What are the main types of annealing treatment?

2025-09-15 10:00:23

Annealing treatment can be categorised into several types based on purpose and process parameters:

- Full annealing (heating to the austenitising temperature followed by slow cooling to achieve complete recrystallisation of the microstructure)

- Partial annealing (heating below the austenitising temperature, resulting in partial recrystallisation of the microstructure)

- Isothermal annealing (holding at a constant temperature after heating to ensure more uniform microstructural transformation) spheroidising annealing (promoting carbide spheroidisation to reduce hardness and improve machinability), and recrystallisation annealing (primarily used for work-hardened materials to restore ductility). In cold-rolled coil production, recrystallisation annealing is commonly employed. This process involves heating to induce grain nucleation and growth in cold-deformed grains, forming new equiaxed grains to mitigate work-hardening effects.