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Grade N7M Nickel vs. S31655 Stainless Steel

Grade N7M nickel belongs to the nickel alloys classification, while S31655 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is grade N7M nickel and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 22
39
Fatigue Strength, MPa 190
300
Poisson's Ratio 0.31
0.28
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 590
710
Tensile Strength: Yield (Proof), MPa 310
350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 900
1010
Melting Completion (Liquidus), °C 1650
1430
Melting Onset (Solidus), °C 1590
1380
Specific Heat Capacity, J/kg-K 390
480
Thermal Expansion, µm/m-K 9.9
16

Otherwise Unclassified Properties

Base Metal Price, % relative 75
17
Density, g/cm3 9.3
7.8
Embodied Carbon, kg CO2/kg material 16
3.3
Embodied Energy, MJ/kg 200
46
Embodied Water, L/kg 270
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
230
Resilience: Unit (Modulus of Resilience), kJ/m3 220
310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 18
25
Strength to Weight: Bending, points 17
23
Thermal Shock Resistance, points 19
16

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 0 to 1.0
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 3.0
63.2 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 30 to 33
0.5 to 1.5
Nickel (Ni), % 60.9 to 70
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015