Titanium, Zirconium Or Hafnium Containing Patents (Class 420/68)
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Patent number: 7445750Abstract: The invention relates to a tool steel, the composition of which comprises (the percentages being expressed in % by weight): 0.8 ? C ? 1.5 5.0 ? Cr ? 14 0.2 ? Mn ? 3 Ni ? 5 V ? 1 Nb ? 0.1 Si + Al ? 2 Cu ? 1 S ? 0.3 Ca ? 0.1 Se ? 0.1 Te ? 0.1 1.0 ? Mo + ½W ? 4 0.06 ? Ti + ½Zr ? 0.15 0.004 ? N ? 0.02 the balance of the composition consisting of iron and impurities resulting from the smelting, it being furthermore understood that: 2.5×10?4%2?(Ti+½Zr)×N, to a process for manufacturing parts made in this steel and to the parts obtained.Type: GrantFiled: April 16, 2002Date of Patent: November 4, 2008Assignee: USINORInventors: Jean Beguinot, Dominique Viale
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Publication number: 20080118388Abstract: The use of a steel alloy for the production of fittings, particularly screw- or push-fit fitting, valves or compression joints as well as corresponding fittings, particularly screw- or push-fit fittings, valves or compression joints for fluid or drinking water ducting systems is described. Low-cost production of fittings, valves and compression joints at the same time with improved corrosion resistance is achieved by the use of a steel alloy, which beside iron has the following content of alloying constituents in weight percent: C?0.05%, 11%?Cr?25%, Ni<5%, Mn?2%, N?0.25%.Type: ApplicationFiled: November 16, 2007Publication date: May 22, 2008Inventors: Peter Arens, Christian Rischen, Frank Kasperkowiak, Patrik Zeiter
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Patent number: 7297214Abstract: Provided is free cutting alloy excellent in machinability, preserving various characteristics as alloy. The free cutting alloy contains: one or more of Ti and Zr as a metal element component; and C being an indispensable element as a bonding component with the metal element component, wherein a (Ti,Zr) based compound including one or more of S, Se and Te is formed in a matrix metal phase. The free cutting alloy is more excellent in machinability, preserving various characteristics as alloy at similar levels to a conventional case. The effect is especially conspicuous, for example, when a compound expressed in a chemical form of (Ti,Zr)4C2(S,Se,Te)2 as the (Ti,Zr) based compound is formed at least in a dispersed state in the alloy structure.Type: GrantFiled: May 18, 2004Date of Patent: November 20, 2007Assignees: Daido Tokushuko Kabushiki Kaisha, Tohoku Tokushuko Kabushiki Kaisha, Japan Industrial Technology Association, Tohoku Technoarch Co., Ltd.Inventors: Kiyohito Ishida, Katsunari Oikawa, Takashi Ebata, Takayuki Inoguchi, Tetsuya Shimizu, Michio Okabe
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Patent number: 6921440Abstract: A process for production of sheet-metal strip of niobium-stabilized 14% chromium ferritic steel, characterized in that certain steel is subjected to: cold rolling of the hot sheet metal with or without preliminary annealing, final annealing of the sheet-metal strip at a temperature of between 800° C. and 1100° C. for a duration of between 1 minute and 5 minutes and preferably at a temperature of about 1050° C. for a time of about 2 minutes. Steel and exhaust manifold.Type: GrantFiled: March 14, 2002Date of Patent: July 26, 2005Assignee: Ugine SAInventors: Silke Liesert, Laurent Antoni, Pierre Olivier Santacreu
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Patent number: 6824672Abstract: An austenitic stainless steel with a composition comprising: at most 0.15% of C; 2% to 10% of Mn; at most 2% of Ni; at most 4% of Cu; 0.1% to 0.4% of N; 10% to 20% of Cr; at most 1% of Si; at most 3% of Mo; and at most 0.7% of Ti; is used to manufacture equipment, for example furnaces, reactors or ducts, or elements of this equipment, or to coat the internal walls of this equipment, said equipment being used to implement petrochemical processes conducted at temperatures of 350° C. to 1100° C. and in which coke can be formed.Type: GrantFiled: January 15, 2002Date of Patent: November 30, 2004Assignees: Institute Francais du Petrole, USINORInventors: Philippe Lecour, Xavier Longaygue, François Ropital, Laurent Antoni
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Patent number: 6793744Abstract: The present invention relates to a martensitic stainless steel that can be used in manufacturing articles such as a shaft or an impeller which require high mechanical strength and corrosion resistance and provides a martensitic stainless steel comprising less than 0.06 wt. % C, less than 2.5 wt. % Si, less than 2.5 wt. % Mn, 1.0-6.0 wt. % Ni, 10.0-19.0 wt. % Cr, 0.5-6.0 wt. % W, less than 3.5 wt. % Mo, less than 0.5 wt. % Nb, less than 0.5 wt. % V, less than 3.0 wt. % Cu, 0.05-0.25 wt. % N, and the remainder being Fe and minor impurities.Type: GrantFiled: November 15, 2000Date of Patent: September 21, 2004Assignee: Research Institute of Industrial Science & TechnologyInventor: Jae-Young Jung
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Patent number: 6786981Abstract: A ferritic stainless steel sheet for fuel tanks and fuel pipes comprises, by mass percent, about 0.1% or less of C; about 1.0% or less of Si; about 1.5% or less of Mn; about 0.06% or less of P; about 0.03% or less of S; about 1.0% or less of Al; about 11% to about 20% Cr; about 2.0% or less of Ni; about 0.5% to about 3.0% Mo; about 0.02% to about 1.0% V; about 0.04% or less of N; at least one of about 0.01% to about 0.8% Nb and about 0.01% to about 1.0% Ti; and the balance being Fe and incidental impurities. The ferritic stainless steel sheet is produced by rough-rolling a slab having the above composition; hot-rolling the rough-rolled sheet under a linear pressure of at least about 3.5 MN/m at a final pass in the finish rolling; cold-rolling the hot-rolled sheet at a gross reduction rate of at least about 75%; and annealing the cold-rolled sheet. The cold-rolling step includes one rolling stage or at least two rolling stages including intermediate annealing.Type: GrantFiled: December 11, 2001Date of Patent: September 7, 2004Assignee: JFE Steel CorporationInventors: Yoshihiro Yazawa, Mineo Muraki, Yoshihiro Ozaki, Kunio Fukuda, Atushi Miyazaki, Yasushi Katoh
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Publication number: 20040159380Abstract: A ferritic stainless steel sheet for use in automobile fuel tanks and fuel pipes having smooth surface and resistance to organic acid is provided. The sheet contains, by mass, not more than about 0.1% C, not more than about 1.0 Si, not more than about 1.5% Mn, not more than about 0.06% P, not more than about 0.03% S, about 11% to about 23% Cr, not more than about 2.0% Ni, about 0.5% to about 3.0% Mo, not more than about 1.0% Al, not more than about 0.04% N, at least one of not more than about 0.8% Nb and not more than about 1.0% Ti, and the balance being Fe and unavoidable impurities, satisfying the relationship: 18≦Nb/(C+N)+2Ti/(C+N)≦60, wherein C, N, Nb, and Ti in the relationship represent the C, N, Nb, and Ti contents by mass percent, respectively. A process for making the same is also provided.Type: ApplicationFiled: February 17, 2004Publication date: August 19, 2004Applicant: JFE Steel CorporationInventors: Yoshihiro Yazawa, Osamu Furukimi, Mineo Muraki, Yoshihiro Ozaki, Kunio Fukuda, Yukihiro Baba
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Patent number: 6770243Abstract: A chromium steel alloy having 0.4 to 0.75% of carbon, 0.4 to 1.6% of manganese, 12 to 19% of chromium, up to 0.2% of nickel, up to 0.7% of silicon, 0.5 to 1.5% of molybdenum, up to 1.5% of tungsten, 0.05 to 0.3% of vanadium and (% Ti/% Nb), 0.02 to 0.15% of sulfur, up to 0.1% of nitrogen and up to 0.008% of boron, remainder iron including smelting-related impurities. This steel alloy is distinguished by good processability, resistance to corrosion, resistance to abrasion, a high resistance to heat up to 300° C. and above, and a high rigidity.Type: GrantFiled: July 17, 2002Date of Patent: August 3, 2004Assignee: Stahlwerk Ergste Westig GmbHInventors: Gisbert Kloss-Ulitzka, Gunter Schnabel, Oskar Pacher
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Publication number: 20040094240Abstract: A ferritic stainless steel sheet for fuel tanks and fuel pipes comprises, by mass percent, about 0.1% or less of C; about 1.0% or less of Si; about 1.5% or less of Mn; about 0.06% or less of P; about 0.03% or less of S; about 1.0% or less of Al; about 11% to about 20% Cr; about 2.0% or less of Ni; about 0.5% to about 3.0% Mo; about 0.02% to about 1.0% V; about 0.04% or less of N; at least one of about 0.01% to about 0.8% Nb and about 0.01% to about 1.0% Ti; and the balance being Fe and incidental impurities. The ferritic stainless steel sheet is produced by rough-rolling a slab having the above composition; hot-rolling the rough-rolled sheet under a linear pressure of at least about 3.5 MN/m at a final pass in the finish rolling; cold-rolling the hot-rolled sheet at a gross reduction rate of at least about 75%; and annealing the cold-rolled sheet. The cold-rolling step includes one rolling stage or at least two rolling stages including intermediate annealing.Type: ApplicationFiled: November 17, 2003Publication date: May 20, 2004Applicant: JFE Steel Corporation, a corporation of JapanInventors: Yoshihiro Yazawa, Mineo Muraki, Yoshihiro Ozaki, Kunio Fukuda, Atsushi Miyazaki, Yasushi Katoh
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Patent number: 6641780Abstract: A ferritic stainless steel having improved high temperature mechanical properties includes greater than 25 weight percent chromium, 0.75 up to 1.5 weight percent molybdenum, up to 0.05 weight percent carbon, and at least one of niobium, titanium, and tantalum, wherein the sum of the weight percentages of niobium, titanium, and tantalum satisfies the following equation: 0.4≦(%Nb+%Ti+½(%Ta))≦1. The coefficient: of thermal expansion of the ferritic stainless steel is within 25 percent of the CTE of stabilized zirconia between 20° C. (68° F.) and 1000° C. (1832° F.), and the steel exhibits at least one creep property selected from creep rupture strength of at least 1000 psi at 900° C. (1,652° F.), time to 1% creep strain of at least 100 hours at 900° C. (1652° F.) under load of 1000 psi, and time to 2% creep strain of at least 200 hours at 900° C. (1652° F.) Under load of 1000 psi.Type: GrantFiled: November 30, 2001Date of Patent: November 4, 2003Assignee: ATI Properties Inc.Inventor: John F. Grubb
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Publication number: 20030127163Abstract: The invention provides a ferritic heat-resistant steel having excellent high-temperature oxidation resistance, especially excellent steam oxidation-resistant characteristics. In high-Cr ferritic heat-resistant steel, ultra-fine oxide particles having a size of not larger than 1 &mgr;m are formed just below the oxide films and formed on the steel base, whereby the adhesiveness between the films and the base is enhanced. The ferritic heat-resistant steel contains Cr in an amount of from 8.0 to 13.0% by weight, and at least one of Rh and Ir in a total amount of from 0.3 to 5.0% by weight.Type: ApplicationFiled: July 22, 2002Publication date: July 10, 2003Inventors: Nobuyuki Fujitsuna, Fujio Abe, Takehiko Itagaki, Masaaki Igarashi, Seiichi Muneki, Kazuhiro Kimura, Hideaki Kushima
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Publication number: 20030124019Abstract: A ferritic stainless steel having improved high temperature mechanical properties includes greater than 25 weight percent chromium, 0.75 up to 1.5 weight percent molybdenum, up to 0.Type: ApplicationFiled: November 30, 2001Publication date: July 3, 2003Inventor: John F. Grubb
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Patent number: 6562293Abstract: An article of equipment intended to be submerged in molten zinc and low percentage aluminum/zinc melts, said article containing an alloy material comprised of carbon, chromium, nickel, tungsten, molybdenum, vanadium, niobium (columbium), cobalt, boron, iron and/or zirconium, wherein vanadium is present in an amount sufficient to limit the &ggr;-region.Type: GrantFiled: November 6, 2000Date of Patent: May 13, 2003Assignee: Alphatech, Inc.Inventor: Jorge A. Morando
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Patent number: 6475642Abstract: An oxidation-resistant coating is described, formed of an alloy containing: about 40 to about 50 atom % aluminum and about 0.5 atom % to about 3 atom % tantalum; with a balance of nickel; cobalt, iron, or combinations thereof. The coating may also include chromium and a precious metal, as well as other components, such as zirconium or molybdenum. A method for applying the oxidation-resistant coating to a substrate is also described. The substrate can be formed of superalloy material, e.g., a turbine engine component. Related articles are also disclosed.Type: GrantFiled: August 31, 2000Date of Patent: November 5, 2002Assignee: General Electric CompanyInventors: Ji-Cheng Zhao, Melvin Robert Jackson, Ramgopal Darolia
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Publication number: 20020012602Abstract: The present invention provides: a fuel tank made of a ferritic stainless steel sheet having long lasting corrosion resistance under the environment of the fuel tank and excellent in formability when fabricating the fuel tank; more specifically, a fuel tank made of a ferritic stainless steel sheet containing 10 to 25 mass % of Cr and having an average r-value of 1.9 or larger, an r-value in-plane anisotropy &Dgr;r of 1.0 or smaller, and a total elongation of 30% or larger, having a plane intensity ratio I(111)/I(100) of 10 or larger, and having lubricant films on the surfaces of the steel sheet and a surface friction coefficient of 0.10 or less.Type: ApplicationFiled: August 6, 2001Publication date: January 31, 2002Inventors: Akihiko Takahashi, Shunji Sakamoto, Yuji Koyama, Katsuhiko Kato, Tadashi Komori, Naoto Ono, Masayuki Abe
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Patent number: 6214289Abstract: A body centered cubic and a highly oxidation and corrosive resistant Fe—Cr—Si-alloy.Type: GrantFiled: September 16, 1999Date of Patent: April 10, 2001Assignee: U. T. BattelleInventors: Vinod K. Sikka, Joseph Vought, C. Randal Howell, Michael L. Santella
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Patent number: 6123898Abstract: It is an objective of the present invention to provide low thermal expansion alloys having excellent high temperature mechanical properties, the oxidation resistance, and the electrical conductivity by modifying the basic Cr--W--Fe alloy in order to meet various industrial demands including prolonging the life of plant machinery being operated at high temperature and a scaling-up solid oxide fuel cell, so that the coefficient of thermal expansion can be approximated to those of stabilized zirconia. In order to achieve these objectives, Co is added to Cr--W--Fe system alloy possessing an excellent thermal matching characteristic to stabilized zirconia in order to enhance the high temperature mechanical properties without changing original properties of thermal matching, the oxidation resistance and the electrical conductivity. Cr and Al are added in order to further improve the oxidation resistance and to approximate the coefficient of surface thermal expansion to that of stabilized zirconia.Type: GrantFiled: May 25, 1999Date of Patent: September 26, 2000Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Hitoshi Taimatsu, Masami Ueda
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Patent number: 6048413Abstract: A corrosion resistant duplex stainless steel having an austenite-ferrite duplex phase matrix, less content of the expensive nickel and higher the resistance to both stress corrosion cracking and pitting in environments containing chloride ion is disclosed. The stainless steel is also scarcely influenced by the aging heat treatment. This stainless steel includes 20-30 wt % chromium, 3-9 wt % nickel, 3-8 wt % molybdenum, 0.20 wt % or less carbon, 0.5-2.0% silicon, 3.5 wt % or less manganese, 0.2-0.5% nitrogen and a balance of iron. The stainless steel may include at least one element selected from the group of 1.5 wt % or less titanium, 3 wt % or less tungsten, 2 wt % or less copper, and 2 wt % or less vanadium and include at least one element selected from the group of 0.001-0.01 wt % boron, 0.001-0.1 wt % magnesium, 0.001-0.1 wt % calcium, and 0.001-0.2 wt % aluminum.Type: GrantFiled: April 28, 1997Date of Patent: April 11, 2000Inventors: Yong Soo Park, Young Sik Kim
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Patent number: 6024778Abstract: A method of producing semi-finished metal iron or nickel-based products by spray forming in which one or more jets of nitrogen or a nitrogen-containing gas are directed onto a stream of molten alloy to atomise the same. A titanium addition is made to the liquid alloy before spray forming occurs. The atomised liquid or partially solidified droplets of alloy collect on a substrate to produce a semi-finished product.Type: GrantFiled: January 22, 1998Date of Patent: February 15, 2000Assignee: Special Melted Products LimitedInventor: Lee Hugh Shaw
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Patent number: 5942184Abstract: Stainless steels for high-purity gases which are superior in non-dusting characteristics required at the time of welding, corrosion resistance and non-catalytic property and which can be widely utilized in the manufacturing process of semiconductors, liquid crystal displays or the like. The austenitic stainless steels of the present invention are characterized by having decreased Mn, Al, Si and O contents. The austenitic stainless steels meet the non-dusting characteristics which are required at the time of welding. In addition, corrosion resistance, abrasion resistance and machinability are improved. The ferritic and the duplex stainless steels of the present invention are characterized in that they can readily form thereon a Cr oxide layer when subjected to oxidation treatment. The ferritic and two-phase stainless steels are superior in corrosion resistance to corrosive gases, and contain non-catalytic property against chemically-unstable gases.Type: GrantFiled: September 11, 1997Date of Patent: August 24, 1999Assignee: Sumitomo Metal Industries, Ltd.Inventors: Sigeki Azuma, Masahiro Honzi
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Patent number: 5849111Abstract: A super duplex stainless steel with low susceptibility to weld cracks and high weldability, as well as the resistance to stress corrosion cracking and toughness of the weld zones. The steel is therefore suitable for a wide range of applications including heat exchangers exposed to sea water, brine-resistant equipment and structures, pipings in chemical plants, line pipes, and oil well pipes. The steel includes, in weight %, 2.0% or less Si, 2.0% or less Mn, 22.0-24.0% Cr, 4.5-6.5% Ni, 4.0-4.8% Mo, 0.001-0.15% Al, and 0.25-0.35% N, the remains of Fe and inevitable impurities including 0.03% or less C, 0.05% or less P and 0.005% or less S, and a RVS, the index of susceptibility to cracking on welding, 7 or less, and a PREW, the index of pitting resistance, greater than 40.Type: GrantFiled: November 6, 1996Date of Patent: December 15, 1998Assignee: Sumitomo Metal Industries, Ltd.Inventors: Masaaki Igarashi, Kunio Kondo, Kazuhiro Ogawa, Masakatsu Ueda, Tomoki Mori
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Patent number: 5779820Abstract: The present invention relates to a process for producing a ferritic stainless steel having an improved corrosion resistance, and especially resistance to intergranular corrosion and to pitting corrosion. The steel is subjected, in a first phase, to cooling at a rate of between 400.degree. C. and 600.degree. C./hour down to a temperature of 900.degree. C. and then, in a second phase, to rapid cooling at a rate of between 1200.degree. C. and 1400.degree. C./h.Type: GrantFiled: March 17, 1997Date of Patent: July 14, 1998Assignee: Usinor SacilorInventors: Jean-Michel Hauser, Pascale Haudrechy
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Patent number: 5714115Abstract: The invention relates to an austenitic steel alloy which is corrosion-resistant, tough, non-magnetic and compatible with the skin. The invention also relates to a process for the production of said steel alloy and to uses thereof. The characterizing feature of the invention is a steel containing up to 0.3% C, 2 to 26% Mn, 11 to 24% Cr, more than 2.5 to 10% Mo, 0 to 8% W, more than 0.55 to 1.2% N, up to max 0.5% Ni and max 2 % Si, balance iron.Type: GrantFiled: March 27, 1996Date of Patent: February 3, 1998Assignee: VSG Energie-und Schmiedetechnik GmbHInventors: Markus O. Speidel, Peter J. Uggowitzer, Gerald Stein, Joachim Menzel
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Patent number: 5709836Abstract: A chromium steel sheet having excellent press formability, particularly deep-drawing formability and resistance to secondary work brittleness. The construction is a chromium steel sheet including C: not more than 0.03 wt %, Si: not more than 1.0 wt %, Mn: not more than 1.0 wt %, P: not more than 0.05 wt %, S: not more than 0.015 wt %, Al: not more than 0.10 wt %, N: not more than 0.02 wt %, Cr: 5-60 wt %, Ti: 4(C+N)-0.5 wt %, Nb: 0.003-0.020 wt %, B: 0.0002-0.005 wt %, and, if necessary, one or more selected from Mo: 0.01-5.0 wt %, Ca: 0.0005-0.01 wt % and Se: 0.0005-0.025 wt %, and the balance being Fe and inevitable impurities.Type: GrantFiled: February 28, 1996Date of Patent: January 20, 1998Assignee: Kawasaki Steel CorporationInventors: Mitsuyuki Fujisawa, Yasushi Kato, Takumi Ujiro, Susumu Satoh, Koji Yamato
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Patent number: 5512239Abstract: A ferritic stainless steel comprises C: not more than 0.025 wt %, Si: not more than 0.10 wt %, Mn: not more than 1.0 wt %, Cr: 17.0-25.0 wt %, Ni: not more than 0.50 wt %, Mo: 0.50-2.00 wt %, Al: not more than 0.025 wt %, N: not more than 0.025 wt %, at least one of Nb: 10(C wt %+N wt %)-1.0 wt % and Ti: 10(C wt %+N wt %)-1.0 wt %, and the balance being substantially Fe and inevitable impurities and is effectively used in various heat exchangers.Type: GrantFiled: April 18, 1995Date of Patent: April 30, 1996Assignees: Tokyo Radiator Mfg. Co., Ltd, Nippon Yakin Kogyo Co. Ltd., Nissan Motor Co., Ltd.Inventors: Yoshito Fujiwara, Yutaka Kobayashi, Mituo Kimura, Masatoshi Iio, Tohsaku Takamura
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Patent number: 5427634Abstract: To simultaneously satisfy retention of a high temperature strength at an initial stage, and during use, and NaCl-induced hot corrosion resistance as well as oxidation resistance in a high temperature member used in an exhaust system of automobiles, the present invention provides a heat-resistant ferrite system stainless steel which has a low (C+N) content, reduces a free (C+N) content by adding Ti or Zr, and can secure sufficiently efficiently solid solution strengthening and NaCl-induced hot corrosion resistance for a long time by sufficiently securing solid solution contents of W, Nb and Mo.Type: GrantFiled: December 8, 1993Date of Patent: June 27, 1995Assignee: Nippon Steel CorporationInventors: Nobuhiro Fujita, Keiichi Ohmura, Eiji Sato
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Patent number: 5395583Abstract: High chromium stainless steels having enhanced corrosion resistance are provided in which the steels have 25% to 35% by weight chromium; 0.1 to 5% by weight molybdenum; 0.1 to 6% by weight nickel; 0.0 to 4% by weight copper; 0.0 to 1% by weight titanium and/or niobium and/or vanadium; and, 0.02 to 5% by weight of a platinum group metal. The steels are particularly resistant to sulphuric and phosphoric acids.Type: GrantFiled: December 1, 1993Date of Patent: March 7, 1995Assignee: MintekInventors: Johannes H. Potgieter, Peter T. Wedepohl
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Patent number: 5383983Abstract: A martensitic stainless steel for use in oil wells has improved stability in strength and good resistance to sulfide stress corrosion cracking The steel has a chemical composition consisting essentially, on a weight basis, of: Si: not greater than 1.0%, Mn: not greater than 1.0%, Cr: 10.0-14.0%, Mo: 0.5-7.0%, Ni: 4.0-8.0%, Al: 0.001-0.1%, either Ti in an amount satisfying the following inequality (1) or Zr in an amount satisfying the following inequality (2), optionally one or both of Mg: 0.001-0.05% and Ce: 0.001-0.05%, and a balance of Fe and incidental impurities in which the contents of C, P, S, N, and V as impurities are limited to 0.05% or less, 0.04% or less, 0.005% or less, 0.05% or less, and 0.2% or less, respectively, the composition further satisfying the following inequalities (3) and (4):4(%C).ltoreq.%Ti.ltoreq.{-0.01/(%C+0.015))}+0.75 (1)10(%C).ltoreq.%Zr.ltoreq.2 0% (2)30(%Cr)+36(%Mo)+14(%Si)-28(%Ni).ltoreq.455 (3)21(%Cr)+25(%Mo)+17(%Si)+35(%Ni).ltoreq.731 (4).Type: GrantFiled: April 9, 1993Date of Patent: January 24, 1995Assignee: Sumitomo Metal Industries, Ltd.Inventors: Kunio Kondo, Takahiro Kushida, Masakatsu Ueda
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Patent number: 5158745Abstract: A high-nitrogen ferritic heat-resisting steel comprises, in weight per cent, 0.01-0.30% C, 0.02-0.80% Si, 0.20-1.00% Mn, 8.00-13.00% Cr, 0.50-3.00% W, 0.005-1.00% Mo, 0.05-0.50% V, 0.02-0.12% Nb and 0.10-0.50% N and is controlled to include not more than 0.050% P, not more than 0.010% S and not more than 0.020% O, the balance being Fe and unavoidable impurities. The steel may optionally comprise (A) one or both of 0.01-1.00% Ta and 0.01-1.00% Hf and/or (B) or both of 0.0005-0.10% Zr and 0.01-0.10% Ti. A method of producing the steel comprises melting and equilibrating the steel components in an atmosphere of a mixed gas of a prescribed nitrogen partial pressure or nitrogen gas and thereafter casting or solidifying the melt in an atmosphere controlled to have a nitrogen partial pressure of not less than 1.0 ata and a total pressure of not less than 4.0 ata, with the relationship between the partial pressure p and the total pressure P.sub.t being10.sup.P <P.sub.t.sup.0.37 +log.sub.10 6.Type: GrantFiled: February 15, 1991Date of Patent: October 27, 1992Assignees: Nippon Steel Corporation, Mitsubishi Jukogyo Kabushiki KaishaInventors: Yasushi Hasegawa, Peter Ernst, Fujimitsu Masuyama
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Patent number: 5110544Abstract: A stainless steel exhibiting excellent anticorrosion property for use in engine exhaust systems comprises not more than 0.010% C, not more than 0.2% Si, 0.05%-1.5% Mn, 12%-20% Cr, 0.2%-3.0% Mo, 0.005%-0.1% Al, not more than 0.015% N, not more than 0.025% P, not more than 0.010% S, either or both of 10.times.(C %+N %)-0.5% Ti and 5.times.(C %+N %) 0.5% Nb, and the balance of Fe and unavoidable impurities. An additional improvement in the anticorrosion property of the stainless steel can be obtained by further adding thereto one or more of 0.1%-1.0% Ni, 0.03%-1.0% Cu, 0.05%-0.5% W, 0.05%-0.5% V and 0.05%-1.0% Zr and/or one or both of 0.001%-0.03% Ca and 0.001%-0.03% Ce.Type: GrantFiled: November 27, 1990Date of Patent: May 5, 1992Assignee: Nippon Steel CorporationInventors: Eiji Sato, Ryo Matsuhashi, Satoshi Ito, Kazuhiro Tano, Kenichi Asakawa
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Patent number: 5106578Abstract: The present invention relates to a heat-resistant cast steel that comprises, on a weight basis, 0.06-0.20% C, 0.01-0.10% N, 0.4-2.0% Si, 0.3-1.0% Mn, not more than 0.04% P, not more than 0.04% S, 15-22% Cr, 0.01-2.0% Nb, with the balance being Fe and incidental impurities, and further preferably that is retained at a temperature not higher than the temperature of two-phase mixed region for a certain time and then is gradually cooled, after casting;a heat-resistant cast steel that comprises, on a weight basis, 0.06-0.20% C, 0.01-0.10% N, 0.4-2.0% Si, 0.3-1.0% Mn, not more than 0.04% P, not more than 0.04% S, 15-22% Cr, 0.01-2.0% Nb, 0.2-1.0% Mo, with the balance being Fe and incidental impurities, and further preferably that is retained at a temperature not higher than the temperature of two-phase mixed region for a certain time and then is gradually cooled, after casting;a heat-resistant cast steel that comprises on a weight basis, 0.06-0.20% C, 0.01-0.10% N, 0.4-2.0% Si, 0.3-1.0% Mn, not more than 0.Type: GrantFiled: November 30, 1990Date of Patent: April 21, 1992Assignees: Hitachi Metals Ltd., Nissan Motor Co., Ltd.Inventors: Kouki Ohtsuka, Kimio Kubo, Koichi Akiyama, Masahide Ike, Kunio Kawai
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Patent number: 5091147Abstract: The present invention relates to a heat-resistant cast steel that comprises, on a weight basis, 0.06-0.20% C, 0.01-0.10% N, 0.4-2.0% Si, 0.3-1.0% Mn, not more that 0.04% P, not more than 0.04% S, 15-22% Cr, 0.01-2.0% Nb, with the balance being Fe and incidental impuriites, and further preferably that is retained at a temperature not higher than the temperature of two-phase mixed region for a cerain time and then is gradually cooled, after casting;A heat-resistant cast steel that comprises, on a weight basis, 0.06-0.20% C, 0.01-0.10% N, 0.4-2.0% Si, 0.3-1.0% Mn, not more than 0.04% P, not more than 0.04% S, 15-22% Cr, 0.01-2.0% Nb, 0.2-1.0% Mo, with the balance being Fe and incidental impurities, and further preferably that is retained at a temperature not higher than the temperature of two-phase mixed region for a certain time and then is gradually cooled, after casting;A heat-resistant cast steel that comprises, on a weight basis, 0.06-0.20% C, 0.01-0.10% N, 0.4-2.0% Si, 0.3-1.0% Mn, not more than 0.Type: GrantFiled: November 30, 1990Date of Patent: February 25, 1992Assignees: Hitachi Metals, Ltd., Nissan Motor Co., Ltd.Inventors: Kouki Ohtsuka, Kimio Kubo, Koichi Akiyama, Masahide Ike, Kunio Kawai
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Patent number: 5069870Abstract: A high-strength high-Cr steel with excellent high-temperature strength and toughness as well as improved resistance to oxidation and high-temperature corrosion is disclosed, which consists essentially of, in weight %:C : 0.04-0.2%, Si: not greater than 0.7%, Mn: 0.1-1.5%, Ni: not greater than 1%, Cr: 8-14%, Mo: 0.01-1.2%, W: 0.8-3.5%, V : 0.1-0.3%, Nb: 0.01-0.2%, Al: not greater than 0.05%, Cu: 0.4-3%, Mg: 0.0005-0.5%, N: 0.001-0.1%, B : 0-0.02%,at least one of La, Ce, Y, Ca, Ti, Zr, and Ta each in an amount of 0-0.2%, andFe and incidental impurities: balance.Type: GrantFiled: March 6, 1990Date of Patent: December 3, 1991Assignee: Sumitomo Metal Industries, Ltd.Inventors: Atsuro Iseda, Yoshiatsu Sawaragi
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Patent number: 5061441Abstract: A steel from which rolls for a cold rolling mill are made and which gives to the rolls very excellent wear resistance in addition to thermal shock and spalling resistances and various mechanical characteristics is provided. Said steel comprises:C : 0.70 to 1.50 wt %Si: 0.15 to 1.00 wt %Mn: 0.15 to 1.50 wt %Cr: 2.50 to 10.00 wt %Mo: 1.00 wt % or lessV : 1.00 wt % or lessNi: 1.00 wt % or lessTi: 0.04 to 0.30 wt %with the balance being Fe and inevitable impurities.Type: GrantFiled: April 13, 1990Date of Patent: October 29, 1991Assignees: Kawasaki Steel Corporation, Kanto Special Steel Works, Ltd.Inventors: Ken'ichi Aoki, Yoshikazu Seino, Teruhiro Saito, Ken'ichi Tokoro
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Patent number: 5035855Abstract: A martensitic precipitation-hardenable stainless steel essentially consisting of, in weight percent, not more than 0.08% C, 0.5-4.0% Si, not more than 4.0% Mn, 5.0-9.0% Ni, 10.0-17.0% Cr, more than 0.3% and up to 2.5% Mo, 0.15-1.0% Ti, not more than 1.0% Al and not more than 0.03% N and the balance being Fe, and inevitable incidental impurities, which may contain 0.3-2.5% Cu is disclosed. This steel has low hardness before aging and exhibits high strength and good toughness after aging.Type: GrantFiled: January 4, 1990Date of Patent: July 30, 1991Assignee: Nisshin Steel Company, Ltd.Inventors: Takeshi Utsunomiya, Kazuo Hoshino, Sadao Hirotsu
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Patent number: 5030415Abstract: Ferritic chromium-molybdenum steels containing26 to 30% chromium1.8 to 3.0% molybdenum3.0 to 4.5% nickelcarbon.ltoreq.0.02%silicon.ltoreq.1.00%manganese.ltoreq.1.00%sulfur.ltoreq.0.015%carbon+nitrogen.ltoreq.0.045%niobium.gtoreq.12.times.%C.ltoreq.1.2%balance iron and impurities which are due to the melting technologyare used as corrosion-resisting material to make structural parts which are resistant to sulfuric acid in a concentration of and above 94% by weight and at a temperature up to the boiling point of the sulfuric acid.Type: GrantFiled: August 24, 1989Date of Patent: July 9, 1991Assignee: Metallegesellschaft AktiengesellschaftInventors: Karl-Heinz Dorr, Hermann Muller, Ulrich Sander, Wolfram Schalk, Ernst Wallis
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Patent number: 5000912Abstract: A needle alloy wherein the nickel content is between 6.3% and 9.5%, the chromium content is between 11.5% and 12.5% and the molydenum content is between 3% and 4%. In addition, tantalum and titanium should be present at a combined level of no more than 2.1%. Favorable results from this alloy cause needles to have a greater than 400,000 psi ultimate tensile strength.Type: GrantFiled: December 15, 1989Date of Patent: March 19, 1991Assignee: Ethicon, Inc.Inventors: Lee P. Bendel, Timothy A. Sardelis
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Patent number: 4957701Abstract: A high-strength high-Cr ferritic, heat-resistant steel exhibiting improved high-temperature, long-term creep strength and a process for producing the same are disclosed. The steel consists essentially of, by weight %:______________________________________ C: not more than 0.2%, Si: not more than 1.0%, Mn: 0.1-1.5%, P: not more than 0.03%, S: not more than 0.03%, Ni: not more than 1.0%, Cr: 5.0-15%, Mo: 0.02-3.0%, W: not more than 4.0%, sol. Al: 0.05-0.04%, N: not more than 0.07%, ______________________________________at least one of V: 0.01-0.4% and Nb: 0.01-0.3%, B: 0-0.02%,at least one of Ca, Ti, Zr, Y, La, and Ce: 0-0.2%, andthe balance Fe and incidental impurities,A.sub.cl point defined by Formula (1) below being 820 or higher.Type: GrantFiled: August 15, 1988Date of Patent: September 18, 1990Assignees: Sumitomo Metal Industries, Ltd., Mitsubishi Jukogyo Kabushiki KaishaInventors: Fujimitsu Masuyama, Takashi Daikoku, Hisao Haneda, Kunihiko Yoshikama, Hiroshi Teranishi, Atsuro Iseda
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Patent number: 4902473Abstract: A brake disc material which does not crack under a great braking action, such as in a large-sized truck, consisting of 0.03 percent to 1 percent of carbon, 1.2 percent to 20 percent of chromium, and 0.1 percent to 1 percent of molybdenum, the balance being essentially iron.Type: GrantFiled: November 16, 1987Date of Patent: February 20, 1990Assignee: Nippon Steel CorporationInventors: Hiroto Arata, Kenji Shiga, Daihachiro Sakurai, Kazuo Fujisawa, Isao Souma, Yusiyo Watanabe, Akira Tanaka
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Patent number: 4888153Abstract: An Fe-base build-up alloy excellent in resistance to corrosion and wear is disclosed. This alloy comprises in weight percent:C: from 0.005 to 1.6%,Mn: from 4 to 28%,Cr: from 12 to 36%,Mo: from 0.01 to 9%,Hf: from 0.005 to 15%,N: from 0.01 to 0.9%, andoptionally contained:Si: from 0 to 5%,Ni: from 0 to 30%, andone or both of:Nb and W: from 0 to 6%, andthe balance being Fe and incidental impurities.Type: GrantFiled: July 7, 1988Date of Patent: December 19, 1989Assignee: Mitsubishi Kinzoku Kabushiki KaishaInventors: Ritsue Yabuki, Saburo Wakita
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Patent number: 4881991Abstract: A steel for the production of as rolled products (products requiring no subsequent reheat treatment after finish rolling) for use in underground equipment and tools is provided which has a hardness in the order of 500 HV (Vickers); a Charpy toughness value at 20.degree.C. of 35 to 50 Joule; an excellent to fair corrosion resistance in simulated mild mine water as herein defined; and good to fair weldability; the steel having the following constitution on a percentage mass per mass basis:C=0.13 to 0.19; Cr=8.5 to 12.0;Ni=0 to 3.0; Si=0.10 to 0.5;Mn=0.3 to 0.9; Mo=0 to 1.4;Ti=0.01 to 0.04; Nb=0 to 0.06;Al=0.02 to 0.06; P=0.035(max); andS=0.02 (max); the balance being Fe.Type: GrantFiled: June 26, 1987Date of Patent: November 21, 1989Inventors: Thomas B. Beeton, Roelof J. Mostert, Emilia B. Navarro, Pierre R. Rosinger, Rudolf P. Badenhorst
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Patent number: 4846899Abstract: A low carbon steel has a composition which is ferritic, martensitic or ferritic: martensitic at temperatures of the order of 700.degree. C. and substantially fully austenitic at temperatures in excess of 1000.degree. C. and nitriding of a refractory stable metal nitride former, e.g. titanium, of the alloy is effected while the alloy is in its substantially fully austenitic state so as to produce a fine and homogeneous dispersion of the nitride and thereby enhance the creep strength of the alloy when in its ferritic, martensitic or ferritic: martensitic state.Type: GrantFiled: June 29, 1987Date of Patent: July 11, 1989Assignee: United Kingdom Atomic Energy AuthorityInventor: Andrew M. Wilson
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Patent number: 4822415Abstract: A novel iron based alloy is disclosed which is characterized by high resistance to wear and corrosion. The alloy consists essentially of 0 to 40% chromium, 1 to 40% molybdenum, 1 to 15% copper, 0.2 to 5% boron, and 0.01 to 2% carbon; the balance being incidental impurities and at least 30% iron, with the molydenum being at least 10% if the boron is greater than 2%. The alloy is preferably in the form of a powder for thermal spraying, and coatings produced thereby may have an amorphous structure.Type: GrantFiled: November 22, 1985Date of Patent: April 18, 1989Assignee: Perkin-Elmer CorporationInventors: Mitchell R. Dorfman, Subramaniam Rangaswamy, Josph D. Reardon
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Patent number: 4762577Abstract: Forgings fabricated from 9 Chromium - 1 Molybdenum, modified alloys are subjected to tempering at a temperature less than the ASTM specified minimum tempering temperature in the range from about 1275.degree. F. to about 1300.degree. F. for a period of time in the range of from about 5 to about 20 hours to cause the forging to have a room temperature yield strength in the range from about 85 to about 100 ksi. Such room temperature yield strengths permit the use of the alloy in the fabrication of high-pressure steam turbine rotors. Forgings fabricated from such alloys possess excellent high-temperature properties and the same are also weldable to facilitate repair of rotors fabricated therefrom and to facilitate the fabrication of the rotor in the first instance by forming the rotor from smaller sections which may be welded together and subsequently tempered at a temperature in the range from about 1275.degree. F. to about 1300.degree. F.Type: GrantFiled: January 30, 1987Date of Patent: August 9, 1988Assignee: Westinghouse Electric Corp.Inventor: Robert E. Clark
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Patent number: 4726853Abstract: The invention concerns a strip or sheet of ferritic stainless steel of the following composition (% by weight):(C+N)<.060;Si<0.9;Mn<1;Cr=15 to 19;Mo<1;Ni<0.5;Ti<0.1;Cu<0.4;S<0.02;P<0.045;Zr=0.10 to 0.40, and 7(C+N).ltoreq.Zr.ltoreq.7(C+N)+0.15;Nb=0.25 to 0.55, in non-combined form;Al=0.020 to 0.080;Fe=the balance,in which Al is essentially in solid solution.The process for the production of the sheet or strip comprises a final annealing operation which is carried out at between 980.degree. and 1020.degree. C., typically for 0.5 to 5 minutes at between 990.degree. and 1010.degree. C.The strip or sheet according to the invention is used for any application requiring an economic compromise in regard to ductility (sheet and welds), hot resistance and resistance to corrosion, for example in motor vehicle exhaust manifolds.Type: GrantFiled: October 27, 1986Date of Patent: February 23, 1988Assignee: Ugine Gueugnon SAInventors: Pascal Gressin, Pierre Pedarre, Jean Decroix, Philippe Maitrepierre
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Patent number: 4705581Abstract: A soft magnetic stainless steel consisting essentially of, by weight, up to 0.03% of C, 2.0 to 3.0% of Si, up to 0.40% of Mn, 0.015 to 0.050% of S, 10 to 13% of Cr, 0.05 to 0.20% of Ti, up to 0.03% of N, up to 0.010% of Al, and the balance of Fe and inevitable impurities, with a proviso that the C+N content is not more than 0.05%. The steel has a maximum permeability of not less than 4400 and a magnetic flux density of not less than 12,000 G as magnetic properties, together with a fatigue strength after welding of not lower than 120 kgf cm.sup.2, retains the magnetic properties even after annealing at a high temperature of 920.degree. C., and is excellent in electrical resistance, corrosion resistance, mechanical properties and machinability.Type: GrantFiled: April 14, 1986Date of Patent: November 10, 1987Assignee: Aichi Steel Works, Ltd.Inventors: Yoshinobu Honkura, Kouji Murata, Takashi Yokoyama
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Patent number: 4652428Abstract: A corrosion resistant alloy comprising in % by weight up to 0.05% of C, 10.00 to 18.00% of Cr, up to 1.00% of Si, up to 1.00% of Mn, more than 0.040% but not more than 0.150% of P, up to 0.050% of S, up to 0.60% of Ni and 0.005 to 0.50% of sol.Al, the balance being Fe and unavoidable impurities. The alloy has an enhanced pickling performance of the hot rolled material and an improved workability of the cold rolled material.Type: GrantFiled: October 10, 1985Date of Patent: March 24, 1987Assignee: Nisshin Steel Co., Ltd.Inventors: Shigeaki Maruhashi, Kazuo Hoshino, Yoshihiro Uematsu, Katsuhisa Miyakusu, Takehiko Fujimura
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Patent number: 4640722Abstract: A ferritic alloy steel having good formability, cyclic oxidation resistance and creep strength at elevated temperatures above 1000.degree. F. and particularly above about 1500.degree. F. (816.degree. C.) after a final anneal at 1850.degree. to 2050.degree. F. (1010.degree. to 1120.degree. C.), comprising 0.05% maximum carbon, about 2% maximum manganese, greater than 1.0% to 2.25% silicon, less than 0.5% aluminum, with silicon being at least 3 times the aluminum content, about 6% to about 25% chromium, up to about 5% molybdenum, with the sum of chromium and molybdenum being at least 8%, 0.05% maximum nitrogen, at least one of titanium, zirconium and tantalum, with said titanium, zirconium and tantalum being present in an amount at least equal to the stoichiometric equivalent of the present carbon plus the percent nitrogen, at least 0.1% uncombined columbium, and balance essentially iron.Type: GrantFiled: February 25, 1985Date of Patent: February 3, 1987Assignee: Armco Inc.Inventor: Mark D. Gorman
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Patent number: H807Abstract: An austenitic stainless steel that is comprised of Fe, Cr, Mn, C but no Ni or Nb and minimum N. To enhance strength and fabricability minor alloying additions of Ti, W, V, B and P are made. The resulting alloy is one that can be used in fusion reactor environments because the half-lives of the elements are sufficiently short to allow for handling and disposal.Type: GrantFiled: November 16, 1988Date of Patent: August 7, 1990Assignee: The United States of America as represented by the United States Department of EnergyInventors: Ronald L. Klueh, Philip J. Maziasz