Titanium is widely used in the aerospace industry where it is valued for its high strength-to-weight ratio and resistance to corrosion.
Allegheny Technologies (NYSE: ATI) - http://www.alleghenytechnologies.com/ - The major supplier of titanium to Boeing. Their titanium operations are in a number of segments. Allegheny Ludlum makes titanium sheets, strips, plates and foil. Their Allvac operation makes titanium bars, ingots, billets and rods. Titanium International makes commercially pure titanium and titanium alloys in sheet, plate, bar, billet, tube and wire. Wah Chang is a provider of a number of other specialty metals and alloys.