Ferrous (i.e., Iron Base) Patents (Class 148/318)
  • Patent number: 10570496
    Abstract: A nitrided part and soft nitrided part with excellent wear resistance and pitting resistance and a nitriding method and soft nitriding method are provided, specifically, a nitrided part or soft nitrided part made by a steel material comprising, by mass %, C: 0.05 to 0.3%, Si: 0.05 to 1.5%, Mn: 0.2 to 1.5%, P: 0.025% or less, S: 0.003 to 0.05%, Cr: 0.5 to 2.0%, Al: 0.01 to 0.05%, and N: 0.003 to 0.025% and having a balance of Fe and impurities, wherein, the surface layer comprises a compound layer containing iron, nitrogen, and carbon and a nitrogen diffusion layer positioned below the compound layer, the compound layer comprises an ? single phase, the ? single phase has a thickness of 8 to 30 ?m and a Vicker's hardness of 680 HV or more, and the ? single phase has a volume ratio of pores of less than 10%.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: February 25, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takahide Umehara, Masato Yuya
  • Patent number: 10563277
    Abstract: A hot-work mold steel includes 0.37 to 0.46 wt % of carbon (C), 0.25 to 0.5 wt % of silicon (Si), 0.36 to 0.56 wt % of manganese (Mn), 2.0 to 5.0 wt % of chromium (Cr), 1.4 to 2.6 wt % of molybdenum (Mo), 0.4 to 0.8 wt % of vanadium (V), 0.0007 to 0.004 wt % of boron (B), 0.002 to 0.022 wt % of aluminum (Al), 0.001 to 0.09 wt % of titanium (Ti) and the remainder of iron (Fe) and inevitable impurities. The hot-work mold steel exhibits superior thermal conductivity, hardenability, durability, and nitriding characteristics, and increased resistance to heat check and melt-out. A die-casting mold made of the steel has improved thermal conductivity regardless of mold size and a prolonged life cycle and can improve the surface quality in manufactured parts.
    Type: Grant
    Filed: May 28, 2018
    Date of Patent: February 18, 2020
    Assignee: Doosan Heavy Industries Construction Co., Ltd
    Inventors: Kuk Cheol Kim, Byoung Koo Kim, Jeong Wook Kim, Jae Suk Jeong
  • Patent number: 10502319
    Abstract: To provide a piston ring free from microwelding to a piston while exhibiting excellent wear resistance in side surfaces, for a long period of use in a high-temperature, high-pressure environment, and its production method, a nitride layer is formed on at least one of upper and lower side surfaces of the piston ring, and then subjected to a phosphate chemical conversion treatment, such that the nitride layer has at least one of granular and vermicular surface forms.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: December 10, 2019
    Assignee: KABUSHIKI KAISHA RIKEN
    Inventor: Yuji Shima
  • Patent number: 10370747
    Abstract: A nitrided component has a chemical composition consisting of, by mass percent, C: 0.07-0.14%, Si: 0.10-0.30%, Mn: 0.4-1.0%, S: 0.005-0.030%, Cr: 1.0-1.5%, Mo: ?0.05% (including 0%), Al: 0.010% or more to less than 0.10%, V: 0.10-0.25%, optionally at least one element selected from Cu: ?0.30% and Ni: ?0.25%, [0.61Mn+1.11Cr+0.35Mo+0.47V?2.30], and the balance of Fe and impurities. P, N, Ti and O among the impurities are P: ?0.030%, N: ?0.008%, Ti: ?0.005%, and O: ?0.0030%. The nitrided composition is suitable for use as an automobile ring gear. The nitrided component has a surface hardness of 650-900 HV, core hardness being ?150 HV, effective case depth of ?0.15 mm, has excellent bending fatigue strength and surface fatigue strength although the content of Mo is as low as ?0.05% and has a small amount of expansion caused by nitriding.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: August 6, 2019
    Assignees: NIPPON STEEL CORPORATION, HONDA MOTOR CO., LTD.
    Inventors: Hideki Imataka, Masato Yuya, Yuya Gyotoku, Atsushi Kobayashi, Susumu Maeda
  • Patent number: 10294941
    Abstract: A compressor includes a cylinder including a cylinder chamber, a piston movably arranged relative to the cylinder in the cylinder chamber, and a sliding member slideable against the cylinder and the piston in the cylinder chamber. The cylinder and the piston are constructed from an Al—Si alloy having a Si content exceeding 12.6 wt %, which is a eutectic point. The sliding member is constructed from steel and has a surface layer including a sliding surface slideable against the cylinder and the piston. The surface layer is treated so as to have greater hardness than hardness of proeutectic Si contained in the Al—Si alloy, and the surface layer has hardness of at least Hv 1000 in the sliding surface.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: May 21, 2019
    Assignee: Daikin Industries, Ltd.
    Inventors: Kousuke Nishimura, Kazuhiro Furusho, Takeyoshi Ohkawa
  • Patent number: 10233519
    Abstract: A spray-formed high-speed steel includes chemical components by mass percent of: C: 0.85-1.65%, Si: 0.1-1.2%, Cr: 3.5-8.0%, W: 4.0-6.5%, Mo: 4.5-7.0%, V: 1.0-4.0%, Co: 1.0-8.0%, Mn: 0.2-0.8%, and Nb: 0.2-3.5%, with balance of iron and impurities.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: March 19, 2019
    Assignees: HEYE SPECIAL STEEL CO., LTD., ADVANCED TECHNOLOGY&MATERIALS CO., LTD.
    Inventors: Lizhi Wu, Xiaoming Li, Yunfeng Yang, Chunjiang Kuang, Dongmei Xin, Liqing Shao, Yucheng Fang
  • Patent number: 10167528
    Abstract: A novel FeMnAlC alloy, comprising 23˜34 wt. % Mn, 6˜12 wt. % Al, and 1.4˜2.2 wt. % C with the balance being Fe, is disclosed. The as-quenched alloy contains an extremely high density of nano-sized (Fe,Mn)3AlCx carbides (??-carbides) formed within austenite matrix by spinodal decomposition during quenching. With almost equivalent elongation, the yield strength of the present alloys after aging is about 30% higher than that of the optimally aged FeMnAlC (C?1.3 wt. %) alloy systems disclosed in prior arts. Moreover, the as-quenched alloy is directly nitrided at 450˜550° C., the resultant surface microhardness and corrosion resistance in 3.5% NaCl solution are far superior to those obtained previously for the optimally nitrided commercial alloy steels and stainless steels, presumably due to the formation of a nitrided layer consisting predominantly of AlN.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: January 1, 2019
    Assignee: APOGEAN METAL CO., LTD.
    Inventor: Tzeng-Feng Liu
  • Patent number: 9994944
    Abstract: A steel for cold forging/nitriding has, by mass percent, C: 0.01 to 0.15%, Si?0.35%, Mn: 0.10 to 0.90%, P?0.030%, S?0.030%, Cr: 0.50 to 2.0%, V: 0.10 to 0.50%, Al: 0.01 to 0.10%, N?0.0080%, and O?0.0030%, further according to need a specific amount of one or more elements selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, with the balance being Fe and impurities, and further satisfying the conditions of [399×C+26×Si+123×Mn+30×Cr+32×Mo+19×V?160], [20?(669.3×logeC?1959.6×logeN?6983.3)×(0.067×Mo+0.147×V)?80], [140×Cr+125×Al+235×V?160] and [90?511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V?170] are excellent in cold forgeability and machinability after cold forging.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: June 12, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hideki Imataka, Masayuki Horimoto, Yusuke Usui, Yuya Gyotoku
  • Patent number: 9777352
    Abstract: To provide an oil-well steel pipe having excellent SSC resistance. The oil-well steel pipe according to the present invention contains, by mass percent, C: 0.15 to 0.35%, Si: 0.1 to 0.75%, Mn: 0.1 to 1.0%, Cr: 0.1 to 1.7%, Mo: 0.1 to 1.2%, Ti: 0.01 to 0.05%, Nb: 0.010 to 0.030%, Al: 0.01 to 0.1%, P: at most 0.03%, S: at most 0.01%, N: at most 0.007%, and O: at most 0.01%, the balance being Fe and impurities. The Ti content and the Nb content in a residue obtained by bromine-methanol extraction satisfy equation (1): 100×[Nb]/([Ti]+[Nb])?27.5??(1) where the Ti content (mass %) and the Nb content (mass %) in the residue are substituted for [Ti] and [Nb].
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: October 3, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Atsushi Soma, Tomohiko Omura, Yuji Arai, Mitsuhiro Numata, Toru Takayama, Masanao Seo
  • Patent number: 9777353
    Abstract: A hot-rolled steel sheet for nitriding or a cold-rolled steel sheet for nitriding, in which a dislocation density within 50 ?m in the sheet thickness direction from the surface is not less than 2.0 times nor more than 10.0 times as compared to a dislocation density at the position of ¼ in the sheet thickness direction; and a method of manufacturing the same. The manufacturing method comprises, on a hot-rolled steel sheet or a cold-rolled steel sheet, performing pickling, and then performing skin pass rolling under the condition that a reduction ratio is 0.5 to 5.0% and FIT, defined as a ratio of a line load F (kg/mm) of a rolling mill load divided by a sheet width of the steel sheet and a load T (kg/mm2) per unit area to be applied in the longitudinal direction of the steel sheet, is 8000 or more.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: October 3, 2017
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Eisaku Sakurada, Shunji Hiwatashi, Kunio Hayashi, Shinichi Suzuki
  • Patent number: 9617952
    Abstract: To provide a price-competitive compression ring having excellent thermal conductivity and thermal sag resistance, which can be used in a high-thermal-load environment of high-compression-ratio engines, steel identified by the material number of SUP10 in JIS G 4801, which contains small amounts of alloying elements, is used, and a piston ring wire is annealed before an oil-tempering treatment such that spheroidal cementite having an average particle size of 0.1-1.5 ?m is dispersed in a tempered martensite matrix, thereby suppressing the movement of dislocation and creep even at 300° C., and improving thermal sag resistance.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: April 11, 2017
    Assignees: KABUSHIKI KAISHA RIKEN, TOKUSEN KOGYO CO., LTD.
    Inventors: Yuji Shima, Junya Takahashi, Ryouichi Kamon
  • Patent number: 9574256
    Abstract: A steel comprises, by mass percent, C: 0.10 to 0.15%, Si: not less than 0.02% and less than 0.10%, Mn: more than 0.90% and not more than 2.50%, P?0.030%, S?0.050%, Cr: 0.80 to 2.0%, V: 0.05 to 0.50%, Al: 0.01 to 0.07%, N?0.0080%, O?0.0030%, and one or more selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, the balance being Fe and impurities. The composition satisfies [35?Mn/S?200], [20?(669.3×loge C?1959.6×loge N?6983.3)×(0.067×Mo+0.147×V)?80], [140×Cr+125×Al+235×V?160] and [150?511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V?200].
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: February 21, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hideki Imataka, Masayuki Horimoto, Yuya Gyotoku, Kosuke Tanaka
  • Patent number: 9453276
    Abstract: Processes for protecting steel chains from corrosion and steel chains thus protected are provided. The process includes using finite element analysis to determine stress levels within links of a steel chain having a plurality of connected links. Regions of each link of the chain corresponding to high stress levels are identified. Target areas corresponding to the regions identified are indicated for coating each link of the chain with a sacrificial coating. Thermally sprayed alumina can be used as the sacrificial coating.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: September 27, 2016
    Assignee: Chevron U.S.A. Inc.
    Inventors: Kai-tung Ma, Devin Lee Witt, Samuel Jay Mishael, Adebayo Olakunle Akinpelu, Ariel Alexander Gonzalez
  • Patent number: 9404578
    Abstract: A coated piston ring having a base body of chromium steel with more than 10 wt.-% chromium and having an inner circumferential surface, a first flank surface, a second flank surface and an outer circumferential surface. The first flank surface comprises a nitride diffusion layer with a layer thickness of from 5-300 ?m, a nitride connecting layer with a layer thickness of from 0.5-15 ?m on the nitride diffusion layer, and an oxide layer with a layer thickness of from 0.05-3 ?m on the nitride connecting layer. The second flank surface comprises the nitride diffusion layer, and the outer circumferential surface comprises the nitride diffusion layer and a chromium solid particle layer with 0.1-30 vol.-% solid particles, relative to the total volume of the chromium solid particle layer on the nitride diffusion layer.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: August 2, 2016
    Assignee: Federal-Mogul Burscheid GmbH
    Inventors: Christian Herbst-Dederichs, Waldemar Urbatzka, Stefan Duerdoth, Peter-Klaus Esser
  • Patent number: 9157136
    Abstract: A multi-element alloy material consists of Al, Cr, Fe, Mn, Mo and Ni. From an outer surface to a center of the multi-element alloy material exhibits a hardness gradient from high to low. A method of manufacturing a multi-element alloy material with hardness gradient includes melting and casting metals with a metal combination of Al, Cr, Fe, Mn, Mo and Ni to form an alloy body, subjecting the alloy body to a homogenization treatment, and subjecting the homogenized alloy body to a high temperature treatment to perform precipitation hardening at surface of the alloy body by heating, thereby forming a multi-element alloy material having hardness gradient.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: October 13, 2015
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Yu-Hsien Chou, Chih-Chao Yang
  • 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: 20150107723
    Abstract: This invention relates to a partially carbonitriding heat treated stainless steel ferrule, having a first region with a first hardness and a second region with a second hardness, wherein the first region includes a nitrogen layer having a nitrogen concentration higher than a carbon concentration, and a carbon layer formed under the nitrogen layer and having a carbon concentration higher than a nitrogen concentration, so that the first hardness is greater than the second hardness. Thereby, partial heat treatment is effective at preventing rotational torque of the region, except for the portion to be heat treated, from increasing due to the total hardening.
    Type: Application
    Filed: October 15, 2014
    Publication date: April 23, 2015
    Applicants: DK-LOK CORPORATION
    Inventors: Eun Sik Noh, Sam Rae Jung
  • Publication number: 20150099140
    Abstract: The invention relates generally to welding and, more specifically, to welding wires for arc welding, such as Gas Metal Arc Welding (GMAW) or Flux Core Arc Welding (FCAW). A disclosed tubular welding wire has a sheath and a core, and the tubular welding wire includes an organic stabilizer component, a rare earth component, and a corrosion resistant component comprising one or more of: nickel, chromium, and copper.
    Type: Application
    Filed: October 8, 2014
    Publication date: April 9, 2015
    Inventors: Mario Anthony Amata, Steven Edward Barhorst, Tre' Dorell Heflin-King
  • Publication number: 20150083279
    Abstract: A nitrocarburized crankshaft member made of a steel having essentially ferrite and perlite, and at least a portion of a steel surface thereof having a ferrite surface area of 50% or greater that is imparted with a nitrocarburized hard layer. The steel consists of C, Si, Mn, Cu, Ni, and Cr as required elements and Mo, N, s-Al, Ti, Pb, Bi, and Ca as optional elements that may be included, and Fe and inevitable impurities. C is within a range of 0.25 to 0.32%. The nitrocarburized crankshaft member includes a thickness of a surface compound layer of the nitrocarburized hard layer of 10 to 35 ?m that is formed during establishment of a diffusion depth of a nitrogen diffusion zone below the surface compound layer of 700 ?m or greater.
    Type: Application
    Filed: November 26, 2014
    Publication date: March 26, 2015
    Applicants: DAIDO STEEL CO., LTD., HONDA MOTOR CO., LTD.
    Inventors: Isamu SAITO, Yoshihiro TAKITANI, Shinichiro KATO, Makoto HOBO, Keiichiro KAMIYA, Takahiro MIYAZAKI, Takashi KANO
  • Patent number: 8980022
    Abstract: This case hardening steel has a chemical composition including, by mass %: C: 0.1 to 0.6%; Si: 0.02 to 1.5%; Mn: 0.3 to 1.8%; P: 0.025% or less; S: 0.001 to 0.15%; Al: over 0.05 to 1.0%; Ti: 0.05 to 0.2%; N: 0.01% or less; and O: 0.0025% or less, and further including, by mass %, one or more of Cr: 0.4 to 2.0%, Mo: 0.02 to 1.5%, Ni: 0.1 to 3.5%, V: 0.02 to 0.5%, and B: 0.0002 to 0.005%, and the balance consisting of iron and unavoidable impurities.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: March 17, 2015
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Kei Miyanishi, Masayuki Hashimura, Shuuji Kozawa, Manabu Kubota, Tatsuro Ochi
  • Publication number: 20150059933
    Abstract: A steel comprises, by mass percent, C: 0.10 to 0.15%, Si: not less than 0.02% and less than 0.10%, Mn: more than 0.90% and not more than 2.50%, P?0.030%, S?0.050%, Cr: 0.80 to 2.0%, V: 0.05 to 0.50%, Al: 0.01 to 0.07%, N?0.0080%, O?0.0030%, and one or more selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, the balance being Fe and impurities. The composition satisfies [35?Mn/S?200], [20?(669.3×logeC?1959.6×logeN?6983.3)×(0.067×Mo+0.147×V)?80], [140×Cr+125×Al+235×V?160] and [150?511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V?200].
    Type: Application
    Filed: February 28, 2013
    Publication date: March 5, 2015
    Inventors: Hideki Imataka, Masayuki Horimoto, Yuya Gyotoku, Kosuke Tanaka
  • 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: 20150053311
    Abstract: A nitrided steel member including an iron nitride compound layer formed on a surface of a steel member having predetermined components, wherein: in X-ray diffraction peak intensity IFe4N (111) of a (111) crystal plane of Fe4N and X-ray diffraction peak intensity IFe3N (111) of a (111) crystal plane of Fe3N, which are measured on a surface of the nitrided steel member by X-ray diffraction, an intensity ratio expressed by IFe4N (111)/{IFe4N (111)+IFe3N (111)} is 0.5 or more; Vickers hardness of the iron nitride compound layer is 900 or less, Vickers hardness of a base metal immediately under the iron nitride compound layer is 700 or more, and a difference between the Vickers hardness of the iron nitride compound layer and the Vickers hardness of the base metal is 150 or less; and a thickness of the iron nitride compound layer is 2 to 17 ?m.
    Type: Application
    Filed: April 17, 2013
    Publication date: February 26, 2015
    Inventors: Yuichiro Shimizu, Atsushi Kobayashi, Susumu Maeda, Masao Kanayama, Hideki Imataka, Masato Yuya, Yuya Gyotoku, Kiyotaka Akimoto
  • Patent number: 8951365
    Abstract: A steel which is excellent in delayed fracture resistance containing, by mass %, C: 0.10 to 0.55%, Si: 0.01 to 3%, and Mn: 0.1 to 2%, further containing one or more of Cr: 0.05 to 1.5%, V: 0.05 to 0.2%, Mo: 0.05 to 0.4%, Nb: 0.001 to 0.05%, Cu: 0.01 to 4%, Ni: 0.01 to 4%, and B: 0.0001 to 0.005%, and having a balance of Fe and unavoidable impurities, the structure being a mainly tempered martensite structure, the surface of the steel being formed with (a) a nitrided layer having a certain thickness range and a nitrogen concentration higher than the nitrogen concentration of the steel by 0.02 mass % or more and (b) a low carbon region having a certain depth range from the surface of the steel and having a carbon concentration of 0.9 time or less the carbon concentration of the steel.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: February 10, 2015
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Daisuke Hirakami, Tetsushi Chida, Toshimi Tarui
  • Publication number: 20150036959
    Abstract: A rolling bearing (6), in particular for the mounting of the shaft of a turbocharger, which rolling bearing includes a bearing ring (1) and a number of rolling bodies (9). The bearing ring (1) is formed from a steel which comprises, as alloy constituents, 0.05 to 0.65 wt % carbon, 0.5 to 5.0 wt % chromium, up to 1.0 wt % molybdenum, up to 1.0 wt % vanadium, and up to 1.0 wt % aluminum. The surface of the bearing ring (1) has a hardened surface layer (2) which comprises nitrites and which comprises a diffusion layer (3) and a connecting layer (4) situated above said diffusion layer. The surface layer (2) has a thickness of up to 1 mm. The invention also relates to a method for producing a corresponding bearing ring (6).
    Type: Application
    Filed: March 4, 2013
    Publication date: February 5, 2015
    Applicant: Schaeffler Technologies GmbH & Co. KG
    Inventors: Ernst Strian, Peter Gebauer, Heiko Schmidt, Oliver Graf-Goller
  • Publication number: 20150038380
    Abstract: This gear has a predetermined chemical composition and has, in a surface-layer part, a texture of tempered martensite and/or tempered bainite and a steel material texture in which retained austenite exists in 1-10% by area percentage and in which a carbide is deposited in at least 5% by area percentage, and the nitrogen content at a depth of 20 ?m below the surface is 2.0-6.0%. Thus, a gear that achieves even better seizing resistance in a power transmission part subjected to high rotation and high slippage and using a low-kinematic-viscosity lubricating oil is provided.
    Type: Application
    Filed: March 29, 2013
    Publication date: February 5, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO(KOBE STEEL, LTD.)
    Inventors: Sayaka Nagamatsu, Yosuke Shindo
  • Publication number: 20150030406
    Abstract: A hard and wear resistant coating for a body includes at least one metal based nitride layer having improved high temperature performance. The layer is (Zr1-x-zSixMez)Ny with 0<x<0.30, 0.90<y<1.20, 0?z<0.25, and Me is one or more of the elements Y, Ti, Nb, Ta, Cr, Mo, W and Al, comprised of a single cubic phase, a single hexagonal phase or a mixture thereof, with a cubic phase of a sodium chloride structure and a thickness between 0.5 ?m and 15 ?m. The layer is deposited using cathodic arc evaporation and is useful for metal cutting applications generating high temperatures.
    Type: Application
    Filed: March 6, 2013
    Publication date: January 29, 2015
    Inventors: Jon Andersson, Rickard Forsen, Naureen Ghafoor, Mats Johansson Jöessar, Magnus Oden
  • Publication number: 20150027591
    Abstract: A steel material for nitriding has a composition comprising, by mass percent, C: more than 0.15% and not more than 0.35%, Si?0.20%, Mn: 0.10 to 2.0%, P?0.030%, S?0.050%, Cr: 0.80 to 2.0%, V: 0.10 to 0.50%, Al: 0.01 to 0.06%, N?0.0080%, O?0.0030%, and optionally one or more elements of Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, the balance being Fe and impurities. The composition satisfies the conditions of [20?(669.3×logeC?1959.6×logeN?6983.3)×(0.067×Mo+0.147×V)?80] and [140×Cr+125×Al+235×V?160]. The microstructure is a ferritic-pearlitic structure, a ferritic-bainitic structure, or a ferritic-pearlitic-bainitic structure. The area fraction of ferrite is 20% or more and the precipitate content of V is 0.10% or less.
    Type: Application
    Filed: February 4, 2013
    Publication date: January 29, 2015
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yuya Gyotoku, Masayuki Horimoto, Hideki Imataka, Kosuke Tanaka
  • Publication number: 20150020926
    Abstract: According to the present invention, it is possible to obtain steel for nitrocarburizing having a predetermined chemical composition, a bainite area ratio exceeding 50% and excellent machinability by cutting before nitrocarburizing, and having strength and toughness equivalent to conventional steel, such as SCr420 carburized steel material, and excellent fatigue properties after nitrocarburizing.
    Type: Application
    Filed: February 15, 2013
    Publication date: January 22, 2015
    Inventors: Takashi Iwamoto, Keisuke Ando, Kunikazu Tomita, Yasuhiro Omori, Kiyoshi Uwai, Shinji Mitao
  • Publication number: 20150000795
    Abstract: Provided is a case hardening steel which allows effective inhibition of abnormal grain growth during carburizing treatment or the like and makes it possible to solve the problem of abnormal grain growth-induced reduction in characteristics. In the case hardening steel, a total amount of TiC, ZrC and AlN which are precipitate particles contained in 100 g of a steel material after subjecting the case hardening steel to hot rolling is 3.5×10?4 mole or less.
    Type: Application
    Filed: June 23, 2014
    Publication date: January 1, 2015
    Applicant: DAIDO STEEL CO., LTD.
    Inventors: Kyohei NAKAYAMA, Yasuaki SAKAI, Toshiyuki MORITA, Keisuke INOUE
  • Patent number: 8920581
    Abstract: Nitriding process of a steel strip is performed. Next, annealing is performed to form a forsterite based glass coating film at a surface of the steel strip. Heating is performed up to 1000° C. or more in a mixed gas atmosphere containing H2 gas and N2 gas, and a rate of N2 gas is 20 volume % or more, next, the atmosphere is switched into H2 gas atmosphere at the temperature of 1000° C. or more and 1100° C. or less, when the annealing is performed. An oxygen potential P (H2O)/P (H2) is set to be 0.05 to 0.3 when the temperature is 850° C. or less during the heating in the mixed gas atmosphere.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: December 30, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Yoshiaki Natori, Shuichi Yamazaki, Fumiaki Takahashi, Seiki Takebayashi
  • Publication number: 20140373978
    Abstract: This case hardened steel has a composition including, in mass %: C: 0.05 to 0.45%; Si: 0.01 to 1.0%; Mn: over 0 to 2.0%; Al: 0.001 to 0.06%, N: 0.002 to 0.03%, S: over 0 to 0.1%, P: over 0 to 0.05%; and balance: Fe and inevitable impurities. Equation (1) described below and Equation (2) described below are satisfied in equiaxed zone, or Equation (3) described below is satisfied in columnar zone. Re=(Ae/Ao)×100?30%??Equation (1) (Cmin,1/Co)?0.95??Equation (2) (Cmin,2/Co)?0.
    Type: Application
    Filed: October 29, 2012
    Publication date: December 25, 2014
    Inventors: Kohichi Isobe, Masahiko Doe
  • Publication number: 20140352848
    Abstract: Disclosed are a method for adjusting the pore size of a porous metal material and the pore structure of a porous metal material. The method comprises: permeating at least one element into the surface of the pores of the material to generate a permeated layer on the surface of the pores, so that the average pore size of the porous material is reduced to within a certain range, thus obtaining a pore structure of the porous metal material having the pores distributed on the surface of the material and the permeated layer provided on the surface of the pores.
    Type: Application
    Filed: December 31, 2011
    Publication date: December 4, 2014
    Applicant: INTERMET TECHNOLOGIES CHENGDU CO., LTD.
    Inventors: Lin Gao, Yuehui He, Tao Wang, Bo Li
  • 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: 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
  • Patent number: 8876988
    Abstract: The present invention provides a steel for nitriding with a composition including, by mass %: C: 0.10% to 0.20%; Si: 0.01% to 0.7%; Mn: 0.2% to 2.0%; Cr: 0.2% to 2.5%; Al: 0.01% to less than 0.19%; V: over 0.2% to 1.0%; Mo: 0% to 0.54%; N: 0.001% to 0.01%; P limited to not more than 0.05%; S limited to not less than 0.2%; and a balance including Fe and inevitable impurities, the composition satisfying 2?[V]/[C]?10, where [V] is an amount of V by mass % and [C] is an amount of C by mass %, in which the steel for nitriding has a microstructure containing bainite of 50% or more in terms of an area percentage.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: November 4, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Tetsushi Chida, Manabu Kubota, Toshimi Tarui, Daisuke Hirakami, Masayuki Hashimura
  • 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
  • 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
  • Patent number: 8844140
    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: Grant
    Filed: October 27, 2011
    Date of Patent: September 30, 2014
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Oskar Beer, Franz-Josef Ebert, Gerhard Kreiselmeier, Edgar Streit
  • 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: 20140251507
    Abstract: The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and 0:0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300° C. of 650 or more.
    Type: Application
    Filed: April 14, 2014
    Publication date: September 11, 2014
    Applicant: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Atsushi Mizuno, Masayuki Hashimura, Kei Miyanishi, Shuji Kozawa
  • Publication number: 20140230968
    Abstract: Provided is maraging steel with which maraging steel that has been subjected to nitriding treatment has excellent fatigue strength and stable high strength. Maraging steel that has been subjected to nitriding treatment to a thickness of 0.5 mm or less and comprises, by mass %, 0.008% or less of C, 0.5% or less of Si, 0.5% or less of Mn, 0.5 to 1.5% of Cr, 16.0 to 22.0% of Ni, 3.0 to 7.0% of Co, and 3.0 to 7.0% of Mo is maraging steel further comprising, by mass %, 0.6 to 1.3% of Al and Fe and impurities as the balance, wherein the impurities are maintained at 0.01% or less of Ti, 0.01% or less of Nb, 0.01% or less of Ta, and 0.01% or less of W, the ratio of Al and Ti is Al/Ti>250, and by Vickers hardness, the surface hardness of the maraging steel is 800 to 1,050 HV and internal hardness of the maraging steel is 570 HV or less.
    Type: Application
    Filed: August 30, 2012
    Publication date: August 21, 2014
    Applicant: HITACHI METALS, LTD.
    Inventors: Katsuhiko Ohishi, Toshihiro Uehara, Ichiro Kishigami
  • 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
  • Patent number: 8808471
    Abstract: A martensitic stainless steel alloy is strengthened by copper-nucleated nitride precipitates. The alloy includes, in combination by weight percent, about 10.0 to about 12.5 Cr, about 2.0 to about 7.5 Ni, up to about 17.0 Co, about 0.6 to about 1.5 Mo, about 0.5 to about 2.3 Cu, up to about 0.6 Mn, up to about 0.4 Si, about 0.05 to about 0.15 V, up to about 0.10 N, up to about 0.035 C, up to about 0.01 W, and the balance Fe and incidental elements and impurities. The nitride precipitates may be enriched by one or more transition metals.
    Type: Grant
    Filed: April 13, 2009
    Date of Patent: August 19, 2014
    Assignee: QuesTek Innovations LLC
    Inventors: James A. Wright, Gregory B. Olson, Weijia Tang
  • Publication number: 20140182747
    Abstract: A method for treating a steel bearing component includes subjecting the steel bearing component to a scouring treatment to impart compressive residual stress to a surface region thereof and subsequently nitriding the steel bearing component 1. The resulting steel bearing component exhibits a nitrided case depth of about 0.002-0.014 inches and a compressive residual stress value greater than ?120 ksi is achieved at a depth of 0.002 inches and ?20 ksi to a minimum depth of 0.010?. The steel bearing component may be a race and/or a rolling element, such as a ball.
    Type: Application
    Filed: December 20, 2013
    Publication date: July 3, 2014
    Applicant: AKTIEBOLAGET SKF
    Inventors: Bryan A. McCoy, Gregory A. Zimmerman, Don L. Anthony, Mark A. Ragen
  • Patent number: 8753457
    Abstract: The present invention comprises a process for nitriding martensitic stainless steel and the alloy produced thereby comprising heating a stainless steel alloy to a temperature of from about 900° F. (480° C.) to about 2500° F. (1370° C.) in a vacuum furnace in the presence of hydrogen or argon gas in order to clean the surface. After the hydrogen or argon gas is removed from the chamber, nitrogen gas, or a different nitrogen gas derivative is injected into said furnace as a pulsed injection at a partial pressure of from about 500 torr to about 1000 torr. The steel is nitrogen alloyed at a temperature of from about 1400° F. (760° C.) to about 2200° F. (1205° C.) and then quickly quenched at ambient temperature. Preferably, after a sufficient period of time, the temperature is raised a second time from about 900° F. (480° C.) to about 2500° F. (1370° C.) prior to cooling the final product.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: June 17, 2014
    Inventor: Kenneth A. Moyer
  • Patent number: 8747574
    Abstract: Provided is a maraging steel strip which has such a composition that can reduce the content of TiN acting as the starting point of fatigue fracture in a high-cycle region, and the bending fatigue strength of which has been improved by the precipitation hardening effect yielded by precipitating coherent nitrides in the nitrided structure. A maraging steel strip produced by nitriding a managing steel which contains by mass, C: 0.01% or less, Si: 0.1% or less, Mn: 0.1% or less, P: 0.01% or less, S: 0.005% or less, Ni: 8.0 to 22.0%, Cr: 0.1 to 8.0%, Mo: 2.0 to 10.0%, Co: 2.0 to 20.0%, Ti: 0.1% or less, Al: 2.5% or less, N: 0.03% or less, and O: 0.005% or less, with the balance being Fe and unavoidable impurities, wherein Baker-Nutting orientation relationship with an orientation difference within 10° exists between the Cr nitride precipitated in the nitrided layer and the matrix martensite.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: June 10, 2014
    Assignee: Hitachi Metals, Ltd.
    Inventors: Katsuhiko Ohishi, Toshihiro Uehara
  • Patent number: 8747572
    Abstract: A carbonitriding method that allows the permeating rate of nitrogen to be increased to improve the efficiency of the carbonitriding process is directed to carbonitriding a workpiece formed of steel containing at least 0.8 mass % of carbon, including an atmosphere control step of controlling the atmosphere in a heat treatment furnace, and a heating pattern control step of controlling the temperature history applied to a workpiece. The atmosphere control step includes an undecomposed ammonia concentration control step of controlling the undecomposed ammonia concentration in the heat treatment furnace, and a partial pressure control step of controlling the partial pressure of at least one of carbon monoxide and carbon dioxide in the heat treatment furnace.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: June 10, 2014
    Assignee: NTN Corporation
    Inventor: Chikara Ohki
  • Patent number: 8709173
    Abstract: A thrust bearing component is formed of cold-reduced steel sheets and strip having surface roughness of Rmax?2 ?m and provided by cold rolling a high-carbon steel containing 0.9 wt % to 1.2 wt % of carbon, 1.2 wt % to 1.7 wt % of chrome, 0.1 wt % to 0.5 wt % of manganese, and 0.15 wt % to 0.35 wt % of silicon.
    Type: Grant
    Filed: August 2, 2011
    Date of Patent: April 29, 2014
    Assignee: NTN Corporation
    Inventors: Tomoaki Kawamura, Yasuyuki Watanabe, Kousuke Obayashi