Industrial furnace for steel hardening, tempering, quenching, annealing, bright carburizing to harden
JTEKT Thermo Systems is represented in Europe by
Crystec Technology Trading GmbH
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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.
JTEKT Thermo Systems (previously Koyo Thermo Systems) offers also gas generators for endothermic and exothermic gas, ammonia crackers and part washing machines.
In many cases, JTEKT's own Moldatherm® heating elements are used.
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.
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| Rotary Drum Type continuous carburizing furnace |
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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 |
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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 |
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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 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.
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| Nitriding Furnace |
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This furnace alows reduction of necessary man-power and shortening of total process time.
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Annealing and Tempering Furnaces
For tempering and annealing of steel,
aluminium, copper or other materials, JTEKT 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.
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| Steam Tempering Furnace |
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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.
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| Continuous Annealing Furnace/Normalizing Furnace |
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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.
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| Strand Conveyor Furnace |
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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.
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| Aluminum-Light Alloy Treating Furnace |
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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.
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Vacuum Furnaces
JTEKT 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.
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| Low Temperature Vacuum Furnace |
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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.
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| 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
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| Vacuum Purge Furnace |
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This is a muffle furnace externally heated by Moldatherm®-heaters. Energy saving and ease of maintenance
are realized with this type of furnace.
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Brazing Furnaces
| Mesh Belt Type Brazing Furnace |
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Moldatherm heater realizes energy saving of 15~20% and provides ease of access for maintenance.
Each unit is standardized.
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Sintering Furnaces
Sintering furnaces have been built by JTEKT in many versions. Many applications are used in the
ceramic industry.
| Mesh Belt Type Sintering Furnace |
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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.
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| Continuous Hight Temperature Sintering Furnace |
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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.
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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 |
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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.
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| Elevator Type |
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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.
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| Pot Type Top Loading Furnace |
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This is best suited for annealing and normalizing of wire, particularly copper wires.
A vacuum-purge type is also available.
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| Bell Type Furnace |
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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.
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Gas Generators
JTEKT 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 |
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The JTEKT (previously 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.
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| Exothermic Gas Generator |
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The JTEKT 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.
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| Ammonia Cracking Gas Generator |
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The JTEKT 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.
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JTEKT Thermo Systems and Crystec will be pleased to engineer a cost
effective system to satisfy your most demanding and exacting requirements.
