Electrode salt baths are intended for heating for hardening of all types of high-speed steel, for heating the steel billets and annealing of specialized and carbon steel. They can be used at operating temperatures up to 1300 ° C.
Salt bath consists of welded steel casing in which are placed the heat insulation and the intermediate casing from refractory steel, built-in inside with special high aluminosilicate oxide refractory bricks. In the workspace of the refractory bath are mounted electrodes supported by water-cooling porters. The electrodes are insulated from the steel casing. The furnace is powered by a stepped three-phase dry transformer.
Cooling the installation of the porters of the electrodes is connected to main water supply through flexible rubber hoses.
The thermal insulation of the bath is filled by a new, modern and reliable manner. The refractory layer of the bath is formed by high aluminosilicate oxide solid bricks with low porosity. The bricks are sealed with suitable refractory concrete to the metal intermediate casing. Behind the crucible, the insulating layer of the bath is fulfilled by vacuum formed insulation panels and flexible mats and the floor of the bath is fulfilled from special light-weight refractory bricks. The materials are chemically inert and resistant to various gas environments.
The temperature in the heating chamber is regulated by a programmable microprocessor PID controller perceiving direct signal from a standard thermocouple.
Electrical switchboards are designed for power and control of the salt bath with operating voltage according to the design and the control of the thermal processes. The electrical switchboards provide appropriate control and protection of the circuits and automation, providing the required security.
The electrical resistance furnaces and respectively the switchboards for powering and management work with three-phase mains voltage (380 V) – to power the load chain and 250 V for control circuits (command and protective circuits related to the safety).
Available salt baths of this type are made in accordance with the technical assignment of the client and in accordance with the requirements of the technology for heat treatment of the products.