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Nuclear Grade Hafnium vs. Grade 250 Maraging Steel

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while grade 250 maraging steel belongs to the iron alloys. There are 16 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is grade 250 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
190
Elongation at Break, % 25
7.3 to 17
Poisson's Ratio 0.26
0.3
Shear Modulus, GPa 31
75
Tensile Strength: Ultimate (UTS), MPa 350
970 to 1800
Tensile Strength: Yield (Proof), MPa 170
660 to 1740

Thermal Properties

Latent Heat of Fusion, J/g 130
270
Specific Heat Capacity, J/kg-K 140
450
Thermal Expansion, µm/m-K 5.9
12

Otherwise Unclassified Properties

Density, g/cm3 13
8.2

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 73
130 to 150
Stiffness to Weight: Axial, points 3.3
13
Stiffness to Weight: Bending, points 11
23
Strength to Weight: Axial, points 7.4
33 to 61
Strength to Weight: Bending, points 8.4
26 to 40
Thermal Shock Resistance, points 55
29 to 54

Alloy Composition

Aluminum (Al), % 0
0.050 to 0.15
Boron (B), % 0
0 to 0.0030
Calcium (Ca), % 0
0 to 0.050
Carbon (C), % 0
0 to 0.030
Cobalt (Co), % 0
7.0 to 8.5
Hafnium (Hf), % 99.8 to 100
0
Iron (Fe), % 0
66.3 to 71.1
Manganese (Mn), % 0
0 to 0.1
Molybdenum (Mo), % 0
4.6 to 5.2
Nickel (Ni), % 0
17 to 19
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0
0 to 0.1
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0.3 to 0.5
Zirconium (Zr), % 0
0 to 0.020
Residuals, % 0 to 0.23
0