Forged Steel Crankshaft Vs Cast Iron

Where the journals on cast iron cranks becomes work hardened during the machining process forged steel cranks are not so lucky and must instead be heat treated after machining.

Forged steel crankshaft vs cast iron. From the side of internal organization the performance of forged crankshaft is more stable than that of cast ctankshaft. Cast vs forged crankshaft cast crankshafe is one time shaping process while forged crankshaft need to be forged many times. The cast 440 cranks are not cast iron they re cast from steel. This means that a forged shackle is going to last longer.

The decision on which method to use would be made putting into consideration factors such as product size required. Forged parts have a 37 higher fatigue strength resulting in a factor of six longer fatigue life. Choosing the method to create the best finished product possible depends on what the component will be used for hence any of the cast and forged methods may be used. Like cast pistons there is less finish machining to do so they cost less.

A finite element analysis of the crankshafts was conducted using boundary conditions similar to the component test. The best and most sure method for recognizing a forged crank is to look for the parting lines on the. Common heat treating methods for forged cranks include induction hardening tuftriding and nitriding. Summary of cast vs.

With forged steel cranks a metal bar is heated until it is soft then pounded into the rough shape of the. To make a cast crankshaft they heat up iron or steel until it is melted then pour it into a mold the same as with cast pistons. Cast iron only has 66 of the yield strength of forged steel. Cast steel is stronger due to the fact that steel is stronger than iron.

In nodular cast iron they are spherical nodules. Car guys want forged cranks. Yield strength is an indicator of what load a shackle will hold before starting to deform.