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Nickel 686 vs. SAE-AISI M7 Steel

Nickel 686 belongs to the nickel alloys classification, while SAE-AISI M7 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is nickel 686 and the bottom bar is SAE-AISI M7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 780
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1380
1560
Melting Onset (Solidus), °C 1340
1510
Specific Heat Capacity, J/kg-K 420
450
Thermal Conductivity, W/m-K 9.8
28
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 70
18
Density, g/cm3 9.0
8.1
Embodied Carbon, kg CO2/kg material 12
8.9
Embodied Energy, MJ/kg 170
130
Embodied Water, L/kg 300
100

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24
26 to 76
Strength to Weight: Bending, points 21
23 to 47
Thermal Diffusivity, mm2/s 2.6
7.8
Thermal Shock Resistance, points 21
24 to 69

Alloy Composition

Carbon (C), % 0 to 0.010
1.0 to 1.1
Chromium (Cr), % 19 to 23
3.5 to 4.0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 5.0
79.8 to 83.8
Manganese (Mn), % 0 to 0.75
0.15 to 0.4
Molybdenum (Mo), % 15 to 17
8.2 to 9.2
Nickel (Ni), % 49.5 to 63
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.080
0.2 to 0.55
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0.020 to 0.25
0
Tungsten (W), % 3.0 to 4.4
1.4 to 2.1
Vanadium (V), % 0
1.8 to 2.3