R30605 Cobalt vs. S31727 Stainless Steel
R30605 cobalt belongs to the cobalt alloys classification, while S31727 stainless steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is R30605 cobalt and the bottom bar is S31727 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 210 | |
200 |
Elongation at Break, % | 34 | |
40 |
Fatigue Strength, MPa | 260 to 590 | |
240 |
Poisson's Ratio | 0.29 | |
0.28 |
Shear Modulus, GPa | 81 | |
78 |
Tensile Strength: Ultimate (UTS), MPa | 1130 to 1900 | |
630 |
Tensile Strength: Yield (Proof), MPa | 470 to 1600 | |
270 |
Thermal Properties
Latent Heat of Fusion, J/g | 290 | |
290 |
Melting Completion (Liquidus), °C | 1410 | |
1440 |
Melting Onset (Solidus), °C | 1330 | |
1390 |
Specific Heat Capacity, J/kg-K | 410 | |
470 |
Thermal Expansion, µm/m-K | 12 | |
16 |
Otherwise Unclassified Properties
Density, g/cm3 | 9.6 | |
8.0 |
Embodied Carbon, kg CO2/kg material | 9.8 | |
4.7 |
Embodied Energy, MJ/kg | 140 | |
64 |
Embodied Water, L/kg | 450 | |
180 |
Common Calculations
Stiffness to Weight: Axial, points | 12 | |
14 |
Stiffness to Weight: Bending, points | 21 | |
24 |
Strength to Weight: Axial, points | 33 to 55 | |
22 |
Strength to Weight: Bending, points | 25 to 36 | |
20 |
Thermal Shock Resistance, points | 31 to 52 | |
14 |
Alloy Composition
Carbon (C), % | 0.050 to 0.15 | |
0 to 0.030 |
Chromium (Cr), % | 19 to 21 | |
17.5 to 19 |
Cobalt (Co), % | 46.4 to 57 | |
0 |
Copper (Cu), % | 0 | |
2.8 to 4.0 |
Iron (Fe), % | 0 to 3.0 | |
53.7 to 61.3 |
Manganese (Mn), % | 1.0 to 2.0 | |
0 to 1.0 |
Molybdenum (Mo), % | 0 | |
3.8 to 4.5 |
Nickel (Ni), % | 9.0 to 11 | |
14.5 to 16.5 |
Nitrogen (N), % | 0 | |
0.15 to 0.21 |
Phosphorus (P), % | 0 to 0.040 | |
0 to 0.030 |
Silicon (Si), % | 0 to 0.4 | |
0 to 1.0 |
Sulfur (S), % | 0 to 0.030 | |
0 to 0.030 |
Tungsten (W), % | 14 to 16 | |
0 |