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Nuclear Grade Hafnium vs. ASTM A372 Grade A Steel

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while ASTM A372 grade A 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 ASTM A372 grade A steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
190
Elongation at Break, % 25
22
Poisson's Ratio 0.26
0.29
Shear Modulus, GPa 31
73
Tensile Strength: Ultimate (UTS), MPa 350
500
Tensile Strength: Yield (Proof), MPa 170
270

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
95
Resilience: Unit (Modulus of Resilience), kJ/m3 180
200
Stiffness to Weight: Axial, points 3.3
13
Stiffness to Weight: Bending, points 11
24
Strength to Weight: Axial, points 7.4
18
Strength to Weight: Bending, points 8.4
18
Thermal Shock Resistance, points 55
16

Alloy Composition

Carbon (C), % 0
0 to 0.3
Hafnium (Hf), % 99.8 to 100
0
Iron (Fe), % 0
98.3 to 99.85
Manganese (Mn), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.010
Residuals, % 0 to 0.23
0