Hot forging is a forging process performed above the metal recrystallization temperature.
Hot rolling is a rolling process performed at a high recrystallization temperature.
Cold rolling is a rolling process in which the plastic shu 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 speed (usually slow cooling, sometimes controlled cooling).
Pickling: The parts are immersed in an aqueous solution such as sulfuric acid to remove oxide films on the metal surface. It is the pretreatment or intermediate treatment of electroplating, enamel, rolling, and other processes