S45503 Stainless Steel vs. R31538 Cobalt
S45503 stainless steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is S45503 stainless steel and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 4.6 to 6.8 | |
| 13 to 23 |
| Fatigue Strength, MPa | 710 to 800 | |
| 310 to 480 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Reduction in Area, % | 17 to 28 | |
| 13 to 22 |
| Rockwell C Hardness | 46 to 54 | |
| 25 to 35 |
| Shear Modulus, GPa | 75 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 1610 to 1850 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 1430 to 1700 | |
| 580 to 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1360 |
| Melting Onset (Solidus), °C | 1400 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.9 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 3.4 | |
| 8.1 |
| Embodied Energy, MJ/kg | 48 | |
| 110 |
| Embodied Water, L/kg | 120 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 82 to 110 | |
| 140 to 200 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 57 to 65 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 39 to 43 | |
| 27 to 32 |
| Thermal Shock Resistance, points | 56 to 64 | |
| 25 to 33 |
Alloy Composition
| Carbon (C), % | 0 to 0.010 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 11 to 12.5 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Copper (Cu), % | 1.5 to 2.5 | |
| 0 |
| Iron (Fe), % | 72.4 to 78.9 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 to 0.5 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 7.5 to 9.5 | |
| 0 to 1.0 |
| Niobium (Nb), % | 0.1 to 0.5 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.010 | |
| 0 |
| Silicon (Si), % | 0 to 0.2 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 1.0 to 1.4 | |
| 0 |