Large box furnaces offering the flexibility of heat treating and rapid cooling under protective atmosphere in an alloy muffle with a maximum operating temperature of 2050°F. The muffle is mounted on a portable cart assembly which can be transferred in and out of the furnace chamber. A manual vertical lift door mounted on the furnace seals the chamber when the muffle is removed. The holding door maintains the chamber temperature, saves energy and enhances furnace production capability for fast turnaround of the next muffle. The muffle separates the furnace insulation and heating elements from the workload and atmosphere to minimize scale and oxidation on most tool steels. This design achieves lower dew points in the work chamber, reduces atmosphere consumption and shortens purge time. A cladded plug type door with gasket seals against the muffle.

All models are completely wired, test fired and shipped ready for connection to main power and regulated atmosphere pressure of 5 PSI. All models will operate with inert atmosphere. Flammable atmosphere may be used with the addition of Atmosphere Safety System per NFPA Code 86 C. 

Standard Features   

• Welded angle iron frame construction with sheet steel and plate lining.
• Heavy gauge coil wound low watt density heating elements for longer life.
• High grade alloy corrugated muffle super hearth, inlet pipe and front flange.
• Multi-layered energy efficient lightweight firebrick and mineral block insulation for maximum heat storage and minimum heat loss.
• Elements mounted in easy-to-replace holders located on side walls and below the hearth for uniform temperature.
• Silicon carbide hearth plate for full muffle support and thermal transfer from floor element.
• Plug door with high temperature ceramic fiber gasket, swing bolts and handles for sealing against muffle flange.
• Workload capacity up to 35 lbs. per square foot of hearth area.
• Honeywell digital temperature controller with type K thermocouple and contactor.
• Controls are mounted in separate side mounted NEMA 1 panel and operate on 115 volts.

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