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Nuclear Grade Hafnium vs. S31277 Stainless Steel

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while S31277 stainless steel belongs to the iron alloys. There are 17 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 S31277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
210
Elongation at Break, % 25
45
Poisson's Ratio 0.26
0.28
Shear Modulus, GPa 31
80
Tensile Strength: Ultimate (UTS), MPa 350
860
Tensile Strength: Yield (Proof), MPa 170
410

Thermal Properties

Latent Heat of Fusion, J/g 130
310
Specific Heat Capacity, J/kg-K 140
460
Thermal Expansion, µm/m-K 5.9
16

Otherwise Unclassified Properties

Density, g/cm3 13
8.1

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 73
320
Resilience: Unit (Modulus of Resilience), kJ/m3 180
410
Stiffness to Weight: Axial, points 3.3
14
Stiffness to Weight: Bending, points 11
24
Strength to Weight: Axial, points 7.4
29
Strength to Weight: Bending, points 8.4
25
Thermal Shock Resistance, points 55
19

Alloy Composition

Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0
20.5 to 23
Copper (Cu), % 0
0.5 to 1.5
Hafnium (Hf), % 99.8 to 100
0
Iron (Fe), % 0
35.5 to 46.2
Manganese (Mn), % 0
0 to 3.0
Molybdenum (Mo), % 0
6.5 to 8.0
Nickel (Ni), % 0
26 to 28
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Residuals, % 0 to 0.23
0