Air Circulation Bogie Hearth Furnaces Electrically Heated or Gas-Fired
 Air circulation bogie hearth furnace W 5290/85 AS with annealing box for heat treatment of coils under protective gas Directly gas-fired bogie hearth furnace WB 4500/85A

W 10430/85AS


Cooling fan for accelerated cooling


Charge support in an air circulation bogie hearth furnace for 850 °C


Air circulation bogie hearth furnace for heat-treating coils


W 13920/60AS4 with bottom grid for heavy loads

The air circulation bogie hearth furnaces W 1000/60A - W 8300/85A are used when heavy charges weighing up to more than 25 t have to be heat-treated. They are ideal for processes such as solution annealing, artificial ageing, annealing or soft annealing, for which a high degree of temperature uniformity is crucial. The high-performance air circulation assures that the temperature uniformity achieved throughout the work space is outstanding. A broad selection of additional equipment enables these furnaces to be optimally adapted to suit specific processes.

  • Tmax 600  °C or 850  °C
  • Dual shell housing with rear ventilation provides for low shell temperatures for the 850  °C models
  • Swing door hinged on the right side
  • Heating from chrome steel heating elements for the 600  °C models
  • Heating from three sides (both side walls and the trolley) for the 850  °C models
  • High-performance air circulation fan with vertical circulation
  • Temperature uniformity up to +/- 5 °C according to DIN 17052-1
  • Bottom heating protected by SiC tiles on the bogie providing level stacking surface for the 850  °C models
  • Furnace chamber fitted with inner sheets made of stainless steel 1.4301 for 600  °C models and of 1.4828 for 850  °C models
  • Insulation structured with high-quality mineral wool for 600  °C models
  • Insulation made of high-quality, non-classified fiber material for 850  °C models
  • Bogies with flanged wheels running on rails for easy and precise movement of heavy loads
  • Electric chain-driven bogie in combination with rail operation for smooth movement of heavy loads from model W 4800
  • Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Direct gas heating or upon request with indirect gas heating with radiation tube
  • Electric chain-driven bogie in combination with rail operation for smooth movement of heavy loads up to Model W 4000
  • Optimization of the temperature uniformity up +/- 3 °C according to DIN 17052-1
  • Bogie running on steel wheels with gear rack drive, no rails in front of the furnace necessary
  • Different possibilities for an extension to a bogie hearth furnace plant:
    • Additional bogies
    • Bogie transfer system with parking rails to exchange bogies running on rails or to connect multiples furnaces
    • Motor-driven bogies and cross-traversal system
    • Fully automatic control of the bogie exchange
  • Electro-hydraulic lift door
  • Motor-driven exhaust air flaps, adjustable via the program
  • Uncontrolled or controlled cooling system with frequency-controlled cooling fan and motor-driven exhaust air flap
  • Multi-zone control adapted to the particular furnace model provides for optimum temperature uniformity in the 850  °C models
  • Commissioning of the furnace with test firing and temperature uniformity measurement (also with load) for the purpose of process optimization
  • Designed for Tmax 950  °C, fan blade driven indirectly via a belt to protect the air recirculation motor against over-heating
  • Process control and documentation with Controltherm MV software package, NTLog and NTGraph or Nabertherm Control Center (NCC) for monitoring, documentation and control
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmHeating powerElectrical
 °Cwdhin lWDH in kW1connection*
W 1000/.. A 8001600800100018002390230545.03-phase
W 1600/.. A 100016001000160020002390253545.03-phase
W 2200/.. A 100022501000220020003040253590.03-phase
W 3300/.. A600120022501200330022003040274590.03-phase
W 4000/.. Aor1500225012004000250030402780110.03-phase
W 4800/.. A8501200330012004800220040902780110.03-phase
W 6000/.. A 1500330012006000250040902900140.03-phase
W 6600/.. A 1200460012006600220053902770140.03-phase
W 7500/.. A 1400385014007500240046402980140.03-phase
W 8300/.. A 1500460012008300250053902780185.03-phase
1Depending on furnace design connected load might be higher *Please see page 76 for more information about supply voltage