SAE-AISI 1039 Steel vs. R30816 Cobalt
SAE-AISI 1039 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. 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 SAE-AISI 1039 steel and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 to 200 | |
| 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 14 to 18 | |
| 23 |
| Fatigue Strength, MPa | 230 to 370 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Reduction in Area, % | 40 to 45 | |
| 22 |
| Shear Modulus, GPa | 73 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 610 to 690 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 340 to 580 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 300 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1540 |
| Melting Onset (Solidus), °C | 1420 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 420 |
| Thermal Conductivity, W/m-K | 51 | |
| 13 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 20 |
| Embodied Energy, MJ/kg | 18 | |
| 320 |
| Embodied Water, L/kg | 46 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 88 to 94 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 310 to 890 | |
| 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 22 to 24 | |
| 31 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 25 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.3 |
| Thermal Shock Resistance, points | 19 to 22 | |
| 28 |
Alloy Composition
| Carbon (C), % | 0.37 to 0.44 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Iron (Fe), % | 98.5 to 98.9 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0.7 to 1.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |