JSC "NAKAL-Industrial Furnaces"

These furnaces are used to heat parts of alloyed steels for quenching, fire long workpieces and for other kinds of heat treatment requiring temperatures up to 1 200°C

Chamber furnaces are the most universal for such heat-treatment processes as quenching and forging. Due to the wide range of products, furnaces with various diameter working chambers are used both in machine tool production and at the heat-treating departments for basic products of our customers. More than 2 000 furnaces of this type are operated at present and the corresponding reference list includes more than 1 500 customers.

Technological processes related to tempering and stress relief after welding require high-precision temperature control and uniform temperature distribution in the working chamber. For the processes involving heat treatment of large-sized heavy charges we offer the NKO chamber furnaces.

Design features:

• Max temperature up to 700°C.
• Forced atmosphere circulation system (fans, screens, diffusers).
• Three-side heating: air passes at a high speed from sidewalls heaters located behind the screens and completes the circuit flowing through the charge which is heated by the hearth heaters from below.
• Uniformity within ±5°C.
• roof and door are lined with cost-saving Unifrax fiber insulation and walls have fiber or multilayer lining.
• Power consumption is 30-50% less as compared to brick linings.
• M and MDO embodiment furnaces are equipped with a motorized hearth allowing to charge up to 30 tons into the large-sized furnaces.
• Multizone temperature control system.
• Emergency shutdown at temperature rise over 750°C.
• Cast heat-resistant hearth plates and carborundum floor plates protecting the hearth against mechanical shocks.

Optional features: 

• Furnace accessories (baskets, shelves and stands)
• Forced charge cooling system.
• Removal system for products of combustion (oils, emulsions).
• Computer-aided data collection and storage system (documented technological parameters).
• Frequency-controlled hearth drive (acceleration – deceleration) for large charges (more than 7 tons).
• Motorized door lifting drive.