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PRODUCT DATA of Ti 5Al-2.5Sn
MaterialTi 5Al-2.5Sn
General InformationTi-5Al-2.5Sn is an all-alpha alloy available in many product forms and at two purity levels. The high purity grade of this composition is used principally for cryogenic applications and may be characterized as having lower strength but higher ductility and toughness than the standard grade. The normal purity grade also may be used at low temperatures but it is primarily suitable for room to elevated temperature applications (up to 900EF or to 1100EF for short times) where weldability is an important consideration. mmpds
Chemical CompositionTi-5Al-2.5Sn
Name of ManufacturerTIMET
The Hub,Holford Road, Witton, Birmingham B6 7AX, UK

+44 121 356-1155 EuroSales@timet.com
+44 121 356-5413
www.timet.com
EXPERIENCE IN PRACTICE
Equivalent DesignationsUNS R54521, UNS 54520
PHYSICAL PROPERTIES
Specific Gravity4.48
THERMAL PROPERTIES
Thermal Expansion Coefficient9.4 μstrain/°C
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
EMF vs SCE-0.23 V
Bimetallic CorrosionCan be connected without any restriction to: Cr, Cu, Brass, Cu-Ni alloys, Al-bronzes, Si-bronzes, Gun metal, P-bronzes, Sn-bronzes, Ag, 300 and 400 series stainless steel, low alloy steel, Au, Pt, C, Rh
Can be connected in a non-controlled environment to the above and Ni, Monel, Inconel, Ni-Mo alloys
Can be connected in a clean room environment to above and Cd, Al-Cu alloys
Needs specific measures: All others
Test:ECSS-Q-ST-70C Rev.1 Table 5.1
Data Quality: Design Data
WeldingNitrogen, hydrogen, carbon dioxide, and mixtures containing these gases shall not be used
Welding with alloy-matching fillers is recommended, preferably using extra Low Interstitial (ELI) filler wires
SPECIAL RECOMMENDATIONS
Lessons LearnedA great deal of care needs to be exercised to ensure complete inert gas (argon or helium) coverage during welding.