EN 1.4031 Stainless Steel vs. SAE-AISI 4340M Steel
Both EN 1.4031 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 87% 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 EN 1.4031 stainless steel and the bottom bar is SAE-AISI 4340M steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 13 | |
| 6.0 |
| Fatigue Strength, MPa | 220 to 400 | |
| 690 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 76 | |
| 72 |
| Shear Strength, MPa | 400 to 540 | |
| 1360 |
| Tensile Strength: Ultimate (UTS), MPa | 670 to 900 | |
| 2340 |
| Tensile Strength: Yield (Proof), MPa | 390 to 730 | |
| 1240 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 770 | |
| 430 |
| 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 | 30 | |
| 38 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 3.1 | |
| 7.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.7 | |
| 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 3.9 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 1.9 |
| Embodied Energy, MJ/kg | 27 | |
| 26 |
| Embodied Water, L/kg | 100 | |
| 55 |
Common Calculations
| PREN (Pitting Resistance) | 14 | |
| 2.2 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 77 to 94 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 1360 | |
| 4120 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 32 | |
| 84 |
| Strength to Weight: Bending, points | 22 to 27 | |
| 51 |
| Thermal Diffusivity, mm2/s | 8.1 | |
| 10 |
| Thermal Shock Resistance, points | 23 to 32 | |
| 70 |
Alloy Composition
| Carbon (C), % | 0.36 to 0.42 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 12.5 to 14.5 | |
| 0.7 to 1.0 |
| Iron (Fe), % | 83 to 87.1 | |
| 93.3 to 94.8 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.65 to 0.9 |
| Molybdenum (Mo), % | 0 | |
| 0.35 to 0.45 |
| Nickel (Ni), % | 0 | |
| 1.7 to 2.0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.012 |
| Silicon (Si), % | 0 to 1.0 | |
| 1.5 to 1.8 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.012 |
| Vanadium (V), % | 0 | |
| 0.050 to 0.1 |