R30021 Cobalt vs. R05240 Alloy

R30021 cobalt belongs to the cobalt alloys classification, while R05240 alloy belongs to the otherwise unclassified metals. 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 R30021 cobalt and the bottom bar is R05240 alloy.

UNS R30021 Co-Cr-W Alloy UNS R05240 Tantalum-Niobium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		9.0
Elongation at Break, %		25

Poisson's Ratio		0.29
Poisson's Ratio		0.36

Shear Modulus, GPa		86
Shear Modulus, GPa		57

Tensile Strength: Ultimate (UTS), MPa		700
Tensile Strength: Ultimate (UTS), MPa		270

Tensile Strength: Yield (Proof), MPa		500
Tensile Strength: Yield (Proof), MPa		170

Thermal Properties

Latent Heat of Fusion, J/g		330
Latent Heat of Fusion, J/g		210

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

Thermal Expansion, µm/m-K		11
Thermal Expansion, µm/m-K		6.8

Otherwise Unclassified Properties

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

Embodied Water, L/kg		520
Embodied Water, L/kg		460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		57
Resilience: Ultimate (Unit Rupture Work), MJ/m³		59

Resilience: Unit (Modulus of Resilience), kJ/m³		570
Resilience: Unit (Modulus of Resilience), kJ/m³		90

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

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

Strength to Weight: Axial, points		23
Strength to Weight: Axial, points		5.4

Strength to Weight: Bending, points		21
Strength to Weight: Bending, points		6.8

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		18

Alloy Composition

Carbon (C), %		0.2 to 0.35
Carbon (C), %		0 to 0.010

Chromium (Cr), %		26 to 29
Chromium (Cr), %		0

Cobalt (Co), %		61.7 to 67.3
Cobalt (Co), %		0

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

Iron (Fe), %		0 to 3.0
Iron (Fe), %		0 to 0.010

Molybdenum (Mo), %		4.5 to 6.0
Molybdenum (Mo), %		0 to 0.020

Nickel (Ni), %		2.0 to 3.0
Nickel (Ni), %		0 to 0.010

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

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

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

Silicon (Si), %		0 to 1.5
Silicon (Si), %		0 to 0.0050

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

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

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