Nine Percent Or More Chromium(cr) (e.g., Stainless Steel, Etc.) Patents (Class 148/605)
  • Patent number: 10407747
    Abstract: Provided are a cold working tool material with which high hardness can be obtained in a broad range of tempering temperatures, and a cold working tool manufacturing method using same. The present invention is a cold working tool material comprising a steel component composition that contains, in mass %, C: 0.65-2.40%, Cr: 5.0-15.0%, Mo and W alone or combined (Mo+½W): 0.50-4.00%, V: 0.10-1.50%, and N: greater than 0.0300% to 0.0800%, in which martensitic structure can be adjusted by quenching, and in which, in a 90 ?m long 90 ?m wide region of a cross-sectional structure that does not contain carbides with equivalent circle diameters exceeding 5.0 ?m, the number density of carbides A with equivalent circle diameters greater than 0.1 ?m to 2.0 ?m is at least 9.0×105/mm2 and the number density of carbides B with equivalent circle diameters greater than 0.1 ?m to 0.4 ?m is at least 7.5×105/mm2.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: September 10, 2019
    Assignee: HITACHI METALS, LTD.
    Inventors: Tatsuya Shouji, Setsuo Mishima, Yukio Shinji, Katsufumi Kuroda
  • Patent number: 9932651
    Abstract: A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the Vickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: April 3, 2018
    Assignee: JFE Steel Corporation
    Inventors: Yasuhide Ishiguro, Mitsuo Kimura, Kenichiro Eguchi, Hiroshi Yokogawa, Tadao Katagiri, Masahito Tanaka
  • Patent number: 9777344
    Abstract: Provided is a ferrite-based stainless steel having superior moldability when molding a fuel cell divider sheet from a material by controlling yield point elongation in accordance with alloy components. The ferrite-based stainless steel comprises, in weight percentages: no more than 0.02% of C; no more than 0.02% of N; no more than 0.4% of Si; no more than 0.2% of Mn; no more than 0.04% of P; no more than 0.02% of S; 25.0-32.0% of Cr; 0-1.0% of Cu; no more than 0.8% of Ni; no more than 0.01-0.5% of Ti; no more than 0.01-0.5% of Nb; no more than 0.01-1.5% of V; and residual Fe and inevitable elements, wherein the content of Ti, Nb, V, C, and N in terms of weight % of steel uses Formula (1) to render a yield point elongation of the material of no more than 1.1%, and wherein a steel material has superior moldability. 9.1C?1.76V+5.37(C+N)/Ti?1.22Nb?0.7.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: October 3, 2017
    Assignee: POSCO
    Inventors: Jong Hee Kim, Ki-Hoon Jo, Yang Jin Chung, Yun Yong Lee, Sang Woo Lee
  • Patent number: 9771110
    Abstract: A method is provided for enhancing in-service structural performance of a sheet metal component incorporating a discontinuity. The method comprises heat-treating a zone of the sheet metal component a predetermined distance from the discontinuity thereby changing the strength and ductility of the zone and shifting the deformation induced in the sheet metal component by a subsequent deformation event away from the discontinuity to the zone.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: September 26, 2017
    Assignee: Ford Global Technologies, LLC
    Inventors: Ari Garo Caliskan, Jo Ann Clarke
  • Patent number: 9284631
    Abstract: Disclosed are a hypereutectic white iron alloy and articles such as pump components made therefrom. Besides iron and unavoidable impurities the alloy comprises, in weight percent based on the total weight of the alloy, from 2.5 to 6.5 C, from 0.04 to 1.2 N and from 18 to 58 Cr and, optionally, one or more of Mn, Ni, Co, Cu, Mo, W, V, Mg, Ca, Si, rare earth elements, Nb, Ta, Ti, Zr, Hf, Al, B.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: March 15, 2016
    Inventors: Roman Radon, Raphael Radon
  • Publication number: 20150111065
    Abstract: Polycrystalline material comprising a plurality of nano-grains of a crystalline phase of an iron group element and a plurality of crystalline grains of material including carbon (C) or nitrogen (N); each nano-grain having a mean size less than 10 nanometres.
    Type: Application
    Filed: May 24, 2013
    Publication date: April 23, 2015
    Inventors: Igor Yurievich Konyashin, Bernd Heinrich Ries, Frank Friedrich Lachmann
  • Patent number: 8808474
    Abstract: A method fabricating a stainless martensitic steel, including electroslag remelting then cooling an ingot of the steel, then at least one austenitic thermal cycle heating the ingot above its austenitic temperature followed by a cooling. During each cooling: if the cooling is not followed by an austenitic thermal cycle, holding the ingot at a holding temperature included in the ferritic-pearlitic transformation nose for a hold time longer than sufficient for transforming the austenite into a ferritic-pearlitic structure in the ingot as completely as possible at the holding temperature; if the cooling is followed by an austenitic thermal cycle, before its minimum temperature falls below the martensitic transformation start temperature, the ingot is either held throughout the period between the two austenitic thermal cycles at a temperature above the austenitic transformation completion temperature on heating, or held at the holding temperature included in the ferritic-pearlitic transformation nose.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: August 19, 2014
    Assignee: SNECMA
    Inventors: Laurent Ferrer, Patrick Philipson
  • Patent number: 8684594
    Abstract: A constant-modulus alloy, which has a low saturation magnetic flux density to provide weakly magnetic properties, a high Young's modulus, a low temperature coefficient of Young's modulus, and high hardness, is provided. A hairspring, a mechanical driving apparatus and a watch and clock, in which the alloy is used, are provided. The alloy consists of Co, Ni, Cr, Mo. and Fe. The alloy is healed and cooled before being subjected to repeated wiredrawing and intermediate annealing, forming a wire with a fiber structure having a <111> fiber axis. The wire is then cold rolled into a sheet and heated to obtain optimal magnetic insensitivity and hardness.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: April 1, 2014
    Assignees: The Foundation: The Research Institute for Electric and Magnetic Materials, Seiko Instruments Inc.
    Inventors: Yuetsu Murakami, Koichiro Jujo, Osamu Takahashi, Jun Tsuneyoshi, Ryo Sugawara, Takeshi Takano
  • 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
  • Patent number: 8628631
    Abstract: The present invention provides a ferritic stainless steel casting and a sheet thereof excellent in deep drawability, punch stretchability and ridging resistance and a method for producing the casting and the sheet. In the present invention, a chemical composition is controlled so that the amounts of C, N, Si, Mn, P and Ti may be reduced to the utmost for securing high workability and, on the basis of the chemical composition, the roping and ridging of a steel sheet product is reduced by adding Mg, thus dispersing Mg containing oxides that accelerate the formation of nuclei for solidification and, resultantly, suppressing the development of coarse columnar crystals in a casting. The present invention is characterized in that the average composition of the Mg containing oxides dispersing in a casting satisfies the following expressions <2> and <3>, 17.4(Al2O3)+3.9(MgO)+0.3(MgAl2O4)+18.7(CaO)?500??<2>, (Al2O3)+(MgO)+(MgAl2O4)+(CaO)?95??<3>.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: January 14, 2014
    Assignee: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Akihiko Takahashi, Junichi Hamada, Ken Kimura, Takashi Morohoshi, Yoshihito Yamada, Toyohiko Kakihara, Satoshi Hashimoto
  • Publication number: 20140007994
    Abstract: A method for quenching a steel pipe by water cooling from an outer surface thereof, where pipe end portions are not subjected to water cooling, and at least part of a main body other than the pipe end portions is subjected to water cooling. A region(s) that is not subjected to direct water cooling over an entire circumference thereof can be along an axial direction at least in part of the main body other than the pipe end portions. The start and stop of water cooling can be intermittent at least in part of the quenching. During the water cooling of the pipe outer surface, an intensified water cooling can be performed in a temperature range in which the pipe outer surface temperature is higher than Ms point. Thereafter, the cooling can be switched to moderate cooling so that the outer surface is cooled down to Ms point or lower.
    Type: Application
    Filed: March 13, 2012
    Publication date: January 9, 2014
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Akihiro Sakamoto, Kazuo Okamura, Kenji Yamamoto, Tomohiko Omura, Yuji Arai
  • Publication number: 20130263979
    Abstract: A ferritic stainless steel useful as conduit members for emission of automotive exhaust gas consists of C up to 0.03 mass %, Si up to 1.0 mass %, Mn up to 1.5 mass %, Ni up to 0.6 mass %, 10-20 mass % of Cr, Nb up to 0.50 mass %, 0.8-2.0 mass % of Cu, Al up to 0.03 mass %, 0.03-0.20 mass % of V, N up to 0.03 mass % and the balance being Fe except inevitable impurities with a provision that at least 90% of Cu contained is dissolved in a steel matrix and that Nb?8(C+N). The steel may further contain 0.05-0.30 mass % of Ti and/or 0.0005-0.02 mass % of B. Mo as an inevitable impurity is controlled to be less than 0.10 mass %. The steel has excellent formability, low-temperature toughness and weldability as well as the same heat-resistance as Nb, Mo-alloyed steel.
    Type: Application
    Filed: October 1, 2012
    Publication date: October 10, 2013
    Applicant: NISSHIN STEEL CO., LTD.
    Inventors: Manabu Oku, Yoshitomo Fujimura, Toshirou Nagoya
  • Publication number: 20130143141
    Abstract: An oxidation-resistant ferritic stainless steel including a ferritic stainless steel base material, and a Cu-containing spinel-structured oxide.
    Type: Application
    Filed: November 27, 2012
    Publication date: June 6, 2013
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventor: KOREA INSITUTE OF SCIENCE AND TECHNOLOGY
  • Patent number: 8317944
    Abstract: One or more embodiments relates to a high-temperature, titanium alloyed, 9 Cr-1 Mo steel exhibiting improved creep strength and oxidation resistance at service temperatures up to 650° C. The 9 Cr-1 Mo steel has a tempered martensite microstructure and is comprised of both large (0.5-3 ?m) primary titanium carbides and small (5-50 nm) secondary titanium carbides in a ratio of. from about 1:1.5 to about 1.5:1. The 9 Cr-1 Mo steel may be fabricated using exemplary austenizing, rapid cooling, and tempering steps without subsequent hot working requirements. The 9 Cr-1 Mo steel exhibits improvements in total mass gain, yield strength, and time-to-rupture over ASTM P91 and ASTM P92 at the temperature and time conditions examined.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: November 27, 2012
    Assignee: U.S. Department of Energy
    Inventors: Paul D. Jablonski, David Alman, Omer Dogan, Gordon Holcomb, Christopher Cowen
  • Patent number: 8293038
    Abstract: The present invention provides a ferritic stainless steel casting and a sheet thereof excellent in deep drawability, punch stretchability and ridging resistance and a method for producing the casting and the sheet. In the present invention, a chemical composition is controlled so that the amounts of C, N, Si, Mn, P and Ti may be reduced to the utmost for securing high workability and, on the basis of the chemical composition, the roping and ridging of a steel sheet product is reduced by adding Mg, thus dispersing Mg containing oxides that accelerate the formation of nuclei for solidification and, resultantly, suppressing the development of coarse columnar crystals in a casting. The present invention is characterized in that the average composition of the Mg containing oxides dispersing in a casting satisfies the following expressions <2> and <3>, 17.4(Al2O3)+3.9(MgO)+0.3(MgAl2O4)+18.7(CaO)?500??<2>, (Al2O3)+(MgO)+(MgAl2O4)+(CaO)?95??<3>.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: October 23, 2012
    Assignee: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Akihiko Takahashi, Junichi Hamada, Ken Kimura, Takashi Morohoshi, Yoshihito Yamada, Toyohiko Kakihara, Satoshi Hashimoto
  • Patent number: 8246767
    Abstract: The invention relates to a composition and heat treatment for a high-temperature, titanium alloyed, 9 Cr-1 Mo steel exhibiting improved creep strength and oxidation resistance at service temperatures up to 650° C. The novel combination of composition and heat treatment produces a heat treated material containing both large primary titanium carbides and small secondary titanium carbides. The primary titanium carbides contribute to creep strength while the secondary titanium carbides act to maintain a higher level of chromium in the finished steel for increased oxidation resistance, and strengthen the steel by impeding the movement of dislocations through the crystal structure. The heat treated material provides improved performance at comparable cost to commonly used high-temperature steels such as ASTM P91 and ASTM P92, and requires heat treatment consisting solely of austenization, rapid cooling, tempering, and final cooling, avoiding the need for any hot-working in the austenite temperature range.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: August 21, 2012
    Assignee: The United States of America, as represented by the United States Department of Energy
    Inventors: Paul D. Jablonski, David Alman, Omer Dogan, Gordon Holcomb, Christopher Cowen
  • Publication number: 20120118442
    Abstract: A stainless steel having good conductivity and ductility for use in a fuel cell separator is provided. In particular, the stainless steel has a composition of, in terms of % by mass, C: 0.01% or less, Si: 1.0% or less, Mn: 1.0% or less, S: 0.01% or less, P: 0.05% or less, Al: 0.20% or less, N: 0.02% or less, Cr: 20 to 40%, Mo: 4.0% or less, and at least one selected from Nb, Ti, and Zr: 0.05 to 0.60% in total, the balance being Fe and unavoidable impurities. At least one precipitate having an equivalent circle diameter of 0.1 ?m or more is present per 100 ?m2, a ratio of a thickness t (?m) to a maximum diameter Dmax (?m) of the precipitates satisfies formula (1) below 20?t/Dmax??(1) and the thickness is 200 ?m or less.
    Type: Application
    Filed: July 26, 2010
    Publication date: May 17, 2012
    Applicant: JFE Steel Corporation
    Inventors: Shinsuke Ide, Atsutaka Honda, Shin Ishikawa, Takumi Ujiro
  • Publication number: 20120080124
    Abstract: The invention provides an alloy steel having the following composition: Ni 5-14 wt %; Cr 4-16 wt %; Co 7-14 wt %; Mo 1-5 wt %; W 0-5 wt %; Ti 0-0.8 wt %; Al 0.1-3 wt %; the balance being Fe save for incidental impurities. This provides an ultra-high strength corrosion resistant steel with good toughness, which does not significantly creep at temperatures up to 450° C. The high quantity of alloying to elements, particularly chromium, also gives the alloy good corrosion resistance. The alloy is particularly suitable for main shafts of gas turbine engines.
    Type: Application
    Filed: September 14, 2011
    Publication date: April 5, 2012
    Applicant: ROLLS-ROYCE PLC
    Inventors: Andrew T.W. BARROW, Harshad K.D.H. BHADESHIA, Martin J. RAWSON, Paul O. HILL
  • Patent number: 8143985
    Abstract: Disclosed is a power distribution transformer having a body of the transformer, the body consisting of a coil and an iron core; a tank containing the body of the transformer and an insulation substance which fills an inner space of the tank; and an upper lid of the tank. The tank and/or the upper lid is made of a ferritic stainless steel.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: March 27, 2012
    Assignees: Hitachi Industrial Equipment Systems Co., Ltd., Nippon Steel & Sumikin Stainless Steel Corp.
    Inventors: Masao Hosokawa, Mitsuaki Kawashima, Kazuyuki Fukui, Kouji Yamashita, Izumi Muto, Eiichiro Ishimaru, Hiroshige Inoue
  • Patent number: 8075991
    Abstract: A stainless steel material for a fuel cell, used for a fuel cell or a cartridge for the fuel cell, having a magnetic permeability of 1.000 to 2.500, and forming a layer having a value of chromium atomic %/iron atomic % of not less than 3.0 in the most surface thereof, and/or the layer of thickness of not less than 12 nm calculated as SiO2 having an oxygen atomic % of not less than 20%. Even when brought into contact with the content solution exhibiting acidity of the fuel cell, the stainless steel material reliably suppresses the elution of metal ions thereof.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: December 13, 2011
    Assignee: Toyo Seikan Kaisha, Ltd.
    Inventors: Kouki Kinouchi, Wataru Kurokawa, Shouzou Shintani, Kinuyo Shintani, legal representative, Daisuke Imoda, Kenji Yoshihiro, You Yamamori
  • 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
  • Patent number: 7922840
    Abstract: A method for producing hot-rolled strip from austenitic stainless steels. In a first step, a cast product is subjected to a rolling operation in a rolling mill with a finishing train, and, in a second step, a heat treatment is carried out to prevent susceptibility to corrosion, especially intergranular corrosion due to chromium carbide precipitation. To establish the final rolling temperature (Twe), a run-in temperature (Tein) of the cast product into the finishing train of the rolling mill that is above 1,150° C., and preferably above 1,200° C., is established by a multistage heating process, especially a two-stage heating process, which comprises a preheating stage and an intensive heating stage, and the heat treatment is carried out by directly utilizing the rolling heat.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: April 12, 2011
    Assignee: SMS Siemag Aktiengesellschaft
    Inventors: Ingo Schuster, Manfred Albedyhl
  • Patent number: 7914732
    Abstract: The present invention provides: a ferritic stainless steel cast iron including: Fe as a main component; C: 0.20 to 0.40 mass %; Si: 1.00 to 3.00 mass %; Mn: 0.30 to 3.00 mass %; Cr: 12.0 to 30.0 mass %; and one of Nb and V, or both of Nb and V in total: 1.0 to 5.0 mass %, the ferritic stainless steel cast iron satisfying the following formula (1): 1400?1562.3?{133WC+14WSi+5WMn+10(WNb+WV)}?1480??(1) wherein, WC (mass %), WSi (mass %), WMn (mass %), WCr (mass %), WNb (mass %), WV (mass %) and WCu (mass %) are contents of C, Si, Mn, Cr, Nb, V and Cu, respectively; a process for producing a cast part from the ferritic cast steel; and the cast part.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: March 29, 2011
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Hiroyuki Takabayashi, Shigeki Ueta, Tetsuya Shimizu, Toshiharu Noda
  • Publication number: 20100158744
    Abstract: The present invention has as its object the production of high strength electrical steel sheet, having a high strength of a tensile strength TS of for example 500 MPa or more, having wear resistance, and having superior magnetic properties of magnetic flux density and iron loss, that is, provides a method of production of high strength electrical steel sheet containing, by mass %, C: 0.060% or less, Si: 0.2 to 6.5%, Mn: 0.05 to 3.0%, P: 0.30% or less, S or Se: 0.040% or less, Al: 2.50% or less, N: 0.020% or less, and further one or more of Cu: 0.001 to 30.0% and Nb: 0.03 to 8.
    Type: Application
    Filed: June 16, 2006
    Publication date: June 24, 2010
    Inventor: Hidekuni Murakami
  • Patent number: 7704338
    Abstract: This invention relates to a method of manufacturing a martensitic stainless steel. The method comprises the following steps (a) to (c): (a) preparing a steel having a chemical composition consisting of, by mass %, C: 0.003 to 0.050%, Si: 0.05 to 1.00%, Mn: 0.10 to 1.50%, Cr: 10.5 to 14.0%, Ni: 1.5 to 7.0%, V: 0.02 to 0.20%, N: 0.003 to 0.070%, Ti: not more than 0.300% and the balance Fe and impurities, and P and S among impurities are not more than 0.035% and not more than 0.010% respectively, and that it also satisfies the following equation: ([Ti]?3.4×[N])/[C]>4.5 wherein [C], [N] and [Ti] mean the content (mass %) of C, N and Ti, respectively, (b) heating the steel at a temperature between 850 and 950° C., (c) quenching the steel, and (d) tempering the steel at a temperature between Ac1?35° C. and Ac1+35° C. and in a condition of not more than 0.5 of the value of variation ?LMP1 in the softening characteristics LMP1, which is defined by the following equation: LMP1=T×(20+1.
    Type: Grant
    Filed: September 16, 2004
    Date of Patent: April 27, 2010
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventor: Mutsumi Tanida
  • Publication number: 20100089504
    Abstract: Precipitation-hardened, martensitic, cast stainless steel having a composition comprising, by mass, 0.08-0.18% of C, 1.5% or less of Si, 2.0% or less of Mn, 0.005-0.4% of S, 13.5-16.5% of Cr, 3.0-5.5% of Ni, 0.5-2.8% of Cu, 1.0-2.0% of Nb, and 0.12% or less of N, the amounts of C, N and Nb meeting the condition of ?0.2?9(C %+0.86N %)?Nb %?1.0, the rest being Fe and inevitable impurities, and having a structure in which Cu precipitates having an average particle size of 0.1-0.4 ?m are dispersed in a tempered-martensite-based matrix.
    Type: Application
    Filed: March 21, 2008
    Publication date: April 15, 2010
    Inventors: Masahide Kawabata, Seiichi Endo, Masanori Hara, Koki Otsuka
  • Patent number: 7625455
    Abstract: A method of heat treating stainless steel in the form of blanks, piping, tubing, strip, or wire-like material, after rolling the material, and in a heat treatment furnace at a temperature higher than about 900° C. The material is subjected to a preheating stage and a final heating stage, wherein in the preheating stage flames from burners are directed toward the surface of the material to impinge on the surface. Burners situated in the preheating stage are supplied with a fuel that burns with the aid of an oxidizing gas that contains gaseous oxygen. The material is held in the preheating stage long enough to obtain at least some degree of oxidation on the surface of the material, and the material is heated further in a following, final heating stage by burners situated in a furnace and that are supplied with a fuel and an oxidizing gas.
    Type: Grant
    Filed: February 17, 2003
    Date of Patent: December 1, 2009
    Assignee: Linde AG
    Inventors: Carl-Lennart Axelsson, Tomas Ekman, Ola Ritzén
  • Patent number: 7618503
    Abstract: The present invention provides a method for heat-treating seam-welded constructions of hardenable steel and ferrous alloys with reduced weld-zone hardness and improved weld-zone ductility and toughness. This method consists of heating the seam weld rapidly with a secondary heat source to a temperature greater than the martensitic start temperature but not greater than the lower critical temperature, followed by immediately allowing the seam weld to air-cool. The rapid tempering of this invention is particularly suited to the production of high strength hardenable alloy seam-welded pipe and tubing and other structures.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: November 17, 2009
    Inventors: Edward J. McCrink, Daniel S. Codd
  • Publication number: 20080251163
    Abstract: This invention provides a technique for rendering bio-toxicity such as allergy toxicity derived from Ni trace impurity, i.e., nickel toxicity, which is unavoidably present in a bio-Co—Cr—Mo alloy or an Ni-free stainless steel alloy unharmful, characterized in that an element selected from the group consisting of the group 4, 5 and 13 elements of the periodic table, particularly an element selected from the group consisting of the group 4 elements of the periodic table, is added to the alloy composition. The additive element is preferably an element selected from the group consisting of zirconium and titanium, more preferably zirconium.
    Type: Application
    Filed: March 28, 2005
    Publication date: October 16, 2008
    Applicant: IWATE UNIVERSITY
    Inventors: Akihiko Chiba, Shingo Kurosu, Naoyuki Nomura
  • Patent number: 6926780
    Abstract: The present invention relates to a method of surface treatment of metallic materials, more particularly, to a method of the surface self-nanocrystallization of metallic materials by the bombarding of supersonic fine particles. The method comprises the step of bombarding the surface of metallic substrate material with fine particles at supersonic speed of 300-1200 m/s carried by a compressed gas, which is ejected from a nozzle. The present method can be used for the surface self-nanocrystallization of metallic parts with a complicated structure or a large area, and the nanometer layer obtained is homogeneous. In addition, it can be operated in a simple way with low energy consumption, low cost, high efficiency of production and high surface nanocrystallization rate of from 1 cm2 to 10 cm2/min.
    Type: Grant
    Filed: July 23, 2002
    Date of Patent: August 9, 2005
    Assignee: Institute of Metal Research
    Inventors: Tianying Xiong, Tiefan Li, Jie Wu, Huazi Jin, Minjie Wu, Jinsheng Chen, Ming Li
  • Patent number: 6893727
    Abstract: This invention relates to a stainless steel gasket having markedly improved strength and fatigue properties due to precipitation strengthening. Its composition comprises C: at most 0.03%, Si: at most 1.0%, Mn: at most 2%, Cr: 16.0%-18.0%, Ni: 6.0%-8.0%, N: at most 0.25%, if necessary Nb: at most 0.30%, and a remainder of Fe and unavoidable impurities. After cold rolling, final annealing is carried out, and after a structure is formed of recrystallized grains with an average grain diameter of at most 5 ?m having an area ratio of 50-100% and an unrecrystallized portion having an area ratio of 0-50%, a metal gasket is formed by steps including temper rolling with a reduction of at least 30% to make the area ratio of a strain induced martensite phase at least 40%, and forming and heat treatment at 200-350° C.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: May 17, 2005
    Assignees: Sumitomo Metal Industries, Ltd., Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kazuhiko Adachi, Seishi Ishiyama, Kenichi Goshokubo, Takashi Katsurai
  • Publication number: 20040057862
    Abstract: The present invention provides a martensitic heat resistant alloy having a composition (A) comprising, % by weight: 0.03 to O.15% of C; 0.01 to 0.9% of Si: 0.01 to 1.5% of Mn; 8.0 to 13.0% of Cr; 0.0005 to 0.015% of Al; ;no more than 2.0% of Mo; no more than 4.0% of W; 0.05 to 0.5% of V; 0.01 to 0.2% of Nb; 0.1 to 5.0% of Co; 0.O08 to 0.03% of B; less than 0.005% of N: and Fe and inevitable impurities as the remainder, wherein (B) the contents (% by weight) of Mo, W, B and N satisfy the following formulae (1) and (2).
    Type: Application
    Filed: March 13, 2003
    Publication date: March 25, 2004
    Inventors: Toshiaki Horiuchi, Masaaki Igarashi, Fujio Abe
  • Patent number: 6635128
    Abstract: A work-hardened poppet exhaust valve for internal combustion engines is obtained from a solutioned work-hardenable austenitic stainless steel coil or bar stock in which chromium is present in the range of 13%-25% by weight, nickel is present in the range of 4%-16% by weight, manganese is present in the range of 0.25%-8% by weight, copper is present in the range of 0.5%-7% by weight, the interstitial elements carbon plus nitrogen are present in a total amount less than 0.45% by nitrogen are present in a total amount less than 0.45% by weight, and at least one refractory metal selected from the group consisting of molybdenum, niobium, vanadium, tungsten and tantalum is present in the range of 1%-5% by weight. The coil or bar stock is extruded to a poppet valve preform configuration at a temperature in the range of room temperature to 1,000° F., and at a true strain of more than 0.8. The parameters of extrusion provide said work-hardened poppet valve with a stem hardness more than Rc=25.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: October 21, 2003
    Assignee: TRW Inc.
    Inventors: William Neumann, Roger R. Wills, Mohan Kurup, Victor Levin
  • Publication number: 20030145916
    Abstract: A turbine rotor material, that has sufficient corrosion resistance and stress corrosion cracking resistance and appropriate strength and toughness in a good balance, and a manufacturing method thereof are provided. The turbine rotor material is a 12Cr alloy steel that contains: C of 0.01 to 0.10%, Si of 0.01 to 0.50%, Mn of 0.1 to 1.0%, Cr of 9 to 13%, Ni of 2 to 7%, Mo of 0.3 to 3%, N of 0.01 to 0.10%, all in weight percent, and remains of Fe and incidental impurities.
    Type: Application
    Filed: October 25, 2002
    Publication date: August 7, 2003
    Inventors: Masatomo Kamada, Masahiro Saito, Akitsugu Fujita, Yusaku Takano
  • Patent number: 6588494
    Abstract: The invention relates to a process for the casting of thin strip having a thickness of less than 10 mm, made of ferritic stainless steel, directly from liquid metal between two rotating cooled rolls having parallel horizontal axes, characterized in that: the said ferritic stainless steel contains (in percentages by weight) from 11 to 18% chromium, less than 1% manganese, less than 1% silicon and less than 2.5% molybdenum; the said ferritic stainless steel has carbon and nitrogen contents, the sum of the contents not exceeding 0.05%; the said ferritic stainless steel contains at least one of the stabilizing elements titanium, niobium, zirconium and aluminium and the sum of their contents is between 0.05 and 1%; the other elements present are iron and the usual impurities resulting from the smelting. The subject of the invention is also thin strip capable of being obtained by the above process.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: July 8, 2003
    Assignee: Usinor
    Inventors: Frédéric Mazurier, Philippe Paradis
  • Patent number: 6589363
    Abstract: A stainless steel hydraulic component and method for making same hard turns a pre-heat treated stainless steel material, preferably a 400 series stainless steel material, provided in bar stock form in a single machining loading. Stainless steel hydraulic valve components made therefrom have shown improved leakage rate performance with the performance being fairly constant over a period of time for providing a longer functional life for the hydraulic valve component.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: July 8, 2003
    Assignee: Eaton Corporation
    Inventors: Daniel P. Rohde, John N. Tackes
  • Publication number: 20030124019
    Abstract: 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: Application
    Filed: November 30, 2001
    Publication date: July 3, 2003
    Inventor: John F. Grubb
  • Publication number: 20030094218
    Abstract: A method for the manufacture of steel products and products thus produced, wherein steel is subjected to precipitation hardening in a martensitic structure subsequent to soft annealing and thereafter shaping. The method steps include shaping followed by solution annealing between 1200° C. and 1050° C., quenching from the solution annealing temperature with a quenching speed of at least 5° C. per second to a temperature below 500° C., subjecting said steel to an isothermal martensitic transformation and subsequently hardening the steel at a temperature between 450° C. and 550° C. to precipitate particles out from solution into said martensitic structure.
    Type: Application
    Filed: December 23, 2002
    Publication date: May 22, 2003
    Inventors: Jan-Olof Nilsson, Soren Olsson, Hubert Sjoerd Blaauw, Adriaan Van der Grijn
  • Patent number: 6485584
    Abstract: 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: Grant
    Filed: April 6, 1999
    Date of Patent: November 26, 2002
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Véronique Lambard, Ana Alamo, Jean-Louis Seran
  • Patent number: 6475310
    Abstract: A method for producing oxidation-resistant austenitic alloys for use at temperatures below 800° C. comprising of: providing an alloy comprising, by weight %: 14-18% chromium, 15-18% nickel, 1-3% manganese, 1-2% molybdenum, 2-4% silicon, 0% aluminum and the balance being iron; heating the alloy to 800° C. for between 175-250 hours prior to use in order to form a continuous silicon oxide film and another oxide film. The method provides a means of producing stainless steels with superior oxidation resistance at temperatures above 700° C.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: November 5, 2002
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: John S. Dunning, David E. Alman
  • Patent number: 6391253
    Abstract: The present invention provides a stainless steel being excellent in workability, corrosion resistance and antibacterial property. To be more specific, a stainless steel containing 10 wt % or more of Cr is rendered to contain 0.0001-1 wt % of Ag, or further one or more members selected from Sn: 0.0002-0.02 wt %, Zn: 0.0002-0.02 wt %, Pt: 0.0002-0.01 wt %, and, in addition, is rendered to dispersedly contain a total of 0.001 % or more in an area percentage of one or more members of a silver particle, a silver oxide and a silver sulphide each having a mean grain diameter of 500 &mgr;m or less. To disperse the silver particle, silver oxide and silver sulphide uniformly, the casting rate of continuous casting is preferably controlled to range from 0.8 to 1.6 m/min.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: May 21, 2002
    Assignee: Kawasaki Steel Corporation
    Inventors: Misako Tochihara, Takeshi Yokoto, Susumu Satoh, Sadao Hasuno
  • Patent number: 6340400
    Abstract: A stainless steel component comprising 0.8-1.4% carbon, 18-26 wt % chromium, 2-4 wt % nickel, 0-1 wt % molybdenum, 0 wt % lead and less than 0.6 wt % silicon provides for beneficial properties. Such a component may be prepared by the provision of an article from a steel starting material, and austenitizing the article between 800° C. and 1050° C. followed by hardening. In this process, the steel starting material comprises a powder.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: January 22, 2002
    Assignee: SKF Engineering & Research Centre B.V.
    Inventor: Xiao Bo Zhou
  • Patent number: 6338762
    Abstract: An austenitic stainless steel for use in engine gaskets having a high fatigue strength and resistance to settlement and method of manufacture thereof. The austenitic stainless steel is prepared by cold rolling at least 40%, annealing at a temperature of 700° C. to 900° C. followed by temper rolling with a reduction of at least 40%. The metal structure obtained by annealing is a recovered unrecrystallized structure or a mixed structure of a recovered unrecrystallized structure and a recrystallized structure. The austenitic stainless steel includes at most 0.03% C, at most 1.0% Si, at most 2.0% Mn, 16.0% to 18.0% Cr, 6.0% to 8.0% Ni and up to 0.20% N.
    Type: Grant
    Filed: May 3, 2000
    Date of Patent: January 15, 2002
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Naoto Sato, Kazuhiko Adachi, Kenichi Goshokubo, Takashi Katsurai, Shigeki Muroga
  • Patent number: 6306230
    Abstract: A method for producing hardened parts of steel from an air-hardening steel comprising the steps of heating the steel is heated to a temperature above 1,100° C., hot-working the steel parts until they reach the A1 emperature, cooling the steel parts in air to about 280° C. under simultaneous thermo-mechanical sizing treatment, then cooling the steel parts in air to room temperature, stress relief treating the steel parts at 150-250° C., and hard-machining the steel parts.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: October 23, 2001
    Assignee: SKF GmbH
    Inventor: Frank Hengerer
  • Patent number: 6245289
    Abstract: A refiner disk or disk segment cast from a stainless steel alloy having a composition of 0.2 percent to 0.6 percent carbon, 0.5 to 1.5 percent manganese, 0.5 percent to 1.5 percent silicon, a maximum of 0.05 percent sulfur, a maximum of 0.05 percent phosphorus, 14 percent to 18 percent chromium, 2 percent to 5 percent nickel, 2 percent to 4 percent copper, a maximum of 1 percent molybdenum, 1.5 percent to 5.0 percent niobium, a maximum of 1.5 percent vanadium, and a maximum of 0.5 percent total of at least one element selected from either rare earth metals and/or magnesium, the balance being iron. The niobium and vanadium form discrete carbides at high temperatures during the melting process. The rare earth metals and/or magnesium enhances the toughness of the disk by helping to shape the carbides and control them as discrete particles. Upon cooling, the carbides are preferably distributed evenly throughout the structure.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: June 12, 2001
    Assignee: J & L Fiber Services, Inc.
    Inventor: John Dodd
  • Patent number: 6136109
    Abstract: A high-Cr martensite steel pipe having excellent pitting resistance and method for manufacturing the same, which involves forming a pipe of steel including C: about 0.03 wt % or less, Si: about 0.5 wt % or less, Mn: about 0.5-3.0 wt %, Cr: about 10.0-14.0 wt %, Ni: about 0.2-2.0 wt %, Cu: about 0.2-1.0 wt % and N: about 0.03 wt % or less with the balance being Fe and incidental impurities, and having a value X shown as defined in the following formula (1) of about 12.2 or more. The pipe is quenched after austenitizing it at a temperature substantially equal to an A.sub.C3 point or higher, and the pipe is annealed in a temperature range from about 550.degree. C. or higher to a temperature lower than an A.sub.C1 point.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: October 24, 2000
    Assignee: Kawasaki Steel Corporation
    Inventors: Yukio Miyata, Mitsuo Kimura, Tomoya Koseki, Takaaki Toyooka, Fumio Murase
  • Patent number: 6106638
    Abstract: The subject of the invention is a process for manufacturing ferritic stainless steel strip, in which a strip of a ferritic stainless steel, of the type containing at most 0.12% of carbon, at most 1% of manganese, at most 1% of silicon, at most 0.040% of phosphorus, at most 0.030% of sulfur and between 16 and 18% of chromium, is solidified, directly from liquid metal, between two close-together, internally-cooled, counterrotating rolls with horizontal axes, wherein said strip is then cooled or left to cool so as to avoid making it remain within the austenite to ferrite and carbides transformation range, wherein said strip is coiled at a temperature of between 600.degree. C. and the martensitic transformation temperature Ms, wherein the coiled strip is left to cool at a maximum rate of 300.degree. C./h down to a temperature of between 200.degree. C. and ambient temperature and wherein said strip then undergoes box annealing.
    Type: Grant
    Filed: May 11, 1998
    Date of Patent: August 22, 2000
    Assignee: Usinor
    Inventors: Philippe Paradis, Philippe Martin
  • Patent number: 6053991
    Abstract: Disclosed are a cold working tool steel suitable for plastic cold working tools used under severe service conditions, such as forming dies, forming rolls, and form rolling dies, and a process for producing the same. The cold working tool steel has wear resistance and tensile compression fatigue strength and at the same time can provide improved die life. The cold working tool steel is characterized by comprising by weight 0.65 to 1.3% of carbon, not more than 2.0% of silicon, 0.1 to 2.0% of manganese, 5.0 to 11.0% of chromium, 0.7 to 5.0%, in terms of molybdenum equivalent (molybdenum+tungsten/2), of at least one member selected from molybdenum and tungsten, 0.1 to 2.5%, in terms of vanadium equivalent (vanadium+niobium/2), of at least one member selected from vanadium and niobium, and optionally 0.010 to 0.10% of sulfur with the balance consisting of iron and unavoidable impurities, an M.sub.7 C.sub.3 carbide having a grain diameter of 5 to 15 .mu.m being present in a percentage area of 1 to 9%.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: April 25, 2000
    Assignee: Sanyo Special Steel Co., Ltd.
    Inventors: Daien Yokoi, Nobuhiro Tsujii
  • Patent number: 5911842
    Abstract: A heat resisting steel whose metal structure is entirely martensite phase produced by tempering after quenching. The steel comprises, by weight, 0.05 to 0.20% C, not more than 0.15% Si, not more than 1.5% Mn, not more than 1.0% Ni, 8.5 to 13.0% Cr, not more than 3.50% Mo, not more than 3.5% W, 0.05 to 0.30% V, 0.01 to 0.20% Nb, not more than 5.0% Co, 0.001 to 0.020% boron, 0.005 to 0.040% nitrogen, 0.0005 to 0.0050% oxygen and 0.00001 to 0.0002% hydrogen. The steel has preferably not more than 10 of the Cr equivalent. The steel has 10 kgf/mm.sup.2 or more of 100,000 hours creep rupture strength at 650.degree. C.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: June 15, 1999
    Assignees: Hitachi, Ltd., The Japane Steel Works, Ltd.
    Inventors: Masao Shiga, Kishio Hidaka, Norio Yamada, Shigeyoshi Nakamura, Yutaka Fukui, Nobuo Shimizu, Ryoichi Kaneko, Yasuhiro Harada, Yasuo Watanabe, Toshio Fujita, Norio Morisada, Yasuhiko Tanaka
  • Patent number: 5912050
    Abstract: An improved process for chromizing commercial quantities of small, industrial, ferrous-based parts, such as but not limited to threaded connectors, pins, bolts, nuts, washers, fasteners, fittings, couplings, studs, etc., uses a retort filled with layers of parts coated with a chromium-containing slurry. The plurality of parts are arranged in layers on sheets of refractory felt paper and are heat treated simultaneously for causing the chromizing reaction between the slurry and the ferrous-based parts.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: June 15, 1999
    Assignees: McDermott Technology, Inc., The Babcock & Wilcox Company
    Inventors: Douglas D. Zeigler, James M. Tanzosh, Walter R. Mohn