In the cases of copper, steel, silver and brass, this process is performed by substantially heating the material for a while and allowing it to cool. Unlike ferrous metals—which must be cooled slowly to anneal—copper, silver and brass can be cooled slowly in air or quickly by quenching in water. In this fashion the black annealed wire is softened and prepared for further work such as shaping, stamping, or forming.
After learning something basic about the principle of annealing, in the following paragraphs I will teach you how to anneal iron wire.
* Mid Tempers
During cold working, galvanized wire's strength increases and ductility drops making additional size reduction difficult. The material must be annealed before further processing in order to restore its ductility. This black annealed wire is referred to as in-process anneal. The same treatment can be applied to materials where customer's specifications require a different set of mechanical properties than those obtained by cold work only. This is commonly referred to as "mid-temper".
* Cold Rolling
Cold rolling changes the dimensions of material by passing it between one or more pairs of driven precision-ground rolls. The incoming material conforms to the space between the rolls or to the shape ground into the rolls.
* Cold Drawing
During cold drawing, material is pulled through a carbide die or turk's head in order to change its shape and reduce its size. A number of draw passes through successive dies may be required, depending on the complexity of the specified shape. Each pass further shapes and reduces the profile's size until it reaches the final cross section.