Patents Examined by Deborah Yee
  • Method of manufacturing martensitic stainless steel sheet using twin roll strip caster
    Patent number: 9677159
    Abstract: A method of manufacturing a martensitic stainless steel sheet by allowing ingot steel to pass through two casting rolls rotating in opposing directions through a twin roll strip caster is provided. The method includes rolling a steel sheet cast between the casting rolls at a temperature of 1000 to 1200° C. and a draft percentage of 25 to 50% with a first roller, and rolling the steel sheet at a temperature of 800 to 1000° C. and a draft percentage of 5 to 15% with a second roller.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: June 13, 2017
    Assignee: POSCO
    Inventors: Man-Jin Ha, Sung-Jin Park, Byoung-Jun Song
  • Fe-based metal plate and method of manufacturing the same
    Patent number: 9679687
    Abstract: On at least one surface of a base metal plate (1) of an ?-? transforming Fe or Fe alloy, a metal layer (2) containing ferrite former is formed. Next, the base metal plate (1) and the metal layer (2) are heated to an A3 point of the Fe or the Fe alloy, whereby the ferrite former are diffused into the base metal plate (1) to form an alloy region (1b) in a ferrite phase in which an accumulation degree of {200} planes is 25% or more and an accumulation degree of {222} planes is 40% or less. Next, the base metal plate (1) is heated to a temperature higher than the A3 point of the Fe or the Fe alloy, whereby the accumulation degree of the {200} planes is increased and the accumulation degree of the {222} planes is decreased while the alloy region (11b) is maintained in the ferrite phase.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: June 13, 2017
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Tooru Inaguma, Miho Tomita, Youji Mizuhara, Hiroaki Sakamoto
  • High strength hot dip galvanised steel strip
    Patent number: 9677150
    Abstract: A high strength hot dip galvanized steel strip including, in mass percent, of the following elements: 0.10-0.18% C, 1.90-2.50% Mn, 0.30-0.50% Si, 0.50-0.70% Al, 0.10-0.50% Cr, 0.001-0.10% P, 0.01-0.05% Nb, max 0.004% Ca, max 0.05% S, max 0.007% N, and optionally at least one of the following elements: 0.005-0.50% Ti, 0.005-0.50% V, 0.005-0.50% Mo, 0.005-0.50% Ni, 0.005-0.50% Cu, max 0.005% B, the balance Fe and inevitable impurities, wherein 0.80%<Al+Si<1.05% and Mn+Cr>2.10%. This steel offers improved formability at a high strength, has a good weldability and surface quality together with a good produce-ability and coat-ability.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: June 13, 2017
    Assignee: TATA STEEL IJMUIDEN B.V.
    Inventors: Bernard Leo Ennis, David Neal Hanlon
  • Three-piece can and method of manufacturing the same
    Patent number: 9669961
    Abstract: A three-piece can includes a can body obtained by forming a steel sheet such that a roundness of the can is 0.34 mm or less. The steel sheet contains: by mass %, C: 0.020% or more and 0.100% or less; Si: 0.10% or less; Mn: 0.10% or more and 0.80% or less; P: 0.001% or more and 0.100% or less; S: 0.001% or more and 0.020% or less; Al: 0.005% or more and 0.100% or less; and N: 0.0130% or more and 0.0200% or less. The balance is Fe and inevitable impurities. The steel sheet has a yield strength of 440 MPa or more and a total elongation of 12% or more.
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: June 6, 2017
    Assignee: JFE Steel Corporation
    Inventors: Masaki Tada, Katsumi Kojima, Hiroki Nakamaru, Yoichi Tobiyama
  • High strength hot-rolled steel sheet having excellent ductility, stretch flangeability and uniformity and method of manufacturing the same
    Patent number: 9657380
    Abstract: A slab has a steel composition including 0.020% to 0.065% of C, 0.1% or less of Si, 0.40% to less than 0.80% of Mn, 0.030% or less of P, 0.005% or less of S, 0.08% to 0.16% of Ti, 0.005% to 0.1% of Al, 0.005% or less of N, and the balance being Fe and incidental impurities, in which Ti*(=Ti?(48/14)×N) satisfies [Ti*?0.08] and [0.300?C/Ti*?0.375], is subjected to hot rolling to obtain a hot-rolled steel sheet in which the steel microstructure includes, in terms of area fraction, 95% or more of a ferrite phase; the average ferrite grain size is 10 ?m or less; the average grain size of Ti carbides precipitated in steel is 10 nm or less; and Ti in the amount of 80% or more of Ti* is precipitated as Ti carbides.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: May 23, 2017
    Assignee: JFE Steel Corporation
    Inventors: Noriaki Kosaka, Kazuhiro Seto, Hidetaka Kawabe
  • High strength steel plate having low yield ratio excellent in terms of strain ageing resistance, method of manufacturing the same and high strength welded steel pipe made of the same
    Patent number: 9657868
    Abstract: A steel plate has a chemical composition containing, by mass %, C: 0.03% or more and 0.08% or less, Si: 0.01% or more and 1.0% or less, Mn: 1.2% or more and 3.0% or less, P: 0.015% or less, S: 0.005% or less, Al: 0.08% or less, Nb: 0.005% or more and 0.07% or less, Ti: 0.005% or more and 0.025% or less, N: 0.010% or less, O: 0.005% or less and the balance being Fe and inevitable impurities, a metallographic structure including a bainite phase and island martensite, and a polygonal ferrite in surface portions within 5 mm from the upper and lower surfaces, wherein the area fraction of the island martensite is 3% to 15%, the equivalent circle diameter of the island martensite is 3.0 ?m or less, the area fraction of the polygonal ferrite in the surface portions is 10% to less than 80%.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: May 23, 2017
    Assignee: JFE Steel Corporation
    Inventors: Junji Shimamura, Kimihiro Nishimura
  • High-strength hot rolled steel sheet
    Patent number: 9657382
    Abstract: A high-strength hot rolled steel sheets with excellent stretch flangeability has small variations in mechanical properties in individual coils. Variations in strength from place to place in a coil are decreased by minimally reducing the Si and Mn contents to suppress the occurrence of problems such as segregation. Further, the microstructure of the steel sheets is configured such that a ferrite phase represents an area ratio of not less than 95%, the ferrite crystal grains have an average grain size of not less than 1 ?m, and the ferrite crystal grains contain TiC with an average particle size of not more than 7 nm dispersed in the crystal grains.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: May 23, 2017
    Assignee: JFE Steel Corporation
    Inventors: Yoshimasa Funakawa, Tetsuo Yamamoto, Hiroshi Uchomae, Hiroshi Nakano, Taro Kizu
  • Seamless steel pipe for hollow spring
    Patent number: 9650704
    Abstract: A seamless steel pipe for a hollow spring includes C: 0.2 to 0.7 mass %, Si: 0.5 to 3 mass %, Mn: 0.1 to 2 mass %, Cr: 3 mass % or less (excluding 0 mass %), Al: 0.1 mass % or less (excluding 0 mass %), P: 0.02 mass % or less (excluding 0 mass %), S: 0.02 mass % or less (excluding 0 mass %) and N: 0.02 mass % or less (excluding 0 mass %). A residual austenite content in an inner surface layer part of the steel pipe is 5 vol. % or less. An average grain size of a ferrite-pearlite structure in the inner surface layer part of the steel pipe is 18 ?m or less. A number density of a carbide having a circle equivalent diameter of 500 nm or more and being present in the inner surface layer part of the steel pipe is 1.8×10?2 particles/?m2 or less.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: May 16, 2017
    Assignees: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.), SHINKO METAL PRODUCTS CO., LTD.
    Inventors: Takuya Kochi, Hitoshi Hatano, Eiichi Tamura, Kotaro Toyotake
  • Substrate material of iron-nickel alloy metal foil for CIGS solar cells
    Patent number: 9653629
    Abstract: The present invention relates to an exclusive alloy substrate material for CIGS solar cells. Particularly, the present invention provides a substrate material having a thermal expansion coefficient similar to that of a CIGS layer. The substrate material according to the present invention may prevent damage such as interlayer separation due to differing thermal expansion coefficients from occurring because the substrate material has a thermal expansion coefficient similar to that of the CIGS layer.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: May 16, 2017
    Assignee: KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY
    Inventors: Tai Hong Yim, Heung Yeol Lee, Tae Jin Hwang, Young Sik Song, Yong Ki Cho, Min Su Lee, Yoon Ho Han
  • High-strength flat steel product and method for producing same
    Patent number: 9650708
    Abstract: A flat steel product having a tensile strength of at least 1200 MPa and consists of steel containing (wt %) C: 0.10-0.50%, Si: 0.1-2.5%, Mn: 1.0-3.5%, Al: up to 2.5%, P: up to 0.020%, S: up to 0.003%, N: up to 0.02%, and optionally one or more of the elements “Cr, Mo, V, Ti, Nb, B and Ca” in the quantities: Cr: 0.1-0.5%, Mo: 0.1-0.3%, V: 0.01-0.1%, Ti: 0.001-0.15%, Nb: 0.02-0.05%, wherein ?(V, Ti, Nb)?0.2% for the sum of the quantities of V, Ti and Nb, B: 0.0005-0.005%, and Ca: up to 0.01% in addition to Fe and unavoidable impurities. The flat steel product has a microstructure with (in surface percent) less than 5% ferrite, less than 10% bainite, 5-70% untempered martensite, 5-30% residual austenite, and 25-80% tempered martensite, at least 99% of the iron carbide contained in the tempered martensite having a size of less than 500 nm.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: May 16, 2017
    Assignee: ThyssenKrupp Steel Europe AG
    Inventors: Jens-Ulrik Becker, Jian Bian, Thomas Heller, Rudolf Schoenenberg, Richard G. Thiessen, Sabine Zeizinger, Thomas Rieger, Oliver Bulters
  • Method for fabricating vane using a nodular graphite cast iron
    Patent number: 9644245
    Abstract: A nodular graphite cast iron, a method for fabricating a vane for a rotary compressor using nodular graphite cast iron, and a vane for a rotary compressor using the same are provided. The nodular graphite cast iron includes 3.4 wt % to 3.9 wt % of carbon (C), 2.0 wt % to 3.0 wt % of silicon (Si), 0.3 wt % to 1.0 wt % of manganese (Mn), 0.1 wt % to 1.0 wt % of chromium (Cr), 0.04 wt % to 0.15 wt % of titanium (Ti), less than 0.08 w % of phosphorus (P), less than 0.025 wt % of sulphur (S), 0.03 wt % to 0.05 wt % of magnesium (Mg), 0.02 wt % to 0.04 wt % of rare earth resource, iron (Fe) and impurities as the remnants, and includes a bainite matrix structure, nodular graphite, and 15 vol % to 35 vol % of carbide.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: May 9, 2017
    Assignee: LG ELECTRONICS INC.
    Inventor: Jaebong Park
  • Methods for manufacturing a high-strength press-formed member
    Patent number: 9644247
    Abstract: A method for manufacturing a high strength press-formed member includes preparing a steel sheet having the composition including by mass %: C: 0.12% to 0.69%, Si: 3.0% or less, Mn: 0.5% to 3.0%, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, N: 0.010% or less, Si+Al: at least 0.7%, and remainder as Fe and incidental impurities, heating the steel sheet to a temperature of 750° C. to 1000° C. and retaining the steel sheet in that state for 5 seconds to 1000 seconds; subjecting the steel sheet to hot press-forming at a temperature of 350° C. to 900° C.; cooling the steel sheet to a temperature of 50° C. to 350° C.; heating the steel sheet to a temperature in a temperature region of 350° C. to 490° C.; and retaining the steel sheet at temperature in the temperature region for 5 seconds to 1000 seconds.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: May 9, 2017
    Assignee: JFE Steel Corporation
    Inventors: Hiroshi Matsuda, Yoshimasa Funakawa, Yasushi Tanaka
  • Method for producing hot-formed and press-hardened automobile column
    Patent number: 9637174
    Abstract: A method for producing an automobile column is disclosed. The automobile column has a region of a first type and a region of a second type which have mutually different strengths. A transition region having a width of less than 50 mm is formed between the two regions. The automobile column has in the region of the first type a bainitic structure and in the region of the second type a martensitic structure.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: May 2, 2017
    Assignee: BENTELER AUTOMOBILTECHNIK GMBH
    Inventors: Andreas Zimmermann, Jan Dingemans, Markus Pellmann, Johannes Böke
  • Double cold reduction strip for shadow mask and process for producing the same
    Patent number: 9623457
    Abstract: The present invention discloses a double cold reduction strip for shadow mask and a process for producing the same, comprising the following procedures: converter steelmaking?continuous billet casting?hot rolling?pickling and cold rolling?continuous annealing?double cold reduction?finishing and oiling. The weight percentages of essential elements of the shadow mask strip are: C: ?0.001%, Mn: 0.10˜0.40%, Al: 0.02˜0.06%, Si: ?0.025%, P: ?0.015%, S: ?0.01%, O: ?0.004%, with remainders composed of Fe and inevitable impurities.
    Type: Grant
    Filed: May 17, 2013
    Date of Patent: April 18, 2017
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Shoumin Wu, Xiujun Li
  • Stainless steel foil and catalyst carrier for exhaust gas purifying device using the foil
    Patent number: 9624563
    Abstract: Provided are a stainless steel foil and a catalyst carrier for an exhaust gas purifying device which uses the foil. Specifically, 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, more than 15.0% and less than 25.0% of Cr, 0.30% or less of Ni, 3.0% to 10.0% of Al, 0.03% to 1.0% of Cu, 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, 0.03% to 0.20% of REM excluding Ce, 0.02% or less of Ce, 2.0% 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 28, 2012
    Date of Patent: April 18, 2017
    Assignee: JFE Steel Corporation
    Inventors: Akito Mizutani, Mitsuyuki Fujisawa, Hiroki Ota, Yasushi Kato
  • Corrosion resistant lean austenitic stainless steel
    Patent number: 9624564
    Abstract: An austenitic stainless steel composition having low nickel and molybdenum and exhibiting high corrosion resistance and good formability. The austenitic stainless steel includes, in weight %, up to 0.20 C, 2.0-6.0 Mn, up to 2.0 Si, 16.0-23.0 Cr, 5.0-7.0 Ni, up to 3.0 Mo, up to 3.0 Cu, 0.1-0.35 N, up to 4.0 W, up to 0.01 B, up to 1.0 Co, iron and impurities. The austenitic stainless steel has a ferrite number less than 11 and an MD30 value less than ?10° C.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: April 18, 2017
    Assignee: ATI PROPERTIES LLC
    Inventors: David S. Bergstrom, James M. Rakowski, Charles P. Stinner, John J. Dunn, John F. Grubb
  • Heat-resistant austenitic stainless steel highly inhibited from exfoliating scale, and stainless steel tube
    Patent number: 9617627
    Abstract: This heat-resistant austenitic stainless steel has a specific composition containing Ce and Zr and has an Hv1/Hv0 ratio of 1.20 or higher, where Hv1 is the average hardness of the area ranging from the surface to a thickness-direction depth of 50 ?m and Hv0 is the average hardness of the thickness-direction central part.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: April 11, 2017
    Assignee: Kobe Steel, Ltd.
    Inventors: Takeo Miyamura, Shigenobu Namba
  • Lean austenitic stainless steel
    Patent number: 9617628
    Abstract: An austenitic stainless steel having low nickel and molybdenum and exhibiting comparable corrosion resistance and formability properties to higher nickel and molybdenum alloys comprises, in weight %, up to 0.20 C, 2.0-9.0 Mn, up to 2.0 Si, 16.0-23.0 Cr, 1.0-5.0 Ni, up to 3.0 Mo, up to 3.0 Cu, 0.1-0.35 N, up to 4.0 W, up to 0.01 B, up to 1.0 Co, iron and impurities, the steel having a ferrite number of less than 10 and a MD30 value of less than 20° C.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: April 11, 2017
    Assignee: ATI PROPERTIES LLC
    Inventors: David S. Bergstrom, James M. Rakowski, Charles P. Stinner, John J. Dunn, John F. Grubb
  • Spring steel and method for manufacturing the same
    Patent number: 9618070
    Abstract: Disclosed is high strength spring steel that can limit the depth of pitting occurring when corroded and therefore possesses high strength as well as excellent pitting corrosion resistance and corrosion fatigue property, with a composition containing: C: greater than 0.35 mass % and less than 0.50 mass %; Si: greater than 1.75 mass % and less than or equal to 3.00 mass %; Mn: 0.2 mass % to 1.0 mass %; Cr: 0.01 mass % to 0.04 mass %; P: 0.025 mass % or less; S: 0.025 mass % or less; Mo: 0.1 mass % to 1.0 mass %; and O: 0.0015 mass % or less, under a condition that a PC value calculated by PC=4.2×([C]+[Mn])+0.1×(1/[Si]+1/[Mo])+20.3×[Cr]+0.001×(1/[N]) is greater than 3.3 and equal to or less than 8.0. Also disclosed is a preferred method for manufacturing the same.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: April 11, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Minoru Honjo, Kazukuni Hase, Hideto Kimura
  • Process for manufacturing steel, for hot forming or quenching in a tool, having improved ductility
    Patent number: 9611517
    Abstract: The invention relates to a steel part, the composition of the steel of which comprises, the contents being expressed by weight: 0.040%?C?0.100%; 0.80%?Mn?2.00%; Si?0.30%; S?0.005%; P?0.030%; 0.010%?Al?0.070%; 0.015%?Nb?0.100%; 0.030%?Ti?0.080%; N?0.009%; Cu?0.100%; Ni?0.100%; Cr?0.100%; Mo?0.100%; and Ca?0.006%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel consisting of at least 75% equiaxed ferrite, martensite in an amount not less than 5% but not exceeding 20%, and bainite in an amount not exceeding 10%.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: April 4, 2017
    Assignee: ArcelorMittal France
    Inventors: Jean-Pierre Laurent, Thierry Malot