respectively. The steel sheet secures toughness when used as structural steel materials for ships, offshore structures, or the like, or steel materials for tanks for storing and carrying liquefied gases, which are exposed to an extreme low temperature environment.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: February 9, 2016
    Assignee: POSCO
    Inventors: Woo-Gyeom Kim, Sang-Ho Kim, Ki-Hyun Bang, In-Shik Suh
  • Fuel pipe and method of production of same
    Patent number: 9249901
    Abstract: A fuel pipe which is inexpensive and is excellent in salt spray corrosion resistance, characterized by being comprised of a steel pipe member having as a material a ferritic stainless steel which contains, by mass %, C: 0.015% or less, Si: 0.01 to 0.50%, Mn: 0.01 to 0.50%, P: 0.050% or less, S: 0.010% or less, N: 0.015% or less, Al: 0.010 to 0.100%, and Cr: 13.0 to 18.0% and further, one or both of Ti: 0.03 to 0.30% and Nb: 0.03 to 0.30% and a metal fitting part, the metal fitting part and the steel pipe member having between them a crevice structure at the surface which the structure is exposed to a salt spray environment, an opening amount at a crevice part of the crevice structure being 0.2 mm or more, and an inside of the crevice part being coated by electrodeposition.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: February 2, 2016
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Shunji Sakamoto, Toshio Tanoue
  • Ferritic stainless steel sheet excellent in oxidation resistance
    Patent number: 9243306
    Abstract: Ferritic stainless steel sheet which has a high oxidation resistance and scale spallation resistance even at a high temperature near 1000° C., characterized by containing C: 0.020% or less, N: 0.020% or less, Si: over 0.10 to 0.35%, Mn: 0.10 to 0.60%, Cr: 16.5 to 20.0%, Nb: 0.30 to 0.80%, Mo: over 2.50 to 3.50%, and Cu: 1.00 to 2.50%, having an amount of increase of oxidation after a continuous oxidation test in the air at 1000° C. for 200 hours of 4.0 mg/cm2 or less, and having an amount of scale spallation of 1.0 mg/cm2 or less.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: January 26, 2016
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Norihiro Kanno, Yoshiharu Inoue, Junichi Hamada
  • Lead free free-cutting steel
    Patent number: 9238856
    Abstract: A lead free free-cutting steel is described having the following composition in percent by weight: C 0.85-1.2 Si 0.1-0.6 Mn 0.4-1.2 P max 0.05 S 0.04-0.3 Cr max 2 Ni max 1 Mo max 0.5 Cu max 2 Al max 0.1 B max 0.008 Bi+Se+Te max 0.005 Ti+Nb+Zr+V max 0.2 balance Fe and normally occurring impurities. The steel is mainly intended for small/thin dimensions and/or low cutting speeds during manufacture of a product formed of the steel.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: January 19, 2016
    Assignee: Sandvik Intellectual Property AB
    Inventors: Mattias Sandström, Ylva Trogen, Lars Karlsson