EN 1.6579 Steel vs. ASTM A229 Spring Steel
Both EN 1.6579 steel and ASTM A229 spring 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 (3, in this case) are not shown.
For each property being compared, the top bar is EN 1.6579 steel and the bottom bar is ASTM A229 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 260 to 290 | |
| 490 to 550 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 14 | |
| 14 |
| Fatigue Strength, MPa | 380 to 570 | |
| 710 to 790 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 850 to 980 | |
| 1690 to 1890 |
| Tensile Strength: Yield (Proof), MPa | 600 to 910 | |
| 1100 to 1230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 400 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1410 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 39 | |
| 50 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.7 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 1.4 |
| Embodied Energy, MJ/kg | 22 | |
| 19 |
| Embodied Water, L/kg | 56 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 to 120 | |
| 200 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 950 to 2210 | |
| 3260 to 4080 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 30 to 35 | |
| 60 to 67 |
| Strength to Weight: Bending, points | 25 to 28 | |
| 40 to 43 |
| Thermal Diffusivity, mm2/s | 11 | |
| 14 |
| Thermal Shock Resistance, points | 25 to 29 | |
| 54 to 60 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.38 | |
| 0.55 to 0.85 |
| Chromium (Cr), % | 1.4 to 1.7 | |
| 0 |
| Iron (Fe), % | 94.2 to 96.1 | |
| 97.5 to 99 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.3 to 1.2 |
| Molybdenum (Mo), % | 0.15 to 0.35 | |
| 0 |
| Nickel (Ni), % | 1.4 to 1.7 | |
| 0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.6 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.050 |