Reactor Grade Zirconium vs. R30605 Cobalt

Reactor grade zirconium belongs to the otherwise unclassified metals classification, while R30605 cobalt belongs to the cobalt alloys. There are 18 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 reactor grade zirconium and the bottom bar is R30605 cobalt.

Reactor Grade (R60001) Zirconium UNS R30605 (L605, Alloy 25, 2.4964) Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		98
Elastic (Young's, Tensile) Modulus, GPa		210

Elongation at Break, %		21
Elongation at Break, %		34

Poisson's Ratio		0.34
Poisson's Ratio		0.29

Shear Modulus, GPa		37
Shear Modulus, GPa		81

Tensile Strength: Ultimate (UTS), MPa		330
Tensile Strength: Ultimate (UTS), MPa		1130 to 1900

Tensile Strength: Yield (Proof), MPa		160
Tensile Strength: Yield (Proof), MPa		470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g		250
Latent Heat of Fusion, J/g		290

Specific Heat Capacity, J/kg-K		270
Specific Heat Capacity, J/kg-K		410

Thermal Conductivity, W/m-K		22
Thermal Conductivity, W/m-K		9.6

Thermal Expansion, µm/m-K		5.9
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Density, g/cm³		6.5
Density, g/cm³		9.6

Embodied Water, L/kg		280
Embodied Water, L/kg		450

Common Calculations

Stiffness to Weight: Axial, points		8.4
Stiffness to Weight: Axial, points		12

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		21

Strength to Weight: Axial, points		14
Strength to Weight: Axial, points		33 to 55

Strength to Weight: Bending, points		16
Strength to Weight: Bending, points		25 to 36

Thermal Diffusivity, mm²/s		13
Thermal Diffusivity, mm²/s		2.5

Thermal Shock Resistance, points		41
Thermal Shock Resistance, points		31 to 52

Alloy Composition

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Carbon (C), %		0
Carbon (C), %		0.050 to 0.15

Chromium (Cr), %		0
Chromium (Cr), %		19 to 21

Cobalt (Co), %		0
Cobalt (Co), %		46.4 to 57

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

Manganese (Mn), %		0
Manganese (Mn), %		1.0 to 2.0

Nickel (Ni), %		0
Nickel (Ni), %		9.0 to 11

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.040

Silicon (Si), %		0
Silicon (Si), %		0 to 0.4

Sulfur (S), %		0
Sulfur (S), %		0 to 0.030

Tungsten (W), %		0
Tungsten (W), %		14 to 16

Zirconium (Zr), %		99.7 to 100
Zirconium (Zr), %		0

Residuals, %		0 to 0.27
Residuals, %		0