Nine Percent Or More Chromium Containing Patents (Class 420/34)
  • Patent number: 10988825
    Abstract: A martensitic stainless steel has a chemical composition containing, by mass %, C: 0.030% or more and less than 0.20%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0% or less, P: 0.050% or less , S: 0.010% or less, Cr: 10.0% or more and 16.0% or less, Ni: 0.01% or more and 0.80% or less, Al: 0.001% or more and 0.50% or less, Zr: 0.005% or more and 0.50% or less, and N: 0.030% or more and less than 0.20%, with the balance consisting of Fe and inevitable impurities.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: April 27, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Tetsuyuki Nakamura, Shin Ishikawa, Chikara Kami
  • Patent number: 10920309
    Abstract: A nitrided packaging steel in the form of a flat steel product and method for producing a nitrided packaging steel with a carbon content of 10-1000 ppm and uncombined nitrogen, dissolved in the steel, of more than 100 ppm. The nitriding is performed in two stages: a first stage, in which a molten steel is nitrided to a nitrogen content of at most 160 ppm by introducing a nitrogen-containing gas and/or a nitrogen-containing solid into the molten steel, and a second stage, in which a flat steel product produced from the nitrided molten steel by cold rolling is treated with a nitrogen-containing gas in order to increase further the amount of uncombined nitrogen in the flat steel product.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: February 16, 2021
    Assignees: ThyssenKrupp Rasselstein GmbH, ThyssenKrupp AG
    Inventors: Burkhard Kaup, Blaise Massicot, Dirk Matusch
  • Patent number: 10563316
    Abstract: The present invention relates to an Fe—P—Cr alloy thin plate and a method for manufacturing the same. An embodiment of the present invention provides an Fe—P—Cr alloy thin plate including, in terms of wt %, P (6.0-13.0%), Cr (0.002-0.1%), and the balance of Fe and other inevitable impurities.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: February 18, 2020
    Assignee: POSCO
    Inventors: Dongkyun Kim, Hongseok Yang
  • Patent number: 10513747
    Abstract: A ferritic stainless steel sheet containing, by mass %, C: 0.020% or less, Cr: 10.0% to 25.0%, N: 0.020% or less, Sn: 0.010% to 0.50%, and one or more of Ti: 0.60% or less, Nb: 0.60% or less, V: 0.60% or less, and Zr: 0.60% or less so as to satisfy Equation (1): (Ti/48+V/51+Zr/91+Nb/93)/(C/12+N/14)?1.0, wherein a difference between a stress ?1 (N/mm2) after prestrain imparting tensile deformation with 7.5% of strain, and an upper yield stress ?2 (N/mm2) when the steel sheet is subjected to heat treatment at 200° C. for 30 minutes and then to tension again after the tensile deformation is 8 or less.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: December 24, 2019
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Ken Kimura, Junichi Hamada, Eiichiro Ishimaru, Akihito Yamagishi, Naoto Hansaki
  • Patent number: 10047419
    Abstract: The invention relates to a ferritic stainless steel having enhanced high temperature strength and good resistance to high cycle fatigue, creep and oxidation for use in high temperature service, for components such as automotive exhaust manifolds. The steel contains in weight % less than 0.03% carbon, 0.05-2% silicon, 0.5-2% manganese, 17-20% chromium, 0.5-2% molybdenum, less than 0.2% titanium, 0.3-1% niobium, 1-2% copper, less than 0.03% nitrogen, 0.001-0.005% boron, the rest of the chemical composition being iron and inevitable impurities occurring in stainless steels.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: August 14, 2018
    Assignee: Outokumpu Oyj
    Inventors: Bo Ivarsson, Mirva Kujansuu, Huiping Liu, Fredrik Olsson, Rachel Pettersson, Pascale Sotto Vangeli
  • Patent number: 9982545
    Abstract: The precipitation hardened martensitic stainless steel is characterized by containing, in percent by weight, 12.25 to 14.25% Cr, 7.5 to 8.5% Ni, 1.0 to 2.5% Mo, 0.05% or less C, 0.2% or less Si, 0.4% or less Mn, 0.03% or less P, 0.005% or less S, 0.008% or less N, 0.90 to 2.25% Al, the balance substantially being Fe, and the total content of Cr and Mo being 14.25 to 16.75%. A turbine moving blade and a steam turbine are manufactured by using this martensitic stainless steel.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: May 29, 2018
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yuichi Hirakawa, Yoshikuni Kadoya, Hiroharu Ooyama, Tatsuya Furukawa, Naoto Tochitani
  • Publication number: 20150147591
    Abstract: Disclosed herein are embodiments of iron-based corrosion resistant hardfacing alloys. The alloys can be designed through the use of different compositional, thermodynamic, microstructural, and performance criteria. In some embodiments, chromium content in the alloy can be increased while avoiding the formation of different hard chromium carbides, thereby increasing the corrosion resistance of the alloy.
    Type: Application
    Filed: November 26, 2014
    Publication date: May 28, 2015
    Inventors: Justin Lee Cheney, Shengjun Zhang, John Hamilton Madok, Jonathon Bracci
  • Patent number: 8980167
    Abstract: There is provided a cost-effective stainless steel pipe having excellent expandability for oil country tubular goods, the stainless steel pipe having excellent CO2 corrosion resistance under a severe corrosive environment containing CO2, Cl?, and the like. The stainless steel pipe having excellent expandability for oil country tubular goods contains 0.05% or less C, 0.50% or less Si, Mn: 0.10% to 1.50%, 0.03% or less P, 0.005% or less S, 10.5% to 17.0% Cr, 0.5% to 7.0% Ni, 3.0% or less Mo, 0.05% or less Al, 0.20% or less V, 0.15% or less N, and 0.008% or less O, optionally at least one selected from Nb, Cu, Ti, Zr, Ca, B, and W, in a specific content, and the balance being Fe and incidental impurities, wherein a microstructure mainly having a tempered martensitic phase has an austenitic phase content exceeding 20%.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: March 17, 2015
    Assignee: JFE Steel Corporation
    Inventors: Mitsuo Kimura, Yoshio Yamazaki, Masahito Tanaka
  • Patent number: 8961869
    Abstract: A hardfacing alloy for use as a surfacing on metal that are subjected to high thermal and mechanical stresses. The hardfacing alloy includes at least about 7 weight percent chromium, at least about 0.02 weight percent nitrogen, metal sensitization inhibitor, and a majority weight percent iron. The hardfacing alloy includes a low percentage of ferrite.
    Type: Grant
    Filed: January 24, 2005
    Date of Patent: February 24, 2015
    Assignee: Lincoln Global, Inc.
    Inventors: Ashish Kapoor, Teresa Melfi
  • Publication number: 20150013496
    Abstract: The invention relates to a pelletising feed containing chromite ore, at least one nickel salt, and silicon carbide as the only carbonaceous material and the only reducing agent. The invention also relates to process for manufacturing the pelletising feed comprising the steps providing chromite, at least one nickel salt and silicon carbide, and mixing chromite, at least one nickel salt and silicon carbide. The invention also relates to use of the pelletising feed as a starting material for the manufacture of sintering feed. The invention also relates to a sintering feed in the form of pellets containing the pelletising feed. The invention also relates to sintered pellets containing the sintering feed. The invention also relates to process for manufacturing the sintered pellets. The invention also relates to use of the sintered pellets as a component of smelting feed. The invention also relates to smelting feed comprising sintered pellets.
    Type: Application
    Filed: November 15, 2011
    Publication date: January 15, 2015
    Inventors: Helge Krogerus, Pasi Mäkelä
  • Publication number: 20150004049
    Abstract: Process for the manufacture of ferrochrome alloy comprising the steps of providing a pelletising feed, wherein the pelletising feed comprises chromite ore and silicon carbide as the only carbonaceous material and the only reducing agent; pelletising the pelletising feed to obtain pellets; sintering the pellets to obtain sintered pellets; mixing the sintered pellets with external reducing agent to obtain smelting feed; and smelting the smelting feed.
    Type: Application
    Filed: November 15, 2011
    Publication date: January 1, 2015
    Applicant: Outotec Oyj
    Inventors: Pasi Mäkelä, Helge Krogerus
  • Patent number: 8900511
    Abstract: The present invention relates a high-strength nonmagnetic stainless steel, containing, by weight percent, 0.01 to 0.06% of C, 0.10 to 0.50% of Si, 20.5 to 24.5% of Mn, 0.040% or less of P, 0.010% or less of S, 3.1 to 6.0% of Ni, 0.10 to 0.80% of Cu, 20.5 to 24.5% of Cr, 0.10 to 1.50% of Mo, 0.0010 to 0.0050% of B, 0.010% or less of O, 0.65 to 0.90% of N, and the remainder being Fe and inevitable impurities; the steel satisfying the following formulae (1) to (4): [Cr]+3.3×[Mo]+16×[N]?30??(1), {Ni}/{Cr}?0.15??(2), 2.0?[Ni]/[Mo]?30.0??(3), and [C]×1000/[Cr]?2.5??(4), wherein [Cr], [Mo], [N], [Ni], [Mo] and [C] represent the content of Cr, the content of Mo, the content of N, the content of Ni, the content of Mo and the content of C in the steel, respectively, and {Ni} represents the sum of [Ni], [Cu] and [N], and {Cr} represents the sum of [Cr] and [Mo]. The present invention further relates to a high-strength nonmagnetic stainless steel part containing the steel and a process for producing the same.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: December 2, 2014
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Koichi Ishikawa, Tetsuya Shimizu
  • Publication number: 20140334965
    Abstract: The present invention relates to an acidic aqueous solution suitable for the pickling of stainless steel grades that comprises accelerators based on water soluble inorganic compounds comprising at least one nitrogen atom in an oxidation state in the range of ?2 to ??. The present invention further encompasses a process for the pickling of stainless steel that makes use of a pickling solution comprising the above-mentioned accelerators.
    Type: Application
    Filed: July 29, 2014
    Publication date: November 13, 2014
    Inventors: Ioannis DEMERTZIS, Mauro RIGAMONTI, Paolo GIORDANI
  • Publication number: 20140308155
    Abstract: An efficient polishing method for polishing an alloy material to have an excellent mirror surface is provided. The alloy material contains a main component and 0.1% by mass or more of an element that has a Vickers hardness (HV) different from the Vickers hardness of the main component by 5 or more. A polishing composition used in the polishing method contains abrasive grains and an oxidant. The alloy material is preferably an aluminum alloy, a titanium alloy, a stainless steel, a nickel alloy, or a copper alloy. It is also preferable that the alloy material is subjected to preliminary polishing before being subjected to polishing in which the polishing composition is used.
    Type: Application
    Filed: November 19, 2012
    Publication date: October 16, 2014
    Inventors: Hitoshi Morinaga, Hiroshi Asano, Maiko Asai, Shogo Tsubota, Kazusei Tamai
  • Publication number: 20140294660
    Abstract: This hot-rolled ferritic stainless steel sheet contains, in terms of % by mass: 0.0150% or less of C, 0.01% to 2.00% of Si, 0.01% to 2.00% of Mn, less than 0.040% of P, 0.010% or less of S, 10.0% to 30.0% of Cr, 0.001% to 0.100% of Al, and 0.0200% or less of N, with a balance being Fe and unavoidable impurities, wherein in a cross section in a range of ¼ to ¾ of a sheet thickness, a length L of all crystal grain boundaries having orientation differences of 1° or more to less than 180° and a length La of subgrain boundaries having orientation differences of 1° or more to less than 15° satisfy a relation of La/L?0.20.
    Type: Application
    Filed: December 6, 2012
    Publication date: October 2, 2014
    Inventors: Ken Kimura, Junichi Hamada, Jun Takahashi, Yuuji Koyama, Shigeyuki Gotoh
  • Publication number: 20140216614
    Abstract: The present invention focuses on Sn and has as its problem to not only improve the corrosion resistance and rust resistance of Cr-containing ferritic stainless steel but also improve the ridging resistance. The present invention derives the relationship between Ap, which shows the ?-phase rate at 1100° C. due to a predetermined ingredient, and Sn in ferritic stainless steel which becomes a dual phase structure of ?+? in the hot rolling temperature region, applies and adds Sn, and hot rolls the steel to give a total rolling rate of 15% or more in 1100° C. or higher hot rolling to thereby obtain ferritic stainless steel sheet which has good ridging resistance, which also has excellent corrosion resistance and rust resistance, and which can be applied to general durable consumer goods: 0.060?Sn?0.634?0.
    Type: Application
    Filed: June 18, 2012
    Publication date: August 7, 2014
    Inventors: Masaharu Hatano, Eiichiro Ishimaru, Akihiko Takahashi, Ken Kimura, Shinichi Teraoka
  • Publication number: 20140131338
    Abstract: Various embodiments of a metal cored wires, hardband alloys, and methods are disclosed. In one embodiment of the present invention, a hardbanding wire comprises from about from about 16% to about 30% by weight chromium; from about 4% to about 10% by weight nickel; from about 0.05% to about 0.8% by weight nitrogen; from about 1% to about 4% by weight manganese; from about 1% to about 4% by weight carbon from about 0.5% to about 5% by weight molybdenum; from about 0.25% to about 2% by weight silicon; and the remainder is iron including trace elements. The hardband alloy produced by the metal cored wire meets API magnetic permeability specifications and has improved metal to metal, adhesive wear resistance compared to conventional hardband alloys.
    Type: Application
    Filed: November 12, 2013
    Publication date: May 15, 2014
    Applicant: Postle Industries, Inc.
    Inventor: Christopher J. Postle
  • Publication number: 20140119976
    Abstract: The present invention discloses zinc-modified ferritic stainless steels and a manufacturing method thereof. The chemical composition of the ferritic stainless steels comprises 14-16 wt % chromium, 0.001-4 wt % zinc, 0.001-0.02 wt % nitrogen, 0.003-0.015 wt % carbon and the remaining of weight percentage of the composition is iron. By adding zinc into the composition, the ferritic stainless steels of the present invention have stronger capacity of corrosion resistance and lower manufacturing cost, as compared to the conventional stainless steels.
    Type: Application
    Filed: January 29, 2013
    Publication date: May 1, 2014
    Applicant: NATIONAL TSING HUA UNIVERSITY
    Inventor: SWE-KAI CHEN
  • Patent number: 8673402
    Abstract: The present disclosure relates to a method of spray cladding a wear plate. The method may include melting an alloy including glass forming chemistry, pouring the alloy through a nozzle to form an alloy stream, forming droplets of the alloy stream, and forming a coating of the alloy on a base metal. The base plate may exhibit a first hardness H1 of Rc 55 or less and the alloy coated base plate may exhibit a hardness H2, wherein H2>H1. In addition, the coating may exhibit nanscale or near-nanscale microstructural features in the range of 0.1 nm to 1,000 nm. Furthermore, the alloy coated base plate may exhibit a toughness of greater than 60 ft-lbs.
    Type: Grant
    Filed: November 10, 2008
    Date of Patent: March 18, 2014
    Assignee: The NanoSteel Company, Inc.
    Inventor: Daniel James Branagan
  • Publication number: 20140069619
    Abstract: An aspect of a ferritic stainless steel contains, by mass %: C: 0.03% or less; N: 0.03% or less; Si: more than 0.1% to 1% or less; Mn: 0.02% to 1.2%; Cr: 15% to 23%; Al: 0.002% to 0.5%; and either one or both of Nb and Ti, with the remainder being Fe and unavoidable impurities, wherein Expression (1) and Expression (2) illustrated below are satisfied, an oxide film is formed on a surface thereof, and the oxide film contains Cr, Si, Nb, Ti and Al in a total cationic fraction of 30% or more, 8(C+N)+0.03?Nb+Ti?0.6??(1) Si+Cr+Al+{Nb+Ti?8(C+N)}?15.5??(2).
    Type: Application
    Filed: March 28, 2012
    Publication date: March 13, 2014
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Nobuhiko Hiraide, Fumio Fudanoki, Shunji Sakamoto
  • Patent number: 8663403
    Abstract: A precipitation-hardened stainless steel alloy comprises, by weight: about 14.0 to about 16.0 percent chromium; about 6.0 to about 8.0 percent nickel; about 1.25 to about 1.75 percent copper; greater than about 1.5 to about 2.0 percent molybdenum; about 0.001 to about 0.025 percent carbon; niobium in an amount greater than about twenty times that of carbon; and the balance iron and incidental impurities. The alloy has an aged microstructure and an ultimate tensile strength of at least about 1100 MPa and a Charpy V-notch toughness of at least about 69 J. In one embodiment, the aged microstructure includes martensite and not more than about 10% reverted austenite. In another embodiment, the alloy includes substantially all martensite and substantially no reverted austenite. The alloy is useful for making turbine airfoils.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: March 4, 2014
    Assignee: General Electric Company
    Inventors: Jianqiang Chen, Thomas Michael Moors, Jon Conrad Schaeffer
  • Publication number: 20140056751
    Abstract: An austenitic stainless cast steel having a volume fraction of a ferrite phase of 0.1-5.0%.
    Type: Application
    Filed: February 24, 2012
    Publication date: February 27, 2014
    Applicant: Kubota Corporation
    Inventors: Nobuyuki Sakamoto, Makoto Hineno
  • Publication number: 20130319583
    Abstract: The present invention provides a low-alloy high-purity ferritic stainless steel sheet provided with improved oxidation resistance and high-temperature strength by utilizing Sn addition in trace amounts without relying on excessive alloying of Al and Si which reduces fabricability and weldability or addition of rare elements such as Nb, Mo, W, and rare earths, and a process for producing the same. The high-purity ferritic stainless steel sheet includes C: 0.001 to 0.03%, Si: 0.01 to 2%, Mn: 0.01 to 1.5%, P: 0.005 to 0.05%, S: 0.0001 to 0.01%, Cr: 16 to 30%, N: 0.001 to 0.03%, Al: 0.05 to 3%, and Sn: 0.01 to 1% (% by mass), with the remainder being Fe and unavoidable impurities. A stainless steel slab having such steel components is heated, wherein an extraction temperature is 1100 to 1250° C., and a winding temperature after hot rolling is 650° C. or lower. A hot-rolled sheet is annealed at 900 to 1050° C., and cooled at 10° C./sec or less over a temperature range of 550 to 850° C.
    Type: Application
    Filed: January 23, 2012
    Publication date: December 5, 2013
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Masaharu Hatano, Eiichiro Ishimaru, Akihiko Takahashi
  • Publication number: 20130288074
    Abstract: This alloying element-saving hot rolled duplex stainless steel material contains, by mass %, C: 0.03% or less, Si: 0.05% to 1.0%, Mn: 0.5% to 7.0%, P: 0.05% or less, S: 0.010% or less, Ni: 0.1% to 5.0%, Cr: 18.0% to 25.0%, N: 0.05% to 0.30% and Al: 0.001% to 0.05%, with a remainder being Fe and inevitable impurities, wherein the alloying element-saving hot rolled duplex stainless steel material is produced by hot rolling, a chromium nitride precipitation temperature TN is in a range of 960° C. or lower, a yield strength is 50 MPa or more higher than that of a hot rolled steel material which is subjected to a solution heat treatment, and the alloying element-saving hot rolled duplex stainless steel material is as hot rolled state, and is not subjected to a solution heat treatment. This clad steel plate includes a duplex stainless steel as a cladding material, the duplex stainless steel has the above composition, and the chromium nitride precipitation temperature TN is in a range of 800° C. to 970° C.
    Type: Application
    Filed: January 26, 2012
    Publication date: October 31, 2013
    Inventors: Shinji Tsuge, Yuusuke Oikawa, Yoichi Yamamoto, Haruhiko Kajimura, Kazuhiko Ishida
  • Patent number: 8500923
    Abstract: The present invention provides a stainless steel as a metal base material for a weight sensor substrate of an automobile airbag. The stainless steel sheet contains a high aluminiferous ferritic stainless steel containing, in mass, Al of 2.5 to 8%, C: 0.025% or less, N: 0.025% or less, the sum of C and N being 0.030% or less, and Nb: 0.05 to 0.5%, with the balance Fe and unavoidable impurities. Said stainless steel sheet may further contain, in mass, one or more of V: 0.05 to 0.4%, Ti: 0.02 to 0.2%, and Zr: 0.02 to 0.2%. The present invention controls the difference in the average linear expansion coefficient between said stainless steel sheet and crystallized glass for said weight sensor to less than 10% in the temperature range from 20° C. to 900° C. and thus to improve the adhesiveness of said stainless steel sheet with said crystallized glass.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: August 6, 2013
    Assignee: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Masuhiro Fukaya, Tadashi Komori
  • Publication number: 20130176098
    Abstract: A magnetic material constituted by a grain compact 1 obtained by shaping metal grains 11 and then heat-treating them in an oxidizing ambience, wherein the metal grains 11 are made of a Fe—Cr—Si alloy and their FeMetal/(FeMetal+FeOxide) ratio as measured before shaping by XPS, with respect to the sum of integral values at the peaks of 709.6 eV, 710.7 eV and 710.9 eV, or FeOxide, and peak integral value at 706.9 eV, or FeMetal, is 0.2 or more.
    Type: Application
    Filed: July 11, 2012
    Publication date: July 11, 2013
    Applicant: TAIYO YUDEN CO., LTD.
    Inventors: Hitoshi MATSUURA, Hideki OGAWA, Atsushi TANADA, Kiyoshi TANAKA, Kenji OTAKE
  • Publication number: 20130122320
    Abstract: A martensitic stainless steel for use in tableware, knives, scissors and the like, containing in % by weight, 0.10 to 0.50% carbon and 11 to 16% chromium, and a production method therefore.
    Type: Application
    Filed: December 20, 2010
    Publication date: May 16, 2013
    Applicant: POSCO
    Inventors: Dong-Chul Chae, Jong-Heon Seok, Joon-In Kwon, Byoung-Jun Song, Ki-Hoon Jo, Mi-Nam Park
  • Publication number: 20130068449
    Abstract: A hardfacing composition composed of an Fe—Cr alloy. The alloy is comprised of 80 wt % iron, about 2 wt % to about 20 wt % Cr, less than 1 wt % Si and less than 1 wt % C. The alloy's microstructure is at least 80 vol % martensite; and less than 20 vol % austenite.
    Type: Application
    Filed: September 16, 2011
    Publication date: March 21, 2013
    Applicant: NATIONAL OILWELL VARCO,LP.
    Inventors: Raju PILLAI, Jiinjen A. SUE, Parul W. DHALL
  • Publication number: 20130039796
    Abstract: A master alloy used to produce the steel part and a process for producing a sinter hardened steel part from the master alloy are described. The powdered master alloy having a composition of iron, about 1 to less than 5 weight % C, about 3 to less than 15 weight % Mn, and about 3 to less than 15 weight % Cr, wherein the master alloy comprises a microstructure composed of a solid solution of the alloying elements and carbon, the microstructure comprising at least 10 volume % austenite and the remainder as iron compounds. The process comprises: preparing the master alloy, mixing the master alloy with a steel powder to produce a mixture wherein the weight % of the master alloy is from 5 to 35 weight % of the mixture, compacting the mixture into a shape of a part and sintering the mixture to produce the steel part, and controlling the cooling rate after sintering to produce sinter hardening. The master alloy powder can also be used as a sinter hardening enhancer when mixed with low-alloy steel powders.
    Type: Application
    Filed: February 15, 2011
    Publication date: February 14, 2013
    Inventors: Gilles L'Esperance, Ian Bailon-Poujol, Denis Christopherson, JR.
  • Publication number: 20130039801
    Abstract: This martensitic stainless steel contains, in terms of percent by mass: C: 0.003% to 0.03%; Si: 0.01% to 1.0%; Mn: 3.0% to 6.0%; P: 0.05% or less; S: 0.003% or less; Ni: 1.0% to 3.0%; Cr: 15.0% to 18.0%; Mo: 0% to 1.0%; Cu: 0% to 2.0%; Ti: 0% to 0.05%; N: 0.05% or less; Al: 0.001% to 0.1%; and O: 0.005% or less, with a remainder being Fe and inevitable impurities, wherein a total amount of C and N is in a range of 0.060% or less, ?max represented by the formula 1 is in a range of 80 or more, and ?pot represented by the formula 2 is in a range of 60 to 90. ?max=420×C %+470×N %+23×Ni %+9×Cu %+7×Mn %?11.5×Cr %?11.5×Si %?52×Al %+189??Formula 1 ?pot=700×C %+800×N %+10×(Mn %+Cu %)+20×Ni %?9.3×Si %?6.2×Cr %?9.3×Mo %?74.4×Ti %?37.2×Al %+63.2??Formula 2 Here, C %, N %, Ni %, Cu %, Mn %, Cr %, Si %, A1%, Mo %, and Ti % represent the contents (mass %) of the respective elements.
    Type: Application
    Filed: March 9, 2011
    Publication date: February 14, 2013
    Inventors: Shinji Tsuge, Haruhiko Kajimura, Hiroshige Inoue
  • Publication number: 20130022488
    Abstract: An iron (Fe)-based austenitic heat-resistant cast steel includes, based on a total of 100 mass % (indicated below simply as “%”): 0.4 to 0.8% of carbon (C), 3.0% or less of silicon (Si), 0.5 to 2.0% of manganese (Mn), 0.05% or less of phosphorus (P), 0.03 to 0.2% of sulfur (S), 18 to 23% of chromium (Cr), 3.0 to 8.0% of nickel (Ni) and 0.05 to 0.4% of nitrogen (N). A ratio of chromium (Cr) to carbon (C) is in a range of 22.5?Cr/C?57.5. The cast steel includes one or two or more of vanadium (V), molybdenum (Mo), tungsten (W) and niobium (Nb) in a total amount of less than 0.2%.
    Type: Application
    Filed: April 5, 2011
    Publication date: January 24, 2013
    Applicants: AISIN TAKAOKA CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshikazu Genma, Go Kuramoto, Zhong-zhi Zhang
  • Patent number: 8357328
    Abstract: A formed article comprising a nanostructured ferritic alloy is provided. Advantageously, the article is not formed via extrusion, and thus, cost savings are provided. Methods are also provided for forming the article, and the articles so produced, exhibit sufficient continuous cycle fatigue crack growth resistance and hold time fatigue crack growth resistance to be utilized as turbomachinery components, and in particular, large, hot section components of a gas or steam turbine engines. In other embodiments, a turbomachinery component comprising an NFA is provided, and in some such embodiments, the turbomachinery component may be extruded.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: January 22, 2013
    Assignee: General Electric Company
    Inventors: Richard Didomizio, Matthew Joseph Alinger, Raymond Joseph Stonitsch, Samuel Vinod Thamboo
  • Patent number: 8357247
    Abstract: A martensitic stainless steel, having high temper softening resistance, for disc brakes is provided. The martensitic stainless steel is not seriously softened by maintaining the steel at more than 600° C. The steel has a hardness of 32 or more or a hardness of 30 or more in HRC after the steel is tempered at 650° C. for one hour or tempered at 670° C. for one hour, respectively. In particular, the martensitic stainless steel for disc brakes contains less than 0.050 mass % carbon, 1.0 mass % or less silicon, 2.0 mass % or less manganese, 0.04 mass % or less phosphorus, 0.010 mass % or less sulfur, 0.2 mass % or less aluminum, more than 11.5 mass % to 15.0 mass % chromium, 0.5 mass % to 2.0 mass % nickel, more than 0.50 mass % to 4.0 mass %. copper, more than 0.08 mass % to 0.6 mass % niobium, and less than 0.09 mass % nitrogen, the remainder being iron and unavoidable impurities.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: January 22, 2013
    Assignee: JFE Steel Corporation
    Inventors: Junichiro Hirasawa, Yoshihiro Ozaki, Takumi Ujiro, Osamu Furukimi
  • Publication number: 20120321501
    Abstract: The present invention relates to a production method for high-carbon martensitic stainless steel as used in razorblades, knives and the like, which contains, as percentages by weight, 0.40 to 0.80% carbon and 11 to 16% chromium as main components. Provided is a production method for high-carbon martensitic stainless steel in a strip-casting device, wherein a stainless-steel thin sheet is cast by supplying a stainless molten steel containing, as percentages by weight, 0.40 to 0.80% carbon and from 11 to 16% chromium to a molten steel pool from a tundish via a nozzle, and the cast stainless-steel thin sheet is made into a hot-rolled annealed strip using in-line rollers to a rolling reduction of 5 to 40% immediately just after the casting so that the size of primary carbides within the microstructure of the hot-rolled annealed strip is 10 ?m or less, and also provided is martensitic stainless steel produced by means of the production method.
    Type: Application
    Filed: December 20, 2010
    Publication date: December 20, 2012
    Applicant: POSCO
    Inventors: Dong-Chul Chae, Bo-Sung Seo, Seung-Bae Ahn, Seong-In Jeong, Jae-Hwa Lee, Gyu-Jin Jo
  • Patent number: 8303168
    Abstract: A device has a magnetically shielded component that is magnetically shielded from an external magnetic field, and a housing. The housing is made from a ferritic stainless steel that has an austenitized surface layer rendered on the surface, and an internal layer portion having an internal ferrite phase that functions as a magnetic shield for the magnetically shielded component.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: November 6, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Koki Takasawa
  • Publication number: 20120273092
    Abstract: A method of manufacturing a hot press-hardened component comprises the following production steps: a) providing a steel product produced at least in sections from a stainless steel comprising of the following composition (specified in % wt.) C: 0.010-1.200%, P: up to 0.1%, S: up to 0.1%, Si: 0.10-1.5%, Cr: 10.5-20.0% and optionally one or more elements from the group “Mn, Mo, Ni, Cu, N, Ti, Nb, B, V, Al, Ca, As, Sn, Sb, Pb, Bi, H” with the requirement Mn: 0.10-3.0%, Mo: 0.05-2.50%, Ni: 0.05-8.50%, Cu: 0.050-3.00%, N: 0.01-0.2%, Ti: up to 0.02%, Nb: up to 0.1%, B: up to 0.1%, V: up to 0.2%, Al: 0.001-1.50%, Ca: 0.0005-0.003%, As: 0.003-0.015%, Sn: 0.003-0.01%, Sb: 0.002-0.01%, Pb: up to 0.01%, Bi: up to 0.01%, H: up to 0.
    Type: Application
    Filed: June 17, 2010
    Publication date: November 1, 2012
    Applicant: THYSSENKRUPP NIROSTA GMBH
    Inventor: Evelin Ratte
  • Patent number: 8287403
    Abstract: An iron-based alloy for a golf club head includes: chromium in an amount ranging from 16.3 to 17.2 wt %; nickel in an amount ranging from 5.8 to 6.5 wt %; nitrogen in an amount ranging from 0.10 to 0.20 wt %; carbon in an amount ranging from 0.01 to 0.12 wt %; silicon in an amount ranging from 0.3 to 1.2 wt %; manganese in an amount ranging from 0.3 to 1.2 wt %; and a balance of iron and impurities, based on a total weight of the iron-based alloy. The alloy has a duplex-phase microstructure including a martensite phase and 10 to 30 percent austenite phase, and has a tensile strength greater than 120 Ksi and an elongation greater than 35%.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: October 16, 2012
    Assignee: O-Ta Precision Industry Co., Ltd.
    Inventors: Chih-Yeh Chao, Chuan-Hsien Chang, Jui-Ming Su
  • Publication number: 20120237387
    Abstract: The disclosure mainly relates to a stainless steel sheet containing a minimum of 10.5% by weight of Cr and a maximum of 1.2% by weight of C, the microstructure of which is martensitic or austeno-martensitic and comprises at least 2% by volume of martensite, essentially characterized in that it comprises at least one local portion of lesser mechanical resistance, having a martensitic content at least 10% lower than that of the remainder of said sheet; said local portion being at least partly with a thickness equal to that of said sheet. The disclosure also relates to a method for manufacturing this steel sheet and to a steel part which may be obtained by deformation of this sheet.
    Type: Application
    Filed: September 21, 2009
    Publication date: September 20, 2012
    Applicant: APERAM
    Inventors: Pierre-Olivier Santacreu, Aurelien Pic, Fabrice Pinard
  • Patent number: 8262815
    Abstract: The present invention provides high purity ferrite stainless steel able to reduce deterioration in surface conditions due to pitting corrosion or rusting or other corrosion to an extent no different from SUS304 or better without inviting a drop in manufacturability or workability and without relying on the addition of rare elements, and a method of production of the same, that is, ferritic stainless steel containing, by mass %, C: 0.01% or less, Si: 0.01 to 0.20%, Mn: 0.01 to 0.30%, P: 0.04% or less, S: 0.01% or less, Cr: 13 to 22%, N: 0.001 to 0.020%, Ti: 0.05 to 0.35%, Al: 0.005 to 0.050%, Sn: 0.001 to 1%, and a balance of Fe and unavoidable impurities to which Sn is added to modify the passive film and improve the corrosion resistance. To improve the effect of modification of the passive film by the addition of Sn, after the final annealing, the steel is held in the 200 to 700° C. temperature range for 1 minute or more.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: September 11, 2012
    Assignee: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Masaharu Hatano, Akihiko Takahashi
  • Publication number: 20120160363
    Abstract: Provided are high manganese containing ferrous based components and their use in oil, gas and/or petrochemical applications. In one form, the components include 5 to 40 wt % manganese, 0.01 to 3.0 wt % carbon and the balance iron. The components may optionally include one or more alloying elements chosen from chromium, nickel, cobalt, molybdenum, niobium, copper, titanium, vanadium, nitrogen, boron and combinations thereof.
    Type: Application
    Filed: December 21, 2011
    Publication date: June 28, 2012
    Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY
    Inventors: Hyun Woo Jin, Raghavan Ayer, Douglas Paul Fairchild, Mario L. Macia
  • Patent number: 8202375
    Abstract: A description is given of a temperature-stable cast-iron alloy having high wear resistance at temperatures between 500 and 900° C. The alloy is characterized in that it has the following composition expressed in weight percentages: chromium: 15.0-20.0%, carbon: 1.0-2.0%, manganese: 0.8-1.2%, silicon: 1.2-1.5%, nickel: 1.5-2.5%, balance iron and unavoidable metallic and non-metallic contaminants where the non-metallic contaminants comprise nitrogen, oxygen, phosphorous and sulphur. Hereby is obtained a cast-iron alloy which has a higher wear resistance and a reduced tendency to form the undesirable sigma phase when heated to temperatures between 500 and 900° C. as compared to the known allows.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: June 19, 2012
    Assignee: FLSMIDTH A/S
    Inventors: Asger Karlsson, Rasmus Kirkegaard Stage
  • Publication number: 20120120561
    Abstract: The hinge in accordance with the present invention is made with a metal injection molding process from an alloy having at least: from 4 to 32 wt % Mn, from 16 to 37 wt % Cr and Fe that fills up the rest percentage.
    Type: Application
    Filed: November 17, 2010
    Publication date: May 17, 2012
    Applicant: SHIN ZU SHING CO., LTD.
    Inventors: Yu-Chi LU, Yu-Chan HSIEH, SHUN-TIAN LIN
  • Publication number: 20120121451
    Abstract: An arc spray coating that is superior in both wear resistance and machinability, method of forming same, an arc spray wire used to form such a coating, and a cylinder block on whose bore inner surface is formed such an arc spray coating are provided. To this end, the arc spray coating contains Fe as a main component, 0.01% to 0.15% by weight of C, and at least 0.12% by weight of N, and the arc spray wire (wire) contains Fe as a main component, 0.01% to 0.2% by weight of C, and 0.25% to 1.7% by weight of Si, and may further contain at least 11% by weight of Cr as another embodiment.
    Type: Application
    Filed: January 25, 2012
    Publication date: May 17, 2012
    Inventors: Kota Kodama, Noritaka Miyamoto
  • Patent number: 8158057
    Abstract: Various embodiments relate to interconnects for solid oxide fuel cells (“SOFCs”) comprising ferritic stainless steel and having at least one via that when subjected to an oxidizing atmosphere at an elevated temperature develops a scale comprising a manganese-chromate spinel on at least a portion of a surface thereof, and at least one gas flow channel that when subjected to an oxidizing atmosphere at an elevated temperature develops an aluminum-rich oxide scale on at least a portion of a surface thereof. Other embodiments relate to interconnects comprising a ferritic stainless steel and having a fuel side comprising metallic material that resists oxidation during operation of the SOFCs, and optionally include a nickel-base superalloy on the oxidant side thereof. Still other embodiments relate to ferritic stainless steels adapted for use as interconnects comprising ?0.1 weight percent aluminum and/or silicon, and >1 up to 2 weight percent manganese. Methods of making interconnects are also disclosed.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: April 17, 2012
    Assignee: ATI Properties, Inc.
    Inventor: James M. Rakowski
  • Patent number: 8157930
    Abstract: A martensitic stainless steel comprising C: 0.01-0.10%, Si: 0.05-1.0%, Mn: 0.05-1.5%, P: not more than 0.03%, S: not more than 0.01%, Cr: 9-15%, Ni: 0.1-4.5%, Al: not more than 0.05% and N: not more than 0.1% in mass %, and further comprising at least one of Cu: 0.05-5% and Mo: 0.05-5%, the residual being Fe and impurities, is provided, wherein the contents of Cu and Mo satisfy the following formula (a) or (b), 0.2%?Mo+Cu/4?5%??(a) 0.55%?Mo+Cu/4?5%??(b) and wherein the hardness is 30-45 in HRC and the carbide amount in grain boundaries of the prior austenite is not more than 0.5 volume %. The marensitic stainless steel has excellent properties regarding the sulfide stress cracking resistance, the resistance to corrosive wear and the localized corrosion.
    Type: Grant
    Filed: March 12, 2004
    Date of Patent: April 17, 2012
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Hisashi Amaya, Kunio Kondo, Masakatsu Ueda, Keiichi Nakamura, Takahiro Kushida, Kazuyo Kushida, legal representative
  • Patent number: 8062584
    Abstract: The present invention provides, as a material superior in heat resistance in a hot environment where the maximum temperature of the exhaust gas becomes 750 to 900° C., ferritic stainless steel sheet superior in heat resistance in a broad temperature region of 750 to 900° C. with long term stability by a smaller amount of addition of Mo than SUS444 containing about 2% of expensive Mo, that is, ferritic stainless steel sheet superior in heat resistance characterized by containing, by mass %, C: 0.01% or less, N: 0.02% or less, Si: 0.05 to 1%, Mn: 0.1 to 2%, Cr: 10 to 30%, Mo: 0.1 to 1%, Cu: 1 to 2%, Nb: 0.2 to 0.7%, Ti: 0.01 to 0.3%, and B: 0.0002 to 0.0050%, having a balance of Fe and unavoidable impurities, and having a 0.2% yield strength at 750° C. of 70 MPa or more.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: November 22, 2011
    Assignee: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Junichi Hamada, Haruhiko Kajimura, Toshio Tanoue, Fumio Fudanoki, Yoshiharu Inoue
  • Publication number: 20110192127
    Abstract: A filter comprising a porous sintered stainless steel is provided. The filter includes 10-30% chromium, 5-25% nickel, 0.5-3% manganese; 1-4% silicon, and 0-3% molybdenum with the remainder being iron and inevitable impurities. The sintered steel has a density less than 80% of full density. The use of a stainless steel powder for the preparation of a filter having improved permeability at high temperatures also is described.
    Type: Application
    Filed: April 20, 2011
    Publication date: August 11, 2011
    Applicant: HÖGANÄS AB
    Inventors: Owe Mårs, Ingrid Hauer
  • Patent number: 7985306
    Abstract: A precipitation-hardened stainless steel alloy comprises, by weight: about 14.0 to about 16.0 percent chromium; about 6.0 to about 7.0 percent nickel; about 1.25 to about 1.75 percent copper; about 0.5 to about 2.0 percent molybdenum; about 0.025 to about 0.05 percent carbon; niobium in an amount greater than about twenty times to about twenty-five times that of carbon; and the balance iron and incidental impurities. The alloy has an aged microstructure and an ultimate tensile strength of at least about 1100 MPa and a Charpy V-notch toughness of at least about 69 J. The aged microstructure includes martensite and not more than about 10% reverted austenite and is useful for making turbine airfoils.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: July 26, 2011
    Assignee: General Electric Company
    Inventors: Jianqiang Chen, Thomas Michael Moors, Jon Conrad Schaeffer
  • Publication number: 20110172783
    Abstract: The invention relates to a single-piece metal strip having no weld seams and made of a polycrystalline metal, comprising at least one region in which the crystallites have a comparatively stronger anisotropic orientation, and at least one region in which the crystallites have a comparatively less strong anisotropic orientation, and wherein 0-20 X-ray diffractograms measured at two arbitrary points of the strip by way of CuKalpha radiation produce no statistically significant differences with respect to the position and shape of the respectively corresponding pikes, and to tweezers, supporting implants, and joint prostheses comprising said metal strip. The invention further relates to a roll method for obtaining said metal strip.
    Type: Application
    Filed: January 28, 2009
    Publication date: July 14, 2011
    Applicant: DUMONT SWITZERLAND AG
    Inventor: Anton Walliser
  • Publication number: 20110064601
    Abstract: The invention relates to a stainless steel product, particularly to a duplex stainless steel casting with high machinability, to the use of the product and to the method to produce the product. The product contains in weight percent up to 0.07% carbon, up to 2% silicon, 3-8% manganese, 19-23% chromium, 0.5-1.7% nickel, up to 1% of molybdenum and/or tungsten with the formula (Mo+½W) less than 1%, up to 1% copper and 0.15-0.30% nitrogen, the remainder being iron and incidental impurities.
    Type: Application
    Filed: May 14, 2009
    Publication date: March 17, 2011
    Applicant: OUTOKUMPU OYJ
    Inventors: Mats Liljas, Jan Olsson, Peter Samuelsson, Mikael willför