Series HS3 GT - High Speed Steel Inert Atmosphere GT Box Furnaces
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HS3 Series Box furnaces for hardening and pre-heating high speed steels or firing ceramics under inert atmosphere to 2450°F. GT models are designed with a continuously welded furnace shell, gasketed door assembly, and atmosphere inlet and outlet ports for operation with a positive flow of atmosphere. These models are best suited for constant operation to maintain a dry refractory environment in the work area to minimize oxidation on workloads.
The control package includes an SCR power supply which proportions the lowest power input required for each application and limits the amperage, combined with a 200% aging factor providing excellent element life. This unique operating system saves money on initial purchase by eliminating the large expensive power transformer, oversized contactors, and the manual adjustment of tap switches. Designed with silicon carbide heating elements mounted above and below the hearth and ceramic fiber insulation for fast uniform heat. This energy efficient furnace promotes reduced power demand, quicker recovery rates, and lower utility costs.
All models are completely wired, assembled, test fired and shipped ready for connection to 230 voltage and atmosphere supply. Compact design, fast installation, and simple, safe, dependable operation. Available in five standard models sizes.
Standard Features
- Continuously welded sheet metal shell construction with structural reinforcement.
- Silicon carbide elements mounted above and below the hearth provide temperature uniformity of +/- 10°F.
- SCR power supply.
- Multi-layered 6" of energy efficient ceramic fiber and mineral wool block insulation for maximum heat storage, less heat loss and lower utility costs.
- Heat-up rates to 2200°F in 55 minutes.
- Silicon carbide hearth plates support the work load and readily transfer the heat from the floor elements.
- Double-Pivot horizontal swing door with gasket seals against furnace faceplate.
- Safety micro-switch shuts off power to elements when door opens.
- Honeywell digital temperature controller with type R thermocouple.
- Controls are mounted below furnace in an enclosed cabinet and operate on 115 volts.
