Dual Chamber Metal Heat Treat Furnaces
Dual chamber heat treat furnaces for toolsteels (17-4 PH, D2, A2, A6, H13, S7, M2, AISI 4140) have two furnace chambers on top of each other. The upper chamber is used for hardening (red heat up to 2250°F) and the lower chamber for tempering/drawing/aging without waiting for the hardening chamber to cool down to the lower temperature required for tempering or drawing. The upper chamber door raises vertically for operator safety and the lower chamber has a convection fan for increased temperature uniformity. Optional 2000°F in the lower chamber available.
Options include inert gas atmosphere to reduce scaling, AMS 2750F instrumention type D or CQI-9 package for NADCAP certification, different temperature controllers and various other options, listed below.
A quench tank can be stored under the furnace and rolled out when needed. The wire wound heating elements are embedded into a ceramic plate which makes it easy to replace. Additional features such as inert protective atmosphere in each chamber to avoid scaling of your parts during heat treating are available; see Dual Chamber Bench Top Spec Sheet Other means to reduce scaling: parts wrapped in heat treat foil.
Controls: Both chambers are equipped with their own electronic control, thermocouples and solid state relays.
Available Options, get a quote: (please save PDF first to your PC, then open in Adobe Reader and fill it out)
- PID temperature controller Watlow PM4E (4 programs, 10 steps, timer)
- PID temperature controller Watlow F4 (40 programs, 256 steps, timer)
- Other PID controllers upon request
- High limit/over temperature protection (includes controller and thermocouple)
- Honeywell eZtrend Recorder for data collection and transfer
- Electrical other than standard 240 Volt, single phase, 60 Hz
- Audible Alarm
- Ceramic cement embedded element plate assemblies for heating element protection
- Spare parts package
- AMS 2750F package
Keith Company also builds custom electric or gas fired (direct or indirect fired) heat treat furnaces including drop bottom quench furnaces for heat treating non ferrous materials such as aluminum and magnesium.
The upper door (with the hardening chamber) rises vertically so the hot face is away from the operator when he opens the door, while the lower oven chamber door is a hinge type construction. For improved temperature uniformity during tempering and drawing, the lower furnace chamber can be equipped with a high temperature fan. Each furnace chamber has it's own independent temperature control, thermocouple and solid state relay for power switching.
Contact our multi-lingual (English, Spanish, German, French, Italian and Chinese) speaking specialists for any questions you might have.