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AISI 418 Stainless Steel vs. Nickel 686

AISI 418 stainless steel belongs to the iron alloys classification, while nickel 686 belongs to the nickel alloys. They have a modest 21% 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 AISI 418 stainless steel and the bottom bar is nickel 686.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 17
51
Fatigue Strength, MPa 520
410
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
77
Shear Strength, MPa 680
560
Tensile Strength: Ultimate (UTS), MPa 1100
780
Tensile Strength: Yield (Proof), MPa 850
350

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Maximum Temperature: Mechanical, °C 770
980
Melting Completion (Liquidus), °C 1500
1380
Melting Onset (Solidus), °C 1460
1340
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 25
9.8
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
70
Density, g/cm3 8.0
9.0
Embodied Carbon, kg CO2/kg material 2.9
12
Embodied Energy, MJ/kg 41
170
Embodied Water, L/kg 110
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
320
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
280
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 38
24
Strength to Weight: Bending, points 29
21
Thermal Diffusivity, mm2/s 6.7
2.6
Thermal Shock Resistance, points 40
21

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.010
Chromium (Cr), % 12 to 14
19 to 23
Iron (Fe), % 78.5 to 83.6
0 to 5.0
Manganese (Mn), % 0 to 0.5
0 to 0.75
Molybdenum (Mo), % 0 to 0.5
15 to 17
Nickel (Ni), % 1.8 to 2.2
49.5 to 63
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.080
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0.020 to 0.25
Tungsten (W), % 2.5 to 3.5
3.0 to 4.4