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a lengthy semifinished metal product used in producing parts through plastic deformation or machining. The billet’s cross section is usually round but, depending on its intended use, may also be hexagonal, rectangular, trapezoidal, oval, or segmental. Billets are produced on a large scale from sufficiently ductile materials through the rolling process. Extrusion is used in producing smaller quantities from less ductile material, and forging is preferred when a large diameter is required. After rolling or extrusion, the billets are calibrated by hot or cold drawing in order to increase the precision of the shape or, in a number of cases, to improve the mechanical properties.