SAE-AISI 4140 Steel vs. EN 1.4640 Stainless Steel
Both SAE-AISI 4140 steel and EN 1.4640 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is EN 1.4640 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 310 | |
| 190 to 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 11 to 26 | |
| 51 |
| Fatigue Strength, MPa | 360 to 650 | |
| 230 to 250 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Shear Strength, MPa | 410 to 660 | |
| 440 to 460 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1080 | |
| 620 to 650 |
| Tensile Strength: Yield (Proof), MPa | 590 to 990 | |
| 240 to 260 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 930 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1420 |
| Melting Onset (Solidus), °C | 1420 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 43 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 14 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 2.8 |
| Embodied Energy, MJ/kg | 20 | |
| 40 |
| Embodied Water, L/kg | 51 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 74 to 180 | |
| 250 to 260 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 920 to 2590 | |
| 150 to 170 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 25 to 38 | |
| 22 to 23 |
| Strength to Weight: Bending, points | 22 to 30 | |
| 21 |
| Thermal Diffusivity, mm2/s | 12 | |
| 4.0 |
| Thermal Shock Resistance, points | 20 to 32 | |
| 14 to 15 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.030 to 0.080 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 18 to 19 |
| Copper (Cu), % | 0 | |
| 1.3 to 2.0 |
| Iron (Fe), % | 96.8 to 97.8 | |
| 67.4 to 73.6 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 1.5 to 4.0 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 5.5 to 6.9 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.11 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.045 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.015 |