EN 1.6579 Steel vs. SAE-AISI 4340 Steel
Both EN 1.6579 steel and SAE-AISI 4340 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 (3, in this case) are not shown.
For each property being compared, the top bar is EN 1.6579 steel and the bottom bar is SAE-AISI 4340 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 260 to 290 | |
| 210 to 360 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 14 | |
| 12 to 22 |
| Fatigue Strength, MPa | 380 to 570 | |
| 330 to 740 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 850 to 980 | |
| 690 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 600 to 910 | |
| 470 to 1150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 430 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 39 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
| 7.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.7 | |
| 3.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 1.7 |
| Embodied Energy, MJ/kg | 22 | |
| 22 |
| Embodied Water, L/kg | 56 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 to 120 | |
| 79 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 950 to 2210 | |
| 590 to 3490 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 30 to 35 | |
| 24 to 45 |
| Strength to Weight: Bending, points | 25 to 28 | |
| 22 to 33 |
| Thermal Diffusivity, mm2/s | 11 | |
| 12 |
| Thermal Shock Resistance, points | 25 to 29 | |
| 20 to 38 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.38 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 1.4 to 1.7 | |
| 0.7 to 0.9 |
| Iron (Fe), % | 94.2 to 96.1 | |
| 95.1 to 96.3 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.6 to 0.8 |
| Molybdenum (Mo), % | 0.15 to 0.35 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 1.4 to 1.7 | |
| 1.7 to 2.0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.6 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |