SAE-AISI 4340 Steel vs. EN 1.7701 Steel
Both SAE-AISI 4340 steel and EN 1.7701 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is EN 1.7701 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 360 | |
| 200 to 480 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 670 to 2010 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 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 | 44 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 2.6 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 1.9 |
| Embodied Energy, MJ/kg | 22 | |
| 26 |
| Embodied Water, L/kg | 53 | |
| 52 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 24 to 71 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 22 to 45 |
| Thermal Diffusivity, mm2/s | 12 | |
| 12 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 20 to 59 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.48 to 0.56 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 0.9 to 1.2 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 96.2 to 97.7 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0.7 to 1.1 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0.15 to 0.3 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.025 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.025 |
| Vanadium (V), % | 0 | |
| 0.1 to 0.2 |