SAE-AISI 4340 Steel vs. EN 1.4057 Stainless Steel
Both SAE-AISI 4340 steel and EN 1.4057 stainless steel are iron alloys. They have 84% 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 1.4057 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 to 22 | |
| 11 to 17 |
| Fatigue Strength, MPa | 330 to 740 | |
| 320 to 430 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Shear Strength, MPa | 430 to 770 | |
| 520 to 580 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 840 to 980 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1150 | |
| 530 to 790 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 850 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 44 | |
| 25 |
| Thermal Expansion, µm/m-K | 13 | |
| 10 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 9.5 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 2.2 |
| Embodied Energy, MJ/kg | 22 | |
| 32 |
| Embodied Water, L/kg | 53 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 79 to 170 | |
| 96 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 3490 | |
| 700 to 1610 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 30 to 35 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 26 to 28 |
| Thermal Diffusivity, mm2/s | 12 | |
| 6.7 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 30 to 35 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.12 to 0.22 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 15 to 17 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 77.7 to 83.4 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 1.5 to 2.5 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.015 |