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Materials for Marine Propellers
Materials for Marine Propellers
The material of marine propellers is mainly copper alloy,cast iron and cast steel.However, with the development of science and technology,many new materials, such as FRP and nylon, have become one of the manufacturing materials of the propellers.The material needs sufficient mechanical properties, but also needs chemical properties compatible with a variety of metals.
As a commonly used propeller material, manganese bronze has the characteristics of high elongation, good impact resistance and corrosion resistance. This material is commonly used in the manufacture of propellers for marine vessels. However, this material has poor resistance to cavitation erosion.
Aluminum bronze is a multi-metal alloy mainly composed of copper-aluminum alloy. It adds manganese, iron, nickel and other elements to the copper-aluminum. In addition to the advantages of manganese bronze, it has relatively low weight and fatigue. Its disadvantage is high technical requirements for smelting and pouring.Besides,the problems of cold brittleness of large castings are difficult to handle.More importantly, it's too expensive.
Cast iron propellers are widely used in small vessels because of their low cost and easy casting.Due to low mechanical strength,they are easily brittle and fragile.Marine propellers will have a short service life.At the same time, the thickness of the cutting surface makes the propeller's operating efficiency lower, so the propeller can only be used on small low-speed ships.
