TR Steel

TR Steel Alloy is a type of building material used by the UNSC for large warships. 
==Background==
TR steel alloy is used to build the superstructure of the ship before it is plated with Vanadium steel and, eventually, Titanium-A battleplate.
A curious feature of TR steel alloy is that, as it is exposed to solar radiation over time, it gradually turns from silver to white. It is easy to determine a ship's age by the color of the TR steel in its superstructure.Halo: Ghosts of Onyx, page 52
==Sources==
Category:UNSC
Category:Materials
Category:Halo: Ghosts of Onyx