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Ta-10W

Tantalum-10% Tungsten(Ta-10W) is used in the aerospace industry for hot-gas valves, rocket engine skirts and in the chemical industry for corrosion resistant valves and liners.
Chemical composition according to ASTM B365 92 R05255 as follows:
 
Tantalum(Ta) Remainder
Tungsten(W) 9.00-11.00%
Carbon (C) 0.0100%max
Oxygen (O) 0.0150%max
Nitrogen (N) 0.0100%max
Hydrogen(H) 0.0020%max
Niobium (Nb) 0.1000%max
Iron (Fe) 0.0100%max
Titanium(Ti) 0.0100%max