EN 1.1181 Steel vs. SAE-AISI 4340M Steel
Both EN 1.1181 steel and SAE-AISI 4340M steel are iron alloys. They have a very high 96% 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 EN 1.1181 steel and the bottom bar is SAE-AISI 4340M steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 180 | |
| 710 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 19 to 20 | |
| 6.0 |
| Fatigue Strength, MPa | 190 to 260 | |
| 690 |
| Impact Strength: V-Notched Charpy, J | 23 to 38 | |
| 18 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Shear Strength, MPa | 350 to 390 | |
| 1360 |
| Tensile Strength: Ultimate (UTS), MPa | 560 to 620 | |
| 2340 |
| Tensile Strength: Yield (Proof), MPa | 280 to 380 | |
| 1240 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 430 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 42 | |
| 38 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.1 | |
| 3.9 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.9 |
| Embodied Energy, MJ/kg | 19 | |
| 26 |
| Embodied Water, L/kg | 47 | |
| 55 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 90 to 110 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 210 to 380 | |
| 4120 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 20 to 22 | |
| 84 |
| Strength to Weight: Bending, points | 19 to 21 | |
| 51 |
| Thermal Diffusivity, mm2/s | 11 | |
| 10 |
| Thermal Shock Resistance, points | 19 to 21 | |
| 70 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.39 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 0 to 0.4 | |
| 0.7 to 1.0 |
| Iron (Fe), % | 97.4 to 99.18 | |
| 93.3 to 94.8 |
| Manganese (Mn), % | 0.5 to 0.8 | |
| 0.65 to 0.9 |
| Molybdenum (Mo), % | 0 to 0.1 | |
| 0.35 to 0.45 |
| Nickel (Ni), % | 0 to 0.4 | |
| 1.7 to 2.0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.012 |
| Silicon (Si), % | 0 to 0.4 | |
| 1.5 to 1.8 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 to 0.012 |
| Vanadium (V), % | 0 | |
| 0.050 to 0.1 |