R05240 Alloy vs. R31538 Cobalt

R05240 alloy belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R05240 alloy and the bottom bar is R31538 cobalt.

UNS R05240 Tantalum-Niobium Alloy High Carbon Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 2, ISO 5832-12 Alloy 2, R31538)

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		150
Elastic (Young's, Tensile) Modulus, GPa		220

Elongation at Break, %		25
Elongation at Break, %		13 to 23

Poisson's Ratio		0.36
Poisson's Ratio		0.29

Shear Modulus, GPa		57
Shear Modulus, GPa		86

Tensile Strength: Ultimate (UTS), MPa		270
Tensile Strength: Ultimate (UTS), MPa		1020 to 1360

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		580 to 930

Thermal Properties

Latent Heat of Fusion, J/g		210
Latent Heat of Fusion, J/g		320

Specific Heat Capacity, J/kg-K		190
Specific Heat Capacity, J/kg-K		450

Thermal Expansion, µm/m-K		6.8
Thermal Expansion, µm/m-K		13

Otherwise Unclassified Properties

Density, g/cm³		14
Density, g/cm³		8.4

Embodied Water, L/kg		460
Embodied Water, L/kg		530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		59
Resilience: Ultimate (Unit Rupture Work), MJ/m³		140 to 200

Resilience: Unit (Modulus of Resilience), kJ/m³		90
Resilience: Unit (Modulus of Resilience), kJ/m³		750 to 1920

Stiffness to Weight: Axial, points		6.3
Stiffness to Weight: Axial, points		15

Stiffness to Weight: Bending, points		13
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		5.4
Strength to Weight: Axial, points		34 to 45

Strength to Weight: Bending, points		6.8
Strength to Weight: Bending, points		27 to 32

Thermal Shock Resistance, points		18
Thermal Shock Resistance, points		25 to 33

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		0.15 to 0.35

Chromium (Cr), %		0
Chromium (Cr), %		26 to 30

Cobalt (Co), %		0
Cobalt (Co), %		58.7 to 68.9

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

Iron (Fe), %		0 to 0.010
Iron (Fe), %		0 to 0.75

Manganese (Mn), %		0
Manganese (Mn), %		0 to 1.0

Molybdenum (Mo), %		0 to 0.020
Molybdenum (Mo), %		5.0 to 7.0

Nickel (Ni), %		0 to 0.010
Nickel (Ni), %		0 to 1.0

Niobium (Nb), %		35 to 42
Niobium (Nb), %		0

Nitrogen (N), %		0 to 0.010
Nitrogen (N), %		0 to 0.25

Oxygen (O), %		0 to 0.020
Oxygen (O), %		0

Silicon (Si), %		0 to 0.0050
Silicon (Si), %		0 to 1.0

Tantalum (Ta), %		57.9 to 65
Tantalum (Ta), %		0

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

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