Forging describes a process that transforms solid metal into shapes of varying Cross-sectional material thickness, often involving heating and hammering.

-see also:
"Forging" is in the NAICS Code "33211"
  Forging and Stamping

"Forging" is in the HS Code "8462.10"
  - - Forging or die-stamping machines (including presses) and hammers

"Forging" is in the UNSPSC Code "23161509"
  Forging stamping machines