Hot forging: a forging process carried out above the temperature of metal recrystallization.
Hot rolling: a rolling process carried out above the recrystallization temperature.
Cold rolling: a rolling process in which the plastic deformation temperature is lower than the recovery temperature.
Annealing: A metal heat treatment process in which a metal is slowly heated to a certain temperature, held for sufficient time, and then cooled at an appropriate rate (usually slow cooling, sometimes controlled cooling).
Pickling: Immerse the workpiece in an aqueous solution of sulfuric acid or other substances to remove thin films such as oxides on the metal surface. It is a pre-treatment or intermediate treatment for electroplating, enamel, rolling and other processes
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