Heat treatment unit

The heat treatment unit has a wagon gas furnace with a capacity of 2 tons. It performs various heat treatments such as hardening, annealing, normalization and stressing based on the customer’s need.

Hardening

Heat treatment involves heating to a temperature above the critical range (AC3) and maintaining it at this temperature to achieve a homogeneous structure, then re-cooling in water, oil or air environments, so as to prevent the austenite/perlite phase transformation and the underlying structure becomes martensitic.

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Annealing

Heat treatment involves keeping the material at an appropriate temperature to soften (reduce hardness) and homogenization the structure and release the remaining stresses. The phenomena of recrystallization and growth of stress-free coaxial crystals are some of the side effects of the annealing operation.

Normalization

This operation involves heating material to a stable austenite phase temperature, and then cooling it in the open air. The aim is obtaining a structure with small and coaxial grains and appropriate mechanical and machining properties.

De-tensioning

This is done after casting in order to minimize the residual stresses. This operation reduces the risk of warping, failure and dimensional changes during the service or subsequent operations.