| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 148316000 | Carburized or nitrided | 35 |
| 20130160899 | GEAR - The problem of the present invention involves providing a gear that has high tooth-root bending strength and for which there is no chipping of the tips of the teeth. Accordingly, the surface of the gear is carburized and the gear is strengthened by imparting residual stress, with the residual stress in the region with a surface depth of 5 μm to 20 μm being −1000 MPa or less, and the residual stress in the region with a surface depth of 50 μm to 150 μm being −1000 MPa or greater. | 06-27-2013 |
| 148317000 | Nitrided | 26 |
| 20140216608 | METHOD FOR COOLING METAL PARTS HAVING UNDERGONE A NITRIDING/NITROCARBURISING TREATMENT IN A MOLTEN SALT BATH, UNIT FOR IMPLEMENTING SAID METHOD AND THE TREATED METAL PARTS - Before the end of the treatment of metal parts in a molten salt bath nitriding/nitrocarburizing station, a chamber, arranged so that the oxygen contained in the chamber can be discharged in order to create an inert atmosphere, is filled with a refrigerant in liquid form and with a strong capacity for volume expansion as it evaporates. All the parts treated are transferred into the chamber. The chamber is closed, and the parts are left in the chamber for a preset length of time to reach a temperature at which the salt congeals and forms a protective barrier. The parts are then removed and subjected to a rinsing operation. | 08-07-2014 |
| 148318000 | Ferrous (i.e., iron base) | 25 |
| 20090038713 | ROLLING APPARATUS - A rolling apparatus including an external member having a raceway surface on an inner peripheral surface thereof, an internal member having a raceway surface on an outer peripheral surface thereof, and a plurality of rolling elements which are rotatably provided between the raceway surface of the external member and the raceway surface of the internal member. A surface of at least one of the internal member, the external member, and the rolling elements is subjected to carbonitriding or nitriding; an area percentage of a nitride containing Si and Mn is 1% or more and 20% or less; surface hardness is HV750 or more. When depth from the raceway surface or depth from a rolling surface of the rolling element is defined as Z and diameter of the rolling element is defined as d, hardness at Z=0.045 d is HV650 to 850, and hardness at Z=0.18 d is HV400 to 800. | 02-12-2009 |
| 20090056835 | Pair of guiding elements of which one is made of specific steel leading to improved anti-seizing performances - A pair of guiding elements is characterized in that at least one of its elements is made of a steel containing at least 0.15 to 0.3% by weight of carbon, 2 to 5% (preferably 2 to 3%) by weight of chromium, at least 0.45% (preferably no greater than 0.9%) by weight of molybdenum, and at least 0.01% by weight and no greater than 0.5% (preferably no greater than 0.3%) of vanadium. This steel is nitrided after being shaped whereby obtaining a compound layer consisting of iron and nitrogen atoms of a thickness ranging from 5 to 50 micrometers. The steel can also contain 0.4% to 1.5% by weight of manganese. | 03-05-2009 |
| 20090283181 | STEEL WIRE FOR HARD DRAWN SPRING EXCELLENT IN FATIGUE STRENGTH AND RESISTANCE TO SETTLING, AND HARD DRAWN SPRING - Disclosed is a hard-drawn spring which exhibits fatigue strength and sag resistance equal or superior to springs produced using an oil-tempered wire. The hard-drawn spring is produced using a steel wire containing 0.5 to 0.7 mass % of C, 1.0 to 1.95 mass % of Si, 0.5 to 1.5 mass % of Mn and 0.5 to 1.5 mass % of Cr, with the balance being Fe and inevitable impurities. In the steel wire, the number of carbides having circle-equivalent diameters of 0.1 μm or more is 5 particles/100 μm | 11-19-2009 |
| 20100108199 | Ferrous abrasion resistant sliding material - A ferrous abrasion resistant sliding material capable of improving seizing resistance, abrasion resistance and heat crack resistance is provided. The ferrous abrasion resistant sliding material has a martensite parent phase which forms a solid solution with carbon of 0.15 to 0.5 wt %, and the martensite parent phase contains one or more types of each special carbide of Cr, Mo, W and V dispersed therein in a total content of 10 to 50% by volume. | 05-06-2010 |
| 20100314005 | HIGHLY CORROSION-RESISTANT MEMBER AND MANUFACTURING PROCESS FOR THE SAME - A highly corrosion-resistant member that is equipped with: a substrate made of stainless steel; an intermediate layer coated on at least a part of a surface of the substrate; and an amorphous carbon film coated on at least a part of a surface of the intermediate layer is completed by forming the intermediate layer and amorphous carbon film at such a low temperature that a temperature of the surface of the substrate is 450° C. or less. Another highly corrosion-resistant member that is equipped with: a substrate made of stainless steel, substrate whose superficial-layer portion is subjected to nitriding treatment; and an amorphous carbon film coated on at least a part of a surface of the superficial-layer portion is completed by carrying out the nitriding treatment and a formation of the amorphous carbon film at such a low temperature that a temperature of a surface of said substrate is 450° C. or less. | 12-16-2010 |
| 20110041959 | STEEL FOR MACHINE STRUCTURE USE FOR SURFACE HARDENING AND STEEL PART FOR MACHINE STRUCTURE USE - Steel for machine structure use for surface hardening containing, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 1.5% to 3.0%, W: 0.0025 to 0.5%, Al: 0.001 to 0.5%, N: 0.003 to 0.02%, S: 0.0001 to 0.025%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, having an Mn/S of 70 to 30000, and having a balance of substantially Fe and unavoidable impurities. | 02-24-2011 |
| 20110120596 | Manufacturing process of a structural component for a motor vehicle, plate bar for hot forming and structural component - 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. | 05-26-2011 |
| 20110186182 | STEEL FOR NITROCARBURIZING AND NITROCARBURIZED PARTS - The present invention relates to a steel material giving more effective case hardening for improving the fatigue strength and is characterized by containing, by mass %, C: 0.01 to 0.3%, Si: less than 0.1%, Mn: 0.4 to 3%, Cr: 0.5 to 3%, and Al: 0.01 to 0.3%, further containing one or both of Mo: 0.2 to 1.5%, and V: 0.05 to 1.0%, having a balance of Fe and unavoidable impurities, and comprising a structure having 50% or more of bainite. | 08-04-2011 |
| 20120031529 | MARAGING STEEL STRIP - 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. | 02-09-2012 |
| 20120080122 | Steel for nitriding use and nitrided part - The present invention lowers the strength before nitriding to improve the machinability, while deepens the effective hardened case of the nitrided case for improving the fatigue strength. It provides steel for nitriding use containing, by mass %, C: 0.05 to 0.30%, Si: 0.003 to 0.50%, Mn: 0.4 to 3.0%, Cr: 0.2 to 0.9%, Al: 0.19 to 0.70%, V: 0.05 to 1.0%, and Mo: 0.05 to 0.50%, having contents of Al and Cr satisfying 0.5%≦1.9Al+Cr≦1.8%, and having a balance of Fe and unavoidable impurities. | 04-05-2012 |
| 20120168035 | STEEL FOR MACHINE STRUCTURAL USE, MANUFACTURING METHOD FOR SAME, CASE HARDENED STEEL COMPONENT, AND MANUFACTURING METHOD FOR SAME - Disclosed is a steel for machine structural use including 0.05-0.8% of C, 0.03-2% of Si, 0.2-1.8% of Mn, 0.1-0.5% of Al, 0.0005-0.008% of B, and 0.002-0.015% of N, and including 0.03% of P or less (excluding 0%), 0.03% of S or less (excluding 0%), and 0.002% of 0 or less (excluding 0%), with the remainder comprising iron and unavoidable impurities. The ratio of BN/A1N precipitated in the steel is 0.020-0.2. Also disclosed is a case hardened steel component in which the ratio of BN/AlN deposited on the carburized or carbonitrided component surface is 0.01 or less and a manufacturing method for same. The steel for machine structural use exhibits excellent machinability in continuous cutting at high speeds using cemented carbide tools, and in interrupted cutting at low speeds using high-speed steel tools, as well as excellent impact performance, even after being subjected to a heat treatment such as quenching and tempering. Furthermore, the case hardened steel component exhibits excellent fatigue resistance, and particularly excellent pitting resistance. | 07-05-2012 |
| 20130087250 | STEEL FOR NITRIDING AND NITRIDED PART - 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. | 04-11-2013 |
| 20130220489 | STEEL FOR MACHINE STRUCTURE USE FOR SURFACE HARDENING AND STEEL PART FOR MACHINE STRUCTURE USE - Steel for machine structure use for surface hardening containing, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 1.5% to 3.0%, W: 0.0025 to 0.5%, Al: 0.001 to 0.5%, N: 0.003 to 0.02%, S: 0.0001 to 0.025%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, having an Mn/S of 70 to 30000, and having a balance of substantially Fe and unavoidable impurities. | 08-29-2013 |
| 20140000764 | PLASTIC PROCESSING COMPONENT WITH MODIFIED STEEL SURFACE | 01-02-2014 |
| 20140034194 | STEEL FOR NITRIDING AND NITRIDED COMPONENT - A steel for nitriding having 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+0.47≦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 steel is easily subjected to cutting before nitriding and suitable for use as an automobile ring gear. The nitrided component having a surface hardness of 650-900 HV, core hardness being ≧150 HV, and 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. | 02-06-2014 |
| 20140230968 | MARAGING STEEL - 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. | 08-21-2014 |
| 20140251507 | STEEL FOR SURFACE HARDENING FOR MACHINE STRUCTURAL USE AND PART FOR MACHINE STRUCTURAL USE - 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. | 09-11-2014 |
| 20140373978 | CASE HARDENED STEEL HAVING REDUCED THERMAL TREATMENT DISTORTION - 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. | 12-25-2014 |
| 20150020926 | STEEL FOR NITROCARBURIZING AND NITROCARBURIZED COMPONENT USING THE STEEL AS MATERIAL - 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. | 01-22-2015 |
| 20150027591 | STEEL MATERIAL FOR NITRIDING AND NITRIDED COMPONENT - 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×log | 01-29-2015 |
| 20150059933 | STEEL FOR COLD FORGING/NITRIDING, STEEL MATERIAL FOR COLD FORGING/NITRIDING, AND COLD-FORGED/NITRIDED COMPONENT - 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×log | 03-05-2015 |
| 20150083279 | NITROCARBURIZED CRANKSHAFT MEMBER AND STEEL FOR NITROCARBURIZED CRANKSHAFTS - 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 μm that is formed during establishment of a diffusion depth of a nitrogen diffusion zone below the surface compound layer of 700 μm or greater. | 03-26-2015 |
| 20150107723 | PARTIALLY CARBONITRIDING HEAT TREATED STAINLESS STEEL FERRULE AND MANUFACTURING METHOD THEREOF - 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. | 04-23-2015 |
| 20150376763 | NON-THERMAL REFINED SOFT-NITRIDED COMPONENT - Provided is a non-thermal refined soft-nitrided component including chemical composition of a steel material of a base metal containing: in mass %, C: 0.25 to 0.40%; Si: 0.10 to 0.35%; Mn: more than 2.0% to 2.8% or less; N: 0.0030 to 0.0250%; Cu: 0 to 1.0%; Mo: 0 to 0.3%; Ni: 0 to 0.5%; Ti: 0 to 0.020%; and a balance being Fe and impurities, the impurities including P: 0.08% or less; S: 0.10% or less; Al: 0.05% or less; and Cr: less than 0 20%, wherein a Vickers hardness at a position of 0.05 mm from the surface is 400 to 480, a Vickers hardness at a position of 1.0 mm from the surface is 200 or more, and a compound-layer depth at a stress concentrated region is 5 μm or less. This non-thermal refined soft-nitrided component has an excellent bending straightening property and a high fatigue strength. | 12-31-2015 |
| 20160060744 | CASE-HARDENING STEEL AND CASE-HARDENED STEEL MEMBER - There is provided a case-hardening steel in which in inclusion evaluation using an extreme value statistical method, when an estimated area S is 30,000 mm | 03-03-2016 |
| 148319000 | Ferrous (i.e., iron base) | 8 |
| 20090301608 | Carburized and induction-hardened component - A steel component formed by carburizing and then induction-hardening of a steel consisting essentially of, by mass, C: minimum 0.08% and less than 0.3%; Si: maximum 2.0%; Mn: from 0.2% to 3.0%; P: maximum 0.03%; S: from 0.005% to 0.05%; Ni: maximum 1.5%; Cr: maximum 3.0%; Mo: maximum 1.0%; O: maximum 0.0025%; and N: from 0.005% to 0.03%; and further including either or both of, by mass, Al: from 0.005% to 0.05%, and Ti: from 0.005% to 0.05%; and still further including either or both of, by mass, V: maximum 0.3%, and Nb: maximum 0.3%; and a balance including Fe and unavoidable impurities. The hardness of the surface layer is at least 55 HRC and the hardness of the core portion is from 20 to 50 HRC. The core portion does not include a martensite structure. | 12-10-2009 |
| 20100200122 | Case hardenable nickel-cobalt steel - An advanced secondary hardening carburized Ni—Co steel achieves an improved case hardness of about 68-69 Rc together with nominal core hardness of about 50 Rc. | 08-12-2010 |
| 20120060979 | CARBURIZED STEEL PART HAVING EXCELLENT LOW CYCLE BENDING FATIGUE STRENGTH - A carburized steel part having excellent low cycle bending fatigue strength which is comprised of a steel material which contains, by mass %, C: 0.1 to 0.6%, Si: 0.01 to 1.5%, Mn: 0.3 to 2.0, P: 0.02% or less, S: 0.001 to 0.15%, N: 0.001 to 0.03%, Al: 0.001 to 0.06%, and O: 0.005% or less and has a balance of substantially iron and unavoidable impurities and which is carburized and quenched, and then tempered, which steel part has a surface hardness of HV550 to HV800 and a core hardness of HV400 to HV500. | 03-15-2012 |
| 20120145283 | CARBURIZATION HEAT TREATMENT METHOD AND METHOD OF USE - Disclosed is a carburization heat treatment method including carburizing a workpiece at a relatively low temperature within a temperature range of A | 06-14-2012 |
| 20120318408 | STEEL PART EXCELLENT IN TEMPER SOFTENING RESISTANCE - The present invention relates to a steel part securing temper softening resistance at 300° C. characterized by (a) the content of Si in the steel being made 0.7% or more, (b) the content of C in the carburized layer being made 0.9 to 1.1% for a hyper eutectic content of C by carburization, (c) the carbides with an outside diameter of 0.1 μm or more (proeutectoid cementite or spherical carbides) not being allowed to be present after carburization, and (d) the amount of residual austenite after carburization, quenching, and tempering being made less than 30%. | 12-20-2012 |
| 20130032251 | METHOD OF PROCESSING STEEL AND STEEL ARTICLE - A method of processing steel includes carburizing a martensitic stainless steel work piece to produce a carburized case by utilizing in combination, (i) a composition of the martensitic stainless steel work piece, (ii) a preselected carbon concentration in the carburized case, and (iii) a preselected grain size of the martensitic stainless steel work piece such that the carburized case predominately forms carbides of composition M | 02-07-2013 |
| 20130340895 | CARBURIZED STEEL PART HAVING EXCELLENT LOW CYCLE BENDING FATIGUE STRENGTH - A carburized steel part having excellent low cycle bending fatigue strength which is comprised of a steel material which contains, by mass %, C: 0.1 to 0.6%, Si: 0.01 to 1.5%, Mn: 0.3 to 2.0, P: 0.02% or less, S: 0.001 to 0.15%, N: 0.001 to 0.03%, Al: 0.001 to 0.06%, and O: 0.005% or less and has a balance of substantially iron and unavoidable impurities and which is carburized and quenched, and then tempered, which steel part has a surface hardness of HV550 to HV800 and a core hardness of HV400 to HV500. | 12-26-2013 |
| 20160145732 | CARBURIZED COMPONENT - The present invention provides a carburized part having a total amount of TiC, AlN and ZrC, which are precipitate particles, of 4.5×10 | 05-26-2016 |
