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7442261 |
In a method of producing an iron-based alloy containing chromium carbide, pieces of cemented carbide are added to an iron-based melt containing carbon, e.g. cast iron. Chromium, which regulates the solution of WC into the melt, is also a...
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7422643 |
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...
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7416614 |
A method of gas carburizing is carried out at a carburizing temperature which is not higher than a peritectic point temperature at which δ iron and liquid phase are transformed into γ iron and not less than a eutectic point temperature...
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7384488 |
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, 0.01...
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7270719 |
The invention relates to the use of PVD technique for the application of a low static friction and wear resistant coating consisting essentially of titanium nitride or a diamond-like carbon—DLC, with or without an addition of tungsten ...
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7208052 |
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 includ...
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7207933 |
A roller member comprising high carbon chromium bearing steel having a carburization treatment. The bearing steel comprising a surface portion defined as a range between a surface of a rolling face of the roller member to a depth where a...
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7122086 |
A rolling support device excellent in both of the characteristics of durability and corrosion resistance is provided. The inner ring ( 1 ) and the outer ring ( 2 ) comprises an austenitic stainless steel and has, on a raceway surface, a ...
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7029540 |
In a first process of a method of gas carburizing, a steel treatment object in a carburizing atmosphere containing carburizing gas is heated to an initial set temperature which is not higher than a peritectic point at which δ iron and a...
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6982120 |
The invention relates to components made of steel, more particularly outer joint parts and inner joint parts of constant velocity joints, and to a process of heat treating such components made of steel. The heat treatment operation inclu...
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6942739 |
The present invention is directed to a process for producing pearlite from an iron containing article comprising the steps of, (a) heating an iron containing article comprising at least 50 wt % iron for a time and at a temperature suffic...
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6869489 |
A steel for a high bearing pressure-resistant member, having a high machinability. The steel is formed of a machine structural steel comprising carbon in an amount ranging from 0.15 to 0.25% by weight, silicon in an amount of not less th...
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6858096 |
A rolling element for a continuously variable transmission, including a plurality of rolling members having rolling contact portions that come into rolling contact with each other via lubricating oil. At least one of the rolling contact ...
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6776854 |
In the partial thermochemical vacuum treatment of metallic workpieces ( 1 ), in particular in the carburization and case hardening of workpieces ( 1 ) of case-hardening steel in a carbon-containing atmosphere, surface regions ( 3, 4, 5, ...
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6695930 |
Steel alloys susceptible to case and core hardening comprise 0.05 to 0.24 wt % carbon; 15 to 28 wt % cobalt and 1.5 to 9.5 wt % in nickel, small percentages of one or more additives: chromium, molybdenum, and vanadium; and the balance ir...
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6552280 |
A precision weight (1) has greater permanence of mass due to a hardened surface layer that provides greater wear and scratch resistance as well as greater corrosion resistance. The hardened surface layer is a diffusion layer of increased...
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6547888 |
An iron-containing workpiece is case hardened by low temperature carburization during which one or more process steps—including adjusting the carburization temperature, adjusting the concentration of carburization specie in the carburi...
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6461448 |
A method for case hardening a chromium bearing nickel or ferrous based alloy, for example stainless steel, article, the method including the steps of activating the surface of the article; and carburizing the activated surface at a tempe...
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6458220 |
Steel alloys susceptible to case and core hardening comprise 0.05 to 0.24 weight percent carbon; 15 to 28 weight percent cobalt and 1.5 to 9.5 weight percent in nickel, small percentages of one or more additives: chromium, molybdenum, an...
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6328819 |
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 ...
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6306227 |
In a rolling bearing having a rolling bearing ring and a rolling element of at least 20 mm in diameter, at least one of the rolling bearing ring and the rolling element consists of carburized or carbonitrided steel containing at least 0....
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6287393 |
An improved process for producing an atmosphere suitable for carburizing steel components by adding a small amount of oxygen to a mixture of natural gas and carbon dioxide, pre-heating the mixture to the desired reaction temperature in t...
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6258179 |
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 ...
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6248186 |
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 ou...
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6238490 |
Austenitic stainless steel articles are treated to produce a hardened surface layer thereon by plasma heat-treating the articles at a temperature in the range of 300 to 600° C. and at a pressure in the range of 100 to 1500 Pa in a carbo...
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6187111 |
An improved vacuum carburizing method is provided which is easy to handle or to maintenance and low equipment costs without using hydrogen gas or acetylenic gas. The improved vacuum carburizing method comprises a carburizing treatment of...
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6179933 |
Rolling-element bearing components made from high quality steel are subjected to ion nitriding in a plasma as a final step in the manufacturing process to produce a layer with a hardness around 800-1200 HV with a depth no more than 150 Î...
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6159306 |
The present invention provides a new and improved apparatus and method of carburizing ferrous metal parts. In one embodiment of the invention the apparatus comprises a radiant heater tube within which a source of hydrocarbon fuel is full...
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6149734 |
A method for the heat treatment of steel, comprising carburization hardening said steel, to form carburized steel, followed by a second hardening, reduces the grain size of steel while precipitating carbonitrides inside the grains of ste...
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6146472 |
A steel composition and method of processing have been developed that provide good grain coarsening resistance and optimum toughness after austenitizing at high temperatures for extended periods of time. The composition comprises, in % b...
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6146471 |
The improved spherical plain bearing of the present invention is formed using a unique method of manufacture which includes surface hardening of the outer ring and the inner ring wherein the outer ring includes a fracture zone having a r...
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6110296 |
A substantially carbon free (e.g. 50-80 ppm carbon max.) iron base melt is strip cast to provide a cast strip having a low strength, high ductility, essentially ferrite matrix substantially free of hardening acicular ferrite, bainite and...
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6090225 |
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 co...
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6051203 |
Monolithic metal oxide structures, and processes for making such structures, are disclosed. The structures are obtained by heating a metal-containing structure having a plurality of surfaces in close proximity to one another in an oxidat...
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6022468 |
The method is provided for hardening carbon steel by using electrolysis and a pulsed direct current supply.
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5916383 |
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 surf...
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5853502 |
A carburizing steel having the following chemical composition: C: 0.1 to 0.25%, Si: 0.2 to 0.4%, Mn: 0.3 to 0.9%, P: 0.02% or less, S: 0.001 to 0.15%, Cr: 0.5 to 0.9%, Mo: 0.15 to 1%, Al: 0.01 to 0.1%, B: 0.000...
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5841033 |
A process for improving fatigue resistance of a case hardened component having a case thickness "t", subjected to one or more of rolling, sliding, abrasion, bending and pitting includes determining the magnitude of fatigue strength at su...
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5827375 |
The present invention provides a new and improved method of carburizing ferrous metal parts. In one embodiment the invention comprises the steps of heating the process chamber of a furnace to a temperature in excess of about 1100° F., c...
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5769965 |
A method for treating soft magnetic parts by annealing and producing a wear guard layer, in which the soft magnetic parts are either successively annealed and provided with a wear guard layer in a reaction chamber of a treatment apparatu...
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5729822 |
A powder metal gear wheel having a core density of at least 7.3 g/cc, and in one embodiment 7.4 to 7.6 g/cc and a hardened carburized surface. A method of manufacturing transmission gears comprises, sintering a powder metal blank to prod...
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5707460 |
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 es...
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5637158 |
A method of manufacturing an expansible anchor comprises the steps of forming one part as a partially slotted expansible sleeve composed of corrosion-resistant steel and anchorable in a building component, forming another part as an expa...
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5593510 |
A method of carburizing austenitic metal comprising the steps of holding austenitic metal in a fluoride-containing gas atmosphere with heating prior to carburizing and carburizing the austenitic metal at a temperature not more than 680°...
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5556483 |
A method for carburizing austenitic metal comprising fluorinating the austenitic metal and consecutive carburizing at a low temperature not more than 680° C. A carburizing temperature can be lowered by such a fluorination. As a result, ...
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5498299 |
The surface oxidation under carburization temperatures of steels during the carburization with carbon-containing gas mixtures is avoided by heating the steels to the carburization temperature under a nitrogen/hydrogen mixture or pure hyd...
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5431746 |
Methods for preparing magnetic strips are provided in which the strips are manufactured to a thickness of less than about 0.005 inches and are made of a ferrous alloy having a carbon content of from about 0.4 to about 1.2 weight percent....
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5383979 |
In a process for producing a workpiece from sintered metal, especially from sintered iron, the latter is subjected, after sintering, to a steam treatment at temperatures below 500° C., especially at 430°-480° C., at a steam partial pr...
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5344502 |
The surface hardening diffusion process for an austenitic material such as 300-series stainless steel uses a pack carburization process at a temperature range from about 1500° F. to about 2500° F. for a period of time ranging from abou...
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5324366 |
A heat treat furnace system 20 for heat treating metal workpieces includes a rotary carburizing chamber 24 containing a carburizing atmosphere, a cooling chamber 40A or 40B adjacent the carburizing chamber 24, a gas barrier device 50 coo...
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