| Industrial furnace, furnaces for metal working |
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Koyo Thermo Systems Co., Ltd. is represented in Europe
by
Crystec Technology Trading GmbH |
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Industrial Furnaces Steel tempering Ceramic
Furnaces Sintering Box-Ovens
Conveyor Cracker Exo
Endo Moldatherm |
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Industrial furnaces
Koyo produces various industrial furnaces for the thermal
treatment of steal, for brazing, for debindering and sintering of
ceramics, as well as gas generators for endothermic and exothermic
gas, ammonia crackers and part washing machines. In many cases,
Koyo's own Moldatherm® heating elements are used.
Steel Surface Hardening Furnaces, Carburizing Furnace,
Carbonitriding Furnace, Nitriding Furnace
For hardening of steel surfaces, several methods can be used.
Carburizing is a process of adding carbon to the surface of steel
with low carbon content. The carbon will diffuse into the steel and
form martensite after quenching.
In gas carburizing, commercially the most important variant of
carburizing, the source of carbon is a carbon-rich furnace
atmosphere containing CO, produced either from gaseous
hydrocarbons, for example, methane, propane, and butane, or from
vaporized hydrocarbon liquids.
Carbonitriding is a modified form of gas carburizing, rather than a
form of nitriding. The modification consists of introducing ammonia
into the furnace chamber to add nitrogen. Nascent nitrogen forms at
the work surface by the dissociation of ammonia; the nitrogen
diffuses into the steel simultaneously with carbon. Temperature is
lower compared to carburizing.
Nitriding is a version of surface hardening, integrating Nitrogen
in the iron lattice at low temperature, using ammonia as a process
gas. Quenching is not necessary in this case.
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Continuous carburizing furnace (Tray pusher type, roller hearth
type) The stable quality of the products is ensured, because a
cylindrical shell enables good temperature and atmosphere control,
and the furnace comes with a state-of-the-art configuration and
production management system. Gas quenching can be integrated in
this furnace as an option in order to achieve low quenching strain,
distortion and good hardness distribution. High Carbonmonoxide CO
containing atmosphere allows reduction of the carburizing process
time. |
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Rotary Drum Type continuous carburizing furnace This type of
equipment is most useful for a process involving small
parts-supplying, carburized hardening, washing, tempering and
removal are carried out continously in a completely integrated heat
treating system. |
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Pit Type Top Loading Furnace This is a muffle furnace using
Moldatherm® heating elements. The distinctive features of this type
of furnace are fast stabilization of atmosphere gas, excellent
heating/cooling characteristics, ease of maintenance, and energy
saving operations. |
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KCF Carbonitriding Furnace The KCF carbonitriding furnace is
designed for flexible products and energy-savings with a
construction that allows only minimal diffused heat, uniform
temperature control and stable internal pressure. |
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Non-Flame KCF Carbonitriding Furnace The conventional flame
appearance can be avoided by using a vacuum-purged oil bath that
improves safety and work environments where heat treatment is
used.
For both KCF and Non-flame KCF, a series of energy-saving furnaces
employing Moldatherm®-heaters which ensures quick temperature
control and atmosphere seasoning have been developed. Two units of
oil bath agitators are to be provided. Straight-through furnaces
also available. Cooling chamber and models for both carbonitriding
and soft nitriding are offered as options. Gas-firing KCF
cabonitriding furnaces also standardized. |
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Mesh Belt Type Continuous Carburizing Furnace A reliable
conveyance system has been made possible in a mesh belt driven
format by means of a hearth roller.
This type of in-line energy-saving muffle furnace using Moldatherm
is best suited for carburizing small parts. |
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Nitriding Furnace This furnace alows reduction of necessary
man-power and shortening of total process time. |
Annealing and Tempering Furnaces
For tempering and annealing of steel, aluminium, copper or other
materials, Koyo can offer batch ovens and continous furnaces, using
vacuum and different atmospheres or steam. Here you can see a few
examples.
When annealing is followed by a quenching process and by a second
annealing step, these furnaces can be used fo
