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Nickel 686 vs. S44626 Stainless Steel

Nickel 686 belongs to the nickel alloys classification, while S44626 stainless steel belongs to the iron alloys. They have a modest 25% 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 S44626 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 51
23
Fatigue Strength, MPa 410
230
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 77
80
Shear Strength, MPa 560
340
Tensile Strength: Ultimate (UTS), MPa 780
540
Tensile Strength: Yield (Proof), MPa 350
350

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1380
1440
Melting Onset (Solidus), °C 1340
1390
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 9.8
17
Thermal Expansion, µm/m-K 12
11

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
14
Density, g/cm3 9.0
7.7
Embodied Carbon, kg CO2/kg material 12
2.9
Embodied Energy, MJ/kg 170
42
Embodied Water, L/kg 300
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
110
Resilience: Unit (Modulus of Resilience), kJ/m3 280
300
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 22
26
Strength to Weight: Axial, points 24
19
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 2.6
4.6
Thermal Shock Resistance, points 21
18

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.060
Chromium (Cr), % 19 to 23
25 to 27
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 0 to 5.0
68.1 to 74.1
Manganese (Mn), % 0 to 0.75
0 to 0.75
Molybdenum (Mo), % 15 to 17
0.75 to 1.5
Nickel (Ni), % 49.5 to 63
0 to 0.5
Nitrogen (N), % 0
0 to 0.040
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.080
0 to 0.75
Sulfur (S), % 0 to 0.020
0 to 0.020
Titanium (Ti), % 0.020 to 0.25
0.2 to 1.0
Tungsten (W), % 3.0 to 4.4
0