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Isothermal Annealing Furnace

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An Isothermal Annealing Furnace is used to heat treat metals (especially steels and alloys) at a constant temperature � held isothermally � to refine grain structure, reduce hardness, and improve machinability or ductility.

Why Use Isothermal Annealing?

It allows for:

More uniform microstructure
Better control of mechanical properties
Shorter cycle times than full annealing
Reduced distortion and residual stress

How the Furnace Works

Load the metal workpieces into the furnace.
Heat rapidly to the austenitizing temperature (e.g., ~850-950^oC for steel).
Cool down quickly to the isothermal soak temperature (e.g., ~600-700^oC).
Hold at that temperature for a defined time (to complete transformation).
Cool slowly in the furnace or controlled environment.

Features

Precise temp control - Maintains tight isothermal ranges (±2-5^oC)
Rapid heating - Often with fast-acting burners or coils
Controlled cooling - With fans, baffles, or inert gas
Insulated chamber - Minimizes heat loss and improves stability
Programmable logic controller (PLC) - For temp curves and timing

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