Titanium equipment is often used in severe corrosive environments encountered in the chemical processing industries. Titanium has been considered an exotic wonder metal by many people. This was particularly true in reference to castings. However, increasing demands and rapidly advancing technology have permitted titanium castings to be commercially available at an economical cost. The combination of its cost, strength, corrosion resistance, and service life in very demanding corrosive environments suggest its selection in applications where titanium castings have never been considered in the past. Grade 5 is the most commonly used Titanium alloy, and is heat treatable.