ASTM A231 Spring Steel vs. EN 1.7703 Steel
Both ASTM A231 spring steel and EN 1.7703 steel are iron alloys. They have a very high 97% of their average alloy composition in common. 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 ASTM A231 spring steel and the bottom bar is EN 1.7703 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 540 | |
| 200 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 20 |
| Fatigue Strength, MPa | 1000 | |
| 320 to 340 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 74 |
| Shear Strength, MPa | 1080 | |
| 420 to 430 |
| Tensile Strength: Ultimate (UTS), MPa | 1790 | |
| 670 to 690 |
| Tensile Strength: Yield (Proof), MPa | 1570 | |
| 460 to 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 460 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1470 |
| Melting Onset (Solidus), °C | 1410 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 52 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.3 | |
| 4.2 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.0 | |
| 2.5 |
| Embodied Energy, MJ/kg | 28 | |
| 35 |
| Embodied Water, L/kg | 51 | |
| 61 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 120 to 130 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 64 | |
| 24 |
| Strength to Weight: Bending, points | 42 | |
| 22 |
| Thermal Diffusivity, mm2/s | 14 | |
| 11 |
| Thermal Shock Resistance, points | 53 | |
| 19 to 20 |
Alloy Composition
| Carbon (C), % | 0.48 to 0.53 | |
| 0.11 to 0.15 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 2.0 to 2.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.2 |
| Iron (Fe), % | 96.7 to 97.7 | |
| 94.6 to 96.4 |
| Manganese (Mn), % | 0.7 to 0.9 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 0 | |
| 0 to 0.25 |
| Niobium (Nb), % | 0 | |
| 0 to 0.070 |
| Nitrogen (N), % | 0 | |
| 0 to 0.012 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.015 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.0050 |
| Titanium (Ti), % | 0 | |
| 0 to 0.030 |
| Vanadium (V), % | 0.15 to 0.3 | |
| 0.25 to 0.35 |