Recrystallization means restoring the original structure and the plastic properties of steel which had previously undergone cold-worked deformation, with a consequent increase in hardness. Therefore, when a metal is deformed by cold-working, its structure is oriented according to the directional components of the deformation. Its hardness increases and its capacity to undergo further deformation diminishes. In order to carry out further cold-working, it is necessary to use crystallization which restores the original structure and plasticity. Recrystallization enables steel to take on its former metallic structure and ensures that it is ready for a new phase of working.