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