Nickel 725 vs. SAE-AISI H21 Steel
Nickel 725 belongs to the nickel alloys classification, while SAE-AISI H21 steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is nickel 725 and the bottom bar is SAE-AISI H21 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 | 78 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 860 | |
| 720 to 1790 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 250 |
| Melting Completion (Liquidus), °C | 1340 | |
| 1630 |
| Melting Onset (Solidus), °C | 1270 | |
| 1580 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 440 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 23 |
| Density, g/cm3 | 8.5 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 13 | |
| 4.5 |
| Embodied Energy, MJ/kg | 190 | |
| 68 |
| Embodied Water, L/kg | 270 | |
| 72 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 28 | |
| 23 to 58 |
| Strength to Weight: Bending, points | 24 | |
| 21 to 38 |
| Thermal Shock Resistance, points | 23 | |
| 24 to 59 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.35 | |
| 0 |
| Carbon (C), % | 0 to 0.030 | |
| 0.28 to 0.36 |
| Chromium (Cr), % | 19 to 22.5 | |
| 3.0 to 3.8 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 2.3 to 15.3 | |
| 87.6 to 93.8 |
| Manganese (Mn), % | 0 to 0.35 | |
| 0.15 to 0.4 |
| Molybdenum (Mo), % | 7.0 to 9.5 | |
| 0 |
| Nickel (Ni), % | 55 to 59 | |
| 0 to 0.3 |
| Niobium (Nb), % | 2.8 to 4.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.2 | |
| 0.15 to 0.5 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Titanium (Ti), % | 1.0 to 1.7 | |
| 0 |
| Tungsten (W), % | 0 | |
| 8.5 to 10 |
| Vanadium (V), % | 0 | |
| 0.3 to 0.6 |