5-2.5Sn ELI

Common Name
5-2.5Sn ELI 5-2.5 Extra Low Interstitial
General Information
Ti-5Al-2.5Sn ELI alloy’s most common use is for cryogenic applications. It is used for the main booster pumps (liquid oxygen and hydrogen) on the space shuttle. This alpha alloy is available in bar, billet, castings, extrusions, plate, sheet, and wire.
Common Specification
Specification Product Form
AMS 4909 Strip, Sheet and Plate
AMS 4924 Bar, Ring, and Forgings


Chemistry Requirements
N C H Fe O Al Sn Y Residuals Each Max Residuals Max Total Ti
0.035 0.05 0.013 0.25 0.12 4.5-5.75 2.0-3.0 0.01 0.1 0.4 Balance

% Maximum unless given as a range.

Minimum Tensile Properties
Condition UTS ksi (Mpa) >0.2%YS ksi (MPA) % El. % RA* Size
Forgings 100 (689) 90 (620) 10 25 <3”


Typical Tensile Properties
Condition UTS ksi (Mpa) >0.2%YS ksi (MPA) % El. % RA* Size
Bar, Forged 118 (815 103 (710) 19 34
Casting 115 (795) 105 (725) 10 17

Note: Typical properties are not to be utilized as a requirement, but are only listed for guidance. These properties may or may not be attainable in all circumstances.
* %Ra not required by all specifications
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