Titanium

Titanium (pronounced /taɪˈteɪniəm/) is a chemical element with the symbol Ti and atomic number 22. It is a light, strong, lustrous, corrosion-resistant (including to sea water and chlorine) transition metal with a grayish color. The metal is highly resistant to corrosion, including in sea water and chlorine. Titanium was discovered in England by William Gregor in 1791 and named by Martin Heinrich Klaproth for the Titans of Greek mythology.

The planet Reach had plentiful deposits of titanium, which were the original reason for its colonization. With numerous titanium mines, Reach was the largest non-automated exporter of titanium in human-controlled space by 2535.

Applications
Titanium can be alloyed with iron, aluminium, vanadium, molybdenum, among other elements, to produce strong lightweight alloys for aerospace (jet engines, missiles, and spacecraft), military, industrial process (chemicals and petro-chemicals, desalination plants, pulp and paper), automotive, agri-food, medical (prostheses, orthopaedic implants, dental implants), sporting goods, jewelry, and other applications.

Titanium has many military applications, particularly as a form of armor. Titanium is a major component in the UNSC's Titanium-A armor, a form of titanium that has been specifically strengthened on a molecular level. Titanium is used in the construction of the M12 Warthog FAV and its variants. The M808 Scorpion main battle tank is outfitted with thick ceramic-titanium armor plating that is incredibly resilient to damage. ODST armor and Long Range Stealth Orbital Insertion Pod both incorporate titanium as a form of armor. The Covenant used titanium plates beneath the exterior armor of Type-25 Spirit dropships. Non-reflective titanium carbide coating is used on the standard UNSC combat knife. Titanium is used to create strong physical restraints, such as wristlets and chains. Titanium is also used in products such as fire extinguishers, plybars, and protective blast doors. Some artificial limbs used titanium in the joints of the fingers.

Titanium is commonly used as a strong form of structural support. Six bevelled titanium spars were used as support on the Tiara orbiting Harvest. The ceiling of Mack's data center on Harvest was braced with titanium beams. Kurt Ambrose's residence in Camp Currahee on Onyx was reinforced by titanium girders. Titanium supports were also used in the interior of s.