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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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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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6612154 |
Systems and methods for monitoring a heat treating atmosphere derive from at least one sensor placed in situ in the atmosphere a process variable, which is indicative of the ratio of gaseous hydrogen H 2 (g) to water vapor H 2 O(g) in th...
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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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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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6051080 |
The invention relates to a power roller used for a toroidal-type continuously variable transmission. This power roller has on its first side a groove for receiving a bearing, and the surface of the groove (bearing surface) has a carbon c...
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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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6017641 |
A coil spring made of an oil-tempered steel wire with internal hardness of more than Hv 550 in cross-section, the surface hardness of the oil-tempered steel wire being determined in an extent between Hv 420 in a minimum value and hardnes...
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5231645 |
In the continuous carburization furnace in which the temperature of the heaters can be controlled individually at every carburization processing position; carburization reference data at each carburization processing position is read; a ...
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4881982 |
A method for gaseous carburization of steel, where, in a carbon-rich gaseous atmosphere, an article that is to be carburized is, in a first carburization phase, exposed to a carbon charge that is as great as possible, at the black limit,...
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4717429 |
Undesired nitrites are formed during the treatment of salt bath nitrided structural components of iron and steel in nitrate containing cooling baths, and they must be removed from the washing water. The build-up of nitrites can be avoide...
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4653314 |
An annular bead or other protuberance is provided on the outside of a bearing or other part on a non-critical surface so that the protuberance can be case hardened in the same manner as critical surfaces of the part and provide a degree ...
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4394234 |
A glow discharge surface treatment process wherein only the selected portions of a workpiece adjacent to or surrounded by the associated secondary electrodes are surface-treated so as to provide different treatments on the workpiece acco...
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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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4232852 |
An apparatus for the control of the carburizing of parts under vacuum in a acuum furnace, with which as a carbon carrier a hydrocarbon gas is introduced controlled in the furnace. A detector detects the occurrence of a soot mist formatio...
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4224057 |
Sponge iron is carburized in the cooling zone of a vertical shaft iron ore reduction reactor by causing a carbon-containing gas to circulate in a closed loop including the cooling zone of the reactor and an external conduit containing a ...
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4042427 |
A process for controlling the nitriding effect of a nitriding bath of a salt melt containing alkali cyanate for the nitridation of iron and iron alloys wherein the nitriding effect of the bath is maintained in a specific range by determi...
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3753799 |
A method of heat treating a high-chromium alloy steel part comprises maintaining the part in a fused salt mixture of cyanides and cyanates of potassium and sodium and controlling the mixture so as to maintain a desired ratio of sodium an...
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2914434 |
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2815305 |
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2753283 |
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2399005 |
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1923145 |
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