ASTM A225 Steel vs. R30816 Cobalt
ASTM A225 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt 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 ASTM A225 steel and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 to 250 | |
| 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 21 to 23 | |
| 23 |
| Fatigue Strength, MPa | 330 to 390 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Shear Modulus, GPa | 73 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 620 to 830 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 460 to 550 | |
| 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 | 52 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 20 |
| Embodied Energy, MJ/kg | 24 to 25 | |
| 320 |
| Embodied Water, L/kg | 48 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 to 170 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 580 to 820 | |
| 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 22 to 29 | |
| 31 |
| Strength to Weight: Bending, points | 21 to 25 | |
| 25 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.3 |
| Thermal Shock Resistance, points | 18 to 24 | |
| 28 |