SAE-AISI P21 Steel vs. ASTM A227 Spring Steel
Both SAE-AISI P21 steel and ASTM A227 spring steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI P21 steel and the bottom bar is ASTM A227 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 1130 | |
| 1720 to 2220 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1450 |
| Melting Onset (Solidus), °C | 1410 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 52 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.9 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.0 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 6.5 | |
| 1.8 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 1.4 |
| Embodied Energy, MJ/kg | 32 | |
| 19 |
| Embodied Water, L/kg | 62 | |
| 46 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 40 | |
| 61 to 79 |
| Strength to Weight: Bending, points | 31 | |
| 41 to 48 |
| Thermal Diffusivity, mm2/s | 11 | |
| 14 |
| Thermal Shock Resistance, points | 37 | |
| 55 to 71 |
Alloy Composition
| Carbon (C), % | 0.18 to 0.22 | |
| 0.45 to 0.85 |
| Chromium (Cr), % | 0 to 0.5 | |
| 0 |
| Cobalt (Co), % | 1.1 to 1.3 | |
| 0 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 92.1 to 94.2 | |
| 97.4 to 99.1 |
| Manganese (Mn), % | 0.35 to 0.72 | |
| 0.3 to 1.3 |
| Nickel (Ni), % | 3.9 to 4.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.2 to 0.4 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.050 |
| Vanadium (V), % | 0.15 to 0.25 | |
| 0 |