ACI-ASTM CB7Cu-2 Steel vs. R30008 Cobalt
ACI-ASTM CB7Cu-2 steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is ACI-ASTM CB7Cu-2 steel and the bottom bar is R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 5.7 to 11 | |
| 1.1 to 73 |
| Fatigue Strength, MPa | 420 to 590 | |
| 320 to 530 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 960 to 1350 | |
| 950 to 1700 |
| Tensile Strength: Yield (Proof), MPa | 760 to 1180 | |
| 500 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 320 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1400 |
| Melting Onset (Solidus), °C | 1380 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 13 | |
| 95 |
| Density, g/cm3 | 7.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 8.1 |
| Embodied Energy, MJ/kg | 38 | |
| 110 |
| Embodied Water, L/kg | 130 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1510 to 3600 | |
| 590 to 2720 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 34 to 48 | |
| 31 to 56 |
| Strength to Weight: Bending, points | 28 to 35 | |
| 25 to 37 |
| Thermal Shock Resistance, points | 32 to 45 | |
| 25 to 44 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.0010 |
| Carbon (C), % | 0 to 0.070 | |
| 0 to 0.15 |
| Chromium (Cr), % | 14 to 15.5 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 0 | |
| 39 to 42 |
| Copper (Cu), % | 2.5 to 3.2 | |
| 0 |
| Iron (Fe), % | 73.6 to 79 | |
| 7.6 to 20 |
| Manganese (Mn), % | 0 to 0.7 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 4.5 to 5.5 | |
| 15 to 18 |
| Niobium (Nb), % | 0 to 0.35 | |
| 0 |
| Nitrogen (N), % | 0 to 0.050 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |