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1. Extrusion
(A): is extensively used for making bolts and nuts
(B): is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work
(C): is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
(D): consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
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