Tantalum-Tungsten 2.5%



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 (20o - 500oC): 3.6 x 10-6/oF

Thermal Conductivity (20o - 100 oC): 32 Btu/hr-ftoF

Specific Heat (100 oC): .0336 Btu/lboF

Electrical Resistivity (0o - 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

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