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SAE-AISI 8740 Steel vs. Nickel 686

SAE-AISI 8740 steel 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 (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is nickel 686.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 11 to 23
51
Fatigue Strength, MPa 270 to 350
410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
77
Shear Strength, MPa 370 to 400
560
Tensile Strength: Ultimate (UTS), MPa 580 to 670
780
Tensile Strength: Yield (Proof), MPa 380 to 570
350

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 410
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 39
9.8
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
70
Density, g/cm3 7.8
9.0
Embodied Carbon, kg CO2/kg material 1.5
12
Embodied Energy, MJ/kg 20
170
Embodied Water, L/kg 50
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
320
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
280
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 20 to 24
24
Strength to Weight: Bending, points 20 to 22
21
Thermal Diffusivity, mm2/s 10
2.6
Thermal Shock Resistance, points 17 to 20
21

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.010
Chromium (Cr), % 0.4 to 0.6
19 to 23
Iron (Fe), % 96.5 to 97.7
0 to 5.0
Manganese (Mn), % 0.75 to 1.0
0 to 0.75
Molybdenum (Mo), % 0.2 to 0.3
15 to 17
Nickel (Ni), % 0.4 to 0.7
49.5 to 63
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.080
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0.020 to 0.25
Tungsten (W), % 0
3.0 to 4.4