Forging refines defects from cast ingots or continuous cast bar. A casting has neither grain flow nor directional strength and the casting process cannot prevent formation of certain metallurgical defects. Pre-working forge stock produces a grain flow oriented in directions requiring maximum strength. Dendritic structures, alloy segregations, and similar imperfections are also refined in forging.

Dec 29, 2018

Forgings are consistently more reliable and often less costly over time compared to castings. Casting defects occur in a variety of forms. Because hot working refines grain patterns and imparts high strength, ductility, and resistance to each forged piece they are also more durable. Also, they are manufactured without the added costs for tighter process controls and inspection that are required for castings.

Forgings can be nearly any shape, which reduces the need for joining multiple pieces. Reducing the joint can improve the overall strength of the unit as the forging does not need to be welded or otherwise fastened together.