SAE-AISI 8740 Steel vs. SAE-AISI 1018 Steel
Both SAE-AISI 8740 steel and SAE-AISI 1018 steel are iron alloys. They have a very high 98% 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 8740 steel and the bottom bar is SAE-AISI 1018 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 200 | |
| 130 to 140 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 23 | |
| 17 to 27 |
| Fatigue Strength, MPa | 270 to 350 | |
| 180 to 270 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 370 to 400 | |
| 280 to 300 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
| 430 to 480 |
| Tensile Strength: Yield (Proof), MPa | 380 to 570 | |
| 240 to 400 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 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 | 39 | |
| 52 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.4 |
| Embodied Energy, MJ/kg | 20 | |
| 18 |
| Embodied Water, L/kg | 50 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 120 | |
| 75 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 to 850 | |
| 150 to 430 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 20 to 24 | |
| 15 to 17 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 16 to 17 |
| Thermal Diffusivity, mm2/s | 10 | |
| 14 |
| Thermal Shock Resistance, points | 17 to 20 | |
| 14 to 15 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.15 to 0.2 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 98.8 to 99.25 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0.6 to 0.9 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.050 |