R30155 Cobalt vs. WE54A Magnesium
R30155 cobalt belongs to the iron alloys classification, while WE54A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is WE54A magnesium.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 85 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 44 |
| Elongation at Break, % | 34 | |
| 4.3 to 5.6 |
| Fatigue Strength, MPa | 310 | |
| 98 to 130 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 17 |
| Shear Strength, MPa | 570 | |
| 150 to 170 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 270 to 300 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 180 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 330 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 170 |
| Melting Completion (Liquidus), °C | 1470 | |
| 640 |
| Melting Onset (Solidus), °C | 1420 | |
| 570 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 960 |
| Thermal Conductivity, W/m-K | 12 | |
| 52 |
| Thermal Expansion, µm/m-K | 14 | |
| 25 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 34 |
| Density, g/cm3 | 8.5 | |
| 1.9 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 29 |
| Embodied Energy, MJ/kg | 150 | |
| 260 |
| Embodied Water, L/kg | 300 | |
| 900 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 10 to 14 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 360 to 380 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 62 |
| Strength to Weight: Axial, points | 28 | |
| 39 to 43 |
| Strength to Weight: Bending, points | 24 | |
| 49 to 51 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 28 |
| Thermal Shock Resistance, points | 21 | |
| 18 to 19 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.030 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 0 to 0.010 |
| Lithium (Li), % | 0 | |
| 0 to 0.2 |
| Magnesium (Mg), % | 0 | |
| 88.7 to 93.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 0.030 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.0050 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.010 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |
| Unspecified Rare Earths, % | 0 | |
| 1.5 to 4.0 |
| Yttrium (Y), % | 0 | |
| 4.8 to 5.5 |
| Zinc (Zn), % | 0 | |
| 0 to 0.2 |
| Zirconium (Zr), % | 0 | |
| 0.4 to 1.0 |
| Residuals, % | 0 | |
| 0 to 0.3 |