Below is a list of Metal Forging manufacturers from Massapequa Park, New York. Metal forging is a metal forming process that involves the plastic deformation of metal through extreme pressure. Usually metal forging is performed at high temperatures, but it can also be done ‘cold’ at temperatures below the re-crystallization point of the metal. As one the oldest known metalworking processes, metal forging has evolved over the centuries to include innovative and diverse techniques.