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ASTM A387 Grade 91 Class 2 vs. Nickel 686

ASTM A387 grade 91 class 2 belongs to the iron alloys classification, while nickel 686 belongs to the nickel 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 ASTM A387 grade 91 class 2 and the bottom bar is nickel 686.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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