R30816 Cobalt vs. SAE-AISI 4130 Steel
R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI 4130 steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is SAE-AISI 4130 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 200 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 13 to 26 |
| Fatigue Strength, MPa | 250 | |
| 320 to 660 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 530 to 1040 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 440 to 980 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1460 |
| Melting Onset (Solidus), °C | 1460 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 43 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 1.5 |
| Embodied Energy, MJ/kg | 320 | |
| 20 |
| Embodied Water, L/kg | 440 | |
| 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 83 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 500 to 2550 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 31 | |
| 19 to 37 |
| Strength to Weight: Bending, points | 25 | |
| 19 to 29 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 12 |
| Thermal Shock Resistance, points | 28 | |
| 16 to 31 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0.28 to 0.33 |
| Chromium (Cr), % | 19 to 21 | |
| 0.8 to 1.1 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 97.3 to 98.2 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.4 to 0.6 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0.15 to 0.25 |
| Nickel (Ni), % | 19 to 21 | |
| 0 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |