From Halopedia, the Halo wiki
TR steel alloy is a type of steel used by the UNSC for large warships. Background[edit]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 tell a ship's age by the color of the TR steel in its superstructure.[1] List of appearances[edit]
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