Retort furnaces

The inert gas retort furnaces with electric resistance heating are suitable for heat treating of various materials, if the heat treatment temperature is below 1000 °C. It is recommended for cementation, nitrocementation, nitriding, carbonitriding but can be used for hardening steels for quenching in inert gas and for any other heat treatment where the composition of atmosphere defines the efficiency of the heat treatment. The working space of the furnace is located inside the air-baffle cover in the retort. The retort lid with a water-cooled seal is gas tight. Inside the retort, the atmosphere is circulated by a fan placed on the lid to ensure a uniform composition of atmosphere and good temperature distribution (± 5 ° C). The shaft of the fan has a water-cooled seal at the point where it emerges from the lid. The applied neutral or active inert gas can be let in and out through the lid. The inflow of gas is measured by rotameters, the flow of gas can be adjusted manually or by motor using the throttle valves of the rotameters. The exhaust reaction gas is led to a burner where a continuously burning pilot light ensures that the combustible elements of the gas are burned off. The furnace operates intermittently. The insert may be placed into a cold or warm retort depending on the applied process. After inserting, the furnace must be flushed out with a neutral gas (N2). The insert can be heated under a neutral or inert gas.