https://www.nickelalloytubes.com/products/titanium-alloy-steel-pipe-tube/ TITANIUM ALLOY STEEL TUBE Titanium is the ninth most abundant element in the earth's crust and the seventh most abundant metal. Using titanium alloy, the Titanium alloy tube has low density, which is slightly over half that of steel, and high strength combination. That is why titanium alloy pipes gain growing preference in both military and commercial aircraft.