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Grade N7M Nickel vs. S21640 Stainless Steel

Grade N7M nickel belongs to the nickel alloys classification, while S21640 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is grade N7M nickel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 22
46
Fatigue Strength, MPa 190
320
Poisson's Ratio 0.31
0.28
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 590
740
Tensile Strength: Yield (Proof), MPa 310
350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 900
940
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
17

Otherwise Unclassified Properties

Base Metal Price, % relative 75
17
Density, g/cm3 9.3
7.7
Embodied Carbon, kg CO2/kg material 16
3.6
Embodied Energy, MJ/kg 200
51
Embodied Water, L/kg 270
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
280
Resilience: Unit (Modulus of Resilience), kJ/m3 220
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 18
27
Strength to Weight: Bending, points 17
23
Thermal Shock Resistance, points 19
16

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.080
Chromium (Cr), % 0 to 1.0
17.5 to 19.5
Iron (Fe), % 0 to 3.0
63 to 74.3
Manganese (Mn), % 0 to 1.0
3.5 to 6.5
Molybdenum (Mo), % 30 to 33
0.5 to 2.0
Nickel (Ni), % 60.9 to 70
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030