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7419553 |
A fuel injection valve for internal combustion engines, having a valve body and at least one injection opening embodied in it, through which opening, controlled by a valve needle that cooperates with a valve seat embodied in the valve bo...
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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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7118634 |
The invention relates to a low-pressure carburising method comprising alternating low-pressure enrichment steps and diffusion steps in the presence of a neutral gas. During the enrichment steps, an enriching gas and neutral gas mixture i...
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7033446 |
Vacuum carburizing of ferrous workpieces is performed at low pressure in a vacuum furnace using an unsaturated aromatic such as benzene as the carburizing medium. The unsaturated aromatic is gas phase hydrogenated into a napthenes, such ...
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6991687 |
Vacuum carburizing of ferrous workpieces is performed at low pressure in a vacuum furnace using a napthene hydrocarbon as the carburizing medium. The furnace is constructed to be generally transparent to the napthene so that cracking ten...
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6517642 |
A thin film of metal or metal compound is produced by preparing an ultrafine particle dispersion liquid by dispersing ultrafine particles at least partly made of metal into a given organic solvent, applying the ultrafine particle dispers...
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6458217 |
Systems useful for superadiabatic combustion generation of a reducing atmosphere for metal heat treatment include a superadiabatic reactor which supplies a reducing atmosphere to a metal heat treatment apparatus. In one aspect, the react...
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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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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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6106636 |
In a method of and apparatus for controlling an atmosphere in a heat treatment furnace according to the present invention, a carburizing is carried out while supplying a hydrocarbon series gas and an oxidization gas into the furnace. The...
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6051078 |
In a method of and apparatus for controlling an atmosphere in a heat treatment furnace according to the present invention, a carburizing is carried out while supplying a hydrocarbon series gas and an oxidization gas into the furnace, and...
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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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5795406 |
In a cementation method of metals in which hydrocarbon gas and oxidization gas are introduced into a heat treatment furnace, a small quantity of hydrocarbon gas of is introduced at a low pressure into the heat treatment furnace. The shif...
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5741371 |
A method for controlling the CO contents of furnace atmosphere for carburizing and carbonitriding metallic workpieces in a furnace includes the step of directly feeding a mixture of an oxidizing reagent and a hydrocarbon-containing fuel ...
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5702540 |
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...
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5676769 |
A treating material W pre-heated to a carburizing temperature of 750°-950° C. is heat-treated in a carburizing atmosphere directly supplied with hydrocarbon and oxidizing gases and heated to 1000°-1100° C. Then, the treating material...
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5591274 |
An exhaust gas of hydrocarbon is converted to an exothermic generated gas when it is burnt with air in a burner. The exothermic generated gas which has been dehydrated, is employed as a furnace atmosphere for decarburization or carburizi...
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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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5383980 |
Workpieces of steel are hardened by carburizing the surface and then quenching. The carburizing is performed by means of a plasma discharge in a vacuum, in the presence of gaseous hydrocarbons at voltages between 200 and 2000 volts, pref...
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5364476 |
A variable gas generator is disclosed which is capable of producing a wide variety of product gas compositions heretofore produced only by either exothermic gas generators or endothermic gas generators or a combination of gas generators....
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5306354 |
A blackening treating furnace includes a soot generation burner for blowing an incomplete combustion flame toward a surface of a cold-rolled stainless steel strip moving continuously through the furnace. A pair of secondary air nozzles i...
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5194096 |
Steel is carburized at a temperature within the austenitic range and in an atmosphere which comprises nitrogen, hydrogen and carbon monoxide, by lowering the hydrogen concentration in the treatment atmosphere prior to cooling steel in oi...
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5139584 |
A process and an installation for heat treatment or thermochemical treatment of steel permit instantaneous and permanent checking of the concentration of carbon at the surface of the steel, particularly in the course of the carbon enrich...
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5133813 |
A gas-carburizing process wherein an article is treated by feeding a hydrocarbon gas and an oxidative gas of raw material gases directly into an atmospheric heat treating furnace, characterized in that, when the pressure within the furna...
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5049185 |
The disclosure relates to a method for supplying, with a lance (11), a liquid to a heat treatment oven, the liquid being vaporized by the oven heat and being introduced into the oven with the aid of a carrier gas, and a lance (11) for ca...
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4950334 |
In a gas carburizing method, a hydrocarbon gas and air are supplied to a furnace main body that carburizes a workpiece. The hydrocarbon gas and air react with one another in the furnace main body to generate an atmospheric gas having a c...
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4744839 |
The process comprises opening the door of the furnace, introducing a charge into the furnace which was previously conditioned at the carburization temperature, closing the door of the furnace, subjecting the charge to a first phase, term...
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4597807 |
A method for operating a continuous rotary carburizing furnace is disclosed, wherein a carburizing mixture is introduced into the furnace retort without inerts while an inert gas is introduced into the shell of the furnace without carbon...
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4519853 |
The method of carburizing steel workpieces comprises loading workpieces to be carburized in a furnace and maintaining them in a carbon enriching atmosphere comprising carbon monoxide, hydrogen and nitrogen. The treatment comprises a firs...
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4472209 |
A method of carburizing a metal workpiece and a carburizing apparatus in which the workpiece, generally of steel, is introduced into an annealing oven and subjected to a high temperature in the presence of a carbon-containing gas mixture...
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4386972 |
Method of generating furnace atmospheres and processes for using the atmospheres for carburizing, decarburizing, neutral hardening, annealing or carbonitriding ferrous base metals. The invention is characterized by forming atmospheres th...
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4306919 |
In a process for carburizing steel parts, wherein it is desired to shut down the carburizing process for a predetermined period of time without removing the parts, the improvement comprising the following steps: (a) introducing parts,...
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4306918 |
A process for carburizing steel in a furnace under an atmosphere derived from the decomposition of an oxygenated hydrocarbon containing up to three carbon atoms, no more than one carbon to carbon bond, and a carbon to oxygen ratio of fro...
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4236941 |
An endothermic-base type heat treating furnace atmosphere is produced in an external generator by a partial oxidation between air and alcohol (e.g. ethanol). An alcohol-rich mixture is prepared and reacted at an elevated temperature to f...
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4152177 |
Gas carburizing is carried out in a subsantially closed furnace in an atmosphere initially containing hydrogen with just enough methane (or other suitable hydrocarbon gas) to provide sufficient carbon for carburization at a temperature a...
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4145232 |
In a process for carburizing steel in a furnace, using a defined carburizing atmosphere and regulating in defined manner the hydrocarbon component according to the amount of carbon dioxide present; maintaining a high flow rate when the p...
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4049473 |
The present invention relates to a method of carburizing and carbonitriding steel parts in the work chamber of a vestibule furnace with a substantially reduced consumption of carbon sources by exposing such parts to a gaseous carbon sour...
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4049472 |
Atmosphere compositions and processes utilizing the compositions for heat treating ferrous metal articles under a controlled furnace atmosphere to either maintain or change the surface chemistry of the article being treated are disclosed...
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3982970 |
The workability of a Group VIA metal, such as molybdenum, or an alloy of a Group VIA metal is improved by heat treating the Group VIA metal or alloy of the Group VIA metal in an environment for causing particles to be formed in the Group...
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3980506 |
A process for manufacturing highly wear-resistant, undistorted, axially symmetrical parts formed of a hardenable metal wherein the parts are subjected, in succession and while being rotated, to a surface pressure polishing process and to...
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3663315 |
The formation of soot is avoided during gas carburization or carbonitriding of steel having a carbon content of from 0.10 - 0.40 percent in an atmosphere of nitrogen and a hydrocarbon gas, such as natrual gas by the use of a barium, calc...
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3620518 |
Protective and carrier gases which are to be used in various processes in annealing furnaces are produced in situ with the aid of catalysts applied to the inner surfaces of the furnaces. Preferably the oxygen containing gas is preheated ...
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3519257 |
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3413161 |
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3356541 |
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3078192 |
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2948644 |
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2763582 |
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2673821 |
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