Nickel 718 vs. SAE-AISI D4 Steel
Nickel 718 belongs to the nickel alloys classification, while SAE-AISI D4 steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is nickel 718 and the bottom bar is SAE-AISI D4 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 50 | |
| 8.4 to 15 |
| Fatigue Strength, MPa | 460 to 760 | |
| 310 to 920 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 75 | |
| 74 |
| Shear Strength, MPa | 660 to 950 | |
| 460 to 1210 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 760 to 2060 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 470 to 1540 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 270 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1430 |
| Melting Onset (Solidus), °C | 1260 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 11 | |
| 31 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.4 | |
| 4.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.5 | |
| 5.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 8.0 |
| Density, g/cm3 | 8.3 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 3.3 |
| Embodied Energy, MJ/kg | 190 | |
| 49 |
| Embodied Water, L/kg | 250 | |
| 100 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 390 | |
| 100 to 160 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 27 to 75 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 24 to 47 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 8.3 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 23 to 63 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 0 |
| Boron (B), % | 0 to 0.0060 | |
| 0 |
| Carbon (C), % | 0 to 0.080 | |
| 2.1 to 2.4 |
| Chromium (Cr), % | 17 to 21 | |
| 11 to 13 |
| Cobalt (Co), % | 0 to 1.0 | |
| 0 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 to 0.25 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 80.6 to 86.3 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0 to 0.6 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 0.7 to 1.2 |
| Nickel (Ni), % | 50 to 55 | |
| 0 to 0.3 |
| Niobium (Nb), % | 4.8 to 5.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.35 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 0 |
| Vanadium (V), % | 0 | |
| 0 to 1.0 |