Type 1 Niobium vs. R30001 Cobalt

Type 1 niobium belongs to the otherwise unclassified metals classification, while R30001 cobalt belongs to the cobalt alloys. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is Type 1 niobium and the bottom bar is R30001 cobalt.

Type 1 (Unalloyed Reactor Grade, R04200) Niobium UNS R30001 Co-Cr-W Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		110
Elastic (Young's, Tensile) Modulus, GPa		220

Elongation at Break, %		29
Elongation at Break, %		1.0

Poisson's Ratio		0.4
Poisson's Ratio		0.28

Shear Modulus, GPa		38
Shear Modulus, GPa		86

Tensile Strength: Ultimate (UTS), MPa		140
Tensile Strength: Ultimate (UTS), MPa		620

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		310

Specific Heat Capacity, J/kg-K		270
Specific Heat Capacity, J/kg-K		430

Thermal Conductivity, W/m-K		52
Thermal Conductivity, W/m-K		15

Thermal Expansion, µm/m-K		7.3
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		8.6
Density, g/cm³		9.0

Embodied Water, L/kg		160
Embodied Water, L/kg		460

Common Calculations

Stiffness to Weight: Axial, points		6.8
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		18
Stiffness to Weight: Bending, points		22

Strength to Weight: Axial, points		4.6
Strength to Weight: Axial, points		19

Strength to Weight: Bending, points		7.1
Strength to Weight: Bending, points		18

Thermal Diffusivity, mm²/s		23
Thermal Diffusivity, mm²/s		3.7

Thermal Shock Resistance, points		13
Thermal Shock Resistance, points		19

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		2.0 to 3.0

Chromium (Cr), %		0
Chromium (Cr), %		28 to 32

Cobalt (Co), %		0
Cobalt (Co), %		43 to 59

Hafnium (Hf), %		0 to 0.020
Hafnium (Hf), %		0

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

Iron (Fe), %		0 to 0.0050
Iron (Fe), %		0 to 3.0

Molybdenum (Mo), %		0 to 0.010
Molybdenum (Mo), %		0 to 1.0

Nickel (Ni), %		0 to 0.0050
Nickel (Ni), %		0 to 3.0

Niobium (Nb), %		99.7 to 100
Niobium (Nb), %		0

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

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

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

Tantalum (Ta), %		0 to 0.1
Tantalum (Ta), %		0

Titanium (Ti), %		0 to 0.020
Titanium (Ti), %		0

Tungsten (W), %		0 to 0.030
Tungsten (W), %		11 to 13

Zirconium (Zr), %		0 to 0.020
Zirconium (Zr), %		0