Annealed SAE-AISI A7 vs. Annealed R31538 Cobalt
Annealed SAE-AISI A7 belongs to the iron alloys classification, while annealed R31538 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is annealed SAE-AISI A7 and the bottom bar is annealed R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 800 | |
| 1020 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 320 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1360 |
| Melting Onset (Solidus), °C | 1430 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 37 | |
| 13 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.7 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 8.1 |
| Embodied Energy, MJ/kg | 200 | |
| 110 |
| Embodied Water, L/kg | 100 | |
| 530 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 29 | |
| 34 |
| Strength to Weight: Bending, points | 25 | |
| 27 |
| Thermal Diffusivity, mm2/s | 10 | |
| 3.5 |
| Thermal Shock Resistance, points | 27 | |
| 25 |
Alloy Composition
| Carbon (C), % | 2.0 to 2.9 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 5.0 to 5.8 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 81.4 to 87.7 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 to 0.8 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.9 to 1.4 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 to 0.3 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tungsten (W), % | 0.5 to 1.5 | |
| 0 |
| Vanadium (V), % | 3.9 to 5.2 | |
| 0 |