Low-oxygen Zirconium vs. R30021 Cobalt

Low-oxygen zirconium belongs to the otherwise unclassified metals classification, while R30021 cobalt belongs to the cobalt alloys. 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 low-oxygen zirconium and the bottom bar is R30021 cobalt.

Low-Oxygen (R60700) Zirconium UNS R30021 Co-Cr-W Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		98
Elastic (Young's, Tensile) Modulus, GPa		220

Elongation at Break, %		23
Elongation at Break, %		9.0

Poisson's Ratio		0.34
Poisson's Ratio		0.29

Shear Modulus, GPa		37
Shear Modulus, GPa		86

Tensile Strength: Ultimate (UTS), MPa		330
Tensile Strength: Ultimate (UTS), MPa		700

Tensile Strength: Yield (Proof), MPa		270
Tensile Strength: Yield (Proof), MPa		500

Thermal Properties

Latent Heat of Fusion, J/g		250
Latent Heat of Fusion, J/g		330

Specific Heat Capacity, J/kg-K		270
Specific Heat Capacity, J/kg-K		450

Thermal Conductivity, W/m-K		22
Thermal Conductivity, W/m-K		15

Thermal Expansion, µm/m-K		5.7
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		6.7
Density, g/cm³		8.4

Embodied Water, L/kg		450
Embodied Water, L/kg		520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		70
Resilience: Ultimate (Unit Rupture Work), MJ/m³		57

Resilience: Unit (Modulus of Resilience), kJ/m³		370
Resilience: Unit (Modulus of Resilience), kJ/m³		570

Stiffness to Weight: Axial, points		8.1
Stiffness to Weight: Axial, points		15

Stiffness to Weight: Bending, points		23
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		14
Strength to Weight: Axial, points		23

Strength to Weight: Bending, points		16
Strength to Weight: Bending, points		21

Thermal Diffusivity, mm²/s		12
Thermal Diffusivity, mm²/s		3.8

Thermal Shock Resistance, points		42
Thermal Shock Resistance, points		21

Alloy Composition

Carbon (C), %		0 to 0.050
Carbon (C), %		0.2 to 0.35

Chromium (Cr), %		0 to 0.2
Chromium (Cr), %		26 to 29

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

Hafnium (Hf), %		0 to 4.5
Hafnium (Hf), %		0

Hydrogen (H), %		0 to 0.0050
Hydrogen (H), %		0

Iron (Fe), %		0 to 0.2
Iron (Fe), %		0 to 3.0

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

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

Nitrogen (N), %		0 to 0.025
Nitrogen (N), %		0

Oxygen (O), %		0 to 0.1
Oxygen (O), %		0

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

Zirconium (Zr), %		94.7 to 100
Zirconium (Zr), %		0