ASTM A227 Spring Steel vs. R30021 Cobalt
ASTM A227 spring steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 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 ASTM A227 spring steel and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 12 | |
| 9.0 |
| Fatigue Strength, MPa | 900 to 1160 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 1720 to 2220 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 1430 to 1850 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 330 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1350 |
| Melting Onset (Solidus), °C | 1410 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 52 | |
| 15 |
| Thermal Expansion, µm/m-K | 12 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 8.0 |
| Embodied Energy, MJ/kg | 19 | |
| 110 |
| Embodied Water, L/kg | 46 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 260 | |
| 57 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 61 to 79 | |
| 23 |
| Strength to Weight: Bending, points | 41 to 48 | |
| 21 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.8 |
| Thermal Shock Resistance, points | 55 to 71 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0.45 to 0.85 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 29 |
| Cobalt (Co), % | 0 | |
| 61.7 to 67.3 |
| Iron (Fe), % | 97.4 to 99.1 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0.3 to 1.3 | |
| 0 |
| Molybdenum (Mo), % | 0 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 0 | |
| 2.0 to 3.0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 |