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Nickel 686 vs. ASTM A387 Grade 91 Class 2

Nickel 686 belongs to the nickel alloys classification, while ASTM A387 grade 91 class 2 belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is nickel 686 and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 51
20
Fatigue Strength, MPa 410
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
75
Shear Strength, MPa 560
420
Tensile Strength: Ultimate (UTS), MPa 780
670
Tensile Strength: Yield (Proof), MPa 350
470

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Maximum Temperature: Mechanical, °C 980
600
Melting Completion (Liquidus), °C 1380
1460
Melting Onset (Solidus), °C 1340
1420
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 9.8
26
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.4
10

Otherwise Unclassified Properties

Base Metal Price, % relative 70
7.0
Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 12
2.6
Embodied Energy, MJ/kg 170
37
Embodied Water, L/kg 300
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
120
Resilience: Unit (Modulus of Resilience), kJ/m3 280
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24
24
Strength to Weight: Bending, points 21
22
Thermal Diffusivity, mm2/s 2.6
6.9
Thermal Shock Resistance, points 21
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.010
0.080 to 0.12
Chromium (Cr), % 19 to 23
8.0 to 9.5
Iron (Fe), % 0 to 5.0
87.3 to 90.3
Manganese (Mn), % 0 to 0.75
0.3 to 0.6
Molybdenum (Mo), % 15 to 17
0.85 to 1.1
Nickel (Ni), % 49.5 to 63
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.080
0.2 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.010
Titanium (Ti), % 0.020 to 0.25
0 to 0.010
Tungsten (W), % 3.0 to 4.4
0
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010