Titanium is a metal used on Earth. The first Iris covering the Stargate was made of titanium, but it was destroyed when the Stargate dialed a black hole. It was later replaced with an iris made up of titanium-trinium alloy. (SG1: "Children of the Gods", "A Matter of Time")

In the Pegasus Galaxy, planets where civilizations had access to titanium were rare. Even on the Genii homeworld titanium was rare. By the time of the arrival of the Atlantis expedition, the only two planets known to have significant quantities of titanium were Manaria whose people dealt in metal ores and Sateda where the Satedans used it to build various things, including buildings. The Atlantis expedition were able to make a deal with the Satedans for some titanium to build an iris for the Atlantis Stargate in the aftermath of the Raid on Atlantis. (SGA: "Allegiance")

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