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K94200 Alloy vs. 2218 Aluminum

K94200 alloy belongs to the iron alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is K94200 alloy and the bottom bar is 2218 aluminum.

UNS K94200 (FeNi42, 1.3917) Low Expansion Alloy2218 Aluminum
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
73
Elongation at Break, % 5.0 to 32
6.8 to 10
Poisson's Ratio 0.34
0.33
Shear Modulus, GPa 54
27
Shear Strength, MPa 330 to 410
210 to 250
Tensile Strength: Ultimate (UTS), MPa 500 to 710
330 to 430
Tensile Strength: Yield (Proof), MPa 270 to 650
260 to 310

Thermal Properties

Melting Onset (Solidus), °C 1440
510
Specific Heat Capacity, J/kg-K 500
870
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 5.0
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
37
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
110

Otherwise Unclassified Properties

Density, g/cm3 8.2
3.1

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 35 to 130
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 250 to 1460
450 to 650
Stiffness to Weight: Axial, points 9.8
13
Stiffness to Weight: Bending, points 21
45
Strength to Weight: Axial, points 17 to 24
30 to 39
Strength to Weight: Bending, points 17 to 22
34 to 41
Thermal Diffusivity, mm2/s 3.7
52
Thermal Shock Resistance, points 49 to 70
15 to 19