R30003 Cobalt vs. AISI 302 Stainless Steel
R30003 cobalt belongs to the cobalt alloys classification, while AISI 302 stainless steel belongs to the iron alloys. They have 44% of their average alloy composition in common. There are 27 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 R30003 cobalt and the bottom bar is AISI 302 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 10 to 73 | |
| 4.5 to 46 |
| Fatigue Strength, MPa | 320 to 560 | |
| 210 to 520 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 83 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 970 to 1720 | |
| 580 to 1430 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1090 | |
| 230 to 1100 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 280 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1420 |
| Melting Onset (Solidus), °C | 1440 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 16 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 15 |
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 3.0 |
| Embodied Energy, MJ/kg | 110 | |
| 42 |
| Embodied Water, L/kg | 400 | |
| 140 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 600 to 2790 | |
| 140 to 3070 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 32 to 57 | |
| 21 to 51 |
| Strength to Weight: Bending, points | 26 to 38 | |
| 20 to 36 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 4.4 |
| Thermal Shock Resistance, points | 26 to 45 | |
| 12 to 31 |
Alloy Composition
| Boron (B), % | 0 to 0.1 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0 to 0.15 |
| Chromium (Cr), % | 19 to 21 | |
| 17 to 19 |
| Cobalt (Co), % | 39 to 41 | |
| 0 |
| Iron (Fe), % | 10 to 20.5 | |
| 67.9 to 75 |
| Manganese (Mn), % | 1.5 to 2.5 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 6.0 to 8.0 | |
| 0 |
| Nickel (Ni), % | 14 to 16 | |
| 8.0 to 10 |
| Nitrogen (N), % | 0 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |