SAE-AISI 8740 Steel vs. EN 1.7231 Steel
Both SAE-AISI 8740 steel and EN 1.7231 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 (2, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is EN 1.7231 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 200 | |
| 240 to 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 23 | |
| 11 to 12 |
| Fatigue Strength, MPa | 270 to 350 | |
| 360 to 500 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
| 790 to 930 |
| Tensile Strength: Yield (Proof), MPa | 380 to 570 | |
| 570 to 800 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 420 |
| 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 | 39 | |
| 46 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 2.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 20 | |
| 20 |
| Embodied Water, L/kg | 50 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 120 | |
| 87 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 to 850 | |
| 870 to 1700 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 20 to 24 | |
| 28 to 33 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 24 to 27 |
| Thermal Diffusivity, mm2/s | 10 | |
| 12 |
| Thermal Shock Resistance, points | 17 to 20 | |
| 23 to 27 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.38 to 0.45 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0.8 to 1.2 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 96.4 to 98.1 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0.15 to 0.3 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.025 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |