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