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	PRODUCT DATA of Ti 5Al-2.5Sn

Material	Ti 5Al-2.5Sn
General Information	Ti-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 Composition	Ti-5Al-2.5Sn
Name of Manufacturer	TIMET 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 Designations

UNS R54521, UNS 54520

	PHYSICAL PROPERTIES

Specific Gravity

4.48

	THERMAL PROPERTIES

Thermal Expansion Coefficient

9.4 μstrain/°C

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

EMF vs SCE	-0.23 V
Bimetallic Corrosion	Can 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
Welding	Nitrogen, 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 Learned

A great deal of care needs to be exercised to ensure complete inert gas (argon or helium) coverage during welding.