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Nuclear Grade Hafnium vs. ACI-ASTM CB6 Steel

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while ACI-ASTM CB6 steel belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is ACI-ASTM CB6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
200
Elongation at Break, % 25
18
Poisson's Ratio 0.26
0.28
Shear Modulus, GPa 31
77
Tensile Strength: Ultimate (UTS), MPa 350
880
Tensile Strength: Yield (Proof), MPa 170
660

Thermal Properties

Latent Heat of Fusion, J/g 130
280
Specific Heat Capacity, J/kg-K 140
480
Thermal Expansion, µm/m-K 5.9
10

Otherwise Unclassified Properties

Density, g/cm3 13
7.8

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 73
150
Resilience: Unit (Modulus of Resilience), kJ/m3 180
1110
Stiffness to Weight: Axial, points 3.3
14
Stiffness to Weight: Bending, points 11
25
Strength to Weight: Axial, points 7.4
32
Strength to Weight: Bending, points 8.4
26
Thermal Shock Resistance, points 55
31

Alloy Composition

Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0
15.5 to 17.5
Hafnium (Hf), % 99.8 to 100
0
Iron (Fe), % 0
74.4 to 81
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
3.5 to 5.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Residuals, % 0 to 0.23
0