Nuclear Grade Hafnium vs. SAE-AISI 4340 Steel

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while SAE-AISI 4340 steel belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is SAE-AISI 4340 steel.

Nuclear Grade (Grade R1) Hafnium SAE-AISI 4340 (SNCM439, G43400) Ni-Cr-Mo Steel

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, %		12 to 22

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		690 to 1280

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g		130
Latent Heat of Fusion, J/g		250

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		79 to 170

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		590 to 3490

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		24 to 45

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		22 to 33

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		20 to 38

Alloy Composition

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Carbon (C), %		0
Carbon (C), %		0.38 to 0.43

Chromium (Cr), %		0
Chromium (Cr), %		0.7 to 0.9

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

Iron (Fe), %		0
Iron (Fe), %		95.1 to 96.3

Manganese (Mn), %		0
Manganese (Mn), %		0.6 to 0.8

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0.2 to 0.3

Nickel (Ni), %		0
Nickel (Ni), %		1.7 to 2.0

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.035

Silicon (Si), %		0
Silicon (Si), %		0.15 to 0.35

Sulfur (S), %		0
Sulfur (S), %		0 to 0.040

Residuals, %		0 to 0.23
Residuals, %		0