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| Number | Title | Issue Date |
| 8128761 | Carbonitriding method, machinery component fabrication method, and machinery component A carbonitriding method that can improve the nitrogen permeating rate to render the carbonitriding process effective is directed to carbonitriding a workpiece formed of steel that contains at least 0.8 mass % of carbon by heating in an atmosphere including ammonia, ... | 03/06/2012 |
| 7846272 | Treated austenitic steel for vehicles A treated austenitic steel and method for treating same includes an austenitic steel and a non-metal chemical element incorporated into a surface of the steel. The surface has a bi-layered structure of a compound layer at a top and an underlying diffusion layer, whi... | 12/07/2010 |
| 7550049 | Method for under-pressure carburizing of steel workpieces The subject of this invention relates to method carburizing of steel products, mainly parts of machines, vehicles and every mechanical apparatus, in vacuum furnaces under reduced pressure and elevated temperature. The method of under-pressure carburizing of steel wo... | 06/23/2009 |
| 7431778 | Case-hardening of stainless steel The invention relates to case-hardening of a stainless steel article by means of gas including carbon and/or nitrogen, whereby carbon and/or nitrogen atoms diffuse through the surface into the article. The method includes activating the surface of the article, apply... | 10/07/2008 |
| 7422643 | Rolling element and method of producing the same There is provided an inexpensive rolling element used under high interface pressure such as induction hardened gears, the rolling element being improved in the seizure resistance of its tooth flanks and having a temper hardness of HRC 50 or more at 300° C. To this ... | 09/09/2008 |
| 7384488 | Method for producing gears and/or shaft components with superior bending fatigue strength and pitting fatigue life from conventional alloy steels A conventional aluminum killed alloy steel for case hardening of gear(s) and/or shaft components consisting of 0.10 to 0.30 weight % Carbon, 0.15 to 0.35 weight % Silicon, 0.8 to 1.5 weight % Chromium, 0.6 to 1.5 weight % Manganese, 0.017 to 0.040 weight % Aluminum,... | 06/10/2008 |
| 7357697 | Superhard material article of manufacture The invention relates to abrasive water jet systems comprising an abrasive water jet mixing tube having a longitudinal bore lined with a superhard material, including such systems which use cubic boron carbide (CBN), diamond, or other materials with a hardness great... | 04/15/2008 |
| 7238244 | Nitriding of iron and steel parts in salt bath having improved corrosion resistance A new nitriding process by using a salt bath to produce iron and steel parts having excellent abrasion resistance and corrosion resistance includes forming an iron lithium complex oxide layer at the outermost surface of the iron part by immersing the iron and steel ... | 07/03/2007 |
| 7208052 | Method for carburizing steel components A carburizing process for increasing the hardness of a case region of a steel component. In one form the application includes plating the outer surface of a stainless steel component with nickel prior to carburizing. One component includes a stainless steel object h... | 04/24/2007 |
| 7186304 | Carbo-nitrided case hardened martensitic stainless steels A carbo-nitriding process for forming a martensitic stainless steel, which is case hardened and superior corrosion resistance over carburized process, is provided. A process for forming a martensitic stainless steel which is case hardened is provided. The process co... | 03/06/2007 |
| 7112248 | Vacuum carbo-nitriding method A vacuum carbonitriding method includes: performing a vacuum carburizing process on an object to be treated (a workpiece) in a heat treating furnace under reduced pressures by supplying a carburizing gas into the furnace that has been heated to a predetermined carbu... | 09/26/2006 |
| 7108756 | Method for heat-treating work pieces made of temperature-resistant steels A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reduction step, so that no depassiva... | 09/19/2006 |
| 6969430 | Process and apparatus for producing atmosphere for high productivity carburizing This invention is directed to a process and apparatus for producing high productivity carburizing. A process is introduced that uses a gas mixture made up of CO, H2, CO2, H2O, CH4 and N2, such that the product o... | 11/29/2005 |
| 6948247 | Method for forming a bearing race for a cylindrical bearing A cylindrical roller bearing or needle roller bearing for use with a rolling raceway surface is subjected to a carbonitriding treatment to produce a layer containing 30 to 80% retained austenite in the vicinity of its surface that contacts a carburized layer of a ro... | 09/27/2005 |
| 6924454 | Method of making an abrasive water jet with superhard materials Methods for making abrasive water jet mixing tubes with superhard materials are presented. Also presented are methods for making a tubular elongate superhard material bodies. ... | 08/02/2005 |
| 6908688 | Graded composite hardmetals A multiple-region hardmetal tool piece. The tool piece includes a hardmetal body including a hard particle component and a binder; an additional body, the additional body including a hardmetal body having a hard particle component and a binder; a metal body or a cer... | 06/21/2005 |
| 6846367 | Heat-treating method for improving wear-resistance and corrosion-resistance of chromium-plated steel substrate Disclosed is a method for improving the wear- and corrosion-resistance of a chromium-plated steel substrate by heat-treating the chromium-plated steel substrate under optimum conditions to inhibit a drop in corrosion-resistance of a steel substrate due to fine crack... | 01/25/2005 |
| 6656293 | Surface treatment for ferrous components A method for treating a surface of a first component wherein at least a portion of the surface of the first component contacts a surface of a second component. The method includes forming a compound layer at at least a portion of the surface of the first ... | 12/02/2003 |
| 6623567 | Method for high concentration carburizing and quenching of steel and high concentration carburized and quenched steel part A method for high concentration carburizing and quenching of steel is provided which is carried out by a treatment process including the steps of carbonitriding the steel at temperatures of from about 800 to about 880° C., and subsequently quenching the ... | 09/23/2003 |
| 6454880 | Material for die casting tooling components, method for making same, and tooling components made from the material and process Multi-layer material for die cast tooling component includes a low to medium carbon steel with alloying amounts of vanadium, manganese and molybdenum, quenched to at least 10 Bar and nitrocarburized to achieve a multiple layer structure with at least an o... | 09/24/2002 |
| 6447619 | High surface pressure resistant steel parts and methods of producing same High surface pressure resistant steel parts and their producing methods are disclosed. These steel parts are useful as gears, cams, bearings and similar high-strength compact steel articles which are required to have wear resistance and strength to withst... | 09/10/2002 |
| 6406560 | Method for the thermal treatment of metal A method is provided for the thermal treatment of metal workpieces in a gas atmosphere containing nitrogen, in particular for nitrocarburizing iron articles. In order to obtain enhanced resistance to wear and corrosion in the treated workpieces, the nitro... | 06/18/2002 |
| 6328819 | Method and use of an apparatus for the thermal treatment, in particular nitriding treatment, of metal workpieces A method is provided for heat treatment of metal workpieces obtain a substantially uniform nitride layer, even in workpieces comprising high alloy iron articles. The following method steps are provided: a) heating the workpieces to a temperature between 400° ... | 12/11/2001 |
| 6309475 | Rolling element and producing method For easily producing a toothed material for high-strength gears etc. with a plastic working technique, deformation resistance occurring in plastic working is reduced and stable high precision plastic working is enabled at lower temperatures. One or more t... | 10/30/2001 |
| 6258179 | Carburized parts, method for producing same and carburizing system A carburizing method is described which is capable of dispersing cementite grains in the surface of steel uniformly and finely as not to affect fatigue strength and capable of fining the crystal grains of austenite. To prevent cementite precipitation duri... | 07/10/2001 |
| 6248186 | Ball-and-roller bearing and method of manufacturing the same A ball-and-roller bearing is disclosed having an inner ring, an outer ring arranged on the axis of the inner ring and rotating around the co-axis relative to the inner ring, and a rolling body interposed between the inner ring and the outer ring and rolli... | 06/19/2001 |
| 6235128 | Carbon and alloy steels thermochemical treatments The present invention is a unique sequential process for treating carbon and alloy steels to improve resistance to tribological stresses while reducing conventional processing time required to obtain articles having a similar hardness. This process compri... | 05/22/2001 |
| 6129988 | Gaseous modification of MCrAlY coatings The present invention generally describes methods for modifying MCrAlY coatings by using gaseous carburization, gaseous nitriding or gaseous carbonitriding. The modified MCrAlY coatings are useful in thermal barrier coating systems, which may be used in g... | 10/10/2000 |
| 6090225 | Process for manufacturing a carburized or carbonitrided steel component, and steel for the manufacture of this component Process for manufacturing a mechanical component made of steel, in which a blank of the steel component is manufactured and a high-temperature carburizing or carbonitriding treatment of at least part of the surface of the blank of the component is carried... | 07/18/2000 |
| 5916383 | Method of shot peening a hardened metal product with shot having high hardness A method for shot peening a hard metal product that has a hardened surface. The method includes projecting shot on the hardened surface of the hard metal product. The ratio of the Vickers hardness of the shot to that of the hardened surface is 0.8-1.6, an... | 06/29/1999 |
| 5912399 | Chemical synthesis of refractory metal based composite powders A new tungsten compound is formed by reacting ammonium metatungstate with guanidine carbonate. Such a compound can be converted to metallic tungsten, tungsten carbide or oxycarbide, and tungsten nitride or oxynitride. One can also make multiphase composit... | 06/15/1999 |
| 5900126 | Method for manufacturing austenitic stainless steel substrate for magnetic-recording media An improved magnetic-recording disk and a process for manufacturing magnetic-recording disks are disclosed. A precision cold-rolled authentic stainless steel is the substrate for a magnetic-recording disk. The surface of the substrate may be hardened by p... | 05/04/1999 |
| 5810947 | Method of surface modification for tool steels The adhesive strength and hardness of chromium nitride(CrN) film deposited on SKD 61 tool steel was significantly enhanced by a nitriding process on the surface the tool steel before coating with a CrN film. These nitriding processes included nitrocarburi... | 09/22/1998 |
| 5785774 | Process for producing heat treatment atmospheres An endogenerator is provided in which CO and H2 are generated as primary products of hydrocarbon oxidation. Noble metal catalysts such as platinum (Pt) and particularly rhodium (Rh), are loaded on a porous ceramic support, of example, an alumin... | 07/28/1998 |
| 5735375 | Nitrocarburized component for an electromagnetic friction clutch assembly An electromagnetically actuated friction clutch includes a rotatably driven input gear. A rotatable armature is connected to the input gear and includes a friction face and nitrocarburized outer surfaces. A pole piece has a pole face for engaging the fric... | 04/07/1998 |
| 5735971 | Method for the Pre-treatment of steel parts prior to salt bath nitriding Flawless nitrating layers are obtained during the nitro-carburizing of components made from steels which form passive layers in salt baths if these components are first pre-treated in an oxidizing salt melt at 300° to 500° C. prior to the nitro-carburiz... | 04/07/1998 |
| 5714015 | Ferritic nitrocarburization process for steel balls A nitrocarburization treatment for steel components, such as steel balls or ball bearings is disclosed. In the process, the balls are treated in a nitrocarburizing environment and then reoriented, either inside or outside of that environment to form an ep... | 02/03/1998 |
| 5707460 | Method of producing parts having improved wear, fatigue and corrosion resistance from medium alloy, low carbon steel and parts obtained therefrom Improved corrosion, wear and fatigue resistance is provided for pieces formed of medium alloy, low carbon steel by subjecting the piece to a treatment process which includes a step of carburizing, followed by nitriding. The process is especially useful fo... | 01/13/1998 |
| 5702540 | Vacuum carburizing method and device, and carburized products In order to keep down soot production and to enable every part of the workpiece, including deep concavities to be uniformly carburized by vacuum carburizing, and to enable decreases in the quantities of gas and heat employed, carburizing treatment is perf... | 12/30/1997 |
| 5669988 | Corrugating roll and manufacturing method thereof Object: Prevention of generation of press marks as well as increase of wear resistance at a corrugation tip portion and thereby providing a corrugating roll having a much improved life. Construction: A manufacturing method of a corrugating roll useful for ... | 09/23/1997 |
