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Nickel 686 vs. S41425 Stainless Steel

Nickel 686 belongs to the nickel alloys classification, while S41425 stainless steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is nickel 686 and the bottom bar is S41425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 51
17
Fatigue Strength, MPa 410
450
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 560
570
Tensile Strength: Ultimate (UTS), MPa 780
920
Tensile Strength: Yield (Proof), MPa 350
750

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Maximum Temperature: Mechanical, °C 980
810
Melting Completion (Liquidus), °C 1380
1450
Melting Onset (Solidus), °C 1340
1410
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 9.8
16
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 70
13
Density, g/cm3 9.0
7.9
Embodied Carbon, kg CO2/kg material 12
2.9
Embodied Energy, MJ/kg 170
40
Embodied Water, L/kg 300
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
150
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1420
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24
33
Strength to Weight: Bending, points 21
27
Thermal Diffusivity, mm2/s 2.6
4.4
Thermal Shock Resistance, points 21
33

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.050
Chromium (Cr), % 19 to 23
12 to 15
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 5.0
74 to 81.9
Manganese (Mn), % 0 to 0.75
0.5 to 1.0
Molybdenum (Mo), % 15 to 17
1.5 to 2.0
Nickel (Ni), % 49.5 to 63
4.0 to 7.0
Nitrogen (N), % 0
0.060 to 0.12
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.080
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.0050
Titanium (Ti), % 0.020 to 0.25
0
Tungsten (W), % 3.0 to 4.4
0