EN 1.7231 Steel vs. SAE-AISI 4340M Steel
Both EN 1.7231 steel and SAE-AISI 4340M steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is EN 1.7231 steel and the bottom bar is SAE-AISI 4340M steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 240 to 280 | |
| 710 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 12 | |
| 6.0 |
| Fatigue Strength, MPa | 360 to 500 | |
| 690 |
| Impact Strength: V-Notched Charpy, J | 28 to 30 | |
| 18 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 790 to 930 | |
| 2340 |
| Tensile Strength: Yield (Proof), MPa | 570 to 800 | |
| 1240 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 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 | 46 | |
| 38 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.5 | |
| 3.9 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.9 |
| Embodied Energy, MJ/kg | 20 | |
| 26 |
| Embodied Water, L/kg | 51 | |
| 55 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 100 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 870 to 1700 | |
| 4120 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 28 to 33 | |
| 84 |
| Strength to Weight: Bending, points | 24 to 27 | |
| 51 |
| Thermal Diffusivity, mm2/s | 12 | |
| 10 |
| Thermal Shock Resistance, points | 23 to 27 | |
| 70 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.45 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 0.8 to 1.2 | |
| 0.7 to 1.0 |
| Iron (Fe), % | 96.4 to 98.1 | |
| 93.3 to 94.8 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.65 to 0.9 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 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), % | 0 to 0.6 | |
| 1.5 to 1.8 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.012 |
| Vanadium (V), % | 0 | |
| 0.050 to 0.1 |