Which one of the following materials will require the largest size of riser for the same size of casting? (a) aluminium (b) cast iron (c) steel (d) copper?
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Steel will require the largest size of riser for the same size of casting.
This is because steel has the optimum shrinkage allowance. Shrinkage for carbon steel amounts to about 3% during solidification.
Additional reduction in volume is undergone by the liquid metal after pouring.
These contractions ought to produce porosity, in case the riser or the metal reservoir of the liquid supplies metal feed, which is liquid in nature until solidification is completed.
This is because steel has the optimum shrinkage allowance. Shrinkage for carbon steel amounts to about 3% during solidification.
Additional reduction in volume is undergone by the liquid metal after pouring.
These contractions ought to produce porosity, in case the riser or the metal reservoir of the liquid supplies metal feed, which is liquid in nature until solidification is completed.
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