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The propellers can be manufactured of many types of materials, the most used are those derived from aluminum, steels and bronze.
The properties that must be considered regarding the material for the manufacture of propellers are the following:
That it satisfies the mechanical qualities (hardness and elasticity) required by the boat needs.
It must be resistant to corrosion from sea water and erosion.
It must be suitable for machining.
In the event of a possible breakdown, it must be easy to straighten, weld and even melt with new grafts.
The most used materials are:
Manganese bronze
Manganese bronze (high strength yellow brass) combines high tensile strength and high elastic limit with relatively good corrosion resistance. This group of alloys is basically made up
of copper and zinc to which aluminum is added, which is the main fortifier, in addition to manganese and iron, which act as grain refiners; tin and nickel are mainly added to increase
corrosion resistance.
Aluminium bronze
Aluminum bronze is a non-ferrous alloy with a fine structure of medium ductility and high mechanical resistance, where its main component is aluminum to copper, which makes it possible
to achieve said alloy. It is one of the best known and most common in aluminum bronze casting. Its main characteristics are its high resistance to high loads, in addition to the fatigue,
abrasion, cavitation, mechanical deformation or chemical erosion, emphasizing its high level to resist wear, corrosion (resistant to seawater at extreme temperatures of cold and heat,
to non-oxidizing acids and extreme corrosive conditions even when hot), saline and Brinel hardness.
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