Nickel 718 vs. SAE-AISI 8740 Steel
Nickel 718 belongs to the nickel alloys classification, while SAE-AISI 8740 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is nickel 718 and the bottom bar is SAE-AISI 8740 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 50 | |
| 11 to 23 |
| Fatigue Strength, MPa | 460 to 760 | |
| 270 to 350 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 73 |
| Shear Strength, MPa | 660 to 950 | |
| 370 to 400 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 580 to 670 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 380 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 410 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1460 |
| Melting Onset (Solidus), °C | 1260 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 11 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.4 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.5 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 2.6 |
| Density, g/cm3 | 8.3 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 1.5 |
| Embodied Energy, MJ/kg | 190 | |
| 20 |
| Embodied Water, L/kg | 250 | |
| 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 390 | |
| 71 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 390 to 850 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 20 to 24 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 10 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 17 to 20 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 0 |
| Boron (B), % | 0 to 0.0060 | |
| 0 |
| Carbon (C), % | 0 to 0.080 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 17 to 21 | |
| 0.4 to 0.6 |
| Cobalt (Co), % | 0 to 1.0 | |
| 0 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 96.5 to 97.7 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 50 to 55 | |
| 0.4 to 0.7 |
| Niobium (Nb), % | 4.8 to 5.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.35 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.040 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 0 |