Class 4 Tungsten vs. Class 3 Tungsten
Both class 4 tungsten and class 3 tungsten are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is class 4 tungsten and the bottom bar is class 3 tungsten.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 270 | |
| 270 |
| Elongation at Break, % | 2.3 | |
| 3.4 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Rockwell C Hardness | 31 | |
| 30 |
| Shear Modulus, GPa | 110 | |
| 100 |
| Tensile Strength: Ultimate (UTS), MPa | 790 | |
| 830 |
| Tensile Strength: Yield (Proof), MPa | 580 | |
| 580 |
Thermal Properties
| Latent Heat of Fusion, J/g | 170 | |
| 170 |
| Specific Heat Capacity, J/kg-K | 130 | |
| 120 |
| Thermal Conductivity, W/m-K | 30 | |
| 30 |
| Thermal Expansion, µm/m-K | 4.5 | |
| 4.5 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 17 | |
| 15 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.7 | |
| 8.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 16 | |
| 15 |
| Embodied Carbon, kg CO2/kg material | 24 | |
| 23 |
| Embodied Energy, MJ/kg | 360 | |
| 360 |
| Embodied Water, L/kg | 150 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 16 | |
| 25 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 620 | |
| 630 |
| Stiffness to Weight: Axial, points | 9.6 | |
| 9.6 |
| Stiffness to Weight: Bending, points | 14 | |
| 14 |
| Strength to Weight: Axial, points | 14 | |
| 15 |
| Strength to Weight: Bending, points | 12 | |
| 13 |
| Thermal Diffusivity, mm2/s | 15 | |
| 15 |
| Thermal Shock Resistance, points | 46 | |
| 49 |
Alloy Composition
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| Tungsten (W), % | 97 | |
| 95 |
| Residuals, % | 3.0 | |
| 5.0 |