Four, fours industrielles pour l'éboration de métal

Koyo Thermo Systems est représentée en Europe par
Crystec Technology Trading GmbH

Industrial furnaces

There are various industrial furnaces for the thermal treatment of steel, for hardening, bright carburizing, quenching, annealing, tempering, for brazing, for debindering and sintering of ceramics. Koyo offers also gas generators for endothermic and exothermic gas, ammonia crackers and part washing machines. In many cases, Koyo's own Moldatherm® heating elements are used.

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Steel Surface Hardening Furnaces, Bright 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.

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.

Continous carburizing furnace

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.
rotary drum type

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.
Pit Type Loading Furnace

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.
KCF Carbonitriding Furnace

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.

Non-Flame KCF Carbonirtiding Furnace

Mesh Belt Type Bright 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 bright carburizing small parts.

Mesh Belt Type

Nitriding Furnace
This furnace alows reduction of necessary man-power and shortening of total process time.
Nitriding Furnace

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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 for bulk hardening of steel.

Box Type Tempering Furnace
A tempering furnace at the later stage of the carburizing and hardening process ensures uniform temperature distribution by hot air circulation in the furnace. This is achieved by means of a large capacity fan and soaking plates.
Two series are available for high temperature applications and low temperature applications.

Box Type Tempering Furnace

Steam Tempering Furnace
This steam temper furnace is most suitable for oxide sealing process and homo treatment. Moldatherm® heater and the alloy muffle realize excellent temperature control and improve energy efficiency.
Steam Tempering Furnace

Continuous Annealing Furnace/Normalizing Furnace
With this type of furnace, continuous heat treatment of any kind of material is possible. The vacuum-purge type tray-pusher bright annealing furnace has been well-received for its value-added production.
Continuous Annealing/Normalizing Furnace

Strand Conveyor Furnace
This furnace is used for annealing wires of various materials such as stainless steel and Nichrome. Compared with conventional brick furnaces, running cost is greatly reduced and cooling/heating time is shortened.
Strand Conveyor Furnace

Aluminum-Light Alloy Treating Furnace
This is a continuous furnace suited for production of light alloy products such as engine parts and cast aluminum wheels. The solution heat treating process is ensured by good temperature distribution achieved through hot air circulation and a fast-feeding roller hearth mechanism to transfer the work load to the quench chamber.
Aluminum-Light Alloy Treating Furnace

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Vacuum Furnaces

Koyo offers a set of vacuum furnaces for applications like annealing, steel hardering or sintering. The vacuum protects the surface against corrosion by air.

Vacuum Hardening Furnace
Wide lineup of oil quenching and gas cooling systems (reduced pressure, atmosphere and pressurizing). Fully automated operation and production management. Labor-saving, high precision hardening.
  • Positive transfer with newly developed fork type method.
  • Improvement of temperature distribution by current adjusting SCR controls.
  • Low distortion processing by means of uniform cooling methods, such as shifting the upper/lower cooling and entire circumference cooling system.

Vacuum Hardening Furnace

Low Temperature Vacuum Furnace
Temperature distribution is greatly improved by the use of an agitator fan and current plates. The furnaces in this series are suited for low temperature processing including bright tempering as well as aging processing.
Low Temperature Vacuum Furnace

Vacuum Sintering Furnace
Adoption of carbon inner muffle allows the degreasing and sintering processes to be accomplished continuously in clean environment, enabling low-cost production.
  • Max. 2300°C model now standardized
  • Max. service temperature 2300°C is under vacuum.
  • Radiation thermometer is  used for temperature of 1700°C and above.
  • Vacuum (Atmospheric, Pressurizing) 0.96 MPa

Vacuum Sintering Furnace

Vacuum Purge Furnace
This is a muffle furnace externally heated by Moldatherm®-heaters. Energy saving and ease of maintenance are realized with this type of furnace.
Vacuum Purge Furnace

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Brazing Furnaces

Mesh Belt Type Brazing Furnace
Moldatherm heater realizes energy saving of 15~20% and provides ease of access for maintenance. Each unit is standardized.
Mesh Belt Type Brazing Furnace

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Sintering Furnaces

Sintering furnaces have been built by Koyo in many versions. Many applications are used in the ceramic industry.

Mesh Belt Type Sintering Furnace
The special muffle is employed to reduce atmosphere gases and to shorten seasoning time. Molatherm heater facilities maintenance, and the burn-off furnace guarantees high quality of productions.
Mesh Belt Type Sintering Furnace

Continuous Hight Temperature Sintering Furnace
This is a high temperature sintering and firing furnace used for sintering precious metal parts and firing of UO2 pellets in the temperature range of 1200-1800°C. Select either a ceramic conveyor type, walking-beam type or tray-pusher type transfer mechanism.
Continuous Hight Temperature Sintering Furnace

Bottom Loading Type High Temperature Sintering Furnace
This furnace is used for a wide variety of application, such as metal sintering, ceramic sintering, and metalizing. N2 and H2 gases are introduced into the furnace.
Bottom Loading Type High Temperature Sintering Furnace

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Special, customized furnaces

Here you find some exapmples of new types of industrial furnaces with many improvements, including energy saving, reduced running costs, etc.

Car Bottom Furnace
Dual heating with both electricity and gas is possible. This type of furnace is best suited for heat treatment of both large and heavy objects.
Car Bottom Furnace

Elevator Type
With this type of furnace, heat loss is reduced due to improvement of sealing performance,and the atmosphere is stabilized. Space requirements of this model are less than that of comparable furnaces.
Elevator Type

Pot Type Top Loading Furnace
This is best suited for annealing and normalizing of wire, particularly copper wires. A vacuum-purge type is also available.
Pot Type Top Loading Furnace

Bell Type Furnace
This type of furnace is widely used for the annealing of wires and aircraft parts. The weight of the heating cover has been reduced, and working efficiency and safety have been remarkably improved by the use of Moldatherm.
Bell Type Furnace

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Gas Generators

Koyo can offer three types of gas generators: Generators of endothermic gas and exothermic gas as well as ammonia cracker for the generation of hydrogen and forming gas.

Endothermic Gas Generator
The Koyo endothermic gas generator produces endothermic gas, consisting of hydrogen, carbon monoxide and nitrogen and with smaller amounts of carbon dioxide, water vapor, and methane, produced from fuel gas (primarily methane) and air. It can be used for carburizing, hardening, sintering, brazing.  The use of Moldatherm® heaters saves energy and simplifies maintenance. And these generators are also made more compact.
Endothermic Gas Generator

Exothermic Gas Generator
The Koyo exothermic gas generator produces exothermic gas consisting of hydrogen, carbon monoxide, carbon dioxide, water and nitrogen, from fuel gas and air under controlled conditions. It can be used for annealing, brazing, oxide reduction.
Exothermic Gas Generator

Ammonia Cracking Gas Generator

The Koyo Thermo Systems ammonia cracker, NH3-Cracker or hydrogen generator is used for the production of forming gas. Hydrogen and Nitrogen are generated in a cost effective way in a volume ratio of 3 : 1 or in a weight ratio of 14 : 3. Capacities from 5m3/h to 60m3/h are available.

The NH3 is coming from bottles or from an ammonia tank. The ammonia gas is pre-heated in a heat exchanger and vaporizer and then cracked in the main furnace unit. The furnace is electrically heated by special LGO heating elements.


Forming gas generator

Koyo Thermo Systems and Crystec will be pleased to engineer a cost effective system to satisfy your most demanding and exacting requirements.