Titanium

[prepare]

ok i found the following types of titanium that are used in airctafts.

1 Titanium Ti-6Al-4V (Grade 5), Annealed
2 Titanium Ti-6Al-4V (Grade 5), STA
3 Titanium Ti-6Al-4V (Grade 5), ELI, Annealed
4 Titanium Ti-6Al-4V (Grade 5), Annealed Bar
5 Titanium Ti-6Al-4V (Grade 5), STA Bar

i presume the second one is comoonly used but does anybody know for sure which one is used commonly in aircrafts and explain (apart from annealed which i know) what the endings mean STA etc....

[mrbatfink]

STA: Solution Treated and Aged

ELI: Extra Low. Interstitial