EN 1.8151 Steel vs. SAE-AISI 4340M Steel
Both EN 1.8151 steel and SAE-AISI 4340M steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is EN 1.8151 steel and the bottom bar is SAE-AISI 4340M steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 540 | |
| 710 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 670 to 1940 | |
| 2340 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 430 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1440 |
| Melting Onset (Solidus), °C | 1400 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 50 | |
| 38 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.2 | |
| 3.9 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 1.9 |
| Embodied Energy, MJ/kg | 25 | |
| 26 |
| Embodied Water, L/kg | 49 | |
| 55 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 70 | |
| 84 |
| Strength to Weight: Bending, points | 22 to 45 | |
| 51 |
| Thermal Diffusivity, mm2/s | 14 | |
| 10 |
| Thermal Shock Resistance, points | 20 to 58 | |
| 70 |
Alloy Composition
| Carbon (C), % | 0.4 to 0.5 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 0.4 to 0.8 | |
| 0.7 to 1.0 |
| Iron (Fe), % | 95.9 to 97.2 | |
| 93.3 to 94.8 |
| Manganese (Mn), % | 0.6 to 0.9 | |
| 0.65 to 0.9 |
| Molybdenum (Mo), % | 0 | |
| 0.35 to 0.45 |
| Nickel (Ni), % | 0 | |
| 1.7 to 2.0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.012 |
| Silicon (Si), % | 1.3 to 1.7 | |
| 1.5 to 1.8 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.012 |
| Vanadium (V), % | 0.1 to 0.2 | |
| 0.050 to 0.1 |