Nuclear Grade Hafnium vs. AWS E90C-B9

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while AWS E90C-B9 belongs to the iron 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 AWS E90C-B9.

Nuclear Grade (Grade R1) Hafnium AWS E90C-B9 or E55C-B9 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, %		18

Poisson's Ratio		0.26
Poisson's Ratio		0.28

Shear Modulus, GPa		31
Shear Modulus, GPa		75

Tensile Strength: Ultimate (UTS), MPa		350
Tensile Strength: Ultimate (UTS), MPa		710

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		460

Thermal Properties

Latent Heat of Fusion, J/g		130
Latent Heat of Fusion, J/g		270

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		110

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		550

Stiffness to Weight: Axial, points		3.3
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		25

Strength to Weight: Axial, points		7.4
Strength to Weight: Axial, points		25

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		23

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		20

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.040

Carbon (C), %		0
Carbon (C), %		0.080 to 0.13

Chromium (Cr), %		0
Chromium (Cr), %		8.0 to 10.5

Copper (Cu), %		0
Copper (Cu), %		0 to 0.2

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

Iron (Fe), %		0
Iron (Fe), %		84.4 to 90.9

Manganese (Mn), %		0
Manganese (Mn), %		0 to 1.2

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0.85 to 1.2

Nickel (Ni), %		0
Nickel (Ni), %		0 to 0.8

Niobium (Nb), %		0
Niobium (Nb), %		0.020 to 0.1

Nitrogen (N), %		0
Nitrogen (N), %		0.030 to 0.070

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.020

Silicon (Si), %		0
Silicon (Si), %		0 to 0.5

Sulfur (S), %		0
Sulfur (S), %		0 to 0.015

Vanadium (V), %		0
Vanadium (V), %		0.15 to 0.3

Residuals, %		0
Residuals, %		0 to 0.5