For annealing and hardening of large parts, like heavy cast parts or tool steel dies to temperatures between 800 °C and 1200 °C, we recommend our bogie hearth furnaces with radiation heating. The bogie can be conveniently loaded outside the furnace. With a second door or bogie-transfer system, one bogie can be charged outside the furnace while the other bogie is in the furnace. This way, turnaround time between process cycles will be reduced substantially.

• Maximum temperatures of 900 °C or 1280 °C
• Double-walled housing with rear ventilation, provides low shell temperatures
• Swing door hinged on the right side
• Heating from five sides (four sides and bogie) provides for a uniform temperature distribution
• Automatic power connection to the bogie when moved into the furnace
• Heating elements mounted on support tubes provide for free radiation and long service life
• Floor heating protected by SiC tiles on the bogie providing level stacking surface
• Multi-layer insulation consisting of lightweight refractory bricks backed by microporus silica insulation
• Self-supporting roof arch
• Bogie on rails incl. rails in front of the furnace for charging
• Adjustable air inlet damper
• Manual vapor vent on the furnace roof

Additional Equipment

• Powerful direct gas heating
• Support grid made of heat-resistant cast steel for optimum weight distribution on the bogie for use up to 1100 °C
• Second door in rear wall for use of second bogie
• Lift-door instead of swing door including heat shield for opening while hot
• Heat shield „filler bogie” to prevent heat loss when the bogie is removed at high temperatures
• High-quality fibre insulation with corner bricks for shorter heating and cooling times
• Second bogie
• Electrical bogie drive
• Freely maneuverable bogie on Pevolon casters when using light charge weights
• Cooling fan for shorter process times
• Automatic control of exhaust air dampers
• Multiple zone control for optimum temperature uniformity according to DIN 17052-1 up to ΔT 10 K
• Alternative connected power
• Special sizes up to 20,000 liters
• Fixed hearth and movable furnace (envelope concept) for heavy charges up to 100 tons

Rotary hearth furnaces are used in the area of precision casting. They are used to preheat and sinter molds which have already been dewaxed in autoclaves. This type of furnace is always recommended when the working temperature is maintained continuously and the molds have to be discharged for pouring. A servo motor is installed under the furnace which moves the furnace table at defined time intervals. The movement takes place in predetermined segments which can be specified for each application.

• Tmax up to 1000 °C
• Designed for continuous operation at one temperature
• Diameter up to 3000 mm
• Servo motor under the furnace for movement in defined segments
• Smooth table movement
• Parallel swinging door for charging/discharging
• Table movement triggered by a foot pedal, timer or input from another system
• Very compact design in comparison with other continuous furnaces
• Electric heating using wire heating elements mounted in the furnace ceiling

Additional Equipment

• Multizone control for adjustable charge temperature profiles during passage
• Heating with powerful SiC heating rods for Tmax up to 1300 °C
• Fuel heating instead of electric heating
• Injection of protective gas for particular applications, such as the heat treatment of stainless steels

Salt-bath furnaces offer remarkably high temperature uniformity and excellent heat transfer to the work piece. Our salt-bath furnaces TS 20/15 - TS or TSB 70/90 are especially useful for heat-treating of metals in neutral or active salt baths. Processes such as carbonitriding (e.g. Tenifer) up to 600 °C, carburizing up to 950 °C, or bright annealing up to 1000 °C can be realized. In their standard version these furnaces are equipped with safety technology for heat treatment of steel. As addional feature they can be equipped with extended safety technology for heat treatment of light metals.

Standard Model

• Maximum temperatures of 750 °C or 1000 °C in the salt bath
• Safety technology according to EN 60519-2
• Useful for heat treatment of steel
• Bath temperature control
• Electric (TS) all-round heating or gas heating (TSB)
• Removable collar plate made of solid steel
• Insulated swing-a-way lid
• Optimum temperature uniformity according to DIN 17052-1 up to ΔT 4 K in the bath
• Over-temperature limit controller in the furnace chamber to prevent dangerous conditions for the furnace or personnel
• Bath control of salt bath and furnace chamber

Crucibles

• Type P: low carbon steel, CrNi plated and corundum coated for carburizing baths up to 950 °C, neutral salt and annealing baths up to 850 °C
• Type C: high alloy CrNi steel for neutral salt and annealing baths up to 1000 °C

Additional Equipment

• Exhaust gas collection at rim for connection to an exhaust system
• Custom dimensions
• Enhanced safety systems for heat treatment of aluminium and magnesium in the salt bath with second over-temperature limit controller and PLC-bath control with thermocouples in the salt bath and in the furnace chamber