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SAE-AISI P21 Steel vs. Nickel 686

SAE-AISI P21 steel belongs to the iron alloys classification, while nickel 686 belongs to the nickel alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P21 steel and the bottom bar is nickel 686.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 1130
780

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1380
Melting Onset (Solidus), °C 1410
1340
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 41
9.8
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
70
Density, g/cm3 7.9
9.0
Embodied Carbon, kg CO2/kg material 2.3
12
Embodied Energy, MJ/kg 32
170
Embodied Water, L/kg 62
300

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 40
24
Strength to Weight: Bending, points 31
21
Thermal Diffusivity, mm2/s 11
2.6
Thermal Shock Resistance, points 37
21

Alloy Composition

Carbon (C), % 0.18 to 0.22
0 to 0.010
Chromium (Cr), % 0 to 0.5
19 to 23
Cobalt (Co), % 1.1 to 1.3
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.1 to 94.2
0 to 5.0
Manganese (Mn), % 0.35 to 0.72
0 to 0.75
Molybdenum (Mo), % 0
15 to 17
Nickel (Ni), % 3.9 to 4.3
49.5 to 63
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 0.080
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0.020 to 0.25
Tungsten (W), % 0
3.0 to 4.4
Vanadium (V), % 0.15 to 0.25
0