ASTM A387 Grade 91 Class 2 vs. R31539 Cobalt
ASTM A387 grade 91 class 2 belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. 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 ASTM A387 grade 91 class 2 and the bottom bar is R31539 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 20 | |
| 13 to 22 |
| Fatigue Strength, MPa | 330 | |
| 310 to 480 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 470 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1360 |
| Melting Onset (Solidus), °C | 1420 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 26 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 8.2 |
| Embodied Energy, MJ/kg | 37 | |
| 110 |
| Embodied Water, L/kg | 88 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 140 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 580 | |
| 780 to 2000 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 24 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 22 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 3.5 |
| Thermal Shock Resistance, points | 19 | |
| 24 to 32 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.020 | |
| 0.3 to 1.0 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0 to 0.14 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 57.7 to 68.7 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 0 to 0.75 |
| Lanthanum (La), % | 0 | |
| 0.030 to 0.2 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 to 1.0 |
| Niobium (Nb), % | 0.060 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0.030 to 0.070 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Silicon (Si), % | 0.2 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Vanadium (V), % | 0.18 to 0.25 | |
| 0 |
| Zirconium (Zr), % | 0 to 0.010 | |
| 0 |