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Annealing, in metallurgy and materials science, is a heat treatment that alters the physical and sometimes chemical properties of a material to increase its ductility and reduce its hardness, making it more workable. It involves heating a material to above its recrystallization temperature, maintaining a suitable temperature, and then cooling.
In the cases of copper, steel, silver, and brass, this process is performed by heating the material (generally until glowing) for a while and then slowly letting it cool to room temperature in still air. Copper, silver and brass can be cooled slowly in air, or quickly by quenching in water, unlike ferrous metals, such as steel, which must be cooled slowly to anneal. In this fashion, the metal is softened and prepared for further work—such as shaping, stamping, or forming.
If you are interested in annealing copper by yourself, check this link to find a DIY instruction step by step.
Because there is additional processes for annealing copper tubes, normally, annealed copper tube is more expensive than non-annealed copper tube.
In the industrialized process, annealing aims to:
Reference: "EFFECT OF GRAIN SIZE AND ANNEALING TREATMENT ON STEADY STATE CREEP OF COPPER", Barrett, C. R. ; Lytton, J. L. ; Sherby, O. D.