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S21904 Stainless Steel vs. Grade N7M Nickel

S21904 stainless 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 (8, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is grade N7M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 17 to 51
22
Fatigue Strength, MPa 380 to 550
190
Poisson's Ratio 0.28
0.31
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
590
Tensile Strength: Yield (Proof), MPa 390 to 910
310

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Maximum Temperature: Mechanical, °C 980
900
Melting Completion (Liquidus), °C 1400
1650
Melting Onset (Solidus), °C 1350
1590
Specific Heat Capacity, J/kg-K 480
390
Thermal Expansion, µm/m-K 17
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 15
75
Density, g/cm3 7.7
9.3
Embodied Carbon, kg CO2/kg material 3.0
16
Embodied Energy, MJ/kg 43
200
Embodied Water, L/kg 160
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
110
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 25 to 36
18
Strength to Weight: Bending, points 23 to 29
17
Thermal Shock Resistance, points 15 to 21
19

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.070
Chromium (Cr), % 19 to 21.5
0 to 1.0
Iron (Fe), % 59.5 to 67.4
0 to 3.0
Manganese (Mn), % 8.0 to 10
0 to 1.0
Molybdenum (Mo), % 0
30 to 33
Nickel (Ni), % 5.5 to 7.5
60.9 to 70
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030