Nuclear Grade Hafnium vs. ASTM A229 Spring Steel
Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while ASTM A229 spring 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 A229 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 78 | |
| 190 |
| Elongation at Break, % | 25 | |
| 14 |
| Poisson's Ratio | 0.26 | |
| 0.29 |
| Shear Modulus, GPa | 31 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 350 | |
| 1690 to 1890 |
| Tensile Strength: Yield (Proof), MPa | 170 | |
| 1100 to 1230 |
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 | |
| 200 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 | |
| 3260 to 4080 |
| Stiffness to Weight: Axial, points | 3.3 | |
| 13 |
| Stiffness to Weight: Bending, points | 11 | |
| 24 |
| Strength to Weight: Axial, points | 7.4 | |
| 60 to 67 |
| Strength to Weight: Bending, points | 8.4 | |
| 40 to 43 |
| Thermal Shock Resistance, points | 55 | |
| 54 to 60 |
Alloy Composition
| Carbon (C), % | 0 | |
| 0.55 to 0.85 |
| Hafnium (Hf), % | 99.8 to 100 | |
| 0 |
| Iron (Fe), % | 0 | |
| 97.5 to 99 |
| Manganese (Mn), % | 0 | |
| 0.3 to 1.2 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 | |
| 0 to 0.050 |
| Residuals, % | 0 to 0.23 | |
| 0 |