Annealed AISI 304LN vs. Annealed R30035 Cobalt
Annealed AISI 304LN belongs to the iron alloys classification, while annealed 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 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is annealed AISI 304LN and the bottom bar is annealed R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 42 | |
| 46 |
| Fatigue Strength, MPa | 200 | |
| 170 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Reduction in Area, % | 51 | |
| 74 |
| Rockwell B Hardness | 83 | |
| 99 |
| Shear Modulus, GPa | 77 | |
| 84 |
| Tensile Strength: Ultimate (UTS), MPa | 580 | |
| 900 |
| Tensile Strength: Yield (Proof), MPa | 230 | |
| 300 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1440 |
| Melting Onset (Solidus), °C | 1380 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 440 |
| Thermal Conductivity, W/m-K | 15 | |
| 11 |
| Thermal Expansion, µm/m-K | 16 | |
| 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 | 3.1 | |
| 10 |
| Embodied Energy, MJ/kg | 44 | |
| 140 |
| Embodied Water, L/kg | 150 | |
| 410 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 320 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 | |
| 210 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 21 | |
| 29 |
| Strength to Weight: Bending, points | 20 | |
| 24 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 3.0 |
| Thermal Shock Resistance, points | 13 | |
| 23 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.030 | |
| 0 to 0.025 |
| Chromium (Cr), % | 18 to 20 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Iron (Fe), % | 65 to 73.9 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 8.0 to 12 | |
| 33 to 37 |
| Nitrogen (N), % | 0.1 to 0.16 | |
| 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 | |
| 0 to 1.0 |