Molybdenum Or Tungsten Containing Patents (Class 420/67)
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Publication number: 20090032246Abstract: An oil country tubular good for expansion according to the invention is expanded in a well. The oil country tubular good for expansion according to the invention is formed of duplex stainless steel having a composition containing, in percentage by mass, 0.005% to 0.03% C, 0.1% to 1.0% Si, 0.2% to 2.0% Mn, at most 0.04% P, at most 0.015% S, 18.0% to 27.0% Cr, 4.0% to 9.0% Ni, at most 0.040% Al, and 0.05% to 0.40% N, and the balance consisting of Fe and impurities, a structure including an austenite ratio in the range from 40% to 90%. The oil country tubular good for expansion according to the invention has a yield strength from 256 MPa to 655 MPa, and a uniform elongation more than 20%. Therefore, the oil country tubular good for expansion according to the invention has a high pipe expansion characteristic.Type: ApplicationFiled: September 29, 2008Publication date: February 5, 2009Inventors: Hideki Takabe, Masakatsu Ueda, Kunio Kondo, Taro Ohe
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Publication number: 20080213120Abstract: Martensitic stainless steel according to the invention contains, by mass, 0.001% to 0.01% C, at most 0.5% Si, 0.1% to 3.0% Mn, at most 0.04% P, at most 0.01% S, 10% to 15% Cr, 4% to 8% Ni, 2.8% to 5.0% Mo, 0.001% to 0.10% Al, at most 0.07% N, 0% to 0.25% Ti, 0% to 0.25% V, 0% to 0.25% Nb, 0% to 0.25% Zr, 0% to 1.0% Cu, 0% to 0.005% Ca, 0% to 0.005% Mg, 0% to 0.005% La, and 0% to 0.005% Ce, with the balance being Fe and impurities, and the steel satisfies Expressions (1) and (2) and has a yield stress in the range from 758 MPa to 860 MPa. In this way, in the martensitic stainless steel according to the invention, the tempering temperature range at which a yield stress in the range from 758 MPa to 860 MPa can be obtained is increased. 922.6?554.5C?50.9Mn+2944.8P+1.056Cr?81.1Ni+95.8Mo?125.1Ti?1584.9Al?376.1N?600 ??(1) 30C+0.5Mn+Ni+0.5Cu?1.5Si?Cr?Mo+7.Type: ApplicationFiled: October 26, 2005Publication date: September 4, 2008Applicant: SUMITOMO METAL INDUSTRIES, LTD.Inventor: Hideki Takabe
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Patent number: 7396420Abstract: The present invention provides a steel sheet having a chemical composition comprising 0.15% or less C, 2.0% or less Si, 3.0% or less Mn, P, S, A1 and N in adjusted amounts, from 0.5 to 3.0% Cu, or one or more of Cr, Mo and W in a total amount of 2.0% or less, and having a composite structure comprising ferrite and martensite having an area ratio of 2% or more. The steel sheet is in the form of a high-strength hot-rolled steel sheet, a high-strength cold-rolled steel sheet, or a hot-dip galvanized steel sheet. There is thus available a steel sheet excellent in press-formability and in strain age hardening property as represented by a ?TS of 80 MPa or more.Type: GrantFiled: May 2, 2003Date of Patent: July 8, 2008Assignee: JFE Steel CorporationInventors: Saiji Matsuoka, Tetsuo Shimizu, Kei Sakata, Osamu Furukimi
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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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Publication number: 20080112840Abstract: Disclosed is duplex stainless steel that containes relatively low content of Ni, and limits constituents of Cr—Mo—Mn—N to make volume fraction of ? and ? have about 50:50, thereby minimizing incidence of a edge crack to enhance a production yield and decrease a processing load, in which the alloy constituents includes Cr of 19.5˜22.5%. Mo of 0.5-2.5%, Ni if 1.0-3.0%, Mn of 1.5-4.5%, N of 0.15-0.25%, Fe and unavoidable elements, and a constitution range of the alloy constituents are adjusted to make a CPt higher than 20° C. depending on the constitution range of the alloy constituents. Thus, the contents of Cr, Mo and Ni is decreased and the content of Mn is increased a little, so that a production cost thereof is reduced; the corrosion resistance is secured to be better than the STS 304 steel and the 316L steel; the incidence of the edge cract is decreased while being hot-rolled, thereby decreasing a load on the following process; and the surface defective is decreased, thereby improving a production yield.Type: ApplicationFiled: December 22, 2005Publication date: May 15, 2008Inventors: Kwang-tae Kim, Yong-Heon Lee, Won-qeun Son
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Patent number: 7347903Abstract: A duplex stainless steel for use in urea manufacturing plants, in mass %, consisting of C: 0.03% or less, Si: 0.5% or less, Mn: 2% or less, P: 0.04% or less, S: 0.003% or less, Cr: 26% or more, but less than 28%, Ni: 6-10%, Mo: 0.2-1.7%, W: more than 2%, but no more than 3%, N: more than 0.3%, but no more than 0.4%, with the balance being Fe and impurities, in which the content of Cu as an impurity is not more than 0.3%. The duplex stainless steel may also have Ca, Ce, and B content, and it is desirable that levels of Al and O (oxygen) as an impurities be no more than 0.05% and 0.01% respectively. Further, it is preferable that an increase in the Vickers hardness of the steel should not be more than 80, before and after the solution treated steel is subjected to the heat treatment of 800° C. for 30 minutes and subsequent water cooling. This duplex stainless steel possesses a high corrosion resistance.Type: GrantFiled: January 29, 2003Date of Patent: March 25, 2008Assignees: Sumitomo Metal Industries, Ltd., Toyo Engineering CorporationInventors: Yoshimi Yamadera, Eiki Nagashima
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Publication number: 20080069718Abstract: Alloy compositions suitable for fabricating medical devices, such as stents, are disclosed. In certain embodiments, the compositions have small amounts of nickel, e.g., the compositions can be substantially free of nickel.Type: ApplicationFiled: September 27, 2007Publication date: March 20, 2008Applicant: BOSTON SCIENTIFIC SCIMED, INC.Inventor: Charles Horace Craig
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Patent number: 7341690Abstract: The soft Cr-containing steel includes, on a % by mass basis, C: from about 0.001% to about 0.020%, Si: more than about 0.10% and less than about 0.50%, Mn: less than about 2.00%, P: less than about 0.060%, S: less than about 0.008%, Cr: from about 12.0% to about 16.0%, Ni: from about 0.05% to about 1.00%, N: less than about 0.020%, Nb: from about 10×(C+N) to about 1.00%, Mo: more than about 0.80% and less than about 3.00%, wherein the contents of alloying elements, represented by Si and Mo, respectively, on a % by mass, satisfy the formula Si?1.2?0.4Mo, so as to prevent precipitation of the Laves phase and to stably secure an effect of increasing high-temperature strength due to solid solution Mo.Type: GrantFiled: December 9, 2003Date of Patent: March 11, 2008Assignee: JFE Steel CorporationInventors: Atsushi Miyazaki, Junichiro Hirasawa, Mineo Muraki, Yoshihiro Yazawa, Osamu Furukimi
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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: 7294212Abstract: Material for stainless steel sheets is heated to a temperature within a range of 850 to 1250° C. and cooled at a rate 1° C./s or faster, the material including 0.02% by mass or less of C, 1.0% by mass or less of Si, 2.0% by mass or less of Mn, 0.04% by mass or less of P, 0.01% by mass or less of S, 0.1% by mass or less of Al, 11% by mass or more but less than 17% by mass of Cr, 0.5% by mass or more but, less than 3.0% by mass of Ni, and 0.02% by mass or less of N, so as to satisfy specific relationships between the compositions.Type: GrantFiled: April 30, 2004Date of Patent: November 13, 2007Assignee: JFE Steel CorporationInventors: Junichiro Hirasawa, Takumi Ujiro, Osamu Furukimi
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Patent number: 7156979Abstract: A thermal cracking process using tubes, pipes, and coils made of. An outermost surface covering not less than 55% of stainless steel, said surface having a thickness from 0.1 to 15 microns and being a spinel of the formula MnxCr3-xO4 wherein x is from 0.5 to 2 is not prone to coking and is suitable for hydrocarbyl reactions such as furnace tubes for cracking.Type: GrantFiled: September 30, 2004Date of Patent: January 2, 2007Assignee: Nova Chemicals (International) S.A.Inventors: Leslie Wilfred Benum, Michael C. Oballa, Sabino Steven Anthony Petrone, Weixing Chen
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Patent number: 6974506Abstract: This invention relates to a method of manufacturing an improved ferritic or martensitic alloy based on iron and chromium strengthened by a dispersion of oxides, commonly called an Oxide Dispersion Strengthened or ODS alloy, and, more particularly to a method of manufacturing a ferritic or martensitic ODS alloy with large grains based on iron and chromium which has a single phase ferritic or martensitic matrix having an isotropic microstructure and a grain size that is sufficient to guarantee mechanical strength compatible with a use of this alloy at high temperature and/or under neutron irradiation. According to the invention, the method comprises slow cooling of an austenite at a cooling rate less than or equal to the critical cooling rate for transformation of this austenite into ferrite.Type: GrantFiled: September 25, 2002Date of Patent: December 13, 2005Assignee: Commissariat a l'Energie AtomiqueInventors: Véronique Lambard, Ana Alamo, Jean-Louis Seran
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Patent number: 6881280Abstract: An iron-based corrosion resistant and wear resistant alloy is addressed. The alloy contains (in weight percent) 1.1-1.4% carbon, 11-14.25% chromium, 4.75-6.25% molybdenum, 3.5-4.5% tungsten, 0-3% cobalt, 1.5-2.5% niobium, 1-1.75% vanadium, 0-2.5% copper, up to 1.0% silicon, up to 0.8% nickel, up to 0.6% manganese, and the balance iron. The alloy is suitable for use in valve seat insert applications.Type: GrantFiled: August 15, 2002Date of Patent: April 19, 2005Assignee: L.E. Jones CompanyInventor: Cong Yue Qiao
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Patent number: 6841122Abstract: A hot working die steel contains 0.05-0.25% C, 0.30% or less Si, 0.03% or less Mn, 1.0% or less Ni, 5.0-13.0 % Cr, 2.0% or less Mo, 1.0-8.0% W, 1.0-10.0% Co, 0.003-0.020% B, 0.005-0.050% N, and the balance consisting essentially of Fe and unavoidable impurities. If desired, the hot working die steel may further contain 0.01-1.0% V and 0.01-1.0% of at least one kind selected from Nb and Ta.Type: GrantFiled: April 29, 2002Date of Patent: January 11, 2005Assignee: The Japan Steel Works, Ltd.Inventors: Rinzo Kayano, Eiji Maeda
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Publication number: 20040250926Abstract: An alloy suitable for coating metal surfaces is provided in which the alloy provides a liquid melt which contains a fraction of dissolved oxide forming additives as deoxidizers. The alloyed combination of elements in the liquid melt resists compound formation thus preserving the chemical activity of the individual elements. In a coating application, the alloy may form a coating that can interact with and remove the oxide or residual oxide coating of the base metal to be coated, i.e., scrub the surface of the metal clean. This results in increased coating bond strength and the ability to bond effectively to normally difficult alloys such as stainless steel, refractory metals (W, Ti, Ta etc.), or aluminum alloys which form protective oxide layers.Type: ApplicationFiled: February 11, 2004Publication date: December 16, 2004Inventor: Daniel James Branagan
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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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Publication number: 20040226634Abstract: Material for stainless steel sheets is heated to a temperature within a range of 850 to 1250° C. and cooled at a rate 1° C./s or faster, the material including 0.02% by mass or less of C, 1.0% by mass or less of Si, 2.0% by mass or less of Mn, 0.04% by mass or less of P, 0.01% by mass or less of S, 0. 1% by mass or less of Al, 11% by mass or more but less than 17% by mass of Cr, 0.5% by mass or more but, less than 3.0% by mass of Ni, and 0.02% by mass or less of N, so as to satisfy specific relationships between the compositions.Type: ApplicationFiled: April 30, 2004Publication date: November 18, 2004Applicant: JFE STEEL CORPORATIONInventors: Junichiro Hirasawa, Takumi Ujiro, Osamu Furukimi
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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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Publication number: 20040166015Abstract: A high-Cr containing ferrite heat resistant steel having not only an excellent long-term creep strength at a high temperature exceeding 650° C., but also an improved oxidation resistance, which is based on ferritic phase and contains 13% by weight or more of chromium, and containing precipitates of intermetallic compounds.Type: ApplicationFiled: October 10, 2003Publication date: August 26, 2004Inventor: Kazuhiro Kimura
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Patent number: 6712912Abstract: A weld filler metal alloy composition and a method for welding stainless steel components into a final assembly includes the steps of: austenitizing the stainless steel components to be welded at a temperature of 1800° F.-2000° F.; applying, using conventional arc welding techniques a solid wire of the filler metal alloy comprising in % by weight: up to 0.02% carbon; up to 0.8% manganese; up to 0.02% phosphorus; up to 0.015% sulfur; up to 0.6% silicon; 4.5-5.5% nickel; 0.4-0.7% molybdenum; 10-12.5% chromium; up to 0.1% copper; balance essentially iron and incidental impurities; and tempering the welded assembly welded at a temperature of 930° F.-1300° F. A second tempering step conducted at a temperature of 1095° F.-1145° F. may follow. The welding method can be used to make compressor impellers (6). The compressor impeller components comprise 13Cr-4Ni stainless steel.Type: GrantFiled: October 23, 2002Date of Patent: March 30, 2004Assignee: Elliott Turbomachinery Co., Inc.Inventors: Douglas K. Richards, Phillip Dowson
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Patent number: 6689231Abstract: The invention relates to a ferrite-austenitic alloy and its use, the alloy has a composition with a mixture defined as: C maximum 0.05%, Si maximum 0.8%, Mn 0.30-1.5%, Cr 28.0-30.0%, Ni 5.80-7.40%, Mo 2.00-2.50%, N 0.30-0.40%, Cu maximum 1.0%, W maximum 2.0%, S maximum 0.010%, 30-70% ferrite and the balance austenite for tubes filled with hydraulic fluid, as transport tubes for solutions for chemical injection, or another uses in the application of umbilicals.Type: GrantFiled: June 21, 2000Date of Patent: February 10, 2004Assignee: Sandvik ABInventor: Pasi Kangas
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Publication number: 20030188813Abstract: A structural hot-rolled or cold-rolled stainless steel sheet having improved intergranular corrosion resistance and toughness at the welding heat affected zone and further having low strength and high elongation. The composition of the steel sheet contains less than about 0.008 mass percent of C; about 1.0 mass percent or less of Si; about 1.5 mass percent or less of Mn; about 11 to about 15 mass percent of Cr; more than about 1.0 mass percent and about 2.5 mass percent or less of Ni; less than about 0.10 mass percent of Al; about 0.009 mass percent or less of N; about 0.04 mass percent or less of P; about 0.01 mass percent or less of S; and the balance being Fe and incidental impurities. These contents satisfy the expressions: (Cr)+1.2×(Ni)≧15.0; (Ni)+0.5×(Mn)+30×(C)≦3.0; (C)+(N)≦0.015; and (Cr)−(Mn)−1.7×(Ni)−27×(C)−100×(N)≧9.0.Type: ApplicationFiled: March 24, 2003Publication date: October 9, 2003Applicant: KAWASAKI STEEL CORPORATIONInventors: Junichiro Hirasawa, Takumi Ujiro, Osamu Furukimi
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Publication number: 20030172999Abstract: A ferritic-austenitic stainless steel having a microstructure which essentially consists of 35-65 vol-% ferrite and 35-65 vol-% austenitc has a chemical composition which contains in weight-%: 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, optionally Mo and/or W in a total amount of max 1.0 (Mo+W/2), optionally Cu up to max 1.0 Cu, 0.15-0.30 N, balance iron and impurities. The following conditions shall apply for the chromium and nickel equivalents: 20<Creq<24.5, 10<Nieq, where (Creq=Cr+1.5 Si+Mo+2 Ti+0.5 Nb, and Nieq=Ni+0.5 Mn+30 (C+N)+0.5 (Cu+Co).Type: ApplicationFiled: April 24, 2003Publication date: September 18, 2003Inventors: Elisabeth Alfonsson, Jun Wang, Mats Liljas, Per Johansson
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Patent number: 6582652Abstract: The present invention is directed towards an austenitic, stainless steel series 300 alloy having improved biocompatible characteristics. The modified stainless steel alloy consists essentially of, in weight percent, about C Mn Si P S Cr Mo ≦0.030 ≦2.00 ≦0.750 ≦0.023 ≦0.010 8.5-11.5 0.0-6.25 Ni Fe “X” 6.5-7.5 46.185-74.000 5.0-10.0 whereby variable “X” could be comprised from a group consisting of Gold, Osmium, Palladium, Platinum, Rhenium Tantalum, or Tungsten. The alloy provides a unique combination of strength, ductility, corrosion resistance, and other mechanical properties which also has improved biocompatible characteristics.Type: GrantFiled: May 11, 2001Date of Patent: June 24, 2003Assignee: Scimed Life Systems, Inc.Inventor: Charles Horace Craig
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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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Publication number: 20030086810Abstract: A cold-workable, corrosion-resistant ferritic chromium steel, comprising 0,005 to 0.1% of carbon, 0.2 to 1.2% of silicon, 0,4 to 2.0% of manganese, 8 to 20% of chromium, 0.1 to 1.2% of molybdenum, 0.01 to 0.5% of nickel, 0.5 to 2.0% of copper, 0.001 to 0.6% of bismuth, 0.002 to 0.01% of vanadium, 0.002 to 0.1% of titanium, 0.002 to 0.1% of niobium, 0.15 to 0.8% of sulfur and 0.001 to 0.08% of sulfur and 0.001 to 0.08% of nitrogen, remainder iron including smelting-related impurities, is suitable as a material for precision-mechanics applications and precision appliances, in particular spinning and spraying nozzles, tips and heads for writing implements, on account of its good mechanical processibility, in particular its good machinability, its good wear resistance and surface quality.Type: ApplicationFiled: August 30, 2002Publication date: May 8, 2003Inventors: Gunter Schnabel, Thomas Wegler, Dieter Geile
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Patent number: 6551420Abstract: A duplex stainless steel including, in weight percent, up to 0.06 percent carbon, 15 up to less than 25 percent chromium, greater than 3 up to 6 percent nickel, up to 3.75 percent manganese, 0.14 up to 0.35 percent nitrogen, up to 2 percent silicon, greater than 1.4 up to less than 2.5 percent molybdenum, up to less than 0.5 percent copper, up to less than 0.2 percent cobalt, up to 0.05 percent phosphorous, up to 0.005 percent sulfur, and 0.001 up to 0.0035 percent boron, with the remainder being iron and incidental impurities is disclosed. The duplex stainless steel may be included in an article of manufacture, such as a strip, bar, plate, sheet, casting, tubing or piping. A method for making such a duplex stainless steel is also disclosed.Type: GrantFiled: October 16, 2001Date of Patent: April 22, 2003Assignee: ATI Properties, Inc.Inventors: David S. Bergstrom, John J. Dunn, John F. Grubb, William A. Pratt
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Publication number: 20030056862Abstract: A weld filler metal alloy composition and a method for welding stainless steel components into a final assembly includes the steps of: austenitizing the stainless steel components to be welded at a temperature of 1800° F.-2000° F.; applying, using conventional arc welding techniques a solid wire of the filler metal alloy comprising in % by weight: up to 0.02% carbon; up to 0.8% manganese; up to 0.02% phosphorus; up to 0.015% sulfur; up to 0.6% silicon; 4.5-5.5% nickel; 0.4-0.7% molybdenum; 10-12.5% chromium; up to 0.1% copper; balance essentially iron and incidental impurities; and tempering the welded assembly welded at a temperature of 930° F.-1300° F. A second tempering step conducted at a temperature of 1095° F.-1145° F. may follow. The welding method can be used to make compressor impellers (6). The compressor impeller components comprise 13Cr-4Ni stainless steel.Type: ApplicationFiled: October 23, 2002Publication date: March 27, 2003Inventors: Douglas K. Richards, Phillip Dowson
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Publication number: 20030053925Abstract: The present invention is directed towards an austenitic, stainless steel series 300 alloy having improved biocompatible characteristics. The modified stainless steel alloy consists essentially of, in weight percent, about 1 C Mn Si P S ≦0.030 ≦2.00 ≦0.750 ≦0.023 ≦0.010 Cr Mo Ni Fe “X” 8.5-11.5 0.0-6.25 6.5-7.5 46.185-74.000 5.0-10.Type: ApplicationFiled: May 11, 2001Publication date: March 20, 2003Inventor: Charles Horace Craig
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Patent number: 6485678Abstract: A unique iron base alloy for wear resistant applications, characterized in one aspect by its hardening ability when exposed to a certain temperature range, is useful for valve seat insert applications. The alloy also possesses excellent wear resistance, hot hardness and oxidation resistance. The alloy comprises less than 0.1 wt % carbon; about 18 to about 32 wt % molybdenum, about 6 to about 15 wt % chromium, about 1.5 to about 3% silicon, about 8 to about 15 wt % cobalt and at least 40% iron, with less than 0.5 wt % nickel. In another aspect, for lower temperature applications, the cobalt is optional, the nickel content can be up to 14 wt %, but the molybdenum must be in the range of about 29% to about 36%. In one further aspect, for higher temperature applications, the cobalt is optional, but may be used up to 15 wt %, nickel must be used at a level of between about 3 and about 14 wt %, and the molybdenum will be in the range of about 26 to about 36 wt %.Type: GrantFiled: June 20, 2000Date of Patent: November 26, 2002Assignee: Winsert Technologies, Inc.Inventors: Xuecheng Liang, Gary R. Strong
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Publication number: 20020164261Abstract: A shaped article which is manufactured by casting in air or under inert-gas shrouding at atmospheric pressure is disclosed. The shaped article provides a superior combination of high strength, hardness, ductility, and corrosion resistance compared to the known air-castable stainless steels. A cast article in accordance with this invention is made from a high strength, castable, stainless steel alloy having the following weight percent composition. 1 C 0.1 max. Mn 2 max. Si 1 max. P 0.05 max. S 0.05 max. Cr 9-13 Ni 4-8 Mo 4-8 Co 8-16 N 0.1 max.Type: ApplicationFiled: February 28, 2002Publication date: November 7, 2002Inventor: James W. Martin
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Patent number: 6444168Abstract: In order to produce elements for furnaces, reactors or conduits on the walls of which coke can appear, steels are used with a composition which is adapted to resist coking comprising, by weight, at most 0.25% of C, 1.5% to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.030% of S and at most 0.03% of P, the complement to 100% being essentially iron. Novel steel compositions for use in these applications are those which comprise, by weight, at most 0.25% of C, more than 2.5% and up to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.03% of S and at most 0.03% of P, the complement to 100% being essentially iron.Type: GrantFiled: October 2, 2000Date of Patent: September 3, 2002Assignee: Institu Francais du PetroleInventors: Philipe Lecour, Xavier Longaygue, Francois Ropital
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Patent number: 6436338Abstract: An iron-based corrosion resistant and wear resistant alloy is addressed. The alloy contains (in weight percent) 1.1-1.4% carbon, 11-14.25% chromium, 4.75-6.25% molybdenum, 3.5-4.5% tungsten, 0-3% cobalt, 1.5-2.5% niobium, 1-1.75% vanadium, 0-2.5% copper, up to 1.0% silicon, up to 0.8% nickel, up to 0.6% manganese, and the balance iron. The alloy is suitable for use in valve seat insert applications.Type: GrantFiled: May 30, 2000Date of Patent: August 20, 2002Assignee: L. E. Jones CompanyInventor: Cong Yue Qiao
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Patent number: 6375895Abstract: Disclosed is a hardfacing alloy capable of withstanding abrasion of the order of silicious earth particles and weldable in crack free state on industrial products, such as tool joints and stabilizers used in oil and gas well drilling, and other industrial products. The hardfacing alloy has a low coefficient of friction, high abrasion resistance as welded without working, and in tool joints and stabilizers achieves an optimum balance between tool joint and stabilizer wear resistance and induced casing wear. Other embodiments of the invention include tool joints having the hardbanding alloy welded to the outer cylindrical surface to its box and pin members and to stabilizer ribs on the stabilizer used in earth boring, such as boring for oil and gas, other industrial products, methods of producing the hardfacing alloy, and methods of applying the hardfacing alloy to surfaces including preheat and post-welding conditions to withstand abrasive use.Type: GrantFiled: June 14, 2000Date of Patent: April 23, 2002Assignee: ATT Technology, Ltd.Inventor: Roger Auguste Daemen
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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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Publication number: 20010031217Abstract: The present invention relates to a duplex stainless steel alloy with austenite-ferrite structure, which in hot extruded and annealed finish shows high strength, good corrosion resistance, as well as good weldability which is characterized in that the alloy contains in weight-% max 0.05% C, 0-2.0% Si 0-3.0% Mn, 25-35% Cr, 4-10% Ni, 2-6% Mo, 0.3-0.6% N, as well as Fe and normally occurring impurities and additions, whereby the content of ferrite is 30-70%.Type: ApplicationFiled: March 2, 2001Publication date: October 18, 2001Inventors: Orjan Bergstrom, Pasi Kangas, Mattias Klockars, Goucai Chai
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Patent number: 6303237Abstract: A compound tube including a layer of a Fe—Cr alloy and a layer of load-carrying component, with the optional addition of further layers. The Fe—Cr alloy preferably has a composition including, in weight-%: less than 0.3% carbon, 15-60% chromium, less than 10% nickel, less than 5% molybdenum, less than 5% silicon, less than 0.3% nitrogen, less than 5% manganese, and the remainder iron with naturally occurring impurities. The compound tubes are very resistant to carbonization and metal dusting, and are suited for use as bayonet tubing, superheater tubing, and reforming tubing in steam formation environments.Type: GrantFiled: March 17, 2000Date of Patent: October 16, 2001Assignee: Sandvik ABInventors: Urban Forsberg, Johan Lindén
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Publication number: 20010023725Abstract: The proposed brake disk consists of steel of a composition of 0.1 to 0.4% of carbon, up to 1.0% of silicon, up to 2.0% of manganese, up to 0.02% of sulfur, 11 to 16% of chromium, up to 1.0% of nickel and 0.5 to 1.5% of molybdenum, the remainder being iron and production-related impurities.Type: ApplicationFiled: February 28, 2001Publication date: September 27, 2001Inventor: Walter Grimm
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Patent number: 6290905Abstract: A welding method for two members adapted to be welded and formed of a low-alloy steel for structural purposes causing the weld metal to develop martensite transformation during cooling after welding, so that the weld metal becomes expanded to a greater degree at room temperature than at a temperature at which the martensite transformation initiates. The welding material comprises a ferrous alloy containing C, Cr, Ni, Si, Mn, Mo and Nb, all of which meet substantially with the contents of the following equation (1): 170≦719−(795×C wt %)−(23.7×Cr wt %)−(26.5×Ni wt %)−(35.55×Si wt %)−(13.25×Mn wt %)−(23.7×Mo wt %)−(11.85×Nb wt %)<250 (1).Type: GrantFiled: February 16, 2000Date of Patent: September 18, 2001Assignee: Kawasaki Steel CorporationInventors: Osamu Watanabe, Akihiko Ohta, Chiaki Shiga, Satoshi Nishijima
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Patent number: 6235238Abstract: In order to produce elements for furnaces, reactors or conduits on the walls of which coke can appear, steels are used with a composition which is adapted to resist coking comprising, by weight, at most 0.25% of C, 1.5% to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.030% of S and at to most 0.03% of P, the complement to 100% being essentially iron. Novel steel compositions for use in these applications are those which comprise, by weight, at most 0.25% of C, more than 2.5% and up to 5% of Si, 4% to 10% of Cr, 0.5% to 2% of Mo, 0.3% to 1% of Mn, at most 0.03% of S and at most 0.03% of P, the complement to 100% being essentially iron.Type: GrantFiled: March 31, 1999Date of Patent: May 22, 2001Assignee: Institut Francais du PetroleInventors: Philippe Lecour, Xavier Longaygue, François Ropital
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Patent number: 6235237Abstract: A chromium steel alloy with 0.2 to 0.65% of carbon, 12.0 to 20.0% of chromium, 0.3 to 5.0% of molybdenum, 0.02 to 0.4% of nitrogen, up to 2% of manganese, up to 1.4% of silicon, up to 2% of nickel, up to 0.5% of copper, up to 0.2% of vanadium and/or niobium and up to 0.1% of aluminum, the remainder being iron including impurities resulting from smelting, is suitable as a material for gliding elements of sports equipment, in particular winter sports equipment.Type: GrantFiled: February 25, 1999Date of Patent: May 22, 2001Assignee: Stahlwerk Ergste Westig GmbHInventors: Heinz Jurgen Osing, Klaus Peter Rittinghaus, Gisbert Kloss-Ulitzka
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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: 6096262Abstract: A martensitic heat resisting steel having improved heat resistance, which consists by weight percentage of 0.35%.ltoreq.C.ltoreq.0.60%, 1.0%.ltoreq.Si.ltoreq.2.5%, 0.1%.ltoreq.Mn<1.5%, 7.5%.ltoreq.Cr.ltoreq.13.0%, one or both of 1.0%.ltoreq.Mo.ltoreq.3.0% and 1.0%.ltoreq.W.ltoreq.3.0% so that 1.5%.ltoreq.(Mo+0.5W).ltoreq.3.0%, optionally 0.1%.ltoreq.Nb+Ta.ltoreq.1.0%, 0.1%.ltoreq.V.ltoreq.1.0% and S.ltoreq.0.1%, and the remainder is substantially Fe.Type: GrantFiled: May 4, 1999Date of Patent: August 1, 2000Assignee: Daido Tokushuko Kabushiki KaishaInventors: Shigeki Ueta, Toshiharu Noda, Michio Okabe
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Patent number: 6093233Abstract: The invention concerns a nickel free stainless steel alloy having a ferritic and magnetic structure, characterised in that it contains at least 0.4% in weight of nitrogen, and at most 0.5% in weight of nickel, the remainder being formed of iron and the inevitable impurities. The invention also concerns an external part for a watch made of such a steel alloy.Type: GrantFiled: June 10, 1999Date of Patent: July 25, 2000Assignee: Asulab S.A.Inventor: Pierre Magnin
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Patent number: 6051081Abstract: This steel is applicable for making seamless tubes with a high mechanical strength, high pitting resistance and a high hot-formability, by means of a process comprising meltdown in an electric-arc furnace, refining in an AOD converter, ascensional ingot casting and Gothic section billet rolling, and then transforming the billet obtained into seamless tubes by upsetting the gothic billet into a round followed by hot piercing in a vertical press, tube extrusion in a horizontal press, reduction in a stretch reduction mill and Pilger cold-rolling, and having a composition of not more than 0.02% C, 0.65 to 0.85% Mn, 0.40 to 0.60% Si, 25.2 to 25.6% Cr, 6.2 to 6.6% Ni, 3.6 to 3.8% Mo, 0.24 to 0.30% N, not more than 0.025% P, not more than 0.002% S, with no Cu and W, and with the addition of a percentage of B ranging between 0.0015 to 0.0030% and a percentage of Ca ranging between 0.0010 to 0.0050%.Type: GrantFiled: June 29, 1998Date of Patent: April 18, 2000Assignee: Tubacex, S.A.Inventors: Javier Valle Echevarria, Jose Manuel Gerrero de la Serna
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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: 5985209Abstract: A martensitic steel for a line pipe having excellent corrosion resistance and weldability is disclosed. The martensitic steel contains about:0.02 wt % or less of C, 0.50 wt % or less of Si,0.2 to 3.0 wt % of Mn, 10 to 14 wt % of Cr,0.2 to 7.0 wt % of Ni, 0.2 to 5.0 wt % of Mo,0.1 wt % or less of Al, 0.07 wt % or less of N, andthe balance being Fe and incidental impurities; andthese elements satisfy substantially the following equations:(Cr %)+(Mo %)+0.1(N %)-3(C %).gtoreq.12.2,(Cr %)+3.5(Mo %)+10(N %)+0.2(Ni %)-20(C %).gtoreq.14.5, and150(C %)+100(N %)-(Ni %)-(Mn %).ltoreq.4.The martensitic steel may further contain at least one element selected from the group consisting ofabout 2.0 wt % or less of Cu, about 0.15 wt % or less of Ti, about 0.15 wt % or less of Zr, about 0.15 wt % or less of Ta andabout 0.006 wt % or less of Ca, andthese elements satisfy substantially the following equations:(Cr %)+(Mo %)+0.1(N %)+3(Cu %)-3(C %).gtoreq.12.2,(Cr %)+3.5(Mo %)+10(N %)+0.2(Ni %)-20(C %).gtoreq.14.Type: GrantFiled: March 21, 1997Date of Patent: November 16, 1999Assignee: Kawasaki Steel CorporationInventors: Mitsuo Kimura, Yukio Miyata, Tomoya Koseki, Takaaki Toyooka, Fumio Murase
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Patent number: 5944920Abstract: Disclosed is a piston ring material excellent in workability, which consists essentially of, by weight, 0.4 to 1.0% of C, 5.0 to 25.0% of Cr, at least one of not more than 0.25% Si and not more than 0.30% Mn, and balance of Fe and impurities. The material may optionally contain one or more elements of Mo, W, V and Nb in place of a part of Fe.Type: GrantFiled: October 14, 1997Date of Patent: August 31, 1999Assignee: Hitachi Metals, Ltd.Inventor: Katsuaki Fukushima
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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: 5906791Abstract: A steel comprises additives including rare earth elements, boron and at least one of rhenium, osmium, iridium, ruthenium, rhodium. The steel exhibits resistance to embrittlement, oxidation and creep. The steel also comprises balanced amounts of nickel and cobalt to minimize a ratio of nickel to cobalt, and optimize aging embrittlement resistance with as tempered toughness. The steel comprises, by weight percent: at least one of rhenium, osmium, iridium, ruthenium, rhodium (0.01 to 2.00); rare earth element (0.50 max.); boron (0.001-0.04); carbon (0.08-0.15); silicon (0.01-0.10); chromium (8.00-13.00); at least one of tungsten and molybdenum (0.01 to 2.00); at least one austenite stabilizer; such as nickel, copper, cobalt and manganese (0.001-6.00); vanadium (0.25-0.40); phosphorus (0.010 max.); sulfur (0.004 max.); nitrogen (0.060 max.); hydrogen (2 ppm max.); oxygen (50 ppm max.); aluminum (0.001-0.025); arsenic (0.0060 max.); antimony (0.0030 max.); tin (0.0050 max.); iron (balance).Type: GrantFiled: July 27, 1998Date of Patent: May 25, 1999Assignee: General Electric CompanyInventor: Thomas Martin Angeliu