R30075 Cobalt vs. EN 1.4938 Stainless Steel
R30075 cobalt belongs to the cobalt alloys classification, while EN 1.4938 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is R30075 cobalt and the bottom bar is EN 1.4938 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 200 |
| Elongation at Break, % | 12 | |
| 16 to 17 |
| Fatigue Strength, MPa | 250 to 840 | |
| 390 to 520 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 82 to 98 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 870 to 1030 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 640 to 870 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 270 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1460 |
| Melting Onset (Solidus), °C | 1290 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 30 |
| Thermal Expansion, µm/m-K | 12 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 3.3 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 3.3 |
| Embodied Energy, MJ/kg | 110 | |
| 47 |
| Embodied Water, L/kg | 530 | |
| 110 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 140 | |
| 140 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 1050 to 1920 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 25 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 31 to 37 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 26 to 29 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 8.1 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 30 to 35 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.1 | |
| 0 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0.080 to 0.15 |
| Chromium (Cr), % | 27 to 30 | |
| 11 to 12.5 |
| Cobalt (Co), % | 58.7 to 68 | |
| 0 |
| Iron (Fe), % | 0 to 0.75 | |
| 80.5 to 84.8 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.4 to 0.9 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 1.5 to 2.0 |
| Nickel (Ni), % | 0 to 0.5 | |
| 2.0 to 3.0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0.020 to 0.040 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 |
| Tungsten (W), % | 0 to 0.2 | |
| 0 |
| Vanadium (V), % | 0 | |
| 0.25 to 0.4 |