Hot Finished AISI 321 vs. Hot Forged R30035 Cobalt
Hot finished AISI 321 belongs to the iron alloys classification, while hot forged R30035 cobalt belongs to the cobalt alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 hot finished AISI 321 and the bottom bar is hot forged R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 230 |
| Fatigue Strength, MPa | 220 | |
| 500 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 89 |
| Tensile Strength: Ultimate (UTS), MPa | 590 | |
| 1200 |
| Tensile Strength: Yield (Proof), MPa | 220 | |
| 980 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1440 |
| Melting Onset (Solidus), °C | 1400 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 440 |
| Thermal Conductivity, W/m-K | 16 | |
| 11 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 1.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 16 | |
| 100 |
| Density, g/cm3 | 7.8 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 3.2 | |
| 10 |
| Embodied Energy, MJ/kg | 45 | |
| 140 |
| Embodied Water, L/kg | 140 | |
| 410 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 | |
| 2090 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 21 | |
| 39 |
| Strength to Weight: Bending, points | 20 | |
| 29 |
| Thermal Diffusivity, mm2/s | 4.1 | |
| 3.0 |
| Thermal Shock Resistance, points | 13 | |
| 29 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.025 |
| Chromium (Cr), % | 17 to 19 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Iron (Fe), % | 65.3 to 74 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 9.0 to 12 | |
| 33 to 37 |
| Nitrogen (N), % | 0 to 0.1 | |
| 0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 to 0.7 | |
| 0 to 1.0 |