ASTM A229 Spring Steel vs. R30003 Cobalt
ASTM A229 spring steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. There are 27 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 ASTM A229 spring steel and the bottom bar is R30003 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 14 | |
| 10 to 73 |
| Fatigue Strength, MPa | 710 to 790 | |
| 320 to 560 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
| 970 to 1720 |
| Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
| 510 to 1090 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 310 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1400 |
| Melting Onset (Solidus), °C | 1410 | |
| 1440 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 50 | |
| 13 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 2.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 95 |
| 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 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3260 to 4080 | |
| 600 to 2790 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 60 to 67 | |
| 32 to 57 |
| Strength to Weight: Bending, points | 40 to 43 | |
| 26 to 38 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.3 |
| Thermal Shock Resistance, points | 54 to 60 | |
| 26 to 45 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.1 |
| Carbon (C), % | 0.55 to 0.85 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 39 to 41 |
| Iron (Fe), % | 97.5 to 99 | |
| 10 to 20.5 |
| Manganese (Mn), % | 0.3 to 1.2 | |
| 1.5 to 2.5 |
| Molybdenum (Mo), % | 0 | |
| 6.0 to 8.0 |
| Nickel (Ni), % | 0 | |
| 14 to 16 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.015 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.015 |