Nickel 718 vs. S15500 Stainless Steel
Nickel 718 belongs to the nickel alloys classification, while S15500 stainless steel belongs to the iron alloys. They have a modest 38% 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 S15500 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 50 | |
| 6.8 to 16 |
| Fatigue Strength, MPa | 460 to 760 | |
| 350 to 650 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Reduction in Area, % | 34 to 64 | |
| 17 to 40 |
| Rockwell C Hardness | 40 | |
| 27 to 46 |
| Shear Modulus, GPa | 75 | |
| 75 |
| Shear Strength, MPa | 660 to 950 | |
| 540 to 870 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1530 | |
| 890 to 1490 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1330 | |
| 590 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 820 |
| 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 | |
| 17 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.4 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.5 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 13 |
| 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 | |
| 98 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 660 to 4560 | |
| 890 to 4460 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 31 to 51 | |
| 32 to 53 |
| Strength to Weight: Bending, points | 25 to 35 | |
| 26 to 37 |
| Thermal Diffusivity, mm2/s | 3.0 | |
| 4.6 |
| Thermal Shock Resistance, points | 27 to 44 | |
| 30 to 50 |
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 | |
| 14 to 15.5 |
| Cobalt (Co), % | 0 to 1.0 | |
| 0 |
| Copper (Cu), % | 0 to 0.3 | |
| 2.5 to 4.5 |
| Iron (Fe), % | 11.1 to 24.6 | |
| 71.9 to 79.9 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 2.8 to 3.3 | |
| 0 |
| Nickel (Ni), % | 50 to 55 | |
| 3.5 to 5.5 |
| 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 |