SAE-AISI 4340 Steel vs. EN 1.4415 Stainless Steel
Both SAE-AISI 4340 steel and EN 1.4415 stainless steel are iron alloys. They have 83% of their average alloy composition in common. There are 30 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 4340 steel and the bottom bar is EN 1.4415 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 to 22 | |
| 17 to 20 |
| Fatigue Strength, MPa | 330 to 740 | |
| 470 to 510 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Shear Strength, MPa | 430 to 770 | |
| 520 to 570 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 830 to 930 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1150 | |
| 730 to 840 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 790 |
| 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 | |
| 19 |
| Thermal Expansion, µm/m-K | 13 | |
| 9.9 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 2.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 13 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 3.6 |
| Embodied Energy, MJ/kg | 22 | |
| 51 |
| Embodied Water, L/kg | 53 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 79 to 170 | |
| 150 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 3490 | |
| 1350 to 1790 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 29 to 33 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 25 to 27 |
| Thermal Diffusivity, mm2/s | 12 | |
| 5.1 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 30 to 34 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 11.5 to 13.5 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 75.9 to 82.4 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 1.5 to 2.5 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 4.5 to 6.5 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Vanadium (V), % | 0 | |
| 0.1 to 0.5 |