EN 1.1122 Steel vs. SAE-AISI 1140 Steel
Both EN 1.1122 steel and SAE-AISI 1140 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is EN 1.1122 steel and the bottom bar is SAE-AISI 1140 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 100 to 130 | |
| 170 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 21 | |
| 14 to 18 |
| Fatigue Strength, MPa | 170 to 260 | |
| 230 to 370 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 63 to 73 | |
| 39 to 46 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Shear Strength, MPa | 240 to 290 | |
| 370 to 420 |
| Tensile Strength: Ultimate (UTS), MPa | 340 to 460 | |
| 600 to 700 |
| Tensile Strength: Yield (Proof), MPa | 240 to 370 | |
| 340 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 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 | 51 | |
| 51 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.0 | |
| 7.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.0 | |
| 8.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 1.8 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.4 |
| Embodied Energy, MJ/kg | 18 | |
| 18 |
| Embodied Water, L/kg | 46 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 36 to 89 | |
| 89 to 93 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 to 360 | |
| 310 to 870 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 12 to 16 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 14 to 17 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 14 | |
| 14 |
| Thermal Shock Resistance, points | 11 to 15 | |
| 18 to 21 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.12 | |
| 0.37 to 0.44 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 98.7 to 99.62 | |
| 98.4 to 98.9 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.7 to 1.0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.3 | |
| 0 |
| Sulfur (S), % | 0 to 0.025 | |
| 0.080 to 0.13 |