Nuclear Grade Hafnium vs. C84400 Valve Metal

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while C84400 valve metal belongs to the copper alloys. There are 17 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 nuclear grade hafnium and the bottom bar is C84400 valve metal.

Nuclear Grade (Grade R1) Hafnium UNS C84400 (Alloy 5A) Valve Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		78
Elastic (Young's, Tensile) Modulus, GPa		100

Elongation at Break, %		25
Elongation at Break, %		19

Poisson's Ratio		0.26
Poisson's Ratio		0.34

Shear Modulus, GPa		31
Shear Modulus, GPa		39

Tensile Strength: Ultimate (UTS), MPa		350
Tensile Strength: Ultimate (UTS), MPa		230

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		110

Thermal Properties

Latent Heat of Fusion, J/g		130
Latent Heat of Fusion, J/g		180

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		370

Thermal Expansion, µm/m-K		5.9
Thermal Expansion, µm/m-K		19

Otherwise Unclassified Properties

Density, g/cm³		13
Density, g/cm³		8.8

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		73
Resilience: Ultimate (Unit Rupture Work), MJ/m³		36

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		58

Stiffness to Weight: Axial, points		3.3
Stiffness to Weight: Axial, points		6.6

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		18

Strength to Weight: Axial, points		7.4
Strength to Weight: Axial, points		7.2

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		9.4

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		8.3

Alloy Composition

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Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.0050

Antimony (Sb), %		0
Antimony (Sb), %		0 to 0.25

Copper (Cu), %		0
Copper (Cu), %		78 to 82

Hafnium (Hf), %		99.8 to 100
Hafnium (Hf), %		0

Iron (Fe), %		0
Iron (Fe), %		0 to 0.4

Lead (Pb), %		0
Lead (Pb), %		6.0 to 8.0

Nickel (Ni), %		0
Nickel (Ni), %		0 to 1.0

Phosphorus (P), %		0
Phosphorus (P), %		0 to 1.5

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

Sulfur (S), %		0
Sulfur (S), %		0 to 0.080

Tin (Sn), %		0
Tin (Sn), %		2.3 to 3.5

Zinc (Zn), %		0
Zinc (Zn), %		7.0 to 10

Residuals, %		0 to 0.23
Residuals, %		0 to 0.7