ASTM A229 Spring Steel vs. EN 1.6570 Steel
Both ASTM A229 spring steel and EN 1.6570 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is EN 1.6570 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 490 to 550 | |
| 270 to 340 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 11 to 17 |
| Fatigue Strength, MPa | 710 to 790 | |
| 500 to 660 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
| 910 to 1130 |
| Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
| 760 to 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 440 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 50 | |
| 40 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 3.9 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.7 |
| Embodied Energy, MJ/kg | 19 | |
| 23 |
| Embodied Water, L/kg | 46 | |
| 56 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 230 | |
| 120 to 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3260 to 4080 | |
| 1520 to 3010 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 60 to 67 | |
| 32 to 40 |
| Strength to Weight: Bending, points | 40 to 43 | |
| 27 to 31 |
| Thermal Diffusivity, mm2/s | 14 | |
| 11 |
| Thermal Shock Resistance, points | 54 to 60 | |
| 27 to 33 |
Alloy Composition
| Carbon (C), % | 0.55 to 0.85 | |
| 0.28 to 0.35 |
| Chromium (Cr), % | 0 | |
| 1.0 to 1.4 |
| Iron (Fe), % | 97.5 to 99 | |
| 94 to 96.2 |
| Manganese (Mn), % | 0.3 to 1.2 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 0.3 to 0.5 |
| Nickel (Ni), % | 0 | |
| 1.6 to 2.1 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.020 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.015 |