Nuclear Grade Hafnium vs. SAE-AISI 94B30 Steel

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while SAE-AISI 94B30 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 94B30 steel.

Nuclear Grade (Grade R1) Hafnium SAE-AISI 94B30 (G94301) Boron 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, %		25

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		500

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		300

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		110

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		250

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		18

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		18

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		15

Alloy Composition

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Boron (B), %		0
Boron (B), %		0.00050 to 0.0030

Carbon (C), %		0
Carbon (C), %		0.28 to 0.33

Chromium (Cr), %		0
Chromium (Cr), %		0.3 to 0.5

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

Iron (Fe), %		0
Iron (Fe), %		97 to 98.1

Manganese (Mn), %		0
Manganese (Mn), %		0.75 to 1.0

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0.080 to 0.15

Nickel (Ni), %		0
Nickel (Ni), %		0.3 to 0.6

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