Patents Examined by Jie Yang
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Patent number: 11060168Abstract: Processes for producing low nitrogen, essentially nitride-free chromium or chromium plus niobium-containing nickel-based alloys include charging elements or compounds which do not dissolve appreciable amounts of nitrogen in the molten state to a refractory crucible within a vacuum induction furnace, melting said elements or compounds therein under reduced pressure, and effecting heterogeneous carbon-based bubble nucleation in a controlled manner. The processes also include, upon cessation of bubble formation, adding low nitrogen chromium or a low nitrogen chromium-containing master alloy with a nitrogen content of below 10 ppm to the melt, melting and distributing said added chromium or chromium-containing master alloy throughout the melt, bringing the resulting combined melt to a temperature and surrounding pressure to permit tapping, and tapping the resulting melt, directly or indirectly, to a metallic mold and allowing the melt to solidify and cool under reduced pressure.Type: GrantFiled: January 11, 2017Date of Patent: July 13, 2021Assignee: COMPANHIA BRASILEIRA DE METALURGIA E MINERACÂOInventor: Kleber A. Sernik
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Patent number: 11062843Abstract: A method for producing a sintered R-T-B based magnet includes the steps of: providing a sintered R1-T-B based magnet work (where R1 is a rare-earth element; T is Fe, or Fe and Co); providing a powder of an alloy in which a rare-earth element R2 accounts for 40 mass % or more of the entire alloy, the rare-earth element R2 always including Dy and/or Tb; subjecting the powder to a heat treatment to obtain a diffusion source; and heating the sintered R1-T-B based magnet work with the diffusion source to allow the at least one of Dy and Tb contained in the diffusion source to diffuse from the surface into the interior of the sintered R1-T-B based magnet work. The alloy powder is a powder produced by atomization.Type: GrantFiled: September 27, 2018Date of Patent: July 13, 2021Assignee: HITACHI METALS, LTD.Inventor: Futoshi Kuniyoshi
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Patent number: 11053571Abstract: We have developed a scalable approach to directly incorporate grain-refining nanoparticles into conventional hot-tear-susceptible pure aluminum or aluminum alloy powders. These aluminum alloy powders may be additively manufactured into high-strength, crack-free aluminum alloys with fine equiaxed microstructures by incorporating nanoparticle nucleants to control solidification during additive manufacturing. Some variations provide an additively manufactured aluminum alloy comprising aluminum and at least one grain-refining element, wherein the additively manufactured aluminum alloy has a microstructure with equiaxed grains. Pure aluminum or aluminum alloys, combined with grain refiners, are useful in many processes beyond additive manufacturing. Some variations provide an aluminum alloy comprising aluminum and grain-refining nanoparticles selected from zirconium, tantalum, niobium, or titanium, wherein the aluminum alloy has a microstructure that is substantially crack-free with equiaxed grains.Type: GrantFiled: December 18, 2018Date of Patent: July 6, 2021Assignee: HRL Laboratories, LLCInventors: John H. Martin, Brennan Yahata
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Patent number: 11041232Abstract: An austenitic stainless steel is provided which has a chemical composition that consists, by mass %, of: C: 0.015% or less, Si: 1.00% or less, Mn: 2.00% or less, P: 0.05% or less, S: 0.030% or less, Cr: 16.0% or more and less than 22.0%, Ni: 11.0 to 16.0%, Mo: 2.5 to 5.0%, N: 0.07% or more and less than 0.15%, Nb: 0.20 to 0.50%, Al: 0.005 to 0.040%, Sn: 0 to 0.080%, Zn: 0 to 0.0060%, Pb: 0 to 0.030%, and the balance: Fe and impurities, and that satisfies the formula [MoSS/Mo?0.98] (MoSS: Mo amount dissolved in the steel).Type: GrantFiled: April 6, 2017Date of Patent: June 22, 2021Assignee: Nippon Steel CorporationInventors: Masahiro Seto, Masayuki Sagara, Kenta Yamada, Takahiro Osuki
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Patent number: 11041220Abstract: Provided is a blast furnace operation method that enables lowering of the reducing agent ratio of a blast furnace. The blast furnace operation method includes injecting pulverized coal through tuyeres of a blast furnace. The method includes adjusting coal containing moisture and volatile matter to form adjusted pulverized coal having a specific surface area within a range of 2 m2/g or more and 1000 m2/g or less, a lower heating value of 27170 kJ/kg or more, and a volatile matter content within a range of 3 mass % or more and 25 mass % or less. The method further includes injecting, through the tuyeres of the blast furnace, pulverized coal in which the adjusted pulverized coal, in a mixing ratio of 10 mass % or more, is mixed.Type: GrantFiled: March 23, 2017Date of Patent: June 22, 2021Assignee: JFE Steel CorporationInventors: Naoki Yamamoto, Akinori Murao, Kota Moriya, Nobuyuki Oyama
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Patent number: 11035026Abstract: Al—Fe—Si alloys having optimized properties through the use of additives are disclosed. In some aspects, an alloy includes aluminum in a first amount, iron in a second amount, silicon in a third amount, and an additive in a fourth amount. The additive is selected from the group consisting of a non-metal additive, a transition-metal additive, a rare-metal additive, and combinations thereof. The first amount, the second amount, the third amount, and the fourth amount produce an alloy with a stoichiometric formula (Al1-xAx)3Fe2Si where A is the additive.Type: GrantFiled: October 10, 2018Date of Patent: June 15, 2021Assignee: GM Global Technology Operations LLCInventors: Zhongyi Liu, Daad B. Haddad, Julie A. Swartz
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Patent number: 11021776Abstract: A hot rolled, ultra-high strength, complex metallographic structured or multi-phase structured steel that improves formability during stamping or forming process, while possessing one or more of the following properties: excellent castability, rollability and coatability, excellent structural performance, excellent stretch formability, excellent stretch flangeability, excellent dent resistance, excellent durability, excellent impact performance, excellent intrusion and crash resistance without the purposeful addition of boron.Type: GrantFiled: November 3, 2017Date of Patent: June 1, 2021Assignee: NUCOR CORPORATIONInventor: Weiping Sun
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Patent number: 11021775Abstract: In one aspect, cobalt-based alloys are described herein comprising composition and microstructure permitting a balance of hardness, toughness and wear resistance desirable for wood cutting applications. A cobalt-based alloy comprises a chromium rich carbide phase in an amount of 15-30 volume percent, a tungsten-rich phase in an amount of 9-15 volume percent and a balance of cobalt-rich solid solution matrix comprising nickel, chromium, vanadium and tungsten.Type: GrantFiled: October 25, 2017Date of Patent: June 1, 2021Assignee: KENNAMETAL INC.Inventors: Matthew Yao, Abdelhakim Belhadjhamida, Brad McLane
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Patent number: 11015237Abstract: Disclosed herein is a shape memory alloy comprising 48 to 50 atomic percent nickel, 15 to 30 atomic percent hafnium, 1 to 5 atomic percent aluminum; with the remainder being titanium. Disclosed herein too is a method of manufacturing a shape memory alloy comprising mixing together to form an alloy nickel, hafnium, aluminum and titanium in amounts of 48 to 50 atomic percent nickel, 15 to 30 atomic percent hafnium, 1 to 5 atomic percent aluminum; with the remainder being titanium; solution treating the alloy at a temperature of 700 to 1300° C. for 50 to 200 hours; and aging the alloy at a temperature of 400 to 800° C. for a time period of 50 to 200 hours to form a shape memory alloy.Type: GrantFiled: February 6, 2020Date of Patent: May 25, 2021Assignee: University of Florida Research Foundation, Inc.Inventors: Michele Viola Manuel, Derek Hsen Dai Hsu
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Patent number: 10998157Abstract: It is an object to provide a tungsten alloy exhibiting characteristics equal to or higher in characteristics than those of a thorium-containing tungsten alloy, without using thorium which is a radioactive material, and a discharge lamp, a transmitting tube, and a magnetron using the tungsten alloy. According to the present invention, a tungsten alloy includes 0.1 to 5 wt % of Zr in terms of ZrC.Type: GrantFiled: July 8, 2019Date of Patent: May 4, 2021Assignees: Kabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.Inventors: Shinichi Yamamoto, Kayo Nakano, Hiromichi Horie
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Patent number: 10995387Abstract: A weathering steel made by preparing a molten melt producing an as-cast carbon alloy steel strip with a corrosion index of at least 6.0 comprising, by weight, 0.02%-0.08% carbon, <0.6% silicon, 0.2%-2.0% manganese, <0.03% phosphorus, <0.01% sulfur, <0.01% nitrogen, 0.2%-0.5% copper, 0.01%-0.2% niobium, 0.01%-0.2% vanadium, 0.1%-0.4% chromium, 0.08%-0.25% nickel, <0.01% aluminum, and the remainder iron and impurities. The molten melt is solidified and cooled into a cast strip 4 mm in thickness in a non-oxidizing atmosphere. The strip is hot rolled in an austenitic temperature range above Ar3 to between 10% and 50% reduction, cooled at above 20° C./s and coiled below 700° C. to form a steel strip with a microstructure comprising bainite and acicular ferrite with more than 70% niobium in solid solution. Then, age hardening the strip resulting in a yield strength of at least 550 MPa and a total elongation of at least 8%.Type: GrantFiled: November 29, 2018Date of Patent: May 4, 2021Assignee: Nucor CorporationInventors: James W. Watson, Tao Wang, Eric Young, Chad Baudendistel
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Patent number: 10995398Abstract: A preferred embodiment is an uncoated, biodegradable stent. The stent has a filigree structure of magnesium alloy struts. The struts of the supporting structure are arranged to permit a compressed form for introduction into the body and to permit an expanded form at the site of the application within a vessel. The magnesium alloy struts are formed of a corrodible magnesium alloy. The magnesium alloy is formed from high-purity vacuum distilled magnesium containing impurities, which promote electrochemical potential differences and/or the formation of precipitations and/or intermetallic phases. The impurities are such that the struts of the stent have a tensile strength of >275 MPa a yield point of >200 MPa, a yield ratio of <0.8, a difference between tensile strength and yield point of >50 MPa.Type: GrantFiled: March 23, 2018Date of Patent: May 4, 2021Assignee: BIOTRONIK AGInventors: Heinz Mueller, Peter Uggowitzer, Joerg Loeffler
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Patent number: 10995394Abstract: A steel bar for a downhole member is provided that is excellent in SCC resistance and SSC resistance. A martensitic stainless steel bar material for a downhole member of the present embodiment has a chemical composition that contains, by mass %, C: 0.020% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.03% or less, S: 0.01% or less, Cu: 0.10 to 2.50%, Cr: 10 to 14%, Ni: 1.5 to 7.0%, Mo: 0.2 to 3.0%, Ti: 0.05 to 0.3%, V: 0.01 to 0.10%, Nb: 0.1% or less, Al: 0.001 to 0.1% and N: 0.05% or less, with the balance being Fe and impurities, and satisfies Formula (1) and Formula (2). [Mo]?4×[total Mo amount in precipitate at R/2 position]?1.30??(1) [Total Mo amount in precipitate at center position]?[total Mo amount in precipitate at R/2 position]?0.Type: GrantFiled: May 19, 2017Date of Patent: May 4, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Daisuke Matsuo, Takuji Nakahata, Hisashi Amaya, Tsutomu Okuyama, Hideki Takabe
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Patent number: 10995380Abstract: A press hardening steel by a thin slab casting and direct rolling has a tensile strength of 1500 MPa or more. The press hardening steel has a components by weight percent: C: 0.21-0.25%, Si: 0.26-0.30%, Mn: 1.0-1.3%, P?0.01%, S?0.005%, Als: 0.015-0.060%, Cr: 0.25-0.30%, Ti: 0.026-0.030% or Nb: 0.026-0.030% or V: 0.026-0.030%, or a mixture of two or more of the above in any proportion; B: 0.003-0.004%, and N?0.005%. A method for producing the press hardening steel includes following steps: hot metal desulphurization; electric-furnace or converter smelting and refining; continuous casting; descaling, then entering a soaking furnace; heating and soaking; high-pressure water descaling, then entering a rolling mill; hot rolling; cooling; coiling; austenitizing; die deforming and quenching.Type: GrantFiled: August 1, 2017Date of Patent: May 4, 2021Assignee: WUHAN IRON AND STEEL COMPANY LIMITEDInventors: Xinping Mao, Kuanhui Hu, Shuize Wang, Libo Pan, Rui Ge, Lijun Li, Tao Peng, Xiaofeng Du, Wenqiang Zhou
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Patent number: 10995396Abstract: A rail according to an aspect of the present invention is manufactured by melting steel using an electric furnace, satisfies a predetermined range as a chemical composition and particularly includes Pb: 0.0003% to 0.0020%, 95 area % or more of a region from an outer surface of a head portion to a depth of 20 mm is a pearlite structure, and a hardness in the region from the outer surface of the head portion to the depth of 20 mm is in a range of Hv 300 to Hv 500.Type: GrantFiled: May 19, 2017Date of Patent: May 4, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Masaharu Ueda, Teruhisa Miyazaki
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Patent number: 10988820Abstract: A press hardening steel by a medium thin slab and having a tensile strength of 1500 MPa or more, includes following components by weight percent: C: 0.21%-0.25%, Si: 0.26%-0.30%, Mn: 1.0%-1.3%, P?0.01%, S?0.005%, Als: 0.015%-0.060%, Cr: 0.25%-0.30%, Ti: 0.026%-0.030% or Nb: 0.026%-0.030% or V: 0.026%-0.030% or a mixture of any two or more of the above in any proportion, B: 0.003%-0.004%, Mo: 0.17-0.19% and N?0.005%. A method for producing the press hardening steel includes following steps: molten iron desulphurization; smelting and refining by an electric furnace or converter; continuous casting; descaling treatment before entering a soaking furnace; hating and soaking; high pressure water descaling before entering a rolling mill; hot rolling; cooling; coiling; austenitizing; die deforming and quenching.Type: GrantFiled: August 1, 2017Date of Patent: April 27, 2021Assignee: WUHAN IRON AND STEEL COMPANY LIMITEDInventors: Xinping Mao, Kuanhui Hu, Shuize Wang, Libo Pan, Rui Ge, Lijun Li, Tao Peng, Xiaofeng Du, Fang Fang
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Patent number: 10988823Abstract: The present invention provides an annealed steel material having a composition containing, in mass %, 0.28?C?0.42, 0.01?Si?1.50, 0.20?Mn?1.20, 4.80?Cr?6.00, 0.80?Mo?3.20, 0.40?V?1.20, and 0.002?N?0.080, with the balance being Fe and unavoidable impurities; in which the annealed steel material has a cross-sectional size of a thickness of 200 mm or more and a width of 250 mm or more, and a hardness of 100 HRB or less; and in which a diameter of a largest ferritic grain observed in a microstructure is 120 ?m or less in terms of a perfect circle equivalent, an area ratio of carbides is 3.0% or more and less than 10.5%, and an average particle diameter of the carbides is 0.18 ?m or more and 0.29 ?m or less.Type: GrantFiled: March 26, 2018Date of Patent: April 27, 2021Assignee: DAIDO STEEL CO., LTD.Inventor: Masamichi Kawano
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Patent number: 10988818Abstract: An efficient long-service-life blowing method include the steps of introducing vanadium extraction converter flue gas and decarburization converter flue gas into an oxygen combustor; obtaining first-purity CO2—N2 mixed gas through the vanadium extraction converter flue gas; obtaining second-purity CO2—N2 mixed gas through the decarburization converter flue gas; obtaining O2—CO2—N2 mixed gas through the decarburization converter flue gas; obtaining first-purity CO2 gas through the second-purity CO2—N2 mixed gas; and using the first-purity CO2—N2 mixed gas for bottom blowing of the vanadium extraction converter, using the second-purity CO2—N2 mixed gas as a carrier gas for blowing iron ore powder into the vanadium extraction converter, and using the O2—CO2—N2 mixed gas and the first-purity CO2 gas as a carrier gas for bottom blowing of the decarburization converter and bottom injecting of lime powder into the decarburization converter.Type: GrantFiled: July 10, 2020Date of Patent: April 27, 2021Assignee: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJINGInventors: Rong Zhu, Shaoyan Hu, Kai Dong, Guangsheng Wei, Haoran Ma, Weifeng Li, Yun Zhou, Zhihui Li, Wenhe Wu, Baochen Han, Chao Feng, Rongfang Su
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Patent number: 10984932Abstract: An amorphous soft magnetic alloy of the formula (Fe1-?TM?)100-w-x-y-zPwBxLySiz TipCqMnrCus, wherein TM is Co or Ni; L is Al, Cr, Zr, Mo or Nb; 0???0.3, 2?w?18 at %, 2?x?18 at %, 15?w+x?23 at %, 1<y?5 at %, 0?z?4 at %; p, q, r, and s represents an addition ratio such that the total mass of Fe, TM, P, B, L and Si is 100, and 0?p?0.3, 0?q?0.5, 0?r?2, 0?s?1 and r+s>0; the composition fulfills one of the following conditions: L is Cr, Zr, Mo or Nb; or L is a combination of Al and Cr, Zr, Mo or Nb, wherein 0<Al?5 at %, 1?Cr?4 at %, 0<Zr?5 at %, 2?Mo?5 at %, and 2?Nb?5 at %; the alloy has a crystallization start temperature (Tx) which is 550° C. or less, a glass transition temperature (Tg) which is 520° C. or less, and a supercooled liquid region represented by ?Tx=Tx?Tg, which is 20° C. or more.Type: GrantFiled: June 19, 2017Date of Patent: April 20, 2021Assignees: TOKIN CORPORATION, TOHOKU UNIVERSITYInventors: Akiri Urata, Teruhiko Fujiwara, Hiroyuki Matsumoto, Yasunobu Yamada, Akihisa Inoue
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Patent number: 10975450Abstract: A low alloy high strength thick-walled seamless steel pipe for oil country tubular goods is provided having a wall thickness of 40 mm or more and a yield strength of 758 MPa or more, the steel pipe including a composition containing, in terms of mass %, C: 0.25 to 0.31%, Si: 0.01 to 0.35%, Mn: 0.55 to 0.70%, P: 0.010% or less, S: 0.001% or less, O: 0.0015% or less, Al: 0.015 to 0.040%, Cu: 0.02 to 0.09%, Cr: 0.8 to 1.5%, Mo: 0.9 to 1.6%, V: 0.04 to 0.10%, Nb: 0.005 to 0.05%, B: 0.0015 to 0.0030%, Ti: 0.005 to 0.020%, and N: 0.005% or less, and having Ti/N of 3.0 to 4.0, with the balance being Fe and inevitable impurities, wherein a cumulative frequency rate at a measurement point at which a Mo segregation degree by a predetermined expression is 1.5 or more is 1% or less.Type: GrantFiled: November 18, 2016Date of Patent: April 13, 2021Assignee: JFE Steel CorporationInventors: Mitsuhiro Okatsu, Masao Yuga, Kenichiro Eguchi, Haruo Nakamichi