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Grade N7M Nickel vs. S31727 Stainless Steel

Grade N7M nickel belongs to the nickel alloys classification, while S31727 stainless 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 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 grade N7M nickel and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 22
40
Fatigue Strength, MPa 190
240
Poisson's Ratio 0.31
0.28
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 590
630
Tensile Strength: Yield (Proof), MPa 310
270

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 900
1010
Melting Completion (Liquidus), °C 1650
1440
Melting Onset (Solidus), °C 1590
1390
Specific Heat Capacity, J/kg-K 390
470
Thermal Expansion, µm/m-K 9.9
16

Otherwise Unclassified Properties

Base Metal Price, % relative 75
24
Density, g/cm3 9.3
8.0
Embodied Carbon, kg CO2/kg material 16
4.7
Embodied Energy, MJ/kg 200
64
Embodied Water, L/kg 270
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
200
Resilience: Unit (Modulus of Resilience), kJ/m3 220
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 18
22
Strength to Weight: Bending, points 17
20
Thermal Shock Resistance, points 19
14

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 0 to 1.0
17.5 to 19
Copper (Cu), % 0
2.8 to 4.0
Iron (Fe), % 0 to 3.0
53.7 to 61.3
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 30 to 33
3.8 to 4.5
Nickel (Ni), % 60.9 to 70
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030