SAE-AISI 4340M Steel vs. EN 1.6771 Steel
Both SAE-AISI 4340M steel and EN 1.6771 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 32 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 4340M steel and the bottom bar is EN 1.6771 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 710 | |
| 280 to 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 6.0 | |
| 8.0 to 8.7 |
| Fatigue Strength, MPa | 690 | |
| 440 to 680 |
| Impact Strength: V-Notched Charpy, J | 18 | |
| 20 to 32 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 930 to 1180 |
| Tensile Strength: Yield (Proof), MPa | 1240 | |
| 740 to 1140 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 440 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1460 |
| Melting Onset (Solidus), °C | 1400 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 38 | |
| 46 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 8.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.1 | |
| 9.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 5.0 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 1.9 |
| Embodied Energy, MJ/kg | 26 | |
| 25 |
| Embodied Water, L/kg | 55 | |
| 58 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 2.5 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 75 to 93 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 4120 | |
| 1460 to 3450 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 84 | |
| 33 to 41 |
| Strength to Weight: Bending, points | 51 | |
| 27 to 31 |
| Thermal Diffusivity, mm2/s | 10 | |
| 13 |
| Thermal Shock Resistance, points | 70 | |
| 27 to 35 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.27 to 0.33 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 0.8 to 1.2 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 92.2 to 95 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 0.3 to 0.6 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 3.0 to 4.0 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.030 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.020 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0 |