Tungsten Containing Patents (Class 420/114)
  • Patent number: 11186901
    Abstract: A steel constituting a chisel according to the present invention includes: 0.40-0.45% by mass of carbon, 0.50-0.80% by mass of silicon, 1.00-1.30% by mass of manganese, 0.001-0.005% by mass of sulfur, 2.90-3.80% by mass of chromium, and 0.20-0.40% by mass of molybdenum, with a balance consisting of iron and an unavoidable impurity, the steel has an ideal critical diameter DI defined by Equation (1) of 600 or more: DI=7·(% C)1/2·(1+0.64·% Si)·(1+4.1·% Mn)·(1+2.83·% P)·(1?0.62·% S)·(1+2.33·% Cr)·(1+3.14·% Mo)??(1).
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: November 30, 2021
    Assignee: KOMATSU LTD.
    Inventors: Eiji Amada, Akihiro Ochiai, Norimasa Tsunekage, Yuko Nagaki
  • Patent number: 10465269
    Abstract: Disclosed herein are embodiments of alloys which can be used for hardfacing applications, and hardfacing layers themselves. In particular, embodiments of the alloys can have high hardness as well as impact resistance. These advantageous properties can occur due to the inclusion of hardfacing particles, as well as other compositional, microstructural, thermodynamic, and performance criteria.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: November 5, 2019
    Assignee: Scoperta, Inc.
    Inventors: Justin Lee Cheney, Adolfo Castells, Jonathon Bracci
  • Patent number: 9212411
    Abstract: A high-strength steel sheet includes a composition containing, in mass percent, 0.08% to 0.20% of carbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese, 0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05% or less of aluminum, 0.07% to 0.20% of titanium, and 0.20% to 0.80% of vanadium, the balance being iron and incidental impurities.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: December 15, 2015
    Assignee: JFE Steel Corporation
    Inventors: Koichi Nakagawa, Takeshi Yokota, Kazuhiro Seto, Satoshi Kinoshiro, Yuji Tanaka, Katsumi Yamada, Tetsuya Mega, Katsumi Nakajima
  • Patent number: 9068238
    Abstract: Described is a high tensile strength hot rolled steel sheet having high strength and formability, and a manufacturing method. It has tensile strength ?980 MPa and excellent formability, and specifically identified ranges by mass % of C, Si, Mn, P, S, N, Al, Ti, V, Solute V, and Solute Ti; (ii) microstructure with fine carbides dispersion precipitated therein, the fine carbides containing Ti and V and having the average particle diameter <10 nm, as well as volume ratio with respect to the entire microstructure ?0.007; and matrix as ferrite phase having area ratio with respect to the entire microstructure ?97%. C, Ti, V, S and N satisfy (1) Ti?0.08 +(N/14×48+S/32×48) and (2) 0.8?(Ti/48+V/51)/(C/12)?1.2, where “C”, “Ti”, “V”, “S” and “N” represent contents (mass %) of corresponding elements, respectively.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: June 30, 2015
    Assignee: JFE STEEL CORPORATION
    Inventors: Tamako Ariga, Katsumi Nakajima, Tetsuya Mega
  • Patent number: 9005520
    Abstract: The invention concerns steels having excellent resistance over time, in a corrosive atmosphere due to oxidizing environments such as, for example, fumes or water vapor, under high pressure and/or temperature. The invention concerns a steel composition for special applications, said composition containing, by weight, about 1.8 to 11% of chromium (and preferably between about 2.3 and 10% of chromium), less than 1% of silicon, and between 0.20 and 0.45% of manganese. It has been found that it is possible to adjust the contents of the composition based on a predetermined model, selected to obtain substantially optimal properties with respect to corrosion in specific conditions of high temperature performances. Said model can involve as additive of as residue at least one element selected among molybdenum, tungsten, cobalt, and nickel.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: April 14, 2015
    Assignees: V & M France
    Inventors: Jean Leyer, Bruno Vandenberghe, Viviane Lepingle, Ghislain Louis, Annie Fouquet, Catheline Petelot, Emilie Petelot, Adeline Petelot
  • Publication number: 20150044086
    Abstract: A steel wire rod or steel bar as hot-rolled, including: by mass %: C: 0.1 to 0.6%, Si: 0.01 to 1.5%, Mn: 0.05 to 2.5%, Al: 0.015 to 0.3%, and N: 0.0040 to 0.0150%, and P: limited to 0.035% or less and S: limited to 0.025% or less, and the balance substantially consisting of iron and unavoidable impurities, wherein a depth of d (mm) from the surface of the surface layer region with 20 HV 0.2 or more higher, relative to HV 0.2 that is the average hardness in the region where the depth from the surface is from sectional radius R×0.5 (mm) to the center satisfies the formula (1); the steel structure of the surface layer region has a ferrite fraction of 10% or less by area ratio, with the balance being one or two or more of martensite, bainite and pearlite; the steel structure where the depth from the surface is from the sectional radius R×0.
    Type: Application
    Filed: April 1, 2013
    Publication date: February 12, 2015
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kei Miyanishi, Atsushi Monden, Shingo Yamasaki, Shunta Homma
  • Patent number: 8865061
    Abstract: The invention relates to a steel alloy for a low alloy steel for producing high-tensile, weldable, hot-rolled seamless steel tubing, in particular construction tubing. The chemical composition (in % by mass) is: 0.15-0.18% C; 0.20-0.40% Si; 1.40-1.60% Mn; max. 0.05% P; max. 0.01% S; >0.50-0.90% Cr; >0.50-0.80% Mo; >0.10-0.15% V; 0.60-1.00% W; 0.0130-0.0220% N; the remainder is made up of iron with production-related impurities; with the optional addition of one or more elements selected from Al, Ni, Nb, Ti, with the proviso that the relationship V/N has a value of between 4 and 12 and the Ni content of the steel is not more than 0.40%.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: October 21, 2014
    Assignee: Vallourec Deutschland GmbH
    Inventors: Christoph Kaucke, Guido Kubla, Heinz Sanders, Charles Stallybrass, André Schneider, Markus Schütz
  • Patent number: 8801872
    Abstract: A case hardened gear steel having enhanced core fracture toughness includes by weight percent about 16.3Co, 7.5Ni, 3.5Cr, 1.75Mo, 0.2W, 0.11C, 0.03Ti, and 0.02V and the balance Fe, characterized as a predominantly lath martensitic microstructure essentially free of topologically close-packed (TCP) phases and carburized to include fine M2C carbides to provide a case hardness of at least about 62 HRC and a core toughness of at least about 50 ksi?in.
    Type: Grant
    Filed: August 20, 2008
    Date of Patent: August 12, 2014
    Assignee: QuesTek Innovations, LLC
    Inventors: James A. Wright, Jason Sebastian
  • Patent number: 8709336
    Abstract: The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.35%?C?0.8%, 0%?Si?2%, 0%?Al?2%, 0.35%?Si+Al?2%, 0%?Mn?2.5%, 0%?Ni?5%, 0%?Cr?5%, 0%?Mo?0.50%, 0%?W?1.00%, 0.1%?Mo+W/2?0.50%, 0%?B?0.02%, 0%?Ti?2%, 0%?Zr?4%, 0.05%?Ti+Zr/2?2%, 0%?S?0.15%, N<0.03%; optionally from 0% to 1.5% of Cu; optionally Nb, Ta or V with Nb/2+Ta/4+V?0.5%; optionally less than 0.1% of Se, Te, Ca, Bi or Pb; the rest being iron and impurities; the composition satisfying: 0.1%?C*=C?Ti/4?Zr/8+7×N/8?0.55% and 1.05×Mn+0.54×Ni+0.50×Cr+0.3×(Mo+W/2)1/2+K>1.8, with K=0.5 if B?0.0005% and K=0 if B<0.0005% and Ti+Zr/2?7×N/2?0.05%; hardening after austenitization while cooling at a speed>0.5° C./s between a temperature>AC3 and ranging between T=800?270×C*?90×Mn?37×Ni?70×Cr?83×(Mo+W/2) and T?50° C.; then at a core speed Vr<115×ep?1.7 between T and 100° C., (ep=plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate.
    Type: Grant
    Filed: June 17, 2008
    Date of Patent: April 29, 2014
    Assignee: Industeel Creusot
    Inventors: Jean Beguinot, Jean-Georges Brisson
  • Publication number: 20140065316
    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 <20 ?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: Application
    Filed: August 22, 2013
    Publication date: March 6, 2014
    Applicant: Scoperta, Inc.
    Inventors: Justin Lee Cheney, John Hamilton Madok
  • Patent number: 8647449
    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 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 families of alloys capable of forming crack-free weld overlays after multiple welding passes.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: February 11, 2014
    Assignee: Scoperta, Inc.
    Inventors: Justin Lee Cheney, John Hamilton Madok
  • 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
  • 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
  • Publication number: 20130266820
    Abstract: A work piece for use in abrasive environments with hardbanding is provided. The work piece has at least a protective layer deposited onto at least a portion to be protected. The deposited layer exhibits a hardness of at least 50 Rc, a wear rate of less than 0.5 grams of mass loss as measured according to ASTM G65-04, Procedure A, a wear rate on a contacting secondary body comprising carbon steel of less than 0.005 grams as measured according to modified ASTM G77 wear test. The deposited alloy forms an iron matrix comprising embedded hard particles in an amount of less than 15 vol. %. The embedded hard particles have an average particle size of ranging from 100 nm to 5 ?m. In one embodiment, the deposition is via welding.
    Type: Application
    Filed: April 5, 2012
    Publication date: October 10, 2013
    Applicant: c/o Chevron Corporation
    Inventors: Grzegorz Jan Kusinski, Justin Lee Cheney, John Hamilton Madok
  • Publication number: 20130017117
    Abstract: A bearing steel contains C: 0.56% by mass or more and 0.70% by mass or less, Si: 0.15% by mass or more and less than 0.50% by mass, Mn: 0.60% by mass or more and 1.50% by mass or less, Cr: 0.50% by mass or more and 1.10% by mass or less, P: 0.025% by mass or less, S: 0.025% by mass or less, Al: 0.005% by mass or more and 0.500% by mass or less, O: 0.0015% by mass or less, N: 0.0030% by mass or more and 0.015% by mass or less, and a remainder of Fe and incidental impurities. The bearing steel has a composition such that the eutectic carbide formation index Ec satisfies 0<Ec?0.25.
    Type: Application
    Filed: November 30, 2010
    Publication date: January 17, 2013
    Applicant: JFE Steel Corporation
    Inventors: Minoru Honjo, Kazukuni Hase, Hideto Kimura
  • Publication number: 20120321503
    Abstract: An ingot steel for bearings has a composition containing C: 0.56% by mass or more and 0.70% by mass or less, Si: 0.15% by mass or more and less than 0.50% by mass, Mn: 0.60% by mass or more and 1.50% by mass or less, Cr: 0.50% by mass or more and 1.10% by mass or less, P: 0.025% by mass or less, S: 0.025% by mass or less, Al: 0.005% by mass or more and 0.500% by mass or less, O: 0.0015% by mass or less, N: 0.0030% by mass or more and 0.015% by mass or less, and a remainder of Fe and incidental impurities, wherein eutectic carbide formation index Ec satisfies 0<Ec?0.25.
    Type: Application
    Filed: November 30, 2010
    Publication date: December 20, 2012
    Inventors: Minoru Honjo, Kazukuni Hase, Hideto Kimura
  • Publication number: 20120224992
    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 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 families of alloys capable of forming crack-free weld overlays after multiple welding passes.
    Type: Application
    Filed: March 6, 2012
    Publication date: September 6, 2012
    Inventors: JUSTIN LEE CHENEY, John Hamilton Madok
  • Publication number: 20120014831
    Abstract: The present invention provides a wire rod with a composition at least including: C: 0.95-1.30 mass %; Si: 0.1-1.5 mass %; Mn: 0.1-1.0 mass %; Al: 0-0.1 mass %; Ti: 0-0.1 mass %; P: 0-0.02 mass %; S: 0-0.02 mass %; N: 10-50 ppm; O: 10-40 ppm; and a balance including Fe and inevitable impurities, wherein 97% or more of an area in a cross-section perpendicular to the longitudinal direction of the wire rod is occupied by a pearlite, and 0.5% or less of an area in a central area in the cross-section and 0.5% or less of an area in a first surface layer area in the cross-section are occupied by a pro-eutectoid cementite.
    Type: Application
    Filed: October 19, 2010
    Publication date: January 19, 2012
    Inventors: Shingo Yamasaki, Toshiyuki Manabe, Daisuke Hirakami, Nariyasu Muroga
  • Publication number: 20110274578
    Abstract: The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300° C. of 650 or more.
    Type: Application
    Filed: January 15, 2010
    Publication date: November 10, 2011
    Inventors: Atsushi Mizuno, Masayuki Hashimura, Kei Miyanishi, Shuji Kozawa
  • Publication number: 20110129381
    Abstract: The present invention provides a high-tensile steel material having a tensile strength of the 550 MPa class or more which can simultaneously raise the strength and toughness of the heat affected zone of weld to equal those of the matrix and a method of production of the same, that is, a high-tensile steel material with excellent weldability and toughness and with tensile strength of the 550 MPa class or more containing, by mass %, C: 0.005 to 0.10%, W: 0.10 to 3.0%, Nb: 0.010 to 0.080%, and V: 0.010 to 0.50%, limiting the Ti to less than 0.005%, satisfying equation; EC=2[C]?[Nb]/9?[V]/12>0.020, having an amount of precipitation of W contained in the steel material, in terms of analytical value obtained by quantitative analysis of potential electrolysis extraction residue by fluorescent X-ray analysis, of 0.0050% or less, and having 60% or more of its structural composition in a cross-section of the steel as a bainite structure.
    Type: Application
    Filed: May 2, 2005
    Publication date: June 2, 2011
    Applicant: NIPON STEEL CORPORATION
    Inventors: Yasushi Hasegawa, Naoki Saitoh, Youichi Tanaka
  • Publication number: 20110121056
    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: Application
    Filed: November 3, 2010
    Publication date: May 26, 2011
    Inventors: Justin Lee Cheney, John Hamilton Madok
  • Publication number: 20110068152
    Abstract: Disclosed herein are iron-based alloys having a structure comprising fine-grained ferritic matrix and having a 60+ Rockwell C surface, wherein the ferrific 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: Application
    Filed: September 17, 2010
    Publication date: March 24, 2011
    Inventors: Justin Lee Cheney, John Hamilton Madok
  • Publication number: 20110008647
    Abstract: This cold-rolled steel sheet includes, in terms of mass %, C: not less than 0.05% and not more than 0.095%, Cr: not less than 0.15% and not more than 2.0%, B: not less than 0.0003% and not more than 0.01%, Si: not less than 0.3% and not more than 2.0%, Mn: not less than 1.7% and not more than 2.6%, Ti: not less than 0.005% and not more than 0.14%, P: not more than 0.03%, S: not more than 0.01%, Al: not more than 0.1%, N: less than 0.005%, O: not less than 0.0005% and not more than 0.005%, and contains as the remainder, iron and unavoidable impurities, wherein the microstructure of the steel sheet includes mainly polygonal ferrite having a crystal grain size of not more than 4 ?m, and hard microstructures of bainite and martensite, the block size of the martensite is not more than 0.9 ?m, the Cr content within the martensite is 1.1 to 1.5 times the Cr content within the polygonal ferrite, and the tensile strength is at least 880 MPa.
    Type: Application
    Filed: March 26, 2009
    Publication date: January 13, 2011
    Inventors: Masafumi Azuma, Naoki Yoshinaga, Naoki Maruyama, Noriyuki Suzuki, Yasuharu Sakuma
  • Patent number: 7820098
    Abstract: In the thermal power system, the electricity production efficiency may be improved by providing turbine members having the improved high temperature characteristic over the corresponding prior art turbine members. Turbine members may be provided by using high resistant steels composed of any one or ones selected from the group consisting of the components, including 0.08 to 0.13% of carbon (C), 8.5 to 9.8% of chromium (Cr), 0 to 1.5% of molybdenum (Mo), 0.10 to 0.25% of vanadium (V), 0.03 to 0.08% of niobium (Nb), 0.2 to 5.0% of tungsten (W), 1.5 to 6.0% of cobalt (Co), 0.002 to 0.015% of boron (B), 0.015 to 0.025% of nitrogen (N), and optionally, 0.01 to 3.0% of rhenium (Re), 0.1 to 0.50% of silicon (Si), 0.1 to 1.0% of manganese (Mo), 0.05 to 0.8% of nickel (Ni) and 0.1 to 1.3% of cupper.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: October 26, 2010
    Assignees: The Japan Steel Works, Ltd., The Kansai Electric Power Co., Inc.
    Inventors: Masahiko Morinaga, Yoshinori Murata, Tsukasa Azuma, Kazuhiro Miki, Tohru Ishiguro, Ryokichi Hashizume
  • Publication number: 20100196189
    Abstract: A high-strength steel sheet has high stretch flangeability after working and corrosion resistance after painting. The steel sheet contains, on the basis of mass percent, C: 0.02% to 0.20%, Si: 0.3% or less, Mn: 0.5% to 2.5%, P: 0.06% or less, S: 0.01% or less, Al: 0.1% or less, Ti: 0.05% to 0.25%, and V: 0.05% to 0.25%, the remainder being Fe and incidental impurities. The steel sheet has a substantially ferritic single phase, the ferritic single phase containing precipitates having a size of less than 20 nm, the precipitates containing 200 to 1750 mass ppm Ti and 150 to 1750 mass ppm V, V dissolved in solid solution being 200 or more but less than 1750 mass ppm.
    Type: Application
    Filed: July 31, 2008
    Publication date: August 5, 2010
    Applicant: JFE STEEL CORPORATION
    Inventors: Koichi Nakagawa, Takeshi Yokota, Nobuyuki Nakamura, Kazuhiro Seto, Satoshi Kinoshiro, Katsumi Yamada
  • Publication number: 20100047617
    Abstract: Steel sheet having a composition of ingredients containing substantially, by mass %, C: 0.005 to 0.200%, Si: 2.50% or less, Mn: 0.10 to 3.00%, N: 0.0100% or less, Nb: 0.005 to 0.100%, and Ti: 0.002 to 0.150% and satisfying the relationship of Ti-48/14×N?0.0005, having a sum of the X-ray random intensity ratios of the {100}<001> orientation and the {110}<001> orientation of a ? sheet thickness part of 5 or less, having a sum of the maximum value of the X-ray random intensity ratios of the {110}<111> to {110}<112> orientation group and the X-ray random intensity ratios of the {211}<111> orientation of 5 or more, and having a high rolling direction Young's modulus measured by the static tension method and a method of production of the same are provided.
    Type: Application
    Filed: November 7, 2007
    Publication date: February 25, 2010
    Inventors: Natsuko Sugiura, Naoki Maruyama, Manabu Takahashi, Yohji Nakamura, Koji Hanya
  • Publication number: 20100028196
    Abstract: The present invention provides a high strength heat treated steel wire for spring having a tensile strength of 2000 MPa or more which is coiled in the cold state and can achieve both sufficient atmospheric strength and coilability and spring steel used for that steel wire, that is, a high strength heat treated steel wire for a spring characterized by comprising, by mass %, C: 0.5 to 0.9%, Si: 1.0 to 3.0%, Mn: 0.1 to 1.5%, Cr: 1.0 to 2.5%, V: over 0.15 to 1.0%, and Al: 0.005% or less, controlling N to 0.007% or less, further containing one or two of Nb: 0.001 to less than 0.01% and Ti: 0.001 to less 0.005%, and having a tensile strength of 2000 MPa or more, having cementite-based spheroidal carbides and alloy-based spheroidal carbides in a microscopic visual field satisfying an area percentage of carbides with a circle equivalent diameter of 0.
    Type: Application
    Filed: November 9, 2006
    Publication date: February 4, 2010
    Inventors: Masayuki Hashimura, Hiroshi Hagiwara, Takayuki Kisu, Kouichi Yamazaki, Tatsuroi Ochi, Takashi Fujita
  • Publication number: 20090274572
    Abstract: The invention provides a high-strength pearlitic steel rail, which is inexpensive, and has a tensile strength of 1200 MPa or more, and is excellent in delayed fracture properties. Specifically, the rail contains, in mass percent, C of 0.6 to 1.0%, Si of 0.1 to 1.5%, Mn of 0.4 to 2.0%, P of 0.035% or less, S of 0.0005 to 0.010%, and the remainder is Fe and inevitable impurities, wherein tensile strength is 1200 MPa or more, and size of a long side of an A type inclusion is 250 mm or less in at least a cross-section in a longitudinal direction of a rail head, and the number of A type inclusions, each having a size of a long side of 1 mm to 250 mm, is less than 25 per observed area of 1 mm2 in the cross-section in the longitudinal direction of the rail head.
    Type: Application
    Filed: March 16, 2007
    Publication date: November 5, 2009
    Applicant: JFE Steel Corporation
    Inventors: Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Nobuo Shikanai
  • Publication number: 20090238713
    Abstract: The invention relates to an ultrahigh-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, 0.15% or less of P, 0.02% or less of S, 1.5% or less of Al, 0.003 to 2.0% of Cr, and a balance including iron and inevitable impurities; in which grains of residual austenite have an average axis ratio (major axis/minor axis) of 5 or more, the grains of the residual austenite have an average minor axis length of 1 ?m or less, and the grains of the residual austenite have a nearest-neighbor distance between the grains of 1 ?m or less.
    Type: Application
    Filed: December 28, 2006
    Publication date: September 24, 2009
    Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Shinshu TLO Co., Ltd.
    Inventors: Junichiro Kinugasa, Fumio Yuse, Yoichi Mukai, Shinji Kozuma, Hiroshi Akamizu, Kouji Kasuya, Muneaki Ikeda, Koichi Sugimoto
  • Patent number: 7575646
    Abstract: The present invention provides a steel wire, for springs excellent in coiling property while having a high strength, as a heat treated steel wire for high strength springs, characterized by: comprising, in mass, C: 0.75 to 0.85%, Si: 1.5 to 2.5%, Mn: 0.5 to 1.0%, Cr: 0.3 to 1.0%, P: not more than 0.015%, S: not more than 0.015%, N: 0.001 to 0.007%, W: 0.05 to 0.3%, and the balance consisting of Fe and unavoidable impurities; having a tensile strength of not less than 2,000 MPa; spheroidal carbides, composed of mainly cementite, observed in a microscopic visual field satisfying the area percentage of the spheroidal carbides not less than 0.2 ?m in circle equivalent diameter being not more than 7%, the density of the spheroidal carbides 0.2 to 3 ?m in circle equivalent diameter being not more than 1 piece/?m2, and the density of the spheroidal carbides over 3 ?m in circle equivalent diameter being not more than 0.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: August 18, 2009
    Assignee: Nippon Steel Corporation
    Inventors: Masayuki Hashimura, Takanari Miyaki, Hiroshi Hagiwara, Hiroaki Hayashi, Shouich Suzuki, Katsuaki Shiiki, Noriyuki Yamada, Seiichi Koike
  • Patent number: 7537727
    Abstract: The present invention relates to a low alloy, low to medium carbon content, high strength, and high ductility steel composition. The present invention contains relatively low nickel content, yet exhibits high performance characteristics and is manufactured at a substantially lower cost than alloy compositions containing high levels of nickel.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: May 26, 2009
    Assignee: Ellwood National Forge Company
    Inventors: Morris Dilmore, James D. Ruhlman
  • Publication number: 20090092516
    Abstract: The present invention provides spring use heat treated steel which is cold coiled, can achieve both sufficient atmospheric strength and coilability, has a tensile strength of 2000 MPa or more, and can improve the performance as a spring by heat treatment after spring fabrication, that is, high strength spring-use heat treated steel characterized by containing, by mass %, C: 0.45 to 0.9%, Si: 1.7 to 3.0%, and Mn: 0.1 to 2.0%, restricting N: to 0.007% or less, having a balance of Fe and unavoidable impurities, and satisfying, in terms of the analyzed value of the extracted residue after heat treatment, [amount of Fe in residue on 0.2 ?m filter/[steel electrolysis amount]×100?1.1.
    Type: Application
    Filed: March 29, 2007
    Publication date: April 9, 2009
    Inventors: Masayuki Hashimura, Tatsuro Ochi, Takayuki Kisu, Hiroshi Hagiwara
  • Patent number: 7494618
    Abstract: To provide an alloy tool steel having high-temperature strength at an operating temperature of the order of 700° C., while maintaining room-temperature strength as high as that of a conventional matrix high-speed tool steel. The steel contains from 0.45 wt % to 0.65 wt % C, from 0.10 wt % to 1.00 wt % Si, from 0.20 wt % to 2.00 wt % Mn, not more than 0.020 wt % P, not more than 0.015 wt % S, not more than 1.00 wt % Cu, not more than 1.00 wt % Ni, from 3.50 wt % to 5.00 wt % Cr, from 0.00 wt % to 3.00 wt % Mo, from 0.00 wt % to 10.00 wt % W, from 1.00 wt % to 2.00 wt % V, from 0.00 wt % to 8.00 wt % Co, not more than 0.10 wt % Al, not more than 0.01 wt % O, not more than 0.02 wt % N, and the balance substantially constituted of Fe and unavoidable impurities, in which Weq is from 2.0 to 10.0, 2Mo/Weq is not more than 0.60, and ?C is from ?0.3 to 0.0.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: February 24, 2009
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventor: Kozo Ozaki
  • Patent number: 7074286
    Abstract: A high-strength, high-toughness steel alloy includes, generally, about 2.5% to about 4% chromium, about 1.5% to about 3.5% tungsten, about 0.1% to about 0.5% vanadium, and about 0.05% to 0.25% carbon with the balance iron, wherein the percentages are by total weight of the composition, wherein the alloy is heated to an austenitizing temperature and then cooled to produce an austenite transformation product.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: July 11, 2006
    Assignee: UT-Battelle, LLC
    Inventors: Ronald L. Klueh, Philip J. Maziasz, Vinod Kumar Sikka, Michael L. Santella, Sudarsanam Suresh Babu, Maan H. Jawad
  • Patent number: 6942741
    Abstract: An iron alloy strip having a gage of 0.1 to 5 mm and a magnetic field strength variation within the strip of 0 to 10 Hz, made of an iron alloy consisting essentially of, in % by weight, 0.0001-0.02% of C, 0.0001-5% of Si, 0.001-0.2% of Mn, 0.0001-0.05% of P, 0.0001-0.05% of S, 0.0001-5% of Al, 0.001-0.1% of O, 0.0001-0.03% of N, 0-10% of Co, 0-10% of Cr, 0.01-5% in total of Ti, Zr, Nb, Mo, V, Ni, W, Ta and/or B, and the balance of Fe, and having a saturation magnetic flux density of 1.7-2.3 Tesla, a maximum relative permeability of 1,200-22,000 and a coercive force of 20-380 A/m is suited for use as yokes in voice coil motor magnetic circuits. The iron alloy strip is highly resistant to corrosion and eliminates a need for a corrosion resistant coating.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: September 13, 2005
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Masanobu Shimao, Masaaki Nishino, Takehisa Minowa
  • Patent number: 6841122
    Abstract: A hot working die steel contains 0.05-0.25% C, 0.30% or less Si, 0.03% or less Mn, 1.0% or less Ni, 5.0-13.0 % Cr, 2.0% or less Mo, 1.0-8.0% W, 1.0-10.0% Co, 0.003-0.020% B, 0.005-0.050% N, and the balance consisting essentially of Fe and unavoidable impurities. If desired, the hot working die steel may further contain 0.01-1.0% V and 0.01-1.0% of at least one kind selected from Nb and Ta.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: January 11, 2005
    Assignee: The Japan Steel Works, Ltd.
    Inventors: Rinzo Kayano, Eiji Maeda
  • Patent number: 6821360
    Abstract: A heat-resisting steel comprising 0.15-0.30 wt. % C, 0.05-0.3 wt. % Si, 0.01-0.7 wt. % Mn, 1.8-2.5 wt. % Cr, 0.15-0.23 wt. % V, 1.5-2.5 wt. % W, 0.01-0.02 wt. % Ti, 0.01-0.08 wt. % Nb, 0.005-0.03 wt. % N, 0.001-0.015 wt. % B, and Fe and unavoidable impurities as the remainder; a heat-resisting steel comprising 0.15-0.30 wt. % C, 0.05-0.3 wt. % Si, 0.01-0.7 wt. % Mn, 1.8-2.5 wt. % Cr, 0.15-0.23 wt. % V, 1.5-2.5 wt. % W, 0.3-0.8 wt. % Mo, 0.01-0.02 wt. % Ti, 0.01-0.08 wt. % Nb, 0.005-0.03 wt. % N, 0.001-0.015 wt. % B, and Fe and unavoidable impurities as the remainder; and a heat-resisting steel that is obtained by subjecting one of the above heat-resisting steels to a heat treatment comprising the step of oil-cooling the heat-resisting steel to a temperature of 300° C. or lower. These heat-resisting steels are excellent in both high-temperature strength and impact properties.
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: November 23, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ryuichi Ishii, Yoichi Tsuda, Masayuki Yamada
  • Publication number: 20040118490
    Abstract: A high-strength, high-toughness steel alloy includes, generally, about 2.5% to about 4% chromium, about 1.5% to about 3.5% tungsten, about 0.1% to about 0.5% vanadium, and about 0.05% to 0.25% carbon with the balance iron, wherein the percentages are by total weight of the composition, wherein the alloy is heated to an austenitizing temperature and then cooled to produce an austenite transformation product.
    Type: Application
    Filed: December 18, 2002
    Publication date: June 24, 2004
    Inventors: Ronald L. Klueh, Philip J. Maziasz, Vinod Kumar Sikka, Michael L. Santella, Sudarsanam Suresh Babu, Maan H. Jawad
  • Patent number: 6482354
    Abstract: A tool steel alloy having a unique combination of hardness and toughness is disclosed. The alloy contains, in weight percent, about: wt. % C 1.85-2.30, Mn 0.15-1.0, Si 0.15-1.0, P 0.030 max., S 0-0.30, Cr 3.7-5.0, Ni+Cu 0.75 max., Mo 1.0 max., Co 6-12, W 12.0-13.5, V 4.5-7.5. The balance is essentially iron and usual impurities. The elements C, Cr, Mo, W, and V are balanced in this alloy such that −0.05≦&Dgr;C≦−0.42 where &Dgr;C=((0.033W)+(0.063Mo)+(0.06Cr)+(0.2V))−C. A powder metallurgy tool steel article made from consolidated alloy powder having the aforesaid weight percent composition provides a Rockwell C hardness of at least about 69.5 when heat treated.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: November 19, 2002
    Assignee: CRS Holdings, Inc.
    Inventors: David E. Wert, Gregory J. Del Corso, Harrison A. Garner, Jr.
  • Patent number: 6096262
    Abstract: A martensitic heat resisting steel having improved heat resistance, which consists by weight percentage of 0.35%.ltoreq.C.ltoreq.0.60%, 1.0%.ltoreq.Si.ltoreq.2.5%, 0.1%.ltoreq.Mn<1.5%, 7.5%.ltoreq.Cr.ltoreq.13.0%, one or both of 1.0%.ltoreq.Mo.ltoreq.3.0% and 1.0%.ltoreq.W.ltoreq.3.0% so that 1.5%.ltoreq.(Mo+0.5W).ltoreq.3.0%, optionally 0.1%.ltoreq.Nb+Ta.ltoreq.1.0%, 0.1%.ltoreq.V.ltoreq.1.0% and S.ltoreq.0.1%, and the remainder is substantially Fe.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: August 1, 2000
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Shigeki Ueta, Toshiharu Noda, Michio Okabe
  • Patent number: 6057045
    Abstract: A powder-metallurgy produced high-speed steel article having a combination of high hardness and wear resistance, particularly at elevated temperatures. This combination of properties is achieved by the combination of W, Mo, V, and Co. The article is particularly suitable for use in the manufacture of gear cutting tools, such as hobs, and surface coatings.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: May 2, 2000
    Assignee: Crucible Materials Corporation
    Inventors: Andrzej L. Wojcieszynski, William Stasko
  • Patent number: 5830287
    Abstract: A hot-worked, fully dense, wear resistant, vanadium-rich, powder metallurgy cold work tool steel article having improved impact toughness. This is achieved by controlling the amount, composition and size of the primary carbides and by insuring that substantially all the primary carbides remaining after hardening and tempering are MC-type vanadium-rich carbides. The article is produced by hot isostatic compacting of nitrogen atomized powder particles.
    Type: Grant
    Filed: April 9, 1997
    Date of Patent: November 3, 1998
    Assignee: Crucible Materials Corporation
    Inventors: Kenneth E. Pinnow, William Stasko
  • Patent number: 5817191
    Abstract: An iron-based, cobalt-containing soft magnetic alloy suitable for use as a core in a magnetic switch or other exciting circuits has a cobalt content of 6 through 30 weight percent, at least one of the elements chromium, molybdenum, vanadium and tungsten in range of 3 through 8 weight percent, and a remainder iron, possibly including inconsequential contaminants. The alloy has a coercive field strength of lower than or equal to 3.2 A/cm, and a saturation flux density of greater than 1.9 Tesla.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: October 6, 1998
    Assignee: Vacuumschmelze GmbH
    Inventors: Kurt Emmerich, Hartwin Weber, Hermann Wegerle
  • Patent number: 5753005
    Abstract: A source powder for a wear-resistant sintered material, consisting essentially of, in weight percentages, Cr: 3.0 to 6.0%, 2 Mo+W: 10.0 to 20.0%, V: 1.0 to 8.0%, Co: 10.0% or below, C: 0.20% to {0.01(2 Mo+W)+0.24 V}%, Si: 0.1 to 1.0%, Mn: 0.1 to 1.0% and the balance being Fe and unavoidable impurities, or one prepared by adding 0.10 to 0.8% of S to the above composition. This powder can be compacted into a green compact having a high green density, which can further give a wear-resistant sintered material having a high sintered density, hardness and strength.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: May 19, 1998
    Assignees: Hitachi Powdered Metals Co., Ltd., Mitsubishi Steel Mfg. Co., Ltd.
    Inventors: Yoshimasa Aoki, Kei Ishii, Yukio Tokuyama, Yuji Soda
  • Patent number: 5746843
    Abstract: A low Mn-low Cr ferritic heat resistant steel consisting essentially of, in weight %: 0.02-0.20% C, up to 0.7% Si, less than 0.1% Mn, up to 0.8% Ni, 0.8-3.5% Cr, 0.01-3.0% W, 0.1-0.5% V, 0.01-0.20% Nb, 0.001-0.05% Al, 0.0005-0.05% Mg, 0.0005-0.01% B, less than 0.05% N, up to 0.03% P, up to 0.015% S, 0.001-0.05% Ti and the balance Fe and incidental impurities, wherein the B content is defined so as to satisfy the following formula (14/11)B>N-N(V/51)/{(C/12)+(N/14)}-N(Nb/93)/{(C/12)+(N/14)}-N(Ti/48)/{C/12 )+(N/14)}. The steel can further contain optionally 0.01-1.5% Mo, and/or one or more elements selected from the group consisting of 0.01-0.2% La, 0.01-0.2% Ce, 0.01-0.2% Y, 0.01-0.2% Ca, 0.01-0.2% Ta and 0.01-0.2% Zr. The steel can be used in place of the austenitic steels or high Cr ferritic steels, since it has remarkably improved toughness, workability and weldability, and excellent creep properties at elevated temperatures.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: May 5, 1998
    Assignees: Sumitomo Metal Industries, Ltd., Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Kaori Miyata, Masaaki Igarashi, Fujimitsu Masuyama, Nobuyoshi Komai, Tomomitsu Yokoyama
  • Patent number: 5201965
    Abstract: A heat-resistant cast steel having a metal matrix substantially consisting of a ferrite phase and a pearlitic-colony phase has a composition consisting essentially, by weight, of C: 0.05-0.25%, Si:2.5-3.5%, Mn:2% or less, Cr:4-8%, N:0.05% or less, and Fe and inevitable impurities: balance, as well as at least one selected from the group consisting of (i) W and/or Co:0.1-2%, (ii) a rare earth element and/or Y:0.1% or less, (iii) Mg and/or Ca:0.005-0.03%, and (iv) B:0.001-0.01%.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: April 13, 1993
    Assignee: Hitachi Metals, Ltd.
    Inventors: Koki Ohtsuka, Norio Takahashi
  • Patent number: 5032356
    Abstract: A high fatigue strength metal band saw backing material of the present invention comprises 0.27 to 0.40% of C, not more than 0.35% of Si, 0.3 to 1.2% of Mn, 0.45 to 0.75% of Ni, more than 3.0% to 4.5% of Cr, 1.5 to 2.3% of one or two of Mo and W in terms of "Mo+W/2", 0.03 to 0.2% of one or two of V and Nb in terms of "V+Nb/2", in terms of percent by weight, the balance Fe and inevitable impurities. The metal band saw can maintain its high fatigue strength even if it is subjected to heat treatment under the same conditions as those for high speed steel used as an edge material and thus exhibits excellent properties as a metal band saw backing material.
    Type: Grant
    Filed: April 17, 1990
    Date of Patent: July 16, 1991
    Assignee: Hitachi Metals, Ltd.
    Inventors: Atushi Kumagai, Toshio Okuno, Yoshihiro Minagi, Katuaki Fukushima
  • Patent number: 4729872
    Abstract: Isotropic tool steel consisting essentially of necessary elements as tool steel, less than 0.005 weight % of S and less than 30 ppm of O, the balance being substantially Fe. The necessary elements are, by weight, 0.10-0.70% of C, 2.00% or less of Si, 2.00% or less of Mn, 7.00% or less of Cr, 0.20-12.00% of W and/or Mo alone or in combination (1/2W+Mo), 3.00% or less of V. They may further include at least one of 4.00% or less of Ni, 6.50% or less of Co and 0.20% or less of N. The isotropic tool steel has cleanliness with respect to non-metallic inclusions defined by JIS G 0555 of dA60.times.400.ltoreq.0.010% and d(B+C)60.times.400.ltoreq.0.020%, and a ratio of transverse direction toughness to longitudinal direction toughness of more than 0.70. Since it is highly resistant to the generation and propagation of cracks and fracture, dies for hot working made therefrom can enjoy a long life.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: March 8, 1988
    Assignee: Hitachi Metals, Ltd.
    Inventors: Tamiya Kishida, Mitsuru Suzuki, Toshio Okuno, Atsusuke Nakao
  • Patent number: H326
    Abstract: Manganese-iron base and manganese-chromium-iron base austenitic alloys designed to have resistance to neutron irradiation induced swelling and low activation have the following compositions (in weight percent): 20 to 40 Mn; up to about 15 Cr; about 0.4 to about 3.0 Si; an austenite stabilizing element selected from C and N, alone or in combination with each other, and in an amount effective to substantially stabilize the austenite phase, but less than about 0.7 C, and less than about 0.3 N; up to about 2.5 V; up to about 0.1 P; up to about 0.01 B; up to about 3.0 Al; up to about 0.5 Ni; up to about 2.0 W; up to about 1.0 Ti; up to about 1.0 Ta; and with the remainder of the alloy being essentially iron.
    Type: Grant
    Filed: June 23, 1986
    Date of Patent: September 1, 1987
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Howard R. Brager, Francis A. Garner