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Cast steel is stronger due to the fact that steelis stronger than iron. To make a cast crankshaft, they heatup iron or steel until it is melted then pour it into a mold, thesame as with cast pistons. With forged steel cranks,a metal bar is heated until it is soft then pounded into the roughshape of the crankshaft.
Subsequently, one may also ask, what is difference between cast and forged?
Forging and casting are two verydifferent manufacturing methods. When something iscast the material is heated above its melting temperatureand poured into a mold where it solidifies. When something isforged it is physically forced into shape while remainingin a solid state – although it is frequentlyheated.
Regarding this, why are crankshafts forged?
Forging and casting Crankshafts can be forged from a steelbar usually through roll forging or cast in ductile steel.Today more and more manufacturers tend to favor the use offorged crankshafts due to their lighter weight, more compactdimensions and better inherent damping.
As its name suggests, however, cast iron is meantsolely to be cast; it cannot be forged. On the otherhand, steel can be either cast or forged into thedesired shape. It can also be welded and is generally stronger thancast iron, making it a suitable choice for high-pressure,high-temperature use.