EN 1.6570 Steel vs. SAE-AISI 4340 Steel
Both EN 1.6570 steel and SAE-AISI 4340 steel are iron alloys. Their average alloy composition is basically identical. 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 1.6570 steel and the bottom bar is SAE-AISI 4340 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 270 to 340 | |
| 210 to 360 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 17 | |
| 12 to 22 |
| Fatigue Strength, MPa | 500 to 660 | |
| 330 to 740 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 910 to 1130 | |
| 690 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 760 to 1060 | |
| 470 to 1150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 430 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 40 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
| 7.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 3.5 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 1.7 |
| Embodied Energy, MJ/kg | 23 | |
| 22 |
| Embodied Water, L/kg | 56 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 to 140 | |
| 79 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1520 to 3010 | |
| 590 to 3490 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 32 to 40 | |
| 24 to 45 |
| Strength to Weight: Bending, points | 27 to 31 | |
| 22 to 33 |
| Thermal Diffusivity, mm2/s | 11 | |
| 12 |
| Thermal Shock Resistance, points | 27 to 33 | |
| 20 to 38 |
Alloy Composition
| Carbon (C), % | 0.28 to 0.35 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 1.0 to 1.4 | |
| 0.7 to 0.9 |
| Iron (Fe), % | 94 to 96.2 | |
| 95.1 to 96.3 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.6 to 0.8 |
| Molybdenum (Mo), % | 0.3 to 0.5 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 1.6 to 2.1 | |
| 1.7 to 2.0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.6 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.040 |