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” when the bogie is removed at high temperatures
• 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

These universal chamber furnaces with radiation heating have been specifically designed to withstand heavy-duty use in the heat treatment shop. They are particularly useful for processes such as tool making or for hardening jobs, e.g. annealing, hardening and forging. With help of various accessories, these furnaces can be customized to your application requirements.

Standard Model N 31/H - N 61/H

• Compact economical design
• Three-sides heating: from both side walls and floor
• High-quality, free-radiating heating elements mounted on support tubes for longest service life
• Floor heating protected by heat conducting SiC tiles
• Parallel guided downward swinging door (user protected from heat radiation)
• Stainless steel upper door jamb protects furnace structure when furnace is opened hot
• Exhaust port in rear
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 20 K
• Low energy consumption due to multi-layer insulation
• Gas spring dampers provide for easy door opening and closing

Standard Model N 81 - N 1491 (in Addition to Standard Models N 31 - N 61)

• Upward-swinging manual door with counterweight and gas damper
• Free radiating heating elements mounted on support tubes

Additional Equipment for N 31/H - N 1491

• SiC plates to protect the wall heating elements (N 81 and larger)
• Electro-hydraulic lift-door (N 81 and larger)
• Protective gas ports in combination with silicone sealing of the chamber
• Annealing boxes for powder nitriding, annealing and hardening under protective gas
• Loading devices and charging aids, charging plates
• All accessories for heat treatment processes see Heat Treatment II catalog
• Cooling fan and automatic control of exhaust vents (N 81 and larger.)
• Heating elements also in door and rear wall for optimized temperature uniformity according to DIN 17052-1 up to ΔT 10 K (N 81 and larger, reduced useful chamber depth)