Annealed R30003 Cobalt vs. ASTM A387 Grade 21 Class 1
Annealed R30003 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 21 class 1 belongs to the iron alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is annealed R30003 cobalt and the bottom bar is ASTM A387 grade 21 class 1.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 73 | |
| 21 |
| Fatigue Strength, MPa | 320 | |
| 160 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 83 | |
| 74 |
| Tensile Strength: Ultimate (UTS), MPa | 970 | |
| 500 |
| Tensile Strength: Yield (Proof), MPa | 510 | |
| 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 260 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1470 |
| Melting Onset (Solidus), °C | 1440 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 41 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 4.1 |
| Density, g/cm3 | 8.4 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 1.8 |
| Embodied Energy, MJ/kg | 110 | |
| 23 |
| Embodied Water, L/kg | 400 | |
| 62 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 600 | |
| 140 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 32 | |
| 18 |
| Strength to Weight: Bending, points | 26 | |
| 18 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 11 |
| Thermal Shock Resistance, points | 26 | |
| 14 |
Alloy Composition
| Boron (B), % | 0 to 0.1 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 19 to 21 | |
| 2.8 to 3.3 |
| Cobalt (Co), % | 39 to 41 | |
| 0 |
| Iron (Fe), % | 10 to 20.5 | |
| 94.4 to 96 |
| Manganese (Mn), % | 1.5 to 2.5 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 6.0 to 8.0 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 14 to 16 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.025 |