SAE-AISI 4340M Steel vs. EN 1.4418 Stainless Steel
Both SAE-AISI 4340M steel and EN 1.4418 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 32 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 SAE-AISI 4340M steel and the bottom bar is EN 1.4418 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 6.0 | |
| 16 to 20 |
| Fatigue Strength, MPa | 690 | |
| 350 to 480 |
| Impact Strength: V-Notched Charpy, J | 18 | |
| 62 to 90 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 77 |
| Shear Strength, MPa | 1360 | |
| 530 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 860 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 1240 | |
| 540 to 790 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 870 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1450 |
| Melting Onset (Solidus), °C | 1400 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 38 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 10 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.1 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 13 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 2.8 |
| Embodied Energy, MJ/kg | 26 | |
| 39 |
| Embodied Water, L/kg | 55 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 20 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 130 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 4120 | |
| 730 to 1590 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 84 | |
| 31 to 36 |
| Strength to Weight: Bending, points | 51 | |
| 26 to 28 |
| Thermal Diffusivity, mm2/s | 10 | |
| 4.0 |
| Thermal Shock Resistance, points | 70 | |
| 31 to 36 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.060 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 15 to 17 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 73.2 to 80.2 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 0.8 to 1.5 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 4.0 to 6.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.020 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.040 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 0.7 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.015 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0 |