ASTM A229 Spring Steel vs. EN 1.7767 Steel
Both ASTM A229 spring steel and EN 1.7767 steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 1.7767 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 490 to 550 | |
| 200 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 20 |
| Fatigue Strength, MPa | 710 to 790 | |
| 320 to 340 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 74 |
| Shear Strength, MPa | 1020 to 1140 | |
| 420 to 430 |
| Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
| 670 to 690 |
| Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
| 460 to 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 480 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1470 |
| Melting Onset (Solidus), °C | 1410 | |
| 1430 |
| 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 | |
| 8.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 4.5 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 2.4 |
| Embodied Energy, MJ/kg | 19 | |
| 33 |
| Embodied Water, L/kg | 46 | |
| 64 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 230 | |
| 120 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3260 to 4080 | |
| 570 to 650 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 60 to 67 | |
| 24 |
| Strength to Weight: Bending, points | 40 to 43 | |
| 22 |
| Thermal Diffusivity, mm2/s | 14 | |
| 11 |
| Thermal Shock Resistance, points | 54 to 60 | |
| 19 to 20 |
Alloy Composition
| Carbon (C), % | 0.55 to 0.85 | |
| 0.1 to 0.15 |
| Chromium (Cr), % | 0 | |
| 2.8 to 3.3 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 97.5 to 99 | |
| 93.8 to 95.8 |
| Manganese (Mn), % | 0.3 to 1.2 | |
| 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 0.15 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.0050 |
| Titanium (Ti), % | 0 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 | |
| 0.2 to 0.3 |