First of all, cast tin bronze is a kind of copper alloy. Others include beryllium bronze and aluminum bronze. Tin bronze should be the main material for marine propellers, right? ~ If I remember correctly! It should also be used for casting other pump impellers that are resistant to seawater corrosion.
There are two kinds of casting process. Large parts, such as propellers, usually have a few tons or even ten tons; small parts, if it is an impeller, are usually tens of kilograms, and 100 kilograms are dead! Take these two as examples.
For large parts, especially the propellers must be all sand gravity casting. The sand material should generally be phenolic resin sand (not completely certain), and the smelting is generally an intermediate frequency furnace + electric arc furnace, right? ? There are options according to the grade!
For small parts, sand gravity casting can be used for less demanding ones, low pressure casting or vacuum suction casting can be used for high demanding ones!
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