SAE-AISI 8645 Steel vs. Grade N7M Nickel
SAE-AISI 8645 steel belongs to the iron alloys classification, while grade N7M nickel belongs to the nickel alloys. There are 25 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 SAE-AISI 8645 steel and the bottom bar is grade N7M nickel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 12 to 23 | |
| 22 |
| Fatigue Strength, MPa | 280 to 350 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.31 |
| Shear Modulus, GPa | 73 | |
| 85 |
| Tensile Strength: Ultimate (UTS), MPa | 600 to 670 | |
| 590 |
| Tensile Strength: Yield (Proof), MPa | 390 to 560 | |
| 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 900 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1650 |
| Melting Onset (Solidus), °C | 1420 | |
| 1590 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 390 |
| Thermal Expansion, µm/m-K | 13 | |
| 9.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 75 |
| Density, g/cm3 | 7.8 | |
| 9.3 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 16 |
| Embodied Energy, MJ/kg | 20 | |
| 200 |
| Embodied Water, L/kg | 50 | |
| 270 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 77 to 120 | |
| 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 420 to 840 | |
| 220 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 21 to 24 | |
| 18 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 17 |
| Thermal Shock Resistance, points | 18 to 20 | |
| 19 |
Alloy Composition
| Carbon (C), % | 0.43 to 0.48 | |
| 0 to 0.070 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 to 1.0 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 30 to 33 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 60.9 to 70 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |