With Working, Machining, Or Cutting Patents (Class 148/226)
  • Patent number: 10632524
    Abstract: A near-net shape forming method for fabricating the precise bearing ring forging is invented. The processing method is composed of following three procedures. (1) the precise ring-like billet with chamfer angle is manufactured by the machining method. (2) The billet is heated by the less oxidation or non-oxidation heating method before ring rolling. (3) The bearing ring forging integrating with the raceway is formed in one pass of the rolling process by the ring rolling method.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: April 28, 2020
    Assignee: Shanghai Dianji University
    Inventor: Lei Li
  • Patent number: 10213865
    Abstract: A method for producing a welded part from two components, where at least one of the components has a hardened surface. The method can include case hardening the surface of one of the components using a salt bath nitriding process and then welding the case hardened first component to the second component by gas metal arc welding (GMAW).
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: February 26, 2019
    Assignee: Whirlpool Corporation
    Inventors: Daniel L. Fondriest, Kurt Werner, Richard J. Widman, Luke J. Wilkins, Steven J. Flick
  • Patent number: 9856906
    Abstract: A hollow shaft, which is usable with a constant velocity universal joint, has an increased static torsional strength and torsional fatigue strength of a small diameter portion (small diameter portion having a smooth outer peripheral surface) formed near a spline at an end portion of the hollow shaft, and has a reduced manufacturing cost. The hollow shaft is molded by plastic working from a tubular blank, and subjected to quench hardening treatment. The quench hardening treatment includes carburizing and quenching treatment. The hollow shaft includes a softened section formed in a part of the hollow shaft by local heating treatment after carrying out the carburizing and quenching treatment.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: January 2, 2018
    Assignee: NTN CORPORATION
    Inventors: Kazuhiko Yoshida, Hiroki Mukai, Hirokazu Ooba
  • Patent number: 9239075
    Abstract: To provide a forged crankshaft having an excellent wear resistance. The forged crankshaft according to the present embodiment includes a non-heat treated steel material. The non-heat treated steel material has a chemical composition which contains, by mass %, C: 0.45 to 0.70%, Si: 0.75 to 1.30%, Mn: 1.00 to 2.00%, S: 0.03 to 0.30%, Cr: 0.05 to 0.30%, Al: 0.005 to 0.050%, and N: 0.005 to 0.020%, the balance being Fe and impurities, and satisfies the following Formula (1): 1.1C+Mn+0.2Cr>2.0??(1) where a symbol of each element in Formula (1) is substituted by the content (mass %) of the each element. A matrix of the non-heat treated steel material is a ferrite-pearlite microstructure in which an area ratio of pro-eutectoid ferrite is less than 10% or a pearlite microstructure.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: January 19, 2016
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kisung Kim, Hiroaki Tahira, Taketo Maejima
  • Patent number: 9200358
    Abstract: The present invention relates to a manufacturing process of a structural component for a motor vehicle, wherein a plate bar is heated, is fed to a die in the heated state and is shaped in the die. The process is characterized in that the plate bar is subjected to a nitriding process before the shaping. Furthermore, a plate bar for hot-forming for manufacturing a structural component for a motor vehicle is described, wherein the surface of the plate bar has a nitrided layer. Finally, the present invention relates to a structural component of a motor vehicle, which is manufactured by hot forming from a plate bar having a nitrided layer.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: December 1, 2015
    Assignee: BENTELER AUTOMOBILTECHNIK GMBH
    Inventors: Armin Zuber, Andreas Frehn
  • Patent number: 9127339
    Abstract: A dual-purpose facility of continuous hot-dip coating and continuous annealing is configured so as to be switched between a continuous hot-dip coated material production line and a continuous annealed material production line, and includes a gas discharge path that discharges atmosphere gas in an annealing furnace from a gas discharge port provided in an outlet side of the annealing furnace out of the annealing furnace and a path opening and closing unit for opening and closing the gas discharge path. The path opening and closing unit opens the gas discharge path when the dual-purpose facility is used as the continuous hot-dip coated material production line and closes the gas discharge path when the dual-purpose facility is used as the continuous annealed material production line.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: September 8, 2015
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Masanori Hoshino
  • Publication number: 20150053310
    Abstract: A method for producing a welded part from two components, where at least one of the components has a hardened surface. The method can include case hardening the surface of one of the components using a salt bath nitriding process and then welding the case hardened first component to the second component by gas metal arc welding (GMAW).
    Type: Application
    Filed: August 23, 2013
    Publication date: February 26, 2015
    Applicant: Whirlpool Corporation
    Inventors: DANIEL L. FONDRIEST, KURT WERNER, RICHARD J. WIDMAN, LUKE J. WILKINS, STEVEN J. FLICK
  • Publication number: 20150047748
    Abstract: The invention pertains to the domain of metallurgy in particular, thermochemical surface treatment of products made of metals, mainly steels, and their alloys and it can be used for products hardening for the purpose of their service durability increase. The method of improvement of mechanical properties of products made of metals, mainly steels and alloys on their basis includes products nitriding in the gas atmosphere containing nitrogen and-or its compounds in the presence of a catalyst.
    Type: Application
    Filed: August 28, 2012
    Publication date: February 19, 2015
    Inventors: Georgy Ramasanovich Umarov, Sergey Boychenko, Shiv Vikram Khemka
  • 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
  • Patent number: 8871035
    Abstract: A process for producing grain oriented magnetic sheets by subjecting a steel slab ?100 mm, containing 2.5-3.5% si, to the following operations: optional first heating, to a temperature T1?1250° C.; first rough hot-rolling at T2 between 900 and 1200° C., the reduction ratio (% Rid) being at least 80% in the absence of a subsequent heating or, in the presence of a subsequent heating to T3?1300° C., at least 60% determined by % Rid=80?(T3?T2)/5; second finishing hot-rolling at T4<1300° C. to a rolled-section thickness of 1.5 3.0 mm; cold-rolling, in one or more stages with optional intermediate annealing and with a cold reduction ratio ?60% applied in the last stage; primary recrystallization annealing, optionally in a decarburizing atmosphere; second recrystallization annealing.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: October 28, 2014
    Assignee: Centro Sviluppo Materiali S.p.A.
    Inventors: Stefano Fortunati, Giuseppe Abbruzzese, Stefano Cicale′
  • Publication number: 20140299234
    Abstract: The invention provides a carburized part which has excellent medium-cycle fatigue strength in particular subjected to surface-hardening treatment by carburization. The invention provides a carburized part including a carburized layer formed by performing carburizing treatment to a steel, the steel including, in terms of % by mass: 0.15% to 0.25% of C, 0.15% or less of Si, 0.4% to 1.1% of Mn, 0.8% to 1.4% of Cr, 0.25% to 0.55% of Mo, 0.015% or less of P, and 0.035% or less of S, with the remainder being Fe and unavoidable impurities, and the steel satisfying the following relation; 0.10?[Mo]/(10[Si]+[Mn]+[Cr])?0.40, in which [M] represents a content of element M in terms of % by mass.
    Type: Application
    Filed: April 4, 2014
    Publication date: October 9, 2014
    Applicants: HONDA MOTOR CO., LTD., DAIDO STEEL CO., LTD.
    Inventors: Shinichiro KATO, Takahiro MIYAZAKI, Yoshinari OKADA, Akihito NINOMIYA, Tetsuya SHIMOMURA, Yasushi MATSUMURA
  • 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: 20140299810
    Abstract: A permanent magnet may include a Fe16N2 phase constitution.
    Type: Application
    Filed: August 17, 2012
    Publication date: October 9, 2014
    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
    Inventors: Jian-Ping Wang, Shihai He, Yanfeng Jiang
  • Patent number: 8845825
    Abstract: The present invention provides spring use heat treated steel which is cold coiled, can achieve both sufficient atmospheric strength and coilability, has a tensile strength of 2000 MPa or more, and can improve the performance as a spring by heat treatment after spring fabrication, that is, high strength spring-use heat treated steel characterized by containing, by mass %, C: 0.45 to 0.9%, Si: 1.7 to 3.0%, and Mn: 0.1 to 2.0%, restricting N: to 0.007% or less, having a balance of Fe and unavoidable impurities, and satisfying, in terms of the analyzed value of the extracted residue after heat treatment, [amount of Fe in residue on 0.2 ?m filter/[steel electrolysis amount]×100?1.1.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: September 30, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Masayuki Hashimura, Tatsuro Ochi, Takayuki Kisu, Hiroshi Hagiwara
  • Publication number: 20140283954
    Abstract: A forged, microalloyed, and nitrided steel part is disclosed to have a composition including 0.20-0.40 wt. % C, 0.50-1.60 wt. % Mn, 0.40-1.50 wt. % Cr, 0.07-0.30 wt. % Al, 0.03-0.20 wt. % V, 0.10-0.40 wt. % Si, and a balance of Fe and incidental impurities. The part may be produced by heating the steel part to austenization temperature of approximately 1100 degrees C. to 1260 degrees C., hot forging the steel part, controlled air cooling the steel part after hot forging at a rate falling approximately in the range from 1 degree C. per second to 5 degrees C. per second as the steel part cools from approximately 900 degrees C. to approximately 500 degrees C. to produce a predominantly bainitic microstructure of greater than approximately 50% bainite. The steel part may then be machined to a desired configuration, and nitrided by heating in an atmosphere containing ammonia.
    Type: Application
    Filed: March 22, 2013
    Publication date: September 25, 2014
    Applicant: Caterpiller Inc.
    Inventors: Kenneth W. BURRIS, Arash TAHAMTAN, Ryan Adam DUSHEKE
  • 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
  • Publication number: 20140230966
    Abstract: A method for producing a grain-oriented electrical steel strip or sheet, in which the slab temperature of a thin slab consisting of a steel having (% wt.) Si: 2-6.5%, C: 0.02-0.15%, S: 0.01-0.1%, Cu: 0.1-0.5%, wherein the Cu to S content ratio is % Cu/% S>4, Mn: up to 0.1%, wherein the Mn to S content ratio is % Mn/% S<2.5, and optional contents of N, Al, Ni, Cr, Mo, Sn, V, Nb, is homogenised to 1000-1200° C. The thin slab is hot rolled into a hot strip having a thickness of 0.5-4.0 mm at an initial hot-rolling temperature of <=1030° C. and a final hot-rolling temperature of >=710° C., with a thickness reduction in the first and in the second hot-forming passes of >=40%. The hot strip is cooled, coiled, and cold rolled into a cold strip having a final thickness of 0.15-0.50 mm. An annealing separator is applied onto the annealed cold strip to form a Goss texture.
    Type: Application
    Filed: September 20, 2012
    Publication date: August 21, 2014
    Inventors: Andreas Boettcher, Ludger Lahn, Gerhard Inden, Eberhard Sowka
  • Publication number: 20140224383
    Abstract: Steel for manufacturing cemented steel parts, characterized in that the composition thereof in weight percentages is: 0.1%?C?0.15%; 0.8%?Mn?2%; 1%?Cr?2.5%; 0.2%?Mo?0.6%; trace elements?Si?0.35%; trace elements?Ni?0.7% trace elements?B?0.005%; trace elements?Ti?0.1% trace elements?N?0.01% if 0.0005% (5 ppm)?B?0.005%, and trace elements?N?0.02% if trace elements?B?0.0005% (5 ppm); trace elements?Al?0.1%; trace elements?V?0.3%; trace elements?P?0.025%; trace elements?Cu?1%, preferably?0.6%; trace elements?S?0.1%; the remainder being iron and impurities resulting from production. A cemented steel part made with this steel, and to the method for manufacturing same.
    Type: Application
    Filed: August 8, 2012
    Publication date: August 14, 2014
    Applicant: Ascometal
    Inventor: Christophe Mendibide
  • Publication number: 20140197602
    Abstract: A piston ring comprising upper face, a lower face, an inner perimeter wall, and an outer perimeter wall that extends around the piston ring from the upper face to the lower face, where the outer perimeter wall has upper corner region disposed adjacent the upper face, a lower corner region disposed adjacent the lower face, and a band of a nitrided conversion layer extending between the upper corner region and the lower corner region, and where a PVD nitride layer is disposed on the upper corner region and on the lower corner region.
    Type: Application
    Filed: January 15, 2013
    Publication date: July 17, 2014
    Applicant: Mahle International GmbH
    Inventor: John C. Lahrman
  • Publication number: 20130306194
    Abstract: A method of treating bearing rolling elements or bearing rings after a hardening and temper heat treatment is disclosed. The method may include treating the bearing rolling elements in a tumbling treatment and then in a duplex hardening treatment. The method may include treating the bearing rings in a peening treatment and then in a duplex hardening treatment. The duplex hardening treatment may also include at least one sequential process segment consisting of subjecting the bearing rolling element & rings to a nitriding process to increase the surface hardness and compressive residual stress. The combined two-step process produces a deep surface/sub-surface residual stress greater than the depth of the maximum operating von-Mises shear stress along with an ultra-hard surface with high magnitude of compressive residual stress. In so doing, the bearing ring and rolling elements will have significantly enhanced rolling contact fatigue resistance and resistance to surface imperfections and debris.
    Type: Application
    Filed: May 17, 2012
    Publication date: November 21, 2013
    Inventors: Herbert A. Chin, William P. Ogden, David A. Haluck, Sean McCutchan, Ronald F. Spitzer, Allen V. Keller
  • Publication number: 20130213527
    Abstract: Disclosed herein is a high-strength transmission gear, manufactured by gas-nitriding a nitriding steel having a composition including iron (Fe) as a main component, 0.25˜0.40 wt % of carbon (C), 0.50˜1.0 wt % of manganese (Mn), 2.0˜3.0 wt % of chromium (Cr), 0.3˜1.0 wt % of molybdenum (Mo), 0.2˜0.7 wt % of copper (Cu), 0.03˜0.1 wt % of niobium (Nb), 0.03˜0.1 wt % of aluminum (Al), 0.05˜0.15 wt % of vanadium (V), 0.001˜0.005 wt % of boron (B) and other inevitable impurities. More specifically, while gas-nitriding of the nitriding steel, the temperature is increased in steps, and the ratio of nitrogen gas in the nitriding steel is decreased in steps.
    Type: Application
    Filed: March 21, 2013
    Publication date: August 22, 2013
    Applicants: KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANY
    Inventors: Hyundai Motor Company, Kia Motors Corporation
  • Publication number: 20130209015
    Abstract: Method for manufacturing a bearing ring (14, 34, 36) from at least one steel bar (12) having ends. The method comprises the steps of forming said at least one steel bar (12) into at least one ring segment and flash butt welding the ends (12a, 12b) of said at least one ring segment to make a ring. The method also comprises the step of carburizing at least part (C) of a surface (12c, 12d) of said at least one steel bar (12) which is adjacent to said surface (12a, 12b) that is to be flash butt welded prior to said flash butt welding.
    Type: Application
    Filed: May 27, 2011
    Publication date: August 15, 2013
    Inventor: Patrik Dahlman
  • Publication number: 20130206284
    Abstract: A method for producing a steel component with a metallic anti-corrosion coating from a sheet steel product comprising at least 0.4% by weight Mn is disclosed. The sheet steel product is annealed in a continuous furnace under an annealing atmosphere containing up to 25% by volume H2, 0.1% to 10% by volume NH3, H2O, N2, and process-related impurities as the remainder, at a dew point between ?50° C. and ?5° C. at a temperature of 400 to 1100° C. for 5 to 600 s. The annealed sheet steel product has a 5 to 200 ?m thick nitration layer with a particle size finer than the particle size of the inner core layer. Once coated with a metallic protective layer, a blank is separated from the annealed sheet steel product, heated to an austenitising temperature of 780 to 950° C., hot-formed, and cooled so that a hardened structure forms.
    Type: Application
    Filed: June 14, 2011
    Publication date: August 15, 2013
    Applicant: THYSSENKRUPP STEEL EUROPE AG
    Inventors: Martin Norden, Jens Kondrattuk, Manfred Meurer, Patrik Kuhn, Volker Marx, Horst Berndsen, Frank Friedel
  • Publication number: 20130181410
    Abstract: A high-quality internal combustion engine oil ring which stably keeps oil consumption low for a long period and in which the shapes of an upper rail and a lower rail can be formed at low cost with high accuracy. The internal combustion engine oil ring has a recessed stepped portion formed at a corner of a sliding surface of an outer peripheral sliding projection in sliding contact with a cylinder inner wall surface of at least one of a first rail and a second rail constituting an oil ring main body, in a shape in vertical cross-section along a sliding direction of the first rail and second rail, and a wall surface of the recessed stepped portion has an arcuate surface having a radius of curvature of 0.02 mm to 0.08 mm.
    Type: Application
    Filed: March 31, 2011
    Publication date: July 18, 2013
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Patent number: 8480817
    Abstract: One embodiment of the present invention is a unique method for thermal mechanical processing of a martensitic stainless steel. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for thermal mechanical processing of a martensitic stainless steel and forged objects resulting therefrom. Further embodiments, forms, features, aspects, benefits, and advantages of the present application shall become apparent from the description and figures provided herewith.
    Type: Grant
    Filed: July 11, 2010
    Date of Patent: July 9, 2013
    Assignee: Rolls-Royce Corporation
    Inventors: Sushil K. Jain, Stephen N. Hammond
  • 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: 20130160897
    Abstract: The present invention has as objective a procedure for the oriented-grain magnetic sheet that provides particular operative hot rolling mill conditions of silicon steel slabs, by means which it is possible to highly contain the heterogeneities of hot rolled sheet re-crystallization. The use of these operative conditions permits to reduce the growing tendency of the crystallized grain during the annealing of the sheets at a final thickness that precedes the secondary oriented re-crystallization. Contemporarily, the particular operational conditions of hot rolling mill according to the invention permit a fine precipitation of secondary phases useful to the control of the grain growing, starting from a quantity of sulphur (S) and nitrogen (N) in matrix lower than corresponding provided by the conventional technologies and consequently disposable in metallic solid solution before the rolling after the heating of the slabs at temperature values lower than 1300° C.
    Type: Application
    Filed: June 25, 2012
    Publication date: June 27, 2013
    Applicant: CENTRO SVILUPPO MATERIALI S.P.A.
    Inventors: Giuseppe ABBRUZZZESE, Stefano Cicale, Stefano Fortunati
  • 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
  • Publication number: 20130068349
    Abstract: Disclosed herein is a high-strength transmission gear, manufactured by gas-nitriding a nitriding steel having a composition including iron (Fe) as a main component, 0.25˜0.40 wt % of carbon (C), 0.50˜1.0 wt % of manganese (Mn), 2.0˜3.0 wt % of chromium (Cr), 0.3˜1.0 wt % of molybdenum (Mo), 0.2˜0.7 wt % of copper (Cu), 0.03˜0.1 wt % of niobium (Nb), 0.03˜0.1 wt % of aluminum (Al), 0.05˜0.15 wt % of vanadium (V), 0.001˜0.005 wt % of boron (B) and other inevitable impurities. More specifically, while gas-nitriding of the nitriding steel, the temperature is increased in steps, and the ratio of nitrogen gas in the nitriding steel is decreased in steps.
    Type: Application
    Filed: December 12, 2011
    Publication date: March 21, 2013
    Applicants: KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANY
    Inventors: Jae Hong Park, Bong Lae Jo
  • Patent number: 8377235
    Abstract: The invention refers to a process for forming a steel component, incorporating the steps of—providing a blank having substantially the volume of the component to be formed,—heating the blank to a semi solid state with a specific liquid fraction,—forming the blank with a forging technique to a component of near net shape dimensions,—subjecting the formed, near net shape component, to a normalization combined with a hardening,—subjecting the normalized and hardened near net shape component to machining to give the component net shape.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: February 19, 2013
    Assignee: Aktiebolaget SKF
    Inventors: Patrick Dahlman, Martin Friis, Henrik Karlsson
  • Publication number: 20130008566
    Abstract: A spring 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 S, and the balance of Fe and inevitable impurities. The spring has a nitrogen compound layer and a carbon compound layer at the surface at a total thickness of not more than 2 ?m. The spring has a center portion with hardness of 500 to 700 HV in a cross section and has a compressive residual stress layer at a surface layer. The compressive residual stress layer has a thickness of 0.30 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section, and has maximum compressive residual stress of 1400 to 2000 MPa.
    Type: Application
    Filed: March 23, 2011
    Publication date: January 10, 2013
    Applicant: NHK SPRING CO., LTD.
    Inventors: Takeshi Suzuki, Yoshiki Ono, Shimpei Kurokawa
  • Publication number: 20130004883
    Abstract: Provided is a novel high-nitrogen stainless-steel pipe which is not obtained with any conventional technique, the stainless-steel pipe having high strength, high ductility, and excellent corrosion and heat resistance and being obtained through size reduction of crystal grains and strengthening by slight plastic working besides formation of a gradient structure in which the concentration of solid-solution nitrogen continuously decreases gradually from the surface. Also provided are hollow materials of various shapes and sizes which are formed from the steel pipe and processes for producing the steel pipe and the hollow materials. An austenitic stainless-steel pipe is treated in a range of the temperatures not higher than the critical temperature for crystal grain enlargement of the steel pipe material to cause nitrogen (N) to be absorbed into the surface of the pipe and diffused into the solid phase, while minimizing the enlargement of crystal grains during the treatment.
    Type: Application
    Filed: February 4, 2011
    Publication date: January 3, 2013
    Inventors: Harumatu Miura, Kazuo Oda
  • 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
  • Patent number: 8273188
    Abstract: In a constant velocity universal joint component and a manufacturing method thereof capable of achieving increased strength without significant procedural changes, and that can contribute to size reduction and weight reduction, a sharp-angled portion 15 is formed by machining after cold plastic working is applied. A carburization process is then performed in which surface carbon concentration of 0.45 mass % to less than 0.60 mass % is obtained. Quenching is then performed. High-frequency induction hardening is subsequently performed.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: September 25, 2012
    Assignee: NTN Corporation
    Inventor: Kazuhiko Yoshida
  • Publication number: 20120222777
    Abstract: A process to manufacture grain-oriented electrical steel (GOES) strip and a product produced by the process are provided. A molten silicon-alloyed steel is continuously cast in a strand having a thickness in the range of from 50 to 100 mm and subjected to hot- rolling in a plurality of uni-directional rolling stands to produce final hot-rolled strip coils having a thickness in the range of from 0.7 to 4.0 mm followed by a continuous annealing the hot-rolled strip, cold rolling, continuous annealing the cold-rolled strip to induce primary recrystallisation and, optionally, decarburization and/or nitriding, coating the annealed strip, annealing the coiled strip to induce secondary recrystallisation, continuous thermal flattening annealing of the annealed strip and coating the annealed strip for electric insulation.
    Type: Application
    Filed: November 24, 2010
    Publication date: September 6, 2012
    Applicant: Tata Steel IJmuiden B.V.
    Inventors: Stefano Fortunati, Giuseppe Abbruzzese, Lieven Bracke
  • Publication number: 20120037278
    Abstract: A roller bearing having two cooperating rolling parts of which one is of ceramic and the other of a steel. The steel part is of such structure and/or material and/or is so produced to cause residual compressive stresses to form beneath the contact surface of the steel part, at least in a load-free state, down to a depth.
    Type: Application
    Filed: October 27, 2011
    Publication date: February 16, 2012
    Applicant: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
    Inventors: Oskar BEER, Franz-Josef EBERT, Gerhard KREISELMEIER, Edgar STREIT
  • 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: 20120018049
    Abstract: Process for the production of grain-oriented magnetic sheets, wherein a slab made of steel having a thickness of ?100 mm, containing Si in the range comprised between 2.5 and 3.5% by weight, is subjected to a thermo-mechanical cycle comprising the following operations:—optional first heating to a temperature T1 no higher than 1250° C.·first rough hot-rolling, in a first rough hot rolling mill, to a temperature T2 comprised between 900 and 1200° C., the reduction ratio (% Rid) applied to the first rough hot-rolling being adjusted so as to be:—of at least 80%, in the absence of a subsequent heating to a temperature T3—determined by the following relationship % Rid=80 (T3?T2)/5, in the presence of a subsequent heating to a temperature T3—optional second heating to a temperature T3 >T2·second finishing hot-rolling, in a second fmishing hot rolling mill, to a temperature T4<T3 to a thickness of the rolled section comprised in the range of 1.5 mm-3.
    Type: Application
    Filed: November 18, 2009
    Publication date: January 26, 2012
    Applicant: CENTRO SVILUPPO MATERIALI S.P.A.
    Inventors: Stefano Fortunati, Giuseppe Abbruzzese, Stefano Cicale
  • 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
  • Patent number: 7988796
    Abstract: A method of manufacturing a sheave member for a belt-type continuously variable transmission includes a forming step wherein an intermediate product having a sheave surface is formed by forging a steel material; a carburization step wherein the intermediate product is heated in a carburization gas; a gradual cooling step wherein the cooling speed is equal to or less than 20° C./sec, at least until the temperature of the intermediate product has passed through the transformation point; a high-frequency electrical heating step wherein a selected portion(s) of the intermediate product is heated; a water quenching step wherein the selected portion is quenched by contact with water; and a finishing step wherein a grinding process is applied to the intermediate product to attain the final shape. In the cooling step, preferably, the intermediate product is contacted with a cooling gas at a pressure lower than atmospheric pressure.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: August 2, 2011
    Assignee: Aisin AW Co., Ltd.
    Inventors: Kouji Ohbayashi, Kazuaki Okada, Taro Matsukawa, Yutaka Eto, Koki Mizuno, Kazumichi Tsukuda
  • Publication number: 20110108164
    Abstract: One embodiment of the present invention is a unique method for thermal mechanical processing of a martensitic stainless steel. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for thermal mechanical processing of a martensitic stainless steel and forged objects resulting therefrom. Further embodiments, forms, features, aspects, benefits, and advantages of the present application shall become apparent from the description and figures provided herewith.
    Type: Application
    Filed: July 11, 2010
    Publication date: May 12, 2011
    Inventors: Sushil K. Jain, Stephen N. Hammond
  • 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: 20110000584
    Abstract: The invention refers to a process for forming a steel component, incorporating the steps of—providing a blank having substantially the volume of the component to be formed,—heating the blank to a semi solid state with a specific liquid fraction,—forming the blank with a forging technique to a component of near net shape dimensions,—subjecting the formed, near net shape component, to a normalization combined with a hardening,—subjecting the normalized and hardened near net shape component to machining to give the component net shape.
    Type: Application
    Filed: November 6, 2008
    Publication date: January 6, 2011
    Inventors: Patrik Dahlman, Martin Friis, Henrik Karlsson
  • Patent number: 7815750
    Abstract: The present invention provides a method of production of a steel soft nitrided machine part comprising: preparing a steel material containing, by mass %, C: 0.15-0.30%, Si: 0.03-1.00%, Mn: 0.20-1.5%, S: 0.04-0.06%, Cr: 0.01-0.5%, Mo: 0.40-1.5%, Nb: 0.005-0.05%, Ti: 0.005-0.03%, V: 0.2-0.4%, Ni: 0.05-1.5%, N: 0.002-0.0048%, a balance of Fe and unavoidable impurities, limiting P to 0.02% or less, limiting Ceq. (equation (1)) to 0.65-0.85, controlling DI (equation (2)) to 80-155, log Kp (equation (3)) to 2.5-8, and Si and Mn contents according to equation (4), heating the steel material to 1150-1280° C., hot forging the steel material to the shape of the part, cooling the steel material at a 0.5-1.5° C/sec cooling rate to obtain a hot forged part having a micrometallic structure with more than 50% of bainite, machining the hot forged part, and soft nitriding the machined hot forged part at 550-650° C. for 30 minutes or more.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: October 19, 2010
    Assignees: Nippon Steel Corporation, Honda Motor Co., Ltd.
    Inventors: Makoto Okonogi, Kenichiro Naito, Kohki Mizuno, Hideki Matsuda, Seiji Kobayashi
  • 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
  • Publication number: 20090199930
    Abstract: A case hardened gear steel having enhanced core fracture toughness includes by weight percent about 16.3Co, 7.5Ni, 3.5Cr, 1.75Mo, 0.2W, 0.11C, 0.03Ti, and 0.02V and the balance Fe, characterized as a predominantly lath martensitic microstructure essentially free of topologically close-packed (TCP) phases and carburized to include fine M2C carbides to provide a case hardness of at least about 62 HRC and a core toughness of at least about 50 ksi?in.
    Type: Application
    Filed: August 20, 2008
    Publication date: August 13, 2009
    Applicant: QuesTek Innovations LLC
    Inventors: James A. Wright, Jason Sebastian
  • Publication number: 20090194203
    Abstract: A blade made of a carbon steel or alloy steel is subjected to a surface nitriding process to form a high hardness nitride layer having a thickness in the range of 10 ?m to 100 ?m and a Vickers hardness Hv of 1000 or more, and a silver oxide layer, a copper oxide layer, or a silver oxide and copper oxide layer is formed on the high hardness nitride layer of the blade by firing. Through this processing, the blade that has a high cutting maintaining ability and an excellent sanitization ability such as antibiosis, sterilization ability, and antimold ability is provided.
    Type: Application
    Filed: September 26, 2008
    Publication date: August 6, 2009
    Inventor: Akiko Hirai
  • Patent number: 7559995
    Abstract: A process for heat treating metal workpieces contains with respect to an efficient process control the following successive operations following directly one after the other: a heating phase; an enrichment phase; a first cooling phase; a bonding phase; a second cooling phase; and a concluding quenching phase. Workpieces processed by a method of this type are distinguished by a comparatively great fatigue limit and fatigue strength with simultaneous high resistance to wear and tear.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: July 14, 2009
    Assignee: Ipsen International GmbH
    Inventor: Bernd Edenhofer
  • Publication number: 20090174129
    Abstract: Provided is a high-strength stainless steel spring exhibiting a good workability and having a high load characteristic. Thus, the high-strength stainless steel spring of the invention has an chemical component containing 0.04 to 0.08% by mass of C, 0.15 to 0.22% by mass of N, 0.3 to 2.0% by mass of Si, 0.5 to 3.0% by mass of Mn, 16 to 20% by mass of Cr, 8.0 to 10.5% by mass of Ni, 0.5 to 3.0% by mass of Mo, and the balance of Fe and inevitable impurities, and when the average diameter of the coil is represented by D and further the diameter of the steel wire is represented by d in the case that cross sections of the stainless steel wire are in a complete round form or the value obtained by subtracting the average coil diameter from the outer diameter of the coil is represented by d? in the case that the cross sections of the stainless steel wire are in a form other than the complete round form, the spring has a spring index D/d or D/d? of 2 to 6.
    Type: Application
    Filed: February 16, 2007
    Publication date: July 9, 2009
    Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO (SEI) STEEL WIRE CORP., NHK SPRING CO., LTD.
    Inventors: Hiromu Izumida, Nozomu Kawabe, Shinei Takamura, Teruyuki Murai, Noritoshi Takamura