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7115174 |
In a known method for producing an oxide layer on metal parts, the metal parts are heat-treated in a treatment chamber during a carburization phase at temperatures below 1100° C. [2012° F.] in an atmosphere containing carbon monoxide a...
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6969430 |
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, H 2 , CO 2 , H 2 O, CH 4 and N 2 , such that the product of the % CO and %...
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6846366 |
There is provided an economical carburizing method and carburization apparatus capable of carrying out carburizing treatment with a quality as high as that in a normal case and a high reproducibility even if carburizing conditions differ...
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6635121 |
The invention relates to a method for controlling the decarburization of steel components in a furnace during heat treating processes. The concentration of CO 2 and/or CO in the furnace is monitored in a first batch in order to determin...
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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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6406560 |
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 wor...
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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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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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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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6074493 |
This invention aims at providing a method of continuously carburizing a metal strip, which is capable of providing industrially optimum carburization conditions while attaining non-soot-generating atmospheric data, desired carburization ...
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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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5958156 |
Apparatus (1) and process for treating particulate material or powder (33) of a size capable of being fluidized in a retort (31) mounted for rotation on a pair of end axles (18, 41). Retort (31) is mounted on a tilt frame (5) for tilting...
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5846341 |
The proposed method of carrying out diagnostics on a process for the thermo-chemical treatment of steels and alloys in a glow discharge involves monitoring the ionization characteristics of the atmosphere as revealed by the intensity of ...
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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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5749978 |
A method for the forming and feeding of a gaseous atmosphere having two components, at least one of which under the form of vapour obtained from liquid, envisages to bubble a first gaseous component within a liquid component kept under c...
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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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5599404 |
A substrate material to be coated with either a nitride, carbide, or oxide contains a small percent of a specific reactive element, like titanium, which forms very stable nitrides, carbides, or oxides. The material also contains larger p...
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5472520 |
A method for controlling oxygen deposition on steel sheets. The oxygen deposition value of a steel sheet measured after decarburization annealing remains at a constant value by controlling, in the decarburization annealing line for the s...
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5456766 |
Process for carbonitriding a steel comprising: 0.75-1.1% by weight of C; up to 1.0% by weight of Si; less than 0.015% by weight of P; up to 0.5% by weight of Mo; up to 1.2% by weight of Mn; 0.5-2% by weight of Cr, th...
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5417774 |
A process for producing low-cost atmospheres suitable for annealing, brazing, and sintering ferrous and non-ferrous metals and alloys, neutral hardening low, medium, and high carbon steels, sintering ceramic powders, and sealing glass to...
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5366563 |
The surfaces of a metal or alloy component are scrubbed by a high-velocity stream of inert gas at temperatures which facilitate removal of contaminants. Simultaneous with scrubbing, the impurities are captured in a separated loop of one ...
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5348592 |
An improved method for producing substantially moisture- and oxygen-free, nitrogen-hydrogen atmospheres suitable for annealing, hardening, brazing, and sintering ferrous and non-ferrous metals and alloys is disclosed. According to the di...
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5298090 |
A process for producing low-cost atmospheres suitable for annealing, brazing, and sintering non-ferrous metals and alloys from non-cryogenically produced nitrogen containing up to 5%, residual oxygen is disclosed. According to the proces...
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5284526 |
An integrated two-step process for producing low-cost atmospheres suitable for annealing ferrous and non-ferrous metals and alloys, brazing metals, sealing glass to metals, and sintering metal and ceramic powders in continuous furnaces f...
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5205873 |
A low pressure carburization process for metal alloy parts uses a fuel mixture consisting of hydrogen with 2 to 60% by volume ethylene. The fuel mixture is heated to a temperature between 820° and 1100° C. A furnace installation for ca...
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4992113 |
Process for the heat treatment of low-alloy steels at temperatures higher than 600° C., such as annealing or heating before hardening, etc., said treatment being carried out in a protection atmosphere produced by the injection of nitrog...
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4966348 |
A method and apparatus for operating a rotary retort heat treating furnace involves incorporating an outlet for withdrawing furnace atmosphere from the retort above the axis of rotation and conveying the withdrawn gas remotely form measu...
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4769090 |
Process in which there are injected a carrier gas and a hydrocarbon capable of producing, at conventional carburizing temperatures, an atmosphere of predetermined composition having a nominal concentration of carbon monoxide, a door of t...
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4655851 |
Disclosed herein are treatments for the manufacture of earth boring drill bits having abrasive wear resistant seal surfaces. The external surface of the bearing pin is surface treated, as by carburizing, in one region and simultaneously ...
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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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4445945 |
Disclosed is a method of controlling the atmosphere of a heat-treating furnace whose atmosphere consists essentially of a carrier gas of CO, H 2 and N 2 produced from a mixture of methanol and nitrogen. In accordance with the present i...
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4417927 |
Ammonia is used in the hardening of steels in a nitriding process which is controlled to limit or prevent formation of undesired iron nitrides by measuring the difference between input and output gas flow rates to and from the nitriding ...
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4372790 |
A method and device for control of the carbon level of a gas mixture reacting in a heat treatment furnace, which gas mixture arises by means of the introduction of a fuel containing hydrocarbon into the furnace chamber, the reaction prod...
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4322255 |
The present invention relates to improvements in processes for treatment of steel under a controlled atmosphere. Use is made of an atmosphere formed by a carrier gas comprising or containing industrially pure nitrogen and by an active ga...
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4317687 |
A process for carburizing ferrous metal articles in a furnace under an atmosphere derived from an input of nitrogen and ethanol injected into the furnace during the entire cycle. Carburization is controlled in a first embodiment by the c...
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4208224 |
In a process for carburizing ferrous parts, nitrogen gas is supplied to the vestibule of an integral quench furnace while a gaseous carbon source is supplied without a carrier gas to the furnace hot zone. H 2 O is introduced into the ho...
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4191598 |
A method and apparatus for recirculation of atmosphere in a vacuum furnace which comprises a recirculation loop in which there is a low pressure line from the furnace chamber leading to a recirculation pump which pumps the recycled gas a...
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4175986 |
Ferrous articles are heat treated by introducing a gaseous carbon source and an inert carrier gas into a heat treating furnace containing the ferrous articles. The heat treating process is controlled by determining the amount of carbon m...
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4168186 |
A method and apparatus for the control of the carburizing of parts under vacuum in a vacuum furnace, with which as a carbon carrier a hydrocarbon gas is introduced controlled in the furance. As the control quantity a soot mist formation ...
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4108693 |
The invention relates to a method of and an installation for the heat treatment of steels, such as heating before hardening, annealing, and carburization, which heat treatment is carried out in a furnace in the presence of a protection o...
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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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4035203 |
The invention relates to a method of and an installation for the heat treatment of steels, such as heating before hardening, annealing, carburization and carbo-nitridation, carried out in a furnace in the presence of a protection or carb...
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3201290 |
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3011873 |
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2886478 |
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2698222 |
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2279231 |
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1974541 |
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3843419 |
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