These pit-type retort furnaces are particularly suitable for annealing of heavy charges or charge baskets handled by crane which require heat treatment under protective gas in a defined atmosphere. Just like the models N 21/M etc., these furnaces can be evacuated at ambient temperatures to reduce gas consumption during pre-purging. Alternatively, furnaces S 500/RA and larger are available with interior retort gas circulation to further improve temperature uniformity.

S 100/R - S 1000/R

• Pit-type retort furnaces for heat treatment in a defined protective gas atmosphere
• Maximum temperatures of 1100 °C
• Gas tight alloy retort with protective gas inlet and outlet
• Port for temperature measurements in the chamber
• For all non-flammable protective gases including nitrogen, argon, or forming gas 95/5
• Water-cooled lid with ‚O‘ ring sealing
• Heating from four sides
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 14 K
• Pneumatic or hydraulic lid lifting

Additional Equipment for Standard Models S 500/RA - R 1000/RA

• Gas circulation with fan in the lid for optimum temperature uniformity according to DIN 17052-1 up to ΔT 6 K
• Water-cooled motor flange

Additional Equipment

• Manual or automatic gas supply panel
• Automatic exhaust damper and cooling fan for rapid cooling
• Control of retort temperature inside
• Vacuum pump for evacuating the retort at ambient temperature prior to heat treatment for reduced pre-purge times and gas consumption
• Cooling station, additional retort for increased productivity
• Custom sizes up to 3,000 liters and charge weights up to 5,000 kg
• Charging baskets and devices