R30008 Cobalt vs. S21904 Stainless Steel
R30008 cobalt belongs to the cobalt alloys classification, while S21904 stainless steel belongs to the iron alloys. They have 42% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is R30008 cobalt and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 210 | |
200 |
Elongation at Break, % | 1.1 to 73 | |
17 to 51 |
Fatigue Strength, MPa | 320 to 530 | |
380 to 550 |
Poisson's Ratio | 0.29 | |
0.28 |
Shear Modulus, GPa | 83 | |
78 |
Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
700 to 1000 |
Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
390 to 910 |
Thermal Properties
Latent Heat of Fusion, J/g | 320 | |
290 |
Melting Completion (Liquidus), °C | 1400 | |
1400 |
Melting Onset (Solidus), °C | 1330 | |
1350 |
Specific Heat Capacity, J/kg-K | 450 | |
480 |
Thermal Expansion, µm/m-K | 13 | |
17 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 95 | |
15 |
Density, g/cm3 | 8.4 | |
7.7 |
Embodied Carbon, kg CO2/kg material | 8.1 | |
3.0 |
Embodied Energy, MJ/kg | 110 | |
43 |
Embodied Water, L/kg | 400 | |
160 |
Common Calculations
Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
380 to 2070 |
Stiffness to Weight: Axial, points | 14 | |
14 |
Stiffness to Weight: Bending, points | 24 | |
25 |
Strength to Weight: Axial, points | 31 to 56 | |
25 to 36 |
Strength to Weight: Bending, points | 25 to 37 | |
23 to 29 |
Thermal Shock Resistance, points | 25 to 44 | |
15 to 21 |
Alloy Composition
Boron (B), % | 0 to 0.0010 | |
0 |
Carbon (C), % | 0 to 0.15 | |
0 to 0.040 |
Chromium (Cr), % | 18.5 to 21.5 | |
19 to 21.5 |
Cobalt (Co), % | 39 to 42 | |
0 |
Iron (Fe), % | 7.6 to 20 | |
59.5 to 67.4 |
Manganese (Mn), % | 1.0 to 2.0 | |
8.0 to 10 |
Molybdenum (Mo), % | 6.5 to 7.5 | |
0 |
Nickel (Ni), % | 15 to 18 | |
5.5 to 7.5 |
Nitrogen (N), % | 0 | |
0.15 to 0.4 |
Phosphorus (P), % | 0 to 0.015 | |
0 to 0.045 |
Silicon (Si), % | 0 to 1.2 | |
0 to 1.0 |
Sulfur (S), % | 0 to 0.015 | |
0 to 0.030 |