Materials and Construction
Titanium metal

None of these
Is used in oceanographic and space exploration applications
Can not be welded
Exists in three allotropic forms

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Materials and Construction
Wrought iron is

High carbon iron
Malleable & ductile; and hence is used for chain links, hooks & couplings
Highly resistance to acid corrosion
An alloy of iron, chromium & carbon

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Materials and Construction
Lead pipe is

All of these
Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
Especially resistant to solutions containing H₂SO₄
Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain

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