SAE-AISI 4340 Steel vs. EN 1.4020 Stainless Steel
Both SAE-AISI 4340 steel and EN 1.4020 stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 1.4020 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 360 | |
| 190 to 340 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 to 22 | |
| 13 to 34 |
| Fatigue Strength, MPa | 330 to 740 | |
| 340 to 540 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Shear Strength, MPa | 430 to 770 | |
| 510 to 680 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 770 to 1130 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1150 | |
| 430 to 950 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 890 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1390 |
| Melting Onset (Solidus), °C | 1420 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 11 |
| Density, g/cm3 | 7.8 | |
| 7.6 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 2.5 |
| Embodied Energy, MJ/kg | 22 | |
| 37 |
| Embodied Water, L/kg | 53 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 79 to 170 | |
| 140 to 220 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 3490 | |
| 460 to 2290 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 28 to 41 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 25 to 32 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 16 to 23 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 16.5 to 19 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 62.8 to 71.8 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 11 to 14 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 0.5 to 2.5 |
| Nitrogen (N), % | 0 | |
| 0.2 to 0.45 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.045 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |