Tantalum-Tungsten 2.5% alloy is a high strength alloy for corrosion applications in heat transfer equipment, vessels, piping, etc., and all applications where tantalum’s physical properties are desired at a higher strength level than pure tantalum.

Typical Composition (ppm):

              Ti          100 max                    Ni          100 max

              Mo        200 max                    Si           25 max

              Fe         100 max                    Nb         0.5% max

              W        2.0 - 3.5 wt %             Ta          balance

               C          50 max                     O          150 max

               N          50 max                     H          15 max

Typical Properties:

Density at 20 ^oC: 16.66 g/cc, (.602 lb/in³)

Melting Point: 3014 ^oC (5457 ^oF)

Coefficient of Expansion (20^o - 500^oC): 3.6 x 10^-6/^oF

Thermal Conductivity (20^o - 100 ^oC): 32 Btu/hr-ft^oF

Specific Heat (100 ^oC): .0336 Btu/lb^oF

Electrical Resistivity (0^o - 100 ^oC): 14.7 microhm ⋅ cm

Typical Ultimate Tensile Strength (20 ^oC): 45,000 - 55,000 psi

Typical Yield Strength (20 ^oC): 35,000 - 45,000 psi

Young's Modulus of Elasticity: 27 x 10⁶ psi

Recrystallization Temperature: 1315 ^oC

Stress Relieving Temperature: 1095 ^oC

Hardness as Annealed (Typical):  HV        115 - 160

                                                       HR          50 - 80

Thermal Neutron Absorption Cross Section: 21.3 b

Mechanical Properties (min):

                                                                       0.2%                          % 

                           Tensile Strength         Yield Strength          Elongation

        Temp ^oC              (psi)                           (psi)                       in 1"

         20                      50,000                         35,000                      20

        100                     48,000                         30,000                      15

        200                    42,000                          27,400                      10

        250                    40,000                         25,500                       10