Grade N7M Nickel vs. ASTM A227 Spring Steel
Grade N7M nickel belongs to the nickel alloys classification, while ASTM A227 spring steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is grade N7M nickel and the bottom bar is ASTM A227 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 22 | |
| 12 |
| Fatigue Strength, MPa | 190 | |
| 900 to 1160 |
| Poisson's Ratio | 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 85 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 590 | |
| 1720 to 2220 |
| Tensile Strength: Yield (Proof), MPa | 310 | |
| 1430 to 1850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 900 | |
| 400 |
| Melting Completion (Liquidus), °C | 1650 | |
| 1450 |
| Melting Onset (Solidus), °C | 1590 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 390 | |
| 470 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 1.8 |
| Density, g/cm3 | 9.3 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 16 | |
| 1.4 |
| Embodied Energy, MJ/kg | 200 | |
| 19 |
| Embodied Water, L/kg | 270 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 | |
| 200 to 260 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 18 | |
| 61 to 79 |
| Strength to Weight: Bending, points | 17 | |
| 41 to 48 |
| Thermal Shock Resistance, points | 19 | |
| 55 to 71 |
Alloy Composition
| Carbon (C), % | 0 to 0.070 | |
| 0.45 to 0.85 |
| Chromium (Cr), % | 0 to 1.0 | |
| 0 |
| Iron (Fe), % | 0 to 3.0 | |
| 97.4 to 99.1 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.3 to 1.3 |
| Molybdenum (Mo), % | 30 to 33 | |
| 0 |
| Nickel (Ni), % | 60.9 to 70 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.050 |