Nickel 684 vs. SAE-AISI M44 Steel
Nickel 684 belongs to the nickel alloys classification, while SAE-AISI M44 steel belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is nickel 684 and the bottom bar is SAE-AISI M44 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 76 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 1190 | |
| 870 to 2290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 270 |
| Melting Completion (Liquidus), °C | 1370 | |
| 1590 |
| Melting Onset (Solidus), °C | 1320 | |
| 1540 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 440 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 43 |
| Density, g/cm3 | 8.3 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 10 | |
| 9.9 |
| Embodied Energy, MJ/kg | 140 | |
| 150 |
| Embodied Water, L/kg | 360 | |
| 170 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 40 | |
| 28 to 75 |
| Strength to Weight: Bending, points | 30 | |
| 24 to 46 |
| Thermal Shock Resistance, points | 34 | |
| 27 to 70 |
Alloy Composition
| Aluminum (Al), % | 2.5 to 3.3 | |
| 0 |
| Boron (B), % | 0.0030 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 1.1 to 1.2 |
| Chromium (Cr), % | 15 to 20 | |
| 4.0 to 4.8 |
| Cobalt (Co), % | 13 to 20 | |
| 11 to 12.3 |
| Copper (Cu), % | 0 to 0.15 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 4.0 | |
| 65.3 to 70.6 |
| Manganese (Mn), % | 0 to 0.75 | |
| 0.2 to 0.4 |
| Molybdenum (Mo), % | 3.0 to 5.0 | |
| 6.0 to 7.0 |
| Nickel (Ni), % | 42.7 to 64 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.75 | |
| 0.3 to 0.55 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Titanium (Ti), % | 2.5 to 3.3 | |
| 0 |
| Tungsten (W), % | 0 | |
| 5.0 to 5.8 |
| Vanadium (V), % | 0 | |
| 1.9 to 2.2 |