Certain heat treatment processes require a gas-fired chamber furnace. Short heating times due to the high power are a convincing argument. The chamber furnaces with powerful atmospheric gas burners cover a wide variety of these processes. In the basic version the burners are manually ignited once at the start of the process. The automatic control system then takes over control of the temperature curve. At program end, the burners are automatically switched off. Depending on the process, the furnaces can be equipped with automatically controlled fan burners and safety technology for debinding. Depending on the model, these furnaces can be upgraded with fully automatic fan burners and additional accessories.

• Tmax 1300  °C
• Powerful, atmospheric burners for operation with liquified gas or natural gas
• Special positioning of the gas burners with flame guide top-down provides for optimum temperature uniformity
• Fully automatic temperature control
• Gas fittings with flame control and safety valve in accordance with DVGW (German Technical and Scientific Association for Gas and Water)
• Multi-layer, reduction-proof insulation with light-weight refractory bricks and special back-up insulation result in low gas consumption
• Self-supporting and rugged ceiling, bricks laid in arched construction or as fiber insulation
• Dual shell housing, side panels made of stainless steel (NB 300), for low outside temperatures
• Solid, double-walled door
• Exhaust hood with 150 mm (NB 300) and 200 mm (NB 440, NB 600) diameter connection
• Over-temperature limit controller with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load

Additional equipment

• Customized furnace dimensions
• Fan burner with fully automatic control
• Exhaust air and exhaust gas piping
• Thermal or catalytic exhaust cleaning systems
• Recuperator technology for heat recovery
• Process documentation and control with Controltherm MV software package for Nabertherm Control Center (NCC) for monitoring, documentation and control

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.

• Compact, robust 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 opening in the side of the furnace, or on back wall of furnace in the N 31/H models and higher
• Temperature uniformity up to ∆T 20 K according to DIN 17052-1
• Low energy consumption due to multi-layer insulation
• Gas spring dampers provide for easy door opening and closing
• Heat resistant zinc paint for protection of door and door frame (for N81 and larger)

These very rugged chamber furnaces with radiation heating are designed for continuous heat-treatment processes. They are ideally suited for forming processes such as forging or hot forming steel sheets. The use of a wide variety of accessories enables these furnaces to be tailored to the relevant application.

• Tmax. 1200  °C
• Very rugged design
• Heating from three sides (both sides and the floor)
• Heating elements installed on ceramic support tubes enable unimpaired heat radiation
• Floor heating protected by heat-conducting SiC plate
• Manual lift door for models to N 951
• Electro-hydraulic lift door for models from N 1296
• Heating operated with low-wear semi-conductor relay (for models to 60 kW)
• Temperature uniformity up to ∆T 20 K according to DIN 17052-1
• Closable measuring port for customer's temperature measuring system
• Holding time measurement for the charge until it goes to forging or forming of steel sheets: After charging, the operator presses a key and the previously defined holding time for the load begins to run. The end of the holding time is indicated by both acoustic and optical signals, meaning that the charge can be removed.
• Heat resistant zinc paint for protection of door and door frame

Additional equipment

• Other temperatures on request
• SiC plates to protect the wall heating elements
• Electro-hydraulic lift door for models to N 951
• 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 grates for heavy loads
• Cooling fan in combination with motor-driven exhaust air vents in the top of the furnace
• Heating elements also in door and rear wall for optimized temperature uniformity up to ∆T 10 K according to DIN 17052-1
• Commissioning of the furnace with test firing and temperature uniformity measurement using 11 thermocouples including record of the measurement results
• Furnace chamber with optional heating elements in the ceiling when used for preheating of sheetmetal plates
• Process control and documentation with Controltherm MV software package