With Working, Machining, Cutting, Or Post-carburizing And Post-nitriding Heating Or Quenching Patents (Class 148/219)
  • Patent number: 10428414
    Abstract: The present invention provides a carburized part having a total amount of TiC, AlN and ZrC, which are precipitate particles, of 4.5×10?10 mole or less per 1 mm2 of grain boundary area of prior austenite grains after carburization. According to the present invention, it is possible to provide a carburized part which allows effective inhibition of abnormal grain growth in spite of a carburizing treatment and makes it possible to solve the problem of reduction in properties caused by abnormal grain growth.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: October 1, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Kyohei Nakayama, Yasuaki Sakai, Toshiyuki Morita, Keisuke Inoue
  • Patent number: 10407763
    Abstract: The present disclosure provides a carbon steel composition for a reduced thermal strain steering rack bar and a method for manufacturing the carbon steel composition. The carbon steel composition for a steering rack bar includes: iron (Fe) as a main component, about 0.39 to 0.43 wt % of carbon (C), approximately 0.15 to 0.35 wt % of silicon (Si), approximately 0.90 to 1.10 wt % of manganese (Mn), approximately 0.02 to 0.04 wt % of niobium (Nb), and approximately 0.10 to 0.15 wt % of vanadium (V). The method for manufacturing a carbon steel composition for a steering rack bar includes: filling and drawing the carbon steel composition; broaching the filled and drawn carbon steel composition; performing nitriding heat-treatment on a surface of the broached carbon steel composition; and inspecting the nitriding heat-treated carbon steel composition.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: September 10, 2019
    Assignee: HYUNDAI MOTOR COMPANY
    Inventor: Hyun-Kyu Kim
  • Patent number: 10344370
    Abstract: A method of fabricating a nitrided low-alloy steel part, includes a) decarburizing the surface of a low-alloy steel part including at least one alloying element that is both nitride-forming and carbide forming in order to obtain a decarburized part presenting a carbon-depleted surface layer of thickness less than or equal to 1.5 mm, the minimum content of carbon by weight in the carbon-depleted surface layer being less than or equal to 70% of the carbon content by weight in the core of the decarburized part; b) treating the decarburized part with quenching treatment followed by annealing treatment; and c) nitriding the carbon-depleted surface layer in order to obtain a nitrided low-alloy steel part, step c) being performed after step b).
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: July 9, 2019
    Assignee: MESSIER-BUGATTI-DOWTY
    Inventors: Alain Viola, Nicolas Binot
  • Patent number: 9957595
    Abstract: A carburized alloy steel includes, based on a total weight of the carburized alloy steel, 0.1 to 0.35 wt % carbon, 0.1 to 2.0 wt % silicon, 0.1 to 1.5 wt % manganese, 1.5 to 3.0 wt % chromium, 0.2 to 0.5 wt % molybdenum, greater than 0 to 0.07 wt % niobium, and a balance of iron.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: May 1, 2018
    Assignee: HYUNDAI MOTOR COMPANY
    Inventors: Sung-Chul Cha, Moon-Ki Bae, Seung-Hyun Hong, Si-Yup Lee
  • Patent number: 9834837
    Abstract: A method for heat treating a steel component, which comprises the steps of: (a) carburizing the steel component with a carbon potential above 1.0, (b) carburizing the steel component with a carbon potential above 0.6, (c) quenching the steep component, and (d) subjecting the steel component to a bainitic treatment.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: December 5, 2017
    Assignee: AKTIEBOLAGET SKF
    Inventors: Staffan Larsson, Walter Datchary, Peter Neuman
  • Patent number: 9297738
    Abstract: A system comprising at least one component for an application in which the at least one component is subjected to Hertzian stress or alternating Hertzian stress or altering Hertzian stress in combination with structural stress, and at least one sensor that is arranged in situ to monitor atomic hydrogen permeation through at least part of the at least one component.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: March 29, 2016
    Assignee: AKTIEBOLAGET SKF
    Inventor: Ingemar Strandell
  • Publication number: 20150132079
    Abstract: A method for method for solution hardening of a cold deformed workpiece of a passive alloy containing at least 10% chromium, which method includes dissolving at least nitrogen in the workpiece at a temperature T1, which is higher than the solubility temperature for carbide and/or nitride and lower than the melting point of the passive alloy, wherein dissolution of nitrogen at temperature T1 is performed to obtain a diffusion depth in the range of 50 ?m to 5 mm, and cooling the workpiece after the dissolution step at temperature T1 to a temperature which is lower than the temperature at which carbides and/or nitrides form in the passive alloy, wherein the cooling step takes place in an inert gas not containing nitrogen. Further, a member, such as a lock washer for securing bolts or nuts prepared using the method.
    Type: Application
    Filed: April 25, 2013
    Publication date: May 14, 2015
    Inventors: Thomas Lundin Christiansen, Thomas Strabo Hummelshoj, Marcel A.J. Somers
  • Publication number: 20150101710
    Abstract: A method for the low-pressure carbonitriding of steel parts, in particular parts used in the manufacture of automobiles, comprises a heating step that includes a simple heating phase (M) followed by an initial nitridation phase (Ni) from a temperature between 700° C. to 750° C. to a temperature between 860° and 1000° C. and carried out using a reduced temperature gradient relative to the simple heating phase. Additionally, alternate cementing (C1-Cn) and nitridation (N1-Nn) steps are performed at constant temperature, wherein the final nitridation step is accompanied with a decrease in temperature immediately before quenching (T).
    Type: Application
    Filed: October 8, 2012
    Publication date: April 16, 2015
    Applicant: EMC Technologies
    Inventors: Philippe Lapierre, Jerome Lardinois, Yves Giraud, Alfred Rallo
  • Patent number: 8940109
    Abstract: A method for manufacturing a base material for a wave gear which enables the effective suppression of man-hours and manufacturing cost while providing the required strength and elastic deformation characteristics for an external gear of a wave gear. In this manufacturing method, steel having a carbon content of 0.48% or less is subjected to primary molding by being cold worked into the shape of an external gear for a wave gear. The resulting primary molded article is heated to a temperature range in which the main phase of the metallographic structure thereof forms an austenitic structure. The main phase of the metallographic structure is formed into bainite by carrying out quenching to a predetermined temperature higher than the martensitic transformation starting temperature and maintaining the temperature for a predetermined time. The product is then cooled to normal temperature.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: January 27, 2015
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Eiri Nagata, Nobuaki Kurita
  • Publication number: 20140348454
    Abstract: An outer ring, an inner ring, and a ball, each of which is a bearing part, are made of a quench-hardened steel containing not less than 0.90 mass % and not more than 1.05 mass % of carbon, not less than 0.15 mass % and not more than 0.35 mass % of silicon, not less than 0.01 mass % and not more than 0.50 mass % of manganese, and not less than 1.30 mass % and not more than 1.65 mass % of chromium with the rest consisting of an impurity. A contact surface thereof with another part has a nitrogen concentration of not less than 0.25 mass %. A remaining austenite amount in the contact surface is not less than 6 volume % and not more than 12 volume %.
    Type: Application
    Filed: December 7, 2012
    Publication date: November 27, 2014
    Applicant: NTN CORPORATION
    Inventors: Takashi Ueno, Chikara Ohki, Daisuke Sato, Kyouhei Kageyama, Shougo Shimizu
  • Publication number: 20140338795
    Abstract: The invention relates to a method for manufacturing a titanium alloy having superelastic properties and/or shape memory for biomedical use, which comprises the steps of: preparing an ingot by melting the various metals that form the desired alloy in a vacuum; optionally homogenizing the ingot in a vacuum by high-temperature annealing (higher than 900° C.); first quenching; mechanical shaping (rolling, drawing, machining or the like); heat treatment for redissolution in beta phase beyond the beta transus temperature (until a second temperature and then maintaining same for a certain time); and second quenching; characterized in that said heat treatment phase is carried out in a gaseous atmosphere and also constitutes a surface treatment suitable for forming on the surface a layer of nitride, carbonitride, oxide, oxynitride or the like.
    Type: Application
    Filed: November 7, 2012
    Publication date: November 20, 2014
    Applicant: INSTITUT NATIONAL DES SCIENCES APPLIQUEES DE RENNES
    Inventors: Thierry Gloriant, Doina Gordin
  • Publication number: 20140326365
    Abstract: Provided is a method of manufacturing a nitrocarburized crankshaft which is obtained by subjecting a bainitic microalloyed steel to a forging and a machining, and further subjecting the bainitic microalloyed steel to at least a strain releasing heat treatment and a subsequent nitrocarburizing treatment, the bainitic microalloyed steel containing, as essentially added elements, in terms of mass %: 0.10% to 0.40% of C; 0.10% to 1.0% of Si; 1.0% to 2.0% of Mn; 0.05% to 0.40% of Mo; and 0.05% to 0.40% of V, and the bainitic microalloyed steel optionally further containing, as arbitrarily added elements, in terms of mass %: 0.01% to 0.1% of S; 0.005% to 0.2% of Ti; 0.001% to 0.03% of Al; 0.50% or less of Cr; 0.5% or less of Cu; and 0.5% or less of Ni, with the balance being Fe and unavoidable impurities.
    Type: Application
    Filed: April 28, 2014
    Publication date: November 6, 2014
    Applicants: DAIDO STEEL CO., LTD., HONDA MOTOR CO., LTD.
    Inventors: Hiroki MASUDA, Hideki MATSUDA, Ayumi YAMAZAKI, Shinichiro KATO, Takahiro MIYAZAKI
  • Publication number: 20140321789
    Abstract: An outer ring, an inner ring and a ball are each constituted of steel containing at least 0.60 mass % and not more than 1.50 mass % of carbon, at least 0.15 mass % and not more than 2.50 mass % of silicon, at least 0.30 mass % and not more than 1.50 mass % of manganese, and at least 0.20 mass % and not more than 2.00 mass % of chromium with the rest consisting of an impurity. A nitrogen concentration in surface layer portions is at least 0.3 mass %. An average quantity of residual austenite as a whole in each of the outer ring, the inner ring and the ball is not more than 20 volume %.
    Type: Application
    Filed: December 4, 2012
    Publication date: October 30, 2014
    Applicant: NTN CORPORATION
    Inventors: Daisuke Sato, Chikara Ohki, Takashi Ueno, Yasutaka Kusumi
  • Publication number: 20140305548
    Abstract: A method for producing a case-hardened martensitic stainless steel article includes: providing an article comprised, at least in part, of a martensitic stainless steel, carburizing the article within a temperature range of 1625° F.-1680° F. (885° C.-916° C.), and then carbo-nitriding the article within a temperature range of 1575° F.-1625° F. (857° C.-885° C.). An article, such as a bearing ring, comprising such a case-hardened martensitic stainless steel is also disclosed.
    Type: Application
    Filed: May 31, 2012
    Publication date: October 16, 2014
    Applicants: AKTIEBOLAGET SKF, MIDWEST THERMAL-VAC INC., UES INC.
    Inventors: Hitesh K. Trivedi, Frederick J. Otto, Timothy W. Piazza, Bryan A. McCoy, Rabi S. Bhattacharya
  • Publication number: 20140299218
    Abstract: A process for manufacturing a bellows, made of austenitic high-grade steel with high compressive strength and fatigue strength, forms a single-layer or multilayer sleeve into a bellows with hydraulic forming. The pressure resistance and fatigue strength are improved by the bellows being cleaned after the forming and by the bellows being exposed to a surrounding area containing carbon and/or nitrogen atoms at temperatures between 100° C. and 400° C., preferably 200° C. to 320° C. With this a hardening of the bellows takes place by means of the diffusing in of carbon and/or nitrogen atoms. A bellows made of austenitic high-grade steel with one or more layers created in this manner has the edge layer hardened by the incorporation of carbon and/or nitrogen atoms up to a hardening depth of at least 5% of the wall thickness.
    Type: Application
    Filed: April 8, 2014
    Publication date: October 9, 2014
    Applicant: BOA Balg-und Kompensatoren-Technologie GmbH
    Inventors: Klaus HIRTH, Immo GÄRTNER, Jürgen TELATINSKI, Uwe WILD
  • Publication number: 20140290800
    Abstract: A method for the low-pressure carbonitriding of steel parts, in particular parts used in the manufacture of automobiles comprises a heating step that includes a simple heating phase (M) followed by an initial nitridation phase (Ni) from a temperature between 700° C. to 750° C. to a temperature between 860° and 1000° C. carried out using a reduced temperature gradient relative to the simple heating phase. The method further includes alternate cementing (C1-Cn) and nitridation (N1-Nn) steps at constant temperature, wherein the final nitridation step is accompanied with a decrease in temperature immediately before quenching (T).
    Type: Application
    Filed: October 8, 2012
    Publication date: October 2, 2014
    Inventors: Philippe Lapierre, Jerome Lardinois, Yves Giraud, Alfred Rallo
  • Publication number: 20140254736
    Abstract: A method for producing a wear-resistant and corrosion-resistant stainless steel part for a nuclear reactor is provided. This method includes steps of providing a tubular blank in austenitic stainless steel whose carbon content is equal to or lower than 0.03% by weight; shaping the blank; finishing the blank to form the cladding; hardening the outer surface of the cladding by diffusing one or more atomic species; the blank, before the providing step or during the shaping or finishing step, being subjected to at least one solution annealing with sub-steps of: heating the blank to a sufficient temperature and for a sufficient time to solubilise any precipitates present; quenching the blank at a rate allowing the austenitic structure to be maintained in a metastable state at ambient temperature and free of precipitates.
    Type: Application
    Filed: September 28, 2012
    Publication date: September 11, 2014
    Inventor: Dominique Hertz
  • Patent number: 8808469
    Abstract: It is devised to further enhance strength and straightening ability of a nitrocarburized raw material for crankshafts. A nitrocarburized raw material for crankshafts is formed so as to have a composition composed of C, Si, Mn, Cu, Ni, Cr, V, S, s-Al, Ca and N in prescribed % by mass, with the balance being Fe and inevitable impurities and having a structure of ferrite+pearlite; after smelting a steel having the foregoing composition, hot forging is performed; thereafter, a normalizing treatment is applied to the subject hot forged material at a treatment temperature in the range of from 780° C. to 850° C.; and straightening process for correcting bending to be caused due to the nitrocarburizing treatment is later applied.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: August 19, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Satoru Suwa, Daiji Kawaguchi, Atsushi Murakami
  • Publication number: 20140099051
    Abstract: A steel material which contains 0.16 to 0.19% of carbon by mass, 0.15 to 0.35% of silicon by mass, 0.20 to 1.55% of manganese by mass, and 2.5 to 3.2% of chromium by mass, of which remaining part is formed of iron and incidental impurities, and which contains 0.01 to 0.2% of nickel by mass as an incidental impurity and higher than or equal to 0.001% and lower than 0.15% of molybdenum by mass as an incidental impurity, and which has a hardenability index of higher than or equal to 5.4 is subjected to a carbonitriding step, a process annealing step, a quenching step, a tempering step and a finishing step. Thus, there is obtained a rolling sliding member made of the steel material, and having satisfactory corrosion resistance and crack resistance and having a sufficiently long useful life even under an environment where rust is easily formed.
    Type: Application
    Filed: September 30, 2013
    Publication date: April 10, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Wataru YOSHIDA, Katsuhiko KIZAWA
  • Publication number: 20140041762
    Abstract: Method for heat treating a steel component (28, 36) to provide the steel component (28, 36) with a surface having improved wear resistance. The method comprises the steps of carbonitriding the steel component (28, 36) at a temperature of 930-970° C., cooling the steel component (28, 36), re-heating the steel component (28, 36) to a temperature of 780-820° C. and either quenching the steel component (28, 36) to form martensite and tempering, or quenching the steel component (28, 36) to form bainite and tempering.
    Type: Application
    Filed: April 4, 2012
    Publication date: February 13, 2014
    Inventors: Staffan Larsson, Peter Neuman
  • Publication number: 20140041763
    Abstract: Provided is a gas nitrocarburizing method forming a nitride layer in a surface layer portion of a workpiece made of steel by heating the workpiece within a heat treatment furnace into which a heat treatment gas is introduced, the heat treatment gas containing ammonia gas and at least one of carbon dioxide gas and hydrogen gas, and having a remainder formed of an impurity.
    Type: Application
    Filed: April 9, 2012
    Publication date: February 13, 2014
    Applicant: NTN CORPORATION
    Inventor: Chikara Ohki
  • Patent number: 8585833
    Abstract: Ferritic nitrocarburized surface treatment of cast iron brake rotors providing oxidation resistance, good braking performance and absence of distortion. Machined brake rotors are pre-heated, then immersed into a high temperature molten nitrocarburizing salt bath for a first predetermined dwell time. After removing the brake rotors from the nitrocarburizing salt bath, the brake rotors are directly immersed into an oxidizing salt bath at a lower temperature than the nitrocarburizing salt bath so that the brake rotors are thermally quenched. After a predetermined second dwell time in the oxidizing salt bath, the brake rotors are removed therefrom and further cooled to room temperature, either by water application thermal quenching or slow cooling in air. A fixture provides stable holding the brake rotors with a minimum of contact during placement in the salt baths.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: November 19, 2013
    Assignees: GM Global Technology Operations LLC, Kolene Corporation
    Inventors: Michael L. Holly, Douglas N. Reed, James R. Easterday
  • Publication number: 20130213526
    Abstract: A braiding machine is provided comprising a support member, a series of drivers carried by the support member arranged in a circle around a braiding point, a mechanism to rotate adjacent of the drivers in opposite directions, a series of strand supply carrier spindles, and a plurality of cars for mounting of an associated spindle to be driven by the drivers for travel in serpentine intersecting paths in opposite directions around the braiding point. Each of the plurality of cars comprises a unitary central post, a mounting base, and a foot. The post extends from a bottom plane surface of the foot through the foot and the mounting base. The foot and the mounting base are spaced from one another and both provide support to the post.
    Type: Application
    Filed: April 2, 2013
    Publication date: August 22, 2013
    Inventor: Simon Arden DeYoung
  • Publication number: 20130180626
    Abstract: A steel for surface hardening for machine structural use which is characterized by containing, in terms of mass %, 0.30-0.60% C, 0.02-2.0% Si, 0.35-1.5% Mn, 0.001-0.5% Al, 0.05-2.0% Cr, 0.001-1.0% Sn, 0.0001-0.021% S, 0.0030-0.0055% N, 0.01-2.0% Ni, 0.01-2.0% Cu, up to 0.030% P, and up to 0.005% O, with the remainder comprising Fe and incidental impurities, the contents of Sn, Cu, Ni, Mn, and S satisfying relationships (1) and (2). ?0.19?0.12×Sn+Cu?0.1×Ni?0.
    Type: Application
    Filed: August 2, 2011
    Publication date: July 18, 2013
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Suguru Yoshida
  • Patent number: 8475605
    Abstract: In the steel for a surface layer hardening which is treated with carburizing in a temperature range of 800° C. to 900° C., chemical composition thereof contains, by mass %, C: 0.10% to 0.60%, Si: 0.01% to 2.50%, Mn: 0.20% to 2.00%, S: 0.0001% to 0.10%, Cr: 2.00% to 5.00%, Al: 0.001% to 0.50%, N: 0.0020% to 0.020%, P: 0.001% to 0.050%, and O: 0.0001% to 0.0030%; the remaining portion thereof includes Fe and unavoidable impurities; and the total amount of Cr, Si, and Mn satisfies, by mass %, 2.0?Cr+Si+Mn?8.0.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: July 2, 2013
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Manabu Kubota, Tatsuro Ochi
  • Publication number: 20130146180
    Abstract: A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and a TiC precipitation parameter.
    Type: Application
    Filed: February 8, 2012
    Publication date: June 13, 2013
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Manabu Kubota
  • Publication number: 20130146181
    Abstract: A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and an AlN precipitation parameter.
    Type: Application
    Filed: February 8, 2012
    Publication date: June 13, 2013
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Manabu Kubota
  • Patent number: 8425690
    Abstract: A bearing part comprising steel subjected to carbonitriding at a carbonitriding temperature exceeding the A1 transformation temperature, and cooled to a temperature lower than the A1 transformation temperature. The steel is reheated to a temperature for quenching that is not lower than the A1 transformation temperature but lower than the carbonitriding temperature, and then quenched.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: April 23, 2013
    Assignee: NTN Corporation
    Inventor: Chikara Ohki
  • Patent number: 8407978
    Abstract: A method for producing pins for a control chain, which has link plates that are connected to each other by the pins. The pin ends are arranged in receiving bores arranged inside the link plates. The pin is made of steel of the type 100Cr6 or 32MnCrMo6-4-3, subjected to a carbonitriding method and has a wear zone between the 1/30 and the 1/60 part of the diameter thereof after abrasive removal on the carbonitrited pin surface.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: April 2, 2013
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Klaus Hahn, Bolko Schuseil
  • Publication number: 20130000788
    Abstract: A method for manufacturing a base material for a wave gear which enables the effective suppression of man-hours and manufacturing cost while providing the required strength and elastic deformation characteristics for an external gear of a wave gear. In this manufacturing method, steel having a carbon content of 0.48% or less is subjected to primary molding by being cold worked into the shape of an external gear for a wave gear. The resulting primary molded article is heated to a temperature range in which the main phase of the metallographic structure thereof forms an austenitic structure. The main phase of the metallographic structure is formed into bainite by carrying out quenching to a predetermined temperature higher than the martensitic transformation starting temperature and maintaining the temperature for a predetermined time. The product is then cooled to normal temperature.
    Type: Application
    Filed: March 14, 2011
    Publication date: January 3, 2013
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Eiri Nagata, Nobuaki Kurita
  • Publication number: 20130000787
    Abstract: Ferritic nitrocarburized surface treatment of cast iron brake rotors providing oxidation resistance, good braking performance and absence of distortion. Machined brake rotors are pre-heated, then immersed into a high temperature molten nitrocarburizing salt bath for a first predetermined dwell time. After removing the brake rotors from the nitrocarburizing salt bath, the brake rotors are directly immersed into an oxidizing salt bath at a lower temperature than the nitrocarburizing salt bath so that the brake rotors are thermally quenched. After a predetermined second dwell time in the oxidizing salt bath, the brake rotors are removed therefrom and further cooled to room temperature, either by water application thermal quenching or slow cooling in air. A fixture provides stable holding the brake rotors with a minimum of contact during placement in the salt baths.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 3, 2013
    Applicants: KOLENE CORPORATION, GM Global Technology Operations LLC
    Inventors: Michael L. Holly, Douglas N. Reed, James R. Easterday
  • Publication number: 20120318407
    Abstract: A surface treatment method for a steel material includes carbonitriding, quenching, and tempering. The steel material consists of, by weight %, 0.27 to 0.48% of C, 0.01 to 2.2% of Si, 0.30 to 1.0% of Mn, not more than 0.035% of P, not more than 0.035% of 8, and the balance of Fe and inevitable impurities. The carbonitriding step is performed by heating the steel at a temperature of not less than the A3 point and not more than 1100° C. and bringing the steel into contact with a mixed gas atmosphere so as to concentrate nitrogen and carbon at a surface layer of the steel. The quenching step is performed by cooling the steel to room temperature at a rate of not less than 20° C./second. The tempering step is performed by heating the steel at a temperature of 100 to 400° C.
    Type: Application
    Filed: March 18, 2011
    Publication date: December 20, 2012
    Applicant: NHK SPRING CO., LTD.
    Inventors: Takeshi Suzuki, Yoshiki Ono, Shimpei Kurokawa
  • Patent number: 8332998
    Abstract: A method of shot peening in which with respect to a carburized and quenched metal part, only its surface abnormal layer detrimental to the fatigue strength thereof is scraped without scraping of the martensitic structure underlying the surface abnormal layer, namely, in which the fatigue strength can be rendered stable and enhanced without surface cracking. As bombardment shot, use is made of a shot with hardness higher than that (first hardness) of the surface abnormal layer occurring at a surface layer portion of metal part prior to shot peening but lower than that (second hardness) of the martensitic structure.
    Type: Grant
    Filed: August 25, 2006
    Date of Patent: December 18, 2012
    Assignee: Sintokogio, Ltd.
    Inventor: Yuji Kobayashi
  • Publication number: 20120211122
    Abstract: A method for producing a carbonitrided member comprising the steps of carburizing a steel part having a composition of, by mass percent, C: 0.10 to 0.35%, Si: 0.15 to 1.0%, Mn: 0.30 to 1.0%, Cr: 0.40 to 2.0%, S: 0.05% or less with the balance being Fe and impurities in a carburizing atmosphere of 900 to 950° C. The carburized steel part is carbonitrided in a carbonitriding atmosphere with the temperature of 800 to 900° C. and the nitrogen potential of 0.2 to 0.6%. The carbonitrided steel part is qhenched and then shot peened. The shot peening treatment may be further performed while heating to a temperature not higher than 350° C. or immediately after heating to a temperature not higher than 350° C. After quenching, the shot peening treatment may be further performed after tempering in the temperature range exceeding 250° C. and not higher than 350° C.
    Type: Application
    Filed: March 8, 2012
    Publication date: August 23, 2012
    Applicants: HONDA MOTOR CO., LTD., SUMITOMO METAL INDUSTRIES, LTD.
    Inventors: Naoyuki SANO, Masayuki HORIMOTO, Yoshinari OKADA, Masaki AMANO, Akihito NINOMIYA
  • Patent number: 8123872
    Abstract: A process by which a nickel-based superalloy substrate prone to deleterious reactions with an aluminum-rich coating can be stabilized by carburization. The process generally entails processing the surface of the substrate to be substantially free of oxides, heating the substrate in a non-oxidizing atmosphere to a carburization temperature, and then contacting the surface of the substrate with a carburization gas mixture comprising a diluted low activity hydrocarbon gas while maintaining the substrate at the carburization temperature. While at the carburization temperature and contacted by the carburization gas, carbon atoms in the carburization gas dissociate therefrom, transfer onto the surface of the substrate, diffuse into the substrate, and react with refractory metals within the substrate to form refractory metal carbides within a carburized region beneath the surface of the substrate. The substrate is then cooled in a non-oxidizing atmosphere to terminate carbide formation.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: February 28, 2012
    Assignee: General Electric Company
    Inventors: Brian Thomas Hazel, Ming Fu
  • Publication number: 20120018050
    Abstract: In the steel for a surface layer hardening which is treated with carburizing in a temperature range of 800° C. to 900° C., chemical composition thereof contains, by mass %, C: 0.10% to 0.60%, Si: 0.01% to 2.50%, Mn: 0.20% to 2.00%, S: 0.0001% to 0.10%, Cr: 2.00% to 5.00%, Al: 0.001% to 0.50%, N: 0.0020% to 0.020%, P: 0.001% to 0.050%, and O: 0.0001% to 0.0030%; the remaining portion thereof includes Fe and unavoidable impurities; and the total amount of Cr, Si, and Mn satisfies, by mass %, 2.0?Cr+Si+Mn?8.0.
    Type: Application
    Filed: February 18, 2011
    Publication date: January 26, 2012
    Applicant: JX Nippon Mining & Metals Corporation
    Inventors: Manabu Kubota, Tatsuro Ochi
  • Publication number: 20110243488
    Abstract: There is provided a bearing constituent member capable of achieving a long life of a rolling bearing and securing sufficient static loading capacity and dimensional stability and a production process thereof as well as a rolling bearing having a long life and exhibiting sufficient static loading capacity and dimensional stability. A workpiece obtained from a steel containing 3.2 to 5.0% by mass of Cr and 0.05% by mass or more to less than 0.5% by mass of V is subjected to a heat treatment such as a carbonitriding treatment. Thereby, the following are achieved: the content of C in the surface layer ranging from the surface of the bearing constituent member of the rolling bearing to 10 ?m is 1.1 to 1.6% by mass, Vickers hardness at the position of a depth of 50 ?m from the surface is 740 to 900 (Rockwell C hardness is 62 to 67), the ? amount at the position of a depth of 10 ?m from the surface is 20 to 55% by volume, particles composed of vanadium nitride having a particle diameter of 0.
    Type: Application
    Filed: December 11, 2009
    Publication date: October 6, 2011
    Applicants: Optoelectronics Co., Ltd., Opticon, Inc
    Inventors: Katsuhiko Kizawa, Tsuyoshi Mikami, Kentarou Ono, Chikara Nakajima
  • Publication number: 20110226386
    Abstract: A steel characterized in that its composition is percentages by weight: C=0.18-0.30% Co=1.5-4% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=traces-0.3% Nb=traces-0.1% B=traces-30 ppm Ni=11-16% where Ni?7+3.5 Al Si=traces-1.0% Mn=traces-4.0% Ca=traces-20 ppm Rare earths=traces-100 ppm if N?10 ppm, Ti+Zr/2=traces-100 ppm where Ti+Zr/2?10 N if 10 ppm<N?20 ppm, Ti+Zr/2=traces-150 ppm O=traces-50 ppm N=traces-20 ppm S=traces-20 ppm Cu=traces-1% P=traces-200 ppm the remainder being iron and inevitable impurities resulting from the smelting. A process for manufacturing a part from this steel, and part thus obtained.
    Type: Application
    Filed: July 8, 2009
    Publication date: September 22, 2011
    Inventor: François Roch
  • Publication number: 20110017351
    Abstract: It is devised to further enhance strength and straightening ability of a nitrocarburized raw material for crankshafts. A nitrocarburized raw material for crankshafts is formed so as to have a composition composed of C, Si, Mn, Cu, Ni, Cr, V, S, s-Al, Ca and N in prescribed % by mass, with the balance being Fe and inevitable impurities and having a structure of ferrite+pearlite; after smelting a steel having the foregoing composition, hot forging is performed; thereafter, a normalizing treatment is applied to the subject hot forged material at a treatment temperature in the range of from 780° C. to 850° C.; and straightening process for correcting bending to be caused due to the nitrocarburizing treatment is later applied.
    Type: Application
    Filed: February 25, 2009
    Publication date: January 27, 2011
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Satoru Suwa, Daiji Kawaguchi, Atsushi Murakami
  • Patent number: 7877159
    Abstract: The production history information management apparatus 100 comprises: machining an identifier for identifying a pipe or tube in a region of the pipe or tube on which thread cutting is to be performed before an initial production process is performed among production processes which are management targets of the production history information; reading the identifier machined on the pipe or tube before each of the production processes is performed or while each of the production processes is performed; management for storing the production history information of the pipe or tube obtained in each of the production processes and the identifier read from the pipe or tube while the production history information and the identifier are associated with each other; and thread cutting for removing the identifier machined on the pipe or tube in the process of performing the thread cutting on the end portions of the pipe or tube among the production processes which are management targets of the production history inform
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: January 25, 2011
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventor: Mutsumi Tanida
  • Publication number: 20110000583
    Abstract: A rolling part formed by performing spheroidizing annealing, processing, carbonitriding and finishing on a steel material containing C in an amount of 0.90 mass % to 1.10 mass %, Si in an amount of more than 0.35% and up to 0.70%, Mn in an amount of less than 0.80 mass %, Cr in an amount of 1.85 mass % to 2.50 mass %, O in an amount of 12 ppm or less, and the balance of Fe and unavoidable impurities. The mean C amount on a surface is from 1.20 mass % to 1.50 mass %, and the mean N amount is from 0.10 mass % to 0.60 mass %. Deposits having a particle size of 0.1 ?m or more on the surface have a mean particle size of 0.6 ?m or less, exist as 700,000 particles or more per mm2, and have an area ratio of 10% or more. The amount of retained austenite of the surface is from 25% to 45% by volume ratio. The hardness of the surface is Hv 750 or more. The inside of the rolling part has an amount of retained austenite of 20% or less by volume ratio.
    Type: Application
    Filed: March 9, 2009
    Publication date: January 6, 2011
    Inventors: Katsuhiko Kizawa, Tomoaki Nishikawa, Takeshi Udagawa
  • Patent number: 7828910
    Abstract: High toughness, high strength alloys are thermochemically processed by performing concurrent bulk alloy heat treatment and surface engineering processing. The concurrent steps can include high temperature solutionizing together with carburizing and tempering together with nitriding.
    Type: Grant
    Filed: December 9, 2005
    Date of Patent: November 9, 2010
    Assignee: United Technologies Corporation
    Inventors: Raymond C. Benn, Clark V. Cooper
  • Publication number: 20100276036
    Abstract: A process by which a nickel-based superalloy substrate prone to deleterious reactions with an aluminum-rich coating can be stabilized by carburization. The process generally entails processing the surface of the substrate to be substantially free of oxides, heating the substrate in a non-oxidizing atmosphere to a carburization temperature, and then contacting the surface of the substrate with a carburization gas mixture comprising a diluted low activity hydrocarbon gas while maintaining the substrate at the carburization temperature. While at the carburization temperature and contacted by the carburization gas, carbon atoms in the carburization gas dissociate therefrom, transfer onto the surface of the substrate, diffuse into the substrate, and react with refractory metals within the substrate to form refractory metal carbides within a carburized region beneath the surface of the substrate. The substrate is then cooled in a non-oxidizing atmosphere to terminate carbide formation.
    Type: Application
    Filed: December 27, 2006
    Publication date: November 4, 2010
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Brian Thomas Hazel, Ming Fu
  • Publication number: 20100242785
    Abstract: A car wash dolly of the type used in connection with multi-tier car wash conveyors comprises, in mirror image arrangement, first and second pairs of stainless steel journals having external bearing surfaces and polymeric rollers mounted for rotation on said bearing surfaces wherein the journals are nitro carburized and mechanically polished prior to assembly.
    Type: Application
    Filed: March 26, 2009
    Publication date: September 30, 2010
    Applicant: BELANGER, INC.
    Inventor: Barry S. TURNER
  • Publication number: 20100200119
    Abstract: Steel, characterised in that the composition thereof is, in percentages by weight: C=0.20-0.30% Co=trace levels-1% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=trace levels-0.3% Nb=trace levels-0.1% B=trace levels-30 ppm Ni=11-16% with Ni?7+3.5 Al Si=trace levels-1.0% Mn=trace levels-2.0% Ca=trace levels-20 ppm rare earths=trace levels-100 ppm if N?10 ppm, Ti+Zr/2=trace levels-100 ppm with Ti+Zr/2?10 N if 10 ppm<N?20 ppm, Ti+Zr/2=trace levels-150 ppm O=trace levels-50 ppm N=trace levels-20 ppm S=trace levels-20 ppm Cu=trace levels-1% P=trace levels-200 ppm the remainder being iron and inevitable impurities resulting from the production operation. Method of producing a component from this steel and a component obtained in this manner.
    Type: Application
    Filed: June 18, 2008
    Publication date: August 12, 2010
    Applicant: AUBERT & DUVAL
    Inventor: Jacques Montagnon
  • Patent number: 7641742
    Abstract: There is provided a rolling bearing which has long life against rolling fatigue and exhibits no decrease in fracture strength and no increase in rate of dimensional change over time, even if the part size thereof is large, and which can obtain higher strength by crystal grains being further refined, if it has a size equal to or smaller than a prescribed size. The rolling bearing according to the present invention includes a race and a rolling element. At least one member of the race and the rolling element has a nitrogen-enriched layer in its surface layer, and a surface layer portion contains austenite crystal grains having a grain size number of at least 11. The member has hardenability allowing a position exhibiting HRC50 in a hardenability test method for steel to be apart from a quenched end by a distance of at least 12.7 mm ( 8/16 inch).
    Type: Grant
    Filed: January 11, 2005
    Date of Patent: January 5, 2010
    Assignee: NTN Corporation
    Inventors: Chikara Ohki, Kohei Fujita
  • Patent number: 7621201
    Abstract: A ferrous metal tool is provided for the forming of light metal sheet workpieces at elevated temperatures, with the forming surface of the tool prepared to minimize friction and adhesion when engaged in deformation of the hot sheet metal. The forming surface of a steel tool is nitrocarburized to form a compound layer and diffusion layer on the surface. The compound layer initially comprises an outer gamma-phase material and an underlying epsilon phase material. Gamma-phase material is removed to expose underlying epsilon phase material, and low friction particles are embedded in the modified nitrocarburized compound layer of the forming tool.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: November 24, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventor: Michael D. Hanna
  • Publication number: 20090276992
    Abstract: A method for manufacturing a raceway member, in which a hardness of a region to be plastically deformed is controllable in a stable manner and a sufficient rolling contact fatigue life is ensured by making a hardness of a region including a raceway surface sufficiently high, while suppressing increase in the manufacturing cost, includes a steel member preparation step, a heat treatment step, and a finishing step. The heat treatment step includes: a carbonitriding step, in which the steel member is heated to a carbonitriding temperature, which is a temperature not lower than A1 point, and carbonitrided; a temperature holding step, in which the steel member is cooled from the carbonitriding temperature to a temperature range between not lower than a temperature 100° C.
    Type: Application
    Filed: June 11, 2007
    Publication date: November 12, 2009
    Inventors: Kikuo Maeda, Hirokazu Nakashima
  • Publication number: 20090223275
    Abstract: A ferrous metal tool is provided for the forming of light metal sheet workpieces at elevated temperatures, with the forming surface of the tool prepared to minimize friction and adhesion when engaged in deformation of the hot sheet metal. The forming surface of a steel tool is nitrocarburized to form a compound layer and diffusion layer on the surface. The compound layer initially comprises an outer gamma-phase material and an underlying epsilon phase material. Gamma-phase material is removed to expose underlying epsilon phase material, and low friction particles are embedded in the modified nitrocarburized compound layer of the forming tool.
    Type: Application
    Filed: March 5, 2008
    Publication date: September 10, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventor: Michael D. Hanna
  • Patent number: 7582170
    Abstract: A process for the low-wear micromachining of workpieces made from metal or metal alloys, in particular steel, in which a workpiece (1) is micromachined using at least one machining apparatus (5) that has a diamond tool (6), in particular an ultraprecision turning, milling or grinding machine, and prior to the micromachining the workpiece (1), in a first step, is subjected to a thermochemical surface zone treatment, and that in a second step the thermochemically treated surface zone (2) of the workpiece (1) is machined using the machining apparatus (5).
    Type: Grant
    Filed: June 12, 2004
    Date of Patent: September 1, 2009
    Assignee: Stiftung Institut fur Werkstofftechnik
    Inventors: Juan Dong, Ralf Gläbe, Andreas Mehner, Ekkard Brinksmeier, Peter Mayr