EN 1.4421 Stainless Steel vs. SAE-AISI 4340 Steel
Both EN 1.4421 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 81% of their average alloy composition in common. There are 29 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 1.4421 stainless steel and the bottom bar is SAE-AISI 4340 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 11 to 17 | |
| 12 to 22 |
| Fatigue Strength, MPa | 380 to 520 | |
| 330 to 740 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 880 to 1100 | |
| 690 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 620 to 950 | |
| 470 to 1150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 870 | |
| 430 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1460 |
| Melting Onset (Solidus), °C | 1400 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 16 | |
| 44 |
| Thermal Expansion, µm/m-K | 10 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.2 | |
| 7.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.5 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 3.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 1.7 |
| Embodied Energy, MJ/kg | 36 | |
| 22 |
| Embodied Water, L/kg | 130 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 to 140 | |
| 79 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 960 to 2270 | |
| 590 to 3490 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 31 to 39 | |
| 24 to 45 |
| Strength to Weight: Bending, points | 26 to 30 | |
| 22 to 33 |
| Thermal Diffusivity, mm2/s | 4.4 | |
| 12 |
| Thermal Shock Resistance, points | 31 to 39 | |
| 20 to 38 |
Alloy Composition
| Carbon (C), % | 0 to 0.060 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 15.5 to 17.5 | |
| 0.7 to 0.9 |
| Iron (Fe), % | 74.4 to 80.5 | |
| 95.1 to 96.3 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.6 to 0.8 |
| Molybdenum (Mo), % | 0 to 0.7 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 4.0 to 5.5 | |
| 1.7 to 2.0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.8 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 to 0.040 |