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Nickel 686 vs. S44725 Stainless Steel

Nickel 686 belongs to the nickel alloys classification, while S44725 stainless steel belongs to the iron alloys. They have a modest 26% 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 S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 51
22
Fatigue Strength, MPa 410
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 77
81
Shear Strength, MPa 560
320
Tensile Strength: Ultimate (UTS), MPa 780
500
Tensile Strength: Yield (Proof), MPa 350
310

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1380
1450
Melting Onset (Solidus), °C 1340
1410
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
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.4
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 70
15
Density, g/cm3 9.0
7.7
Embodied Carbon, kg CO2/kg material 12
3.1
Embodied Energy, MJ/kg 170
44
Embodied Water, L/kg 300
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
99
Resilience: Unit (Modulus of Resilience), kJ/m3 280
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24
18
Strength to Weight: Bending, points 21
18
Thermal Diffusivity, mm2/s 2.6
4.6
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.015
Chromium (Cr), % 19 to 23
25 to 28.5
Iron (Fe), % 0 to 5.0
67.6 to 73.5
Manganese (Mn), % 0 to 0.75
0 to 0.4
Molybdenum (Mo), % 15 to 17
1.5 to 2.5
Nickel (Ni), % 49.5 to 63
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.080
0 to 0.040
Sulfur (S), % 0 to 0.020
0 to 0.020
Titanium (Ti), % 0.020 to 0.25
0 to 0.26
Tungsten (W), % 3.0 to 4.4
0