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Nickel 690 vs. S21640 Stainless Steel

Nickel 690 belongs to the nickel alloys classification, while S21640 stainless steel belongs to the iron alloys. They have a modest 33% 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 S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 90
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 3.4 to 34
46
Fatigue Strength, MPa 180 to 300
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
78
Shear Strength, MPa 420 to 570
520
Tensile Strength: Ultimate (UTS), MPa 640 to 990
740
Tensile Strength: Yield (Proof), MPa 250 to 760
350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1010
940
Melting Completion (Liquidus), °C 1380
1430
Melting Onset (Solidus), °C 1340
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 14
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 50
17
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 8.2
3.6
Embodied Energy, MJ/kg 120
51
Embodied Water, L/kg 290
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 170
280
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 1440
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 33
27
Strength to Weight: Bending, points 20 to 27
23
Thermal Diffusivity, mm2/s 3.5
4.0
Thermal Shock Resistance, points 16 to 25
16

Alloy Composition

Carbon (C), % 0 to 0.050
0 to 0.080
Chromium (Cr), % 27 to 31
17.5 to 19.5
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 7.0 to 11
63 to 74.3
Manganese (Mn), % 0 to 0.5
3.5 to 6.5
Molybdenum (Mo), % 0
0.5 to 2.0
Nickel (Ni), % 58 to 66
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030