R30012 Cobalt vs. R05255 Alloy

R30012 cobalt belongs to the cobalt alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is R05255 alloy.

UNS R30012 Co-Cr-W Alloy UNS R05255 Tantalum-Tungsten Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		190

Elongation at Break, %		1.0
Elongation at Break, %		20

Poisson's Ratio		0.28
Poisson's Ratio		0.34

Shear Modulus, GPa		86
Shear Modulus, GPa		70

Tensile Strength: Ultimate (UTS), MPa		830
Tensile Strength: Ultimate (UTS), MPa		540

Tensile Strength: Yield (Proof), MPa		650
Tensile Strength: Yield (Proof), MPa		450

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		140

Specific Heat Capacity, J/kg-K		440
Specific Heat Capacity, J/kg-K		140

Thermal Conductivity, W/m-K		15
Thermal Conductivity, W/m-K		59

Thermal Expansion, µm/m-K		12
Thermal Expansion, µm/m-K		6.6

Otherwise Unclassified Properties

Density, g/cm³		8.8
Density, g/cm³		17

Embodied Water, L/kg		480
Embodied Water, L/kg		630

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		7.7
Resilience: Ultimate (Unit Rupture Work), MJ/m³		100

Resilience: Unit (Modulus of Resilience), kJ/m³		960
Resilience: Unit (Modulus of Resilience), kJ/m³		530

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		6.3

Stiffness to Weight: Bending, points		23
Stiffness to Weight: Bending, points		11

Strength to Weight: Axial, points		26
Strength to Weight: Axial, points		9.1

Strength to Weight: Bending, points		22
Strength to Weight: Bending, points		8.9

Thermal Diffusivity, mm²/s		3.8
Thermal Diffusivity, mm²/s		25

Thermal Shock Resistance, points		23
Thermal Shock Resistance, points		31

Alloy Composition

Carbon (C), %		1.4 to 2.0
Carbon (C), %		0 to 0.010

Chromium (Cr), %		27 to 32
Chromium (Cr), %		0

Cobalt (Co), %		47.5 to 64.1
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), %		0 to 1.0
Molybdenum (Mo), %		0 to 0.020

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

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

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

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

Silicon (Si), %		0 to 2.0
Silicon (Si), %		0 to 0.0050

Tantalum (Ta), %		0
Tantalum (Ta), %		95.9 to 98

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

Tungsten (W), %		7.5 to 9.5
Tungsten (W), %		2.0 to 3.5