Nickel 725 vs. SAE-AISI 8740 Steel
Nickel 725 belongs to the nickel alloys classification, while SAE-AISI 8740 steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is nickel 725 and the bottom bar is SAE-AISI 8740 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 34 | |
| 11 to 23 |
| Fatigue Strength, MPa | 260 | |
| 270 to 350 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 78 | |
| 73 |
| Shear Strength, MPa | 580 | |
| 370 to 400 |
| Tensile Strength: Ultimate (UTS), MPa | 860 | |
| 580 to 670 |
| Tensile Strength: Yield (Proof), MPa | 350 | |
| 380 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 410 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1460 |
| Melting Onset (Solidus), °C | 1270 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 470 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.5 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.6 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 2.6 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 1.5 |
| Embodied Energy, MJ/kg | 190 | |
| 20 |
| Embodied Water, L/kg | 270 | |
| 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 240 | |
| 71 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 300 | |
| 390 to 850 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 28 | |
| 20 to 24 |
| Strength to Weight: Bending, points | 24 | |
| 20 to 22 |
| Thermal Shock Resistance, points | 23 | |
| 17 to 20 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.35 | |
| 0 |
| Carbon (C), % | 0 to 0.030 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 19 to 22.5 | |
| 0.4 to 0.6 |
| Iron (Fe), % | 2.3 to 15.3 | |
| 96.5 to 97.7 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 7.0 to 9.5 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 55 to 59 | |
| 0.4 to 0.7 |
| Niobium (Nb), % | 2.8 to 4.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.2 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.040 |
| Titanium (Ti), % | 1.0 to 1.7 | |
| 0 |