EN 1.4818 Stainless Steel vs. R30021 Cobalt
EN 1.4818 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is EN 1.4818 stainless steel and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 200 | |
220 |
Elongation at Break, % | 40 | |
9.0 |
Fatigue Strength, MPa | 280 | |
250 |
Poisson's Ratio | 0.28 | |
0.29 |
Shear Modulus, GPa | 77 | |
86 |
Tensile Strength: Ultimate (UTS), MPa | 700 | |
700 |
Tensile Strength: Yield (Proof), MPa | 330 | |
500 |
Thermal Properties
Latent Heat of Fusion, J/g | 300 | |
330 |
Melting Completion (Liquidus), °C | 1410 | |
1350 |
Melting Onset (Solidus), °C | 1370 | |
1190 |
Specific Heat Capacity, J/kg-K | 490 | |
450 |
Thermal Conductivity, W/m-K | 17 | |
15 |
Thermal Expansion, µm/m-K | 17 | |
11 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
1.9 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 2.4 | |
2.1 |
Otherwise Unclassified Properties
Density, g/cm3 | 7.7 | |
8.4 |
Embodied Carbon, kg CO2/kg material | 3.1 | |
8.0 |
Embodied Energy, MJ/kg | 44 | |
110 |
Embodied Water, L/kg | 150 | |
520 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
57 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 270 | |
570 |
Stiffness to Weight: Axial, points | 14 | |
15 |
Stiffness to Weight: Bending, points | 25 | |
24 |
Strength to Weight: Axial, points | 25 | |
23 |
Strength to Weight: Bending, points | 23 | |
21 |
Thermal Diffusivity, mm2/s | 4.5 | |
3.8 |
Thermal Shock Resistance, points | 15 | |
21 |
Alloy Composition
Carbon (C), % | 0.040 to 0.080 | |
0.2 to 0.35 |
Cerium (Ce), % | 0.030 to 0.080 | |
0 |
Chromium (Cr), % | 18 to 20 | |
26 to 29 |
Cobalt (Co), % | 0 | |
61.7 to 67.3 |
Iron (Fe), % | 65.6 to 71.8 | |
0 to 3.0 |
Manganese (Mn), % | 0 to 1.0 | |
0 |
Molybdenum (Mo), % | 0 | |
4.5 to 6.0 |
Nickel (Ni), % | 9.0 to 11 | |
2.0 to 3.0 |
Nitrogen (N), % | 0.12 to 0.2 | |
0 |
Phosphorus (P), % | 0 to 0.045 | |
0 |
Silicon (Si), % | 1.0 to 2.0 | |
0 to 1.5 |
Sulfur (S), % | 0 to 0.015 | |
0 |