SAE-AISI 4140 Steel vs. EN 1.1158 Steel
Both SAE-AISI 4140 steel and EN 1.1158 steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 1.1158 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 310 | |
| 140 to 150 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 26 | |
| 23 to 24 |
| Fatigue Strength, MPa | 360 to 650 | |
| 170 to 220 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 410 to 660 | |
| 300 to 320 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1080 | |
| 470 to 500 |
| Tensile Strength: Yield (Proof), MPa | 590 to 990 | |
| 240 to 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 400 |
| 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 | 43 | |
| 49 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 2.1 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.4 |
| Embodied Energy, MJ/kg | 20 | |
| 19 |
| Embodied Water, L/kg | 51 | |
| 47 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 74 to 180 | |
| 89 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 920 to 2590 | |
| 150 to 250 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 25 to 38 | |
| 17 to 18 |
| Strength to Weight: Bending, points | 22 to 30 | |
| 17 to 18 |
| Thermal Diffusivity, mm2/s | 12 | |
| 13 |
| Thermal Shock Resistance, points | 20 to 32 | |
| 15 to 16 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.22 to 0.29 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 0 to 0.4 |
| Iron (Fe), % | 96.8 to 97.8 | |
| 97.6 to 99.38 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0.4 to 0.7 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 to 0.1 |
| Nickel (Ni), % | 0 | |
| 0 to 0.4 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.035 |