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| Number | Title | Issue Date |
| 7367208 | Coil winding method for metal in bars Coil winding method for steel bars providing, at the outlet of the rolling mill (2), cooling stages by means of WB (4′, 4″, 4′″) and equallsation in air so as to perform “soft” hardening on the bar which generates a microstructure consistin... | 05/06/2008 |
| 7308813 | Clutch housing and method for manufacturing the same A method of manufacturing a clutch housing having a boss portion and a drum portion integrally provided with the boss portion, is characterized by steps of integrally forming the boss portion and the drum portion by hot forging, and forced-cooling at least a portion... | 12/18/2007 |
| 7070481 | Polishing method, polishing device, glass substrate for magnetic recording medium, and magnetic recording medium There are disclosed a polishing method and a polishing device in which cleaning of a glass substrate surface can be achieved to a high level. A glass substrate (MD substrate 1) in the shape of a circular disc having a circular hole in a center portion is poli... | 07/04/2006 |
| 6872264 | Road wheel composition and method for manufacturing road wheel using the same A road wheel composition having high surface hardness and high strength, which is manufactured by a heat treatment of a metal powder containing Fe as a main component, C, Si, Mn, P, S, Al, Ti, N, Cr, and B, and a method for manufacturing a road wheel for an automobi... | 03/29/2005 |
| 6723185 | Method for producing defects and tensile residual stresses A method, which is used to make controlled defects corresponding to natural flaws and residual stresses in various kinds of test pieces. Defects identical to natural flaws are required to qualify non-destructive testing (NDT) procedures. In the method, sequential, r... | 04/20/2004 |
| 6676777 | Postweld heat treatment process of carbon steel and low alloy steel The creep strength of a welded joint portion is improved, and damage of the welded joint portion based on the generation or development of cracks is suppressed. A postweld heat treatment process, wherein a welded joint made of carbon steel and low alloy s... | 01/13/2004 |
| 6585834 | Method for performing a heat treatment of metallic rings, and bearing ring thus obtained A method of performing a heat treatment on steel rings, in particular for bearings, whereby the outer surface and inner surface of a preheated ring are exposed to different flows of a cooling medium such that the regions of the ring adjacent those surface... | 07/01/2003 |
| 6569269 | Process for producing a high and low pressure integrated turbine rotor In CrMoV based heat resistant steels and tungsten-containing CrMoV based heat resistant steels, trace impurities, such as phosphorus, sulfur, copper, aluminum, arsenic, tin, and antimony are reduced lower than a specific level. Furthermore, alloy steels h... | 05/27/2003 |
| 6488788 | Flat plate member with a gear portion and a process for making the same A flat plate member with gear portion is formed to a predetermined shape by pressing a flat steel raw material having a composition comprising, by weight, 0.10-0.18% C, less than 0.03% Si, 0.60-1.50% Mn, less than 0.020% P, less than 0.013% S, 0.001-0.004... | 12/03/2002 |
| 6454884 | Method of manufacturing a vehicle structural beam A vehicle structural beam, such as a door intrusion beam, which possesses an elongate tubular beam part which at opposite ends is provided with mounting flanges for securement to a vehicle frame. The elongate tubular beam part and the flanges provided at ... | 09/24/2002 |
| 6436205 | Method for surface processing of a continuously cast steel product and device therefor In a surface processing method for removing surface flaws, surface contaminants, and the like from a continuously cast metal product in a hot state, at least a portion of at least one metal product surface is cooled for a defined temperature decrease of a... | 08/20/2002 |
| 6364972 | Method for selectively hardening a carbon steel screw A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied ... | 04/02/2002 |
| 6355119 | Heat treatment method for producing boundary-layer hardened long products and flat products of unalloyed or low-alloy steel In a heat treatment method for producing boundary layer-hardened long products and flat products of unalloyed or low-alloy steel, the workpiece is cooled for producing a martensitic grain within a boundary layer of the workpiece by repeating several seque... | 03/12/2002 |
| 6273974 | Selected heat treatment and hardening method for nails A selectively hardened nail includes a nail head, an elongated shank, and a tip. A portion of the nail shank is made harder than the remainder by selectively heat treating that portion, and cooling it. The nail has controlled bending properties. The selec... | 08/14/2001 |
| 6174389 | Fixture and method for selectively quenching a predetermined area of a workpiece An apparatus and method for excluding specific areas of a workpiece from quenching during a heat treat process. A workpiece, having preselected areas to be quenched, is positioned in a manner so that quench sprays are aimed toward the surface to be quench... | 01/16/2001 |
| 6092389 | High rate cooling furnace for metal strips In an apparatus that rapidly cools heat treated metal strips with a recirculating nitrogen-hydrogen cooling gas mixture having a hydrogen content which ranges between 15%-50%, and a recirculation circuit for the gas mixture having a fan for creating a flo... | 07/25/2000 |
| 6059903 | Method of cooling sectional girders A method of cooling section steel, particularly sectional steel girders, from rolling heat, wherein, prior to a final air cooling, a water cooling process is carried out in such a way that section steel portions with material concentrations are cooled at ... | 05/09/2000 |
| 6059899 | Press-formed article and method for strengthening the same A press-formed article has a quenched area and a required strength distribution. The quenched area has a hardness distribution exhibiting a hardness transition which corresponds to the required strength distribution. The press-formed article may include o... | 05/09/2000 |
| 6030471 | Method for producing a hardened wheel A specialized induction facility provides localized heating in only the desired wear areas of a crane wheel while leaving the supporting material "as-forged" and ductile. The wear area of a crane wheel is hardened such that flanges extending out from a wo... | 02/29/2000 |
| 5911844 | Method for forming a metallic material A method for drawing a portion of metallic material having a known hardness. The method includes the step of applying a localized heat treatment to predetermined portions of the metallic material. Additionally, the method comprises forming the localized h... | 06/15/1999 |
| 5879480 | Process for imparting residual compressive stresses to steel machine components A steel machine component, such as a bearing race, has a critical surface of generally circular configuration. Here the steel of the machine component exists in a state of compression to improve the physical characteristics of the surface. To this end, hi... | 03/09/1999 |
| 5814167 | Stamped-metal clip for use with an endless track belt cooperating with slide rails The stamped-metal clip is suitable for use with an endless track belt cooperating with slide rails. The clip comprises a main portion having a hardened bearing surface to be engaged against at least one of the slide rails. The bearing surface has a hardne... | 09/29/1998 |
| 5808233 | Amorphous-crystalline thermocouple and methods of its manufacture A thermocouple formed of a length of a single composition having first solid phase section adjoining a second solid phase section, and a transition therebetween. One method of making such thermocouples is to raise the temperature of the first solid phase ... | 09/15/1998 |
| 5800641 | Method of thermal or thermochemical treatment of precision steel components A method of thermal or thermochemical treatment of precision steel components having different wall thicknesses comprising the steps of a) hardening (8), b) low temperature cooling (9) and c) annealing (10), wherein the precision steel components are subj... | 09/01/1998 |
| 5759309 | Thermal process for selectively hardening track chain links A process for selectively hardening a forged track chain link has the following steps. A forged track chain link having a pad portion, a rail portion, a first side portion and a second side portion, is provided. A quench tank is provided and adapted for s... | 06/02/1998 |
| 5733391 | Quenching method Thermal insulating gaseous blankets, generated by contact of a quench liquid with a hot metal workpiece, are displaced from downwardly directed surfaces by sequentially elevating the workpiece, at points about its periphery, so as to promote migration of ... | 03/31/1998 |
| 5710405 | Method for developing residual compressive stress in stainless steel and nickel base superalloys Compressive residual stresses can be developed by underwater plasma transferred arc welding. The development of these compressive stresses act to prevent hot cracking and He embrittlement that can develop during welding or stress corrosion cracking that c... | 01/20/1998 |
| 5667605 | Method of fabrication of a piece of structural steel, and the steel fabricated thereby The invention relates to a method for fabricating a piece of structural steel that includes thermal or thermomechanical treatment steps that could ordinarily lower the fatigue strength and shock and impact resistance of the steel piece. In the method of t... | 09/16/1997 |
| 5553106 | Residual stress improving method for members in reactor pressure vessel Low temperature water in a low temperature water tank 12 installed outside a reactor pressure vessel 9 is pumped by a high pressure pump 15 and supplied through a conductor 17 under pressure. The supplied water is ejected, as a stream of cold water jet 8,... | 09/03/1996 |
| 5419792 | Method and apparatus for cooling a workpiece Cooling of a workpiece is conducted at selected workpiece locations in accordance with predetermined heat flux, at the locations, required to result in a desired workpiece cooling rate for workpiece integrity, microstructure and mechanical properties. A c... | 05/30/1995 |
| 5390900 | Metal strip cooling system An apparatus and method for cooling a metal strip, the apparatus having a header that receives and directs a curtain of water across the strip, a water collector on one side of the curtain of water and a source of air on the opposite side of the curtain o... | 02/21/1995 |
| 5137586 | Method for continuous annealing of metal strips An improved method of heat treating a continuous strip of metallic material of indeterminate length in a continuous annealing furnace. The furnace includes a heating section having a plurality of gas jet heaters and a cooling section having a plurality of... | 08/11/1992 |
| 5104462 | Scanning induction hardening process by using radially moving induction coil A scanning induction hardening process in which a steel workpiece is surface hardened by progressively traversing its length with an inductor coil energized by an alternating electric current and immediately thereafter quenching the heated portion of the ... | 04/14/1992 |
| 5000798 | Method for shape control of rail during accelerated cooling A method and apparatus for controlling the shape of a hot railroad rail during accelerated cooling of the rail head. The railroad rail is cooled along its web-base junction at a rate which achieves a pre-selected degree of shape control, while avoiding ov... | 03/19/1991 |
| 4877463 | Method for producing rolled steel products, particularly threaded steel tension members To produce threaded steel tension members, steel is used with a C-content of 0.50 to 0.80%, preferably 0.75%, a Si-content of 0.20 to 0.50%, preferably 0.25%, and a Mn content of 0.30 to 0.80%, preferably 0.60%. Exiting from the rolling heat at the outlet... | 10/31/1989 |
| 4867810 | Method and apparatus for hardening cam lobes on a camshaft A method and apparatus for inductively heating in an inductor and quench hardening the finished ground cam lobes of steel camshafts to a uniform shallow pattern depth with minimal lobe surface deformation. The inductor is shaped to correspond to the conto... | 09/19/1989 |
| 4842655 | Process for improving resistance of metal bodies to stress corrosion cracking A process for improving resistance of pressure vessel shells, tubesheets, tubes, pipes, pipe fittings and machine parts to stress corrosion cracking comprising heating at least those portions of such bodies subject to danger by stress corrosion cracking t... | 06/27/1989 |
| 4810311 | Process for manufacturing a high strength rail Starting from a temperature at or above the A3 transformation point of the steel of the rail, the head of the rail is cooled to a temperature not lower than the Ms point at a rate lower than the critical quenching rate so that the head acquires... | 03/07/1989 |
| 4769092 | Variable cooling device for turbo engine wall parts Device for the differential cooling or temperature control of inside and outside walls or wall areas of a component, more particularly of a turbomachine component. The device has nozzle arrays or spray pipes under locally separate and/or phased control fo... | 09/06/1988 |
| 4737202 | Method of producing steel components that simultaneously have high strength and high ductility and which retain these properties even after a hot forming operation A steel with a carbon content of less than 0.3 percent by weight is used for steel-based components which are subjected to hot forming. A predominantly lower bainite structure is achieved by controlled cooling. The advantage is that components, such as tr... | 04/12/1988 |
