Nuclear Grade Hafnium vs. EN 1.7378 Steel

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while EN 1.7378 steel belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is EN 1.7378 steel.

Nuclear Grade (Grade R1) Hafnium EN 1.7378 (7CrMoVTiB10-10) Chromium-Molybdenum 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, %		17

Poisson's Ratio		0.26
Poisson's Ratio		0.29

Shear Modulus, GPa		31
Shear Modulus, GPa		74

Tensile Strength: Ultimate (UTS), MPa		350
Tensile Strength: Ultimate (UTS), MPa		700

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		490

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		110

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		630

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		25

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

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

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.020

Boron (B), %		0
Boron (B), %		0.0015 to 0.0070

Carbon (C), %		0
Carbon (C), %		0.050 to 0.1

Chromium (Cr), %		0
Chromium (Cr), %		2.2 to 2.6

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

Iron (Fe), %		0
Iron (Fe), %		94.6 to 96.1

Manganese (Mn), %		0
Manganese (Mn), %		0.3 to 0.7

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0.9 to 1.1

Nitrogen (N), %		0
Nitrogen (N), %		0 to 0.010

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

Silicon (Si), %		0
Silicon (Si), %		0.15 to 0.45

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

Titanium (Ti), %		0
Titanium (Ti), %		0.050 to 0.1

Vanadium (V), %		0
Vanadium (V), %		0.2 to 0.3

Residuals, %		0 to 0.23
Residuals, %		0