Patents Examined by Deborah Yee
  • High-manganese spheroidal graphite cast iron
    Patent number: 8585837
    Abstract: The manufacturing method of high-manganese spheroidal graphite cast iron with exhibiting low magnetism, and excellent wear resistance, castability, and machinability, and having a composition which consists of, 2.5 to 4.0 wt. % of C content, 1.5 to 6.0 wt. % of Si content, 7.0 to 18.0 wt. % of Mn content, and 0.015 to 0.1 wt. % of Mg content, and when the Mn content falls within the range of 7.0 to 10.0 wt. %, consists of 10.0 wt. % or smaller of Ni content, or when the Mn content falls within the range of 10.0 to 18.0 wt. %, consists of Ni content being in the range satisfies the following formula: [Mn wt. %>Ni wt. %], the method comprises heating the above cast iron to the temperature of 1073 to 1373K to decompose the carbides, and then quenching from 1073 to 1273K the resulting cast iron to form a metastable austenite matrix structure that contains no carbide or a reduced amount of carbides.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: November 19, 2013
    Assignee: Hokkou Metal Industry Co., Ltd.
    Inventors: Eiji Otsuki, Toshiharu Kon, Ren Oyake
  • Durable iron-chromium-aluminum alloy showing minor changes in heat resistance
    Patent number: 8580190
    Abstract: An iron-chromium-aluminum alloy having a long service life and exhibiting little change in heat resistance, comprising (as percentages by weight) 4.5 to 6.5% Al, 16 to 24% Cr, 1.0 to 4.0% W, 0.05 to 0.7% Si, 0.001 to 0.5% Mn, 0.02 to 0.1% Y, 0.02 to 0.1% Zr, 0.02 to 0.1% Hf, 0.003 to 0.030% C, 0.002 to 0.03% N, a maximum of 0.01% S, and a maximum of 0.5% Cu, the remainder being iron and the usual steel production-related impurities.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: November 12, 2013
    Assignee: Outokumpu VDM GmbH
    Inventor: Heike Hattendorf
  • Weld metal and welded structure having weld joints using the same
    Patent number: 8574381
    Abstract: To provide weld metal that has a high strength and toughness in the as-welded condition or in the annealed condition. The weld metal of the present invention contains by weight %, C: 0.04-0.15%, Si: 0.50% or less, Mn: 1.0-1.9%, Ni: 1.0-4.0%, Cr: 0.10-1.0%, Mo: 0.20 to 1.2%, Ti: 0.010-0.060%, Al: 0.030% or less, O: 0.15-0.060%, N: 0.010% or less, Fe and inevitable impurities as the remaining contents. The weld metal is further characterized by the fact that the ratio of Ti content (%) to Si content (%) i.e., [compound type Ti]/[compound type Si] is more than 1.5, and the number A defined by the following formula is 0.50 or more, wherein A=[Ti]/([O]?1.1×[Al]+0.05×[Si]).
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: November 5, 2013
    Assignee: Kobe Steel, Ltd.
    Inventors: Hidenori Nako, Yoshitomi Okazaki, Ken Yamashita, Hideaki Takauchi, Minoru Otsu
  • Compositions and methods for determining alloys for thermal spray, weld overlay, thermal spray post processing applications, and castings
    Patent number: 8562759
    Abstract: Disclosed herein are iron-based alloys having a structure comprising 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 step 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: September 17, 2010
    Date of Patent: October 22, 2013
    Assignee: Scoperta, Inc.
    Inventors: Justin Lee Cheney, John Hamilton Madok
  • Steel
    Patent number: 8562761
    Abstract: Steel is described having a chemical composition, in weight-%, of 0.3 to 0.5% carbon (C), from traces to a max. of 1.5% silicon (Si), 0.2 to 1.5% manganese (Mn), 0.01 to 0.2% sulfur (S), 1.5 to 4% chromium (Cr), 1.5 to 5% nickel (Ni), 0.5 to 2% molybdenum (Mo), which at least partially may be replaced by twice as much tungsten (W), 0.2 to 1.5% vanadium (V), from traces to a max. of 0.2% rare earth metals, and a balance essentially of only iron, impurities and accessory elements in normal amounts. In addition, a method for manufacturing a blank of the steel and a process for manufacturing a cutting tool body or holder for cutting tools of the steel is described.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: October 22, 2013
    Assignee: Uddeholms AB
    Inventors: Staffan Gunnarsson, Anna Medvedeva
  • Method for making a low surface roughness cast strip
    Patent number: 8562766
    Abstract: A thin cast strip is formed having at least one microstructure selected from the group consisting of polygonal ferrite, acicular ferrite, Widmanstatten, bainite and martinsite, a surface roughness of less than 1.5 microns Ra and a scale thickness of less than about 10 microns by applying a mixture of water and oil on the work rolls of the hot rolling mill, passing the thin cast strip at a temperature of less than 1100° C. through the hot rolling mill while the mixture of oil and water is applied to the work rolls, and shrouding the thin cast strip from the casting rolls through the hot rolling mill in an atmosphere of less than 5% oxygen to form the thin cast strip.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: October 22, 2013
    Assignee: Nucor Corporation
    Inventors: Walter N. Blejde, Jay Jon Ondrovic
  • Method of heat treating a steel bearing component
    Patent number: 8562767
    Abstract: A bearing component formed from a bearing steel, wherein the component has an outer surface and comprises through-hardened bainite and/or martensite and has a substantially homogeneous chemical composition, at least a part of the bearing component having a compressive residual stress profile comprising ?25 to ?1000 MPa at the near surface, wherein the near surface is defined as a region 500 microns or less below the outer surface.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: October 22, 2013
    Assignee: Aktiebolaget SKF
    Inventors: Ingemar Strandell, Peter Neuman, Berndt Mikael Sundqvist, Steven Lane
  • Compositions and methods for determining alloys for thermal spray, weld overlay, thermal spray post processing applications, and castings
    Patent number: 8562760
    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: November 3, 2010
    Date of Patent: October 22, 2013
    Assignee: Scoperta, Inc.
    Inventors: Justin Lee Cheney, John Hamilton Madok
  • Process for setting the thermal conductivity of a steel, tool steel, in particular hot-work steel, and steel object
    Patent number: 8557056
    Abstract: A tool steel, in particular a hot-work steel, has the following composition: 0.26 to 0.55% by weight C; less than 2% by weight Cr; 0 to 10% by weight Mo; 0 to 15% by weight W; wherein the W and Mo contents in total amount to 1.8 to 15% by weight; carbide-forming elements Ti, Zr, Hf, Nb, Ta forming a content of from 0 to 3% by weight individually or in total; 0 to 4% by weight V; 0 to 6% by weight Co; 0 to 1.6% by weight Si; 0 to 2% by weight Mn; 0 to 2.99% by weight Ni; 0 to 1% by weight S; remainder: iron and inevitable impurities. The hot-work steel has a significantly higher thermal conductivity than known tool steels.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: October 15, 2013
    Assignee: Rovalma, S.A.
    Inventor: Isaac Valls Angles
  • Method for influencing the properties of cast iron
    Patent number: 8557176
    Abstract: A method is provided for influencing the properties of cast iron by adding magnesium to the cast iron melt and measuring the oxygen content of the cast iron melt. Magnesium is added to the cast iron melt until the oxygen content of the cast iron melt is approximately 0.005 to 0.2 ppm at a temperature of approximately 1,420° C. A sensor for measuring the oxygen content in cast iron melts contains an electrochemical measuring cell containing a solid electrolyte tube.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: October 15, 2013
    Assignee: Heraeus Electro-Nite International N.V.
    Inventor: Danny Habets
  • Method of cooling rail weld zone, and rail weld joint
    Patent number: 8557064
    Abstract: The invention provides a method of cooling a rail weld zone. The method includes a first rail web portion cooling process of cooling a rail web portion cooling region of the rail weld zone in a part of a temperature range until the completion of transformation from austenite to pearlite, a second rail web portion cooling process of cooling the rail web portion cooling region after the entire rail web portion of the rail weld zone is transformed to pearlite, a foot portion cooling process of cooling a foot portion of the rail weld zone, and a head portion cooling process of cooling a head portion of the rail weld zone. When cooling time of the first and second rail web portion cooling processes is t minute, a k value satisfies an expression represented as ?0.1t+0.63?k??0.1t+2.33.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: October 15, 2013
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Kenichi Karimine, Masaharu Ueda, Katsuya Iwano, Seiji Sugiyama
  • Stainless austenitic low Ni steel alloy
    Patent number: 8540933
    Abstract: An austenitic stainless steel alloy having the following composition in percent of weight (wt %): 0.02?C?0.06; Si<1.0; 2.0?Mn?6.0; 2.0?Ni?4.5; 17?Cr?19; 2.0?Cu?4.0; 0.15?N?0.25; 0?Mo?1.0; 0?W?0.3; 0?V?0.3; 0?Ti?0.5; 0?Al?1.0; 0?Nb?0.5; 0?Co?1.0; the balance Fe and normally occurring impurities, wherein the contents of the alloying elements are balanced so that the following conditions are fulfilled: Nieqv?1.42*Creqv??13.42; and Nieqv+0.85*Creqv?29.00 wherein Creqv=[% Cr]+2*[% Si]+1.5*[% Mo]+5*[% V]+5.5*[% Al]+1.75*[% Nb]+1.5*[% Ti]+0.75*[% W] Nieqv[% Ni]+[% Co]+0.5*[% Mn]+0.3*[% Cu]+25*[% N]+30*[% C]; and ?70° C.<MD30<?25° C., wherein MD30=(551?462*([% C]+[% N])?9.2*[% Si]?8.1*[% Mn]?13.7*[% Cr]?29*([% Ni]+[% Cu])?68*[% Nb]?18.5*[% Mo])° C.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: September 24, 2013
    Assignee: Sandvik Intellectual Property AB
    Inventors: Lars Nylöf, Anders Söderman
  • Ferritic spheroidal graphite cast iron
    Patent number: 8540932
    Abstract: Ferritic spheroidal graphite cast iron includes: 3.1 to 3.5 percent by mass of carbon; 4.1 to 4.5 percent by mass of silicon; 0.8 percent by mass or below of manganese; 0.1 to 0.6 percent by mass of molybdenum; 0.1 to 1.0 percent by mass of chromium; 0.03 to 0.1 percent by mass of phosphorus; 0.03 percent by mass or below of sulfur; 0.02 to 0.15 percent by mass of magnesium; and iron.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: September 24, 2013
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Takaoka Co., Ltd.
    Inventors: Yoshikazu Genma, Go Kuramoto, Yoshihiro Hibino, Zhong-zhi Zhang, Takeyuki Sakuma
  • Lead free free-cutting steel and its use
    Patent number: 8540934
    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: January 24, 2008
    Date of Patent: September 24, 2013
    Assignee: Sandvik Intellectual Property AB
    Inventors: Mattias Sandström, Ylva Trogen, Lars Karlsson
  • High-strength hot-rolled steel sheet and method for manufacturing the same
    Patent number: 8535458
    Abstract: A steel sheet contains, on a mass percent basis, 0.03%-0.12% C, 0.5% or less Si, 0.8%-1.8% Mn, 0.030% or less P, 0.01% or less S, 0.005%-0.1% Al, 0.01% or less N, 0.035%-0.100% Ti, and the balance being Fe and incidental impurities and has microstructures with a fraction of polygonal ferrite of 80% or more, the polygonal ferrite having an average grain size of 5 to 10 ?m. The amount of Ti present in a precipitate having a size of less than 20 nm is 70% or more of the value of Ti* calculated using expression (1): Ti*=[Ti]?48×[N]/14??(1) where [Ti] and [N] represent a Ti content (percent by mass) and a N content percent by mass), respectively, of the steel sheet.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: September 17, 2013
    Assignee: JFE Steel Corporation
    Inventors: Noriaki Kohsaka, Kazuhiro Seto, Reiko Sugihara, Masahide Watabe, Yasushi Tanaka
  • Steel material for hardening
    Patent number: 8535459
    Abstract: The present invention provides a steel material for hardening, including chemical components, by mass %, of: C: 0.15 to 0.60%; Si: 0.01 to 1.5%; Mn: 0.05 to 2.5%; P: 0.005 to 0.20%; S: 0.001 to 0.35%; Al: over 0.06 to 0.3%; and total N: 0.006 to 0.03%, with a balance including Fe and inevitable impurities including B of not more than 0.0004%, in which a hardness R at a position 5 mm away from a quenching end measured through a Jominy-type end-quenching method specified in JIS G 0561, and a calculation hardness H at a position 4.763 mm away from the quenching end satisfy the following Equation (1). H×0.948?R?H×1.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: September 17, 2013
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Kei Miyanishi, Manabu Kubota, Shuji Kozawa
  • Pitting corrosion resistant non-magnetic stainless steel
    Patent number: 8535606
    Abstract: Disclosed are corrosion resistant, non-magnetic austenitic stainless steels containing alloying elements molybdenum, nickel, and copper and further containing small quantities of an additional element selected from the group consisting of a rare-earth element, calcium, cobalt, iridium, osmium, rhenium, rhodium, ruthenium, silver, and a combination thereof.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: September 17, 2013
    Assignee: Baker Hughes Incorporated
    Inventor: Hendrik John
  • Method of making an austempered ductile iron article
    Patent number: 8524016
    Abstract: A method of making an austempered ductile iron article is disclosed. The method includes providing a melt of a ductile iron alloy composition. The method also includes casting the melt into a mold to form a casting. The method further includes cooling the casting to an austempering temperature by circulating a coolant through the mold; wherein cooling comprises solidifying the melt and forming a ductile iron article. Still further, the method includes heating the casting to maintain the austempering temperature for an interval sufficient to form an austempered ductile iron article that comprises a microstructure comprising ausferrite.
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: September 3, 2013
    Assignee: General Electric Company
    Inventors: Junyoung Park, Jason Robert Parolini
  • Bake-hardenable cold rolled steel sheet with superior strength, galvannealed steel sheet using the cold rolled steel and method for manufacturing the cold rolled steel sheet
    Patent number: 8518191
    Abstract: It is an object of the present invention to provide a high strength cold-rolled steel sheet, which has superior bake hardenability, aging resistance at room temperature and secondary work embrittlement resistance, and a method for manufacturing the same. The steel sheet has a grain size of ASTM No. of 9 or more after annealing, a BH of 30 MPa or more, an AI of 30 MPa or less, and a tensile strength of 340˜390 MPa through appropriate control of solute elements in steel by addition of a small amount of Ti, addition of Al and Mo, and control of manufacturing conditions, and refinement of crystal grains after annealing. The cold-rolled steel sheet and the galvannealed steel sheet produced using the cold-rolled steel sheet have the superior bake hardenability, aging resistance at room temperature, and secondary work embrittlement resistance.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: August 27, 2013
    Assignee: POSCO
    Inventor: Seong-Ho Han
  • Heat treatment for producing steel sheet with high strength and ductility
    Patent number: 8518195
    Abstract: The microstructure of a low alloy steel workpiece for cold forming may be beneficially modified by heating the workpiece to a temperature just above its austenite transformation temperature (Ac3 temperature). The steel workpiece is then cooled just below its Ac3 temperature to promote ferrite formation on and between the austenite grains. Heating and cooling, above and below the Ac3 temperature, is repeated a determined number of times to refine the austenite grains before the workpiece is quenched below its martensite transformation temperature to form a mixture of martensite with increased retained austenite. The workpiece may be further heated in its martensite region to increase the proportion of retained austenite before quenching the steel workpiece to an ambient temperature. The formability of the workpiece is improved, as is the strength of its formed shape.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: August 27, 2013
    Assignee: GM Global Technology Operations LLC
    Inventor: John R. Bradley