Hot forging is a forging process performed above the metal recrystallization temperature. Hot rolling is a rolling process performed at a temperature higher than 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 that slowly heats the metal to a certain temperature, keeps it for a sufficient time, and then cools it at an appropriate rate (usually slow cooling, sometimes controlled cooling). Pickling: The parts are immersed in an aqueous solution such as sulfuric acid to remove oxides and other films on the metal surface. It is the pre-treatment or intermediate treatment of electroplating, enamel, rolling and other processes.
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