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AISI 440B Stainless Steel vs. Nickel 686

AISI 440B stainless steel belongs to the iron alloys classification, while nickel 686 belongs to the nickel alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 440B 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, % 3.0 to 18
51
Fatigue Strength, MPa 260 to 850
410
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
77
Shear Strength, MPa 460 to 1110
560
Tensile Strength: Ultimate (UTS), MPa 740 to 1930
780
Tensile Strength: Yield (Proof), MPa 430 to 1860
350

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Maximum Temperature: Mechanical, °C 870
980
Melting Completion (Liquidus), °C 1480
1380
Melting Onset (Solidus), °C 1370
1340
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 23
9.8
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
70
Density, g/cm3 7.7
9.0
Embodied Carbon, kg CO2/kg material 2.2
12
Embodied Energy, MJ/kg 31
170
Embodied Water, L/kg 120
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57 to 110
320
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 27 to 70
24
Strength to Weight: Bending, points 24 to 45
21
Thermal Diffusivity, mm2/s 6.1
2.6
Thermal Shock Resistance, points 27 to 70
21

Alloy Composition

Carbon (C), % 0.75 to 1.0
0 to 0.010
Chromium (Cr), % 16 to 18
19 to 23
Iron (Fe), % 78.2 to 83.3
0 to 5.0
Manganese (Mn), % 0 to 1.0
0 to 0.75
Molybdenum (Mo), % 0 to 0.75
15 to 17
Nickel (Ni), % 0
49.5 to 63
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.080
Sulfur (S), % 0 to 0.015
0 to 0.020
Titanium (Ti), % 0
0.020 to 0.25
Tungsten (W), % 0
3.0 to 4.4