SAE-AISI 4340M Steel vs. EN 1.4122 Stainless Steel
Both SAE-AISI 4340M steel and EN 1.4122 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 1.4122 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 6.0 | |
| 14 |
| Fatigue Strength, MPa | 690 | |
| 260 to 360 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 77 |
| Shear Strength, MPa | 1360 | |
| 480 to 520 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 790 to 850 |
| Tensile Strength: Yield (Proof), MPa | 1240 | |
| 450 to 630 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 870 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1440 |
| 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 | |
| 9.5 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 2.4 |
| Embodied Energy, MJ/kg | 26 | |
| 33 |
| Embodied Water, L/kg | 55 | |
| 120 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 20 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 93 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 4120 | |
| 520 to 1000 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 84 | |
| 28 to 31 |
| Strength to Weight: Bending, points | 51 | |
| 25 to 26 |
| Thermal Diffusivity, mm2/s | 10 | |
| 4.0 |
| Thermal Shock Resistance, points | 70 | |
| 28 to 30 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.33 to 0.45 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 15.5 to 17.5 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 77.2 to 83.4 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 0.8 to 1.3 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 0 to 1.0 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.040 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.015 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0 |