After doing some research , I concluded that alluminium alloy would best suit the legs of the crane. There are two types, wrought and cast. Cast alluminium alloys are stronger but there are many types. On overage the properties are given below:
Yield strength = 250-450 Mpa
Density = 2600- 2790 kg/m3
Youngs Modulas = 70 - 74 Gpa
Tensile Strength = 300- 550 Mpa
Disadvantages of Alluminium Alloys
Alluminium has a lower tensile strength than steel hence the diameter of the pipe have to be greater in dimension than that of a steel pipe to deal with the same amount of stress.
Alluminium costs more than steel .
Adavantages of Alluminium Alloys
Has a high strength to weight ratio making the crane easier to carry .
It is immune to corrosion unlike iron or even steel to certain extents.
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