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When copper is cooled (at practically any rate) from its molten form to solid form, it naturally has a cubic crystal structure that makes it soft and easily bent. However, whenever the metal is bent, formed, or worked in when in its solid state, changes are made in its crystal structure that cause the metal to become stronger and stiffer.

When copper wire is made by the "drawing" process, solid rods of copper are pulled through ever smaller dies (forms) until the desired size is made. This process causes the originally soft copper to become hard. Thus "hard drawn copper wire" is the wire as it naturally used to come off the mill. Nowadays, most copper wire is actually heat treated (at roughly one half its melting point) at the end of the drawing process to make it soft again so that it can be easily handled by electricians and builders.

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