SAE-AISI 1017 Steel vs. R30155 Cobalt
Both SAE-AISI 1017 steel and R30155 cobalt are iron alloys. They have a modest 31% 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 (4, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 1017 steel and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 120 to 130 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 20 to 30 | |
| 34 |
| Fatigue Strength, MPa | 170 to 270 | |
| 310 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 46 to 56 | |
| 34 |
| Shear Modulus, GPa | 73 | |
| 81 |
| Shear Strength, MPa | 280 to 290 | |
| 570 |
| Tensile Strength: Ultimate (UTS), MPa | 420 to 460 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 220 to 390 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 53 | |
| 12 |
| Thermal Expansion, µm/m-K | 12 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 80 |
| Density, g/cm3 | 7.9 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 9.7 |
| Embodied Energy, MJ/kg | 18 | |
| 150 |
| Embodied Water, L/kg | 45 | |
| 300 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 88 to 110 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 to 400 | |
| 370 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 15 to 16 | |
| 28 |
| Strength to Weight: Bending, points | 16 to 17 | |
| 24 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.2 |
| Thermal Shock Resistance, points | 13 to 14 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0.15 to 0.2 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 0 | |
| 20 to 22.5 |
| Cobalt (Co), % | 0 | |
| 18.5 to 21 |
| Iron (Fe), % | 99.11 to 99.55 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 0 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 0.75 to 1.3 |
| Nitrogen (N), % | 0 | |
| 0 to 0.2 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 0.75 to 1.3 |
| Tungsten (W), % | 0 | |
| 2.0 to 3.0 |