A keyring is made by wrapping a length of straight stainless steel wire around the circumference of a cylindrical metal mandrel (tool). Once the keyring is removed from the mandrel, its internal diameter will always be larger than the diameter of the mandrel. This is because:

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Stainless steel is very difficult to form into a ring

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Stainless steel has a face centred cubic crystal structure

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Recovery of elastic strain occurs

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Precise control of deformation processes are difficult to achieve.

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A keyring is made by wrapping a length of straight stainless steel wire around t...

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