Plastically deforming metal at ambient temperatures to increase the cross-sectional area of the The material to be forged regardless of form. Also, an individual piece of metal used to produce a single forging. (either solid A section hot rolled from a billet to a form, such as round, hexagonal, octagonal, square, or rectangular, with sharp or rounded corners or edges, with a cross-sectional area of less than 16 sq in. (A solid section that is long in relation to its cross-sectional dimensions, having a completely symmetrical cross section and whose width or greatest distance between parallel faces is 3/8 in. or more).... More or tubing) at one or more points along the longitudinal axis. See also The upsetting of wire, rod, or bar stock in dies to form parts that usually contain portions that are greater in cross-sectional area than the original wire, rod, or bar. and Upsetting.