R05400 Tantalum vs. R05255 Alloy

Both R05400 tantalum and R05255 alloy are otherwise unclassified metals. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is R05400 tantalum and the bottom bar is R05255 alloy.

UNS R05400 Sintered Unalloyed Tantalum UNS R05255 Tantalum-Tungsten Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		190

Elongation at Break, %		1.1 to 28
Elongation at Break, %		20

Poisson's Ratio		0.34
Poisson's Ratio		0.34

Shear Modulus, GPa		69
Shear Modulus, GPa		70

Tensile Strength: Ultimate (UTS), MPa		210 to 540
Tensile Strength: Ultimate (UTS), MPa		540

Tensile Strength: Yield (Proof), MPa		140 to 390
Tensile Strength: Yield (Proof), MPa		450

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		140

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		140

Thermal Conductivity, W/m-K		59
Thermal Conductivity, W/m-K		59

Thermal Expansion, µm/m-K		6.5
Thermal Expansion, µm/m-K		6.6

Otherwise Unclassified Properties

Density, g/cm³		17
Density, g/cm³		17

Embodied Water, L/kg		650
Embodied Water, L/kg		630

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		5.5 to 53
Resilience: Ultimate (Unit Rupture Work), MJ/m³		100

Resilience: Unit (Modulus of Resilience), kJ/m³		50 to 420
Resilience: Unit (Modulus of Resilience), kJ/m³		530

Stiffness to Weight: Axial, points		6.2
Stiffness to Weight: Axial, points		6.3

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		11

Strength to Weight: Axial, points		3.6 to 9.0
Strength to Weight: Axial, points		9.1

Strength to Weight: Bending, points		4.8 to 8.8
Strength to Weight: Bending, points		8.9

Thermal Diffusivity, mm²/s		25
Thermal Diffusivity, mm²/s		25

Thermal Shock Resistance, points		13 to 32
Thermal Shock Resistance, points		31

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		0 to 0.010

Hydrogen (H), %		0 to 0.0015
Hydrogen (H), %		0 to 0.0015

Iron (Fe), %		0 to 0.010
Iron (Fe), %		0 to 0.010

Molybdenum (Mo), %		0 to 0.020
Molybdenum (Mo), %		0 to 0.020

Nickel (Ni), %		0 to 0.010
Nickel (Ni), %		0 to 0.010

Niobium (Nb), %		0 to 0.1
Niobium (Nb), %		0 to 0.5

Nitrogen (N), %		0 to 0.010
Nitrogen (N), %		0 to 0.010

Oxygen (O), %		0 to 0.030
Oxygen (O), %		0 to 0.015

Silicon (Si), %		0 to 0.0050
Silicon (Si), %		0 to 0.0050

Tantalum (Ta), %		99.7 to 100
Tantalum (Ta), %		95.9 to 98

Titanium (Ti), %		0 to 0.010
Titanium (Ti), %		0 to 0.010

Tungsten (W), %		0 to 0.050
Tungsten (W), %		2.0 to 3.5