Nuclear Grade Hafnium vs. AWS ER120S-1

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while AWS ER120S-1 belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is AWS ER120S-1.

Nuclear Grade (Grade R1) Hafnium AWS ER120S-1 or ER83S-1 (K21030) Weld Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		78
Elastic (Young's, Tensile) Modulus, GPa		190

Elongation at Break, %		25
Elongation at Break, %		17

Poisson's Ratio		0.26
Poisson's Ratio		0.29

Shear Modulus, GPa		31
Shear Modulus, GPa		73

Tensile Strength: Ultimate (UTS), MPa		350
Tensile Strength: Ultimate (UTS), MPa		930

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		830

Thermal Properties

Latent Heat of Fusion, J/g		130
Latent Heat of Fusion, J/g		260

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		470

Thermal Expansion, µm/m-K		5.9
Thermal Expansion, µm/m-K		13

Otherwise Unclassified Properties

Density, g/cm³		13
Density, g/cm³		7.8

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		73
Resilience: Ultimate (Unit Rupture Work), MJ/m³		150

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		1850

Stiffness to Weight: Axial, points		3.3
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		7.4
Strength to Weight: Axial, points		33

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		27

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		27

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.1

Carbon (C), %		0
Carbon (C), %		0 to 0.1

Chromium (Cr), %		0
Chromium (Cr), %		0 to 0.6

Copper (Cu), %		0
Copper (Cu), %		0 to 0.25

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

Iron (Fe), %		0
Iron (Fe), %		92.4 to 96.1

Manganese (Mn), %		0
Manganese (Mn), %		1.4 to 1.8

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0.3 to 0.65

Nickel (Ni), %		0
Nickel (Ni), %		2.0 to 2.8

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.010

Silicon (Si), %		0
Silicon (Si), %		0.25 to 0.6

Sulfur (S), %		0
Sulfur (S), %		0 to 0.010

Titanium (Ti), %		0
Titanium (Ti), %		0 to 0.1

Vanadium (V), %		0
Vanadium (V), %		0 to 0.030

Zirconium (Zr), %		0
Zirconium (Zr), %		0 to 0.1

Residuals, %		0
Residuals, %		0 to 0.5