Nickel 718 vs. S17400 Stainless Steel
Nickel 718 belongs to the nickel alloys classification, while S17400 stainless steel belongs to the iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 32 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is nickel 718 and the bottom bar is S17400 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 50 | |
| 11 to 21 |
| Fatigue Strength, MPa | 460 to 760 | |
| 380 to 670 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Reduction in Area, % | 34 to 64 | |
| 40 to 62 |
| Rockwell C Hardness | 40 | |
| 27 to 43 |
| Shear Modulus, GPa | 75 | |
| 75 |
| Shear Strength, MPa | 660 to 950 | |
| 570 to 830 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 910 to 1390 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 580 to 1250 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 850 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1440 |
| Melting Onset (Solidus), °C | 1260 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 11 | |
| 17 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.4 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.5 | |
| 2.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 14 |
| Density, g/cm3 | 8.3 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 2.7 |
| Embodied Energy, MJ/kg | 190 | |
| 39 |
| Embodied Water, L/kg | 250 | |
| 130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 390 | |
| 140 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 880 to 4060 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 32 to 49 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 27 to 35 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 4.5 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 30 to 46 |
Alloy Composition
| Aluminum (Al), % | 0.2 to 0.8 | |
| 0 |
| Boron (B), % | 0 to 0.0060 | |
| 0 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.070 |
| Chromium (Cr), % | 17 to 21 | |
| 15 to 17 |
| Cobalt (Co), % | 0 to 1.0 | |
| 0 |
| Copper (Cu), % | 0 to 0.3 | |
| 3.0 to 5.0 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 70.4 to 78.9 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 0 |
| Nickel (Ni), % | 50 to 55 | |
| 3.0 to 5.0 |
| Niobium (Nb), % | 4.8 to 5.5 | |
| 0.15 to 0.45 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0.65 to 1.2 | |
| 0 |