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Tantalum-2.5% Tungsten (Ta-2.5W)

Tantalum-2.5% Tungsten (Ta-2.5W) is used in the aerospace industry for hot-gas valves and in the chemical industry for corrosion resistant heat exchangers, valves and liners.
CHEMICAL COMPOSITION ACCORDING TO ASTM B365 92 R05252 AS FOLLOWS:
Tantalum (Ta) Remainder
Tungsten (W) 2.00-3.50%
Carbon (C) 0.0100%max
Oxygen (O) 0.0150%max
Nitrogen (N) 0.0100%max
Hydrogen (H) 0.0015%max
Niobium (Nb) 0.5000%max
Iron (Fe) 0.0100%max
Titanium (Ti) 0.0100%max