Titanium, newest of the common construction materials, has such superior corrosion resistance that it is now considered virtually indispensable for process vessels that must withstand attack from wet chlorine and chlorides, certain acids and other aggressive chemicals. But because vessels of solid titanium may cost two to four times the equivalent in stainless steel, there is considerable incentive to use titanium as a corrosion-resistant lining and rely on a less costly carbon steel backing for strength.

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