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Nuclear Grade Hafnium vs. ASTM A369 Grade FPA

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while ASTM A369 grade FPA 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 ASTM A369 grade FPA.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
190
Elongation at Break, % 25
27
Poisson's Ratio 0.26
0.29
Shear Modulus, GPa 31
73
Tensile Strength: Ultimate (UTS), MPa 350
380
Tensile Strength: Yield (Proof), MPa 170
240

Thermal Properties

Latent Heat of Fusion, J/g 130
250
Specific Heat Capacity, J/kg-K 140
470
Thermal Expansion, µm/m-K 5.9
12

Otherwise Unclassified Properties

Density, g/cm3 13
7.8

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 73
89
Resilience: Unit (Modulus of Resilience), kJ/m3 180
150
Stiffness to Weight: Axial, points 3.3
13
Stiffness to Weight: Bending, points 11
24
Strength to Weight: Axial, points 7.4
13
Strength to Weight: Bending, points 8.4
15
Thermal Shock Resistance, points 55
12

Alloy Composition

Carbon (C), % 0
0 to 0.25
Hafnium (Hf), % 99.8 to 100
0
Iron (Fe), % 0
98.3 to 99.63
Manganese (Mn), % 0
0.27 to 0.93
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0.1 to 0.5
Sulfur (S), % 0
0 to 0.035
Residuals, % 0 to 0.23
0