EN 1.7701 Steel vs. ASTM A227 Spring Steel
Both EN 1.7701 steel and ASTM A227 spring steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is EN 1.7701 steel and the bottom bar is ASTM A227 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 480 | |
| 500 to 640 |
| 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 | 670 to 2010 | |
| 1720 to 2220 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 400 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 44 | |
| 52 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 1.4 |
| Embodied Energy, MJ/kg | 26 | |
| 19 |
| Embodied Water, L/kg | 52 | |
| 46 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 24 to 71 | |
| 61 to 79 |
| Strength to Weight: Bending, points | 22 to 45 | |
| 41 to 48 |
| Thermal Diffusivity, mm2/s | 12 | |
| 14 |
| Thermal Shock Resistance, points | 20 to 59 | |
| 55 to 71 |
Alloy Composition
| Carbon (C), % | 0.48 to 0.56 | |
| 0.45 to 0.85 |
| Chromium (Cr), % | 0.9 to 1.2 | |
| 0 |
| Iron (Fe), % | 96.2 to 97.7 | |
| 97.4 to 99.1 |
| Manganese (Mn), % | 0.7 to 1.1 | |
| 0.3 to 1.3 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.4 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.050 |
| Vanadium (V), % | 0.1 to 0.2 | |
| 0 |