R30155 Cobalt vs. AISI 204 Stainless Steel
Both R30155 cobalt and AISI 204 stainless steel are iron alloys. They have 51% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is AISI 204 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 210 to 330 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 34 | |
| 23 to 39 |
| Fatigue Strength, MPa | 310 | |
| 320 to 720 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Shear Strength, MPa | 570 | |
| 500 to 700 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 730 to 1100 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 380 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 570 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 850 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1410 |
| Melting Onset (Solidus), °C | 1420 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 12 | |
| 15 |
| Thermal Expansion, µm/m-K | 14 | |
| 17 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 10 |
| Density, g/cm3 | 8.5 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 2.4 |
| Embodied Energy, MJ/kg | 150 | |
| 35 |
| Embodied Water, L/kg | 300 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 20 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 240 to 250 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 360 to 2940 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 27 to 40 |
| Strength to Weight: Bending, points | 24 | |
| 24 to 31 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 4.1 |
| Thermal Shock Resistance, points | 21 | |
| 16 to 24 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.030 |
| Chromium (Cr), % | 20 to 22.5 | |
| 15 to 17 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 69.6 to 76.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 7.0 to 9.0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 1.5 to 3.0 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0.15 to 0.3 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |