SAE-AISI D2 Steel vs. R30816 Cobalt
SAE-AISI D2 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI D2 steel and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 5.0 to 16 | |
| 23 |
| Fatigue Strength, MPa | 310 to 860 | |
| 250 |
| Poisson's Ratio | 0.28 | |
| 0.3 |
| Shear Modulus, GPa | 75 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 760 to 2000 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1510 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 300 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1540 |
| Melting Onset (Solidus), °C | 1390 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 420 |
| Thermal Conductivity, W/m-K | 31 | |
| 13 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.7 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 3.4 | |
| 20 |
| Embodied Energy, MJ/kg | 50 | |
| 320 |
| Embodied Water, L/kg | 100 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 92 to 100 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 to 5940 | |
| 510 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 22 |
| Strength to Weight: Axial, points | 27 to 72 | |
| 31 |
| Strength to Weight: Bending, points | 24 to 46 | |
| 25 |
| Thermal Diffusivity, mm2/s | 8.3 | |
| 3.3 |
| Thermal Shock Resistance, points | 25 to 67 | |
| 28 |
Alloy Composition
| Carbon (C), % | 1.4 to 1.6 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 11 to 13 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 81.3 to 86.9 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 to 0.6 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0.7 to 1.2 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 to 0.3 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |
| Vanadium (V), % | 0 to 1.1 | |
| 0 |