EN 1.1127 Steel vs. SAE-AISI 4140 Steel
Both EN 1.1127 steel and SAE-AISI 4140 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is EN 1.1127 steel and the bottom bar is SAE-AISI 4140 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 to 230 | |
| 200 to 310 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 to 25 | |
| 11 to 26 |
| Fatigue Strength, MPa | 280 to 370 | |
| 360 to 650 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 420 to 480 | |
| 410 to 660 |
| Tensile Strength: Ultimate (UTS), MPa | 660 to 790 | |
| 690 to 1080 |
| Tensile Strength: Yield (Proof), MPa | 410 to 580 | |
| 590 to 990 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 420 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 49 | |
| 43 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.1 | |
| 2.4 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 19 | |
| 20 |
| Embodied Water, L/kg | 49 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 90 to 140 | |
| 74 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 440 to 880 | |
| 920 to 2590 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 to 28 | |
| 25 to 38 |
| Strength to Weight: Bending, points | 22 to 24 | |
| 22 to 30 |
| Thermal Diffusivity, mm2/s | 13 | |
| 12 |
| Thermal Shock Resistance, points | 21 to 25 | |
| 20 to 32 |
Alloy Composition
| Carbon (C), % | 0.34 to 0.42 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 0 to 0.4 | |
| 0.8 to 1.1 |
| Iron (Fe), % | 96.6 to 98.1 | |
| 96.8 to 97.8 |
| Manganese (Mn), % | 1.4 to 1.7 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.1 | |
| 0.15 to 0.25 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 to 0.040 |