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Nickel 690 vs. S21904 Stainless Steel

Nickel 690 belongs to the nickel alloys classification, while S21904 stainless steel belongs to the iron alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is nickel 690 and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 90
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 3.4 to 34
17 to 51
Fatigue Strength, MPa 180 to 300
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
78
Shear Strength, MPa 420 to 570
510 to 620
Tensile Strength: Ultimate (UTS), MPa 640 to 990
700 to 1000
Tensile Strength: Yield (Proof), MPa 250 to 760
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1010
980
Melting Completion (Liquidus), °C 1380
1400
Melting Onset (Solidus), °C 1340
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 14
14
Thermal Expansion, µm/m-K 14
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 50
15
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 8.2
3.0
Embodied Energy, MJ/kg 120
43
Embodied Water, L/kg 290
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 170
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 1440
380 to 2070
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 33
25 to 36
Strength to Weight: Bending, points 20 to 27
23 to 29
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 16 to 25
15 to 21

Alloy Composition

Carbon (C), % 0 to 0.050
0 to 0.040
Chromium (Cr), % 27 to 31
19 to 21.5
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 7.0 to 11
59.5 to 67.4
Manganese (Mn), % 0 to 0.5
8.0 to 10
Nickel (Ni), % 58 to 66
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030

Comparable Variants