SAE-AISI 51B60 Steel vs. R31233 Cobalt
SAE-AISI 51B60 steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 51B60 steel and the bottom bar is R31233 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 12 to 21 | |
| 17 |
| Fatigue Strength, MPa | 280 to 340 | |
| 220 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 85 |
| Tensile Strength: Ultimate (UTS), MPa | 660 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 400 to 550 | |
| 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 320 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1350 |
| Melting Onset (Solidus), °C | 1410 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 440 |
| Thermal Conductivity, W/m-K | 43 | |
| 12 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 8.4 |
| Embodied Energy, MJ/kg | 19 | |
| 110 |
| Embodied Water, L/kg | 49 | |
| 480 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 73 to 120 | |
| 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 420 to 800 | |
| 410 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 23 | |
| 33 |
| Strength to Weight: Bending, points | 22 | |
| 26 |
| Thermal Diffusivity, mm2/s | 12 | |
| 3.2 |
| Thermal Shock Resistance, points | 19 | |
| 25 |
Alloy Composition
| Boron (B), % | 0.00050 to 0.0030 | |
| 0 to 0.015 |
| Carbon (C), % | 0.56 to 0.64 | |
| 0.020 to 0.1 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 23.5 to 27.5 |
| Cobalt (Co), % | 0 | |
| 44.7 to 63.3 |
| Iron (Fe), % | 97 to 97.8 | |
| 1.0 to 5.0 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0.1 to 1.5 |
| Molybdenum (Mo), % | 0 | |
| 4.0 to 6.0 |
| Nickel (Ni), % | 0 | |
| 7.0 to 11 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.12 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.030 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0.050 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.020 |
| Tungsten (W), % | 0 | |
| 1.0 to 3.0 |