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AISI 439 Stainless Steel vs. A242.0 Aluminum

AISI 439 stainless steel belongs to the iron alloys classification, while A242.0 aluminum belongs to the aluminum alloys. There are 26 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 AISI 439 stainless steel and the bottom bar is A242.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
75
Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 23
1.6
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
27
Tensile Strength: Ultimate (UTS), MPa 490
220

Thermal Properties

Latent Heat of Fusion, J/g 280
390
Maximum Temperature: Mechanical, °C 890
210
Melting Completion (Liquidus), °C 1510
680
Melting Onset (Solidus), °C 1430
550
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 25
140
Thermal Expansion, µm/m-K 11
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
37
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
12
Density, g/cm3 7.7
3.1
Embodied Carbon, kg CO2/kg material 2.3
8.3
Embodied Energy, MJ/kg 34
150
Embodied Water, L/kg 120
1130

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 18
20
Strength to Weight: Bending, points 18
26
Thermal Diffusivity, mm2/s 6.7
52
Thermal Shock Resistance, points 16
9.3

Alloy Composition

Aluminum (Al), % 0 to 0.15
89.3 to 93.1
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17 to 19
0.15 to 0.25
Copper (Cu), % 0
3.7 to 4.5
Iron (Fe), % 77.1 to 82.8
0 to 0.8
Magnesium (Mg), % 0
1.2 to 1.7
Manganese (Mn), % 0 to 1.0
0 to 0.1
Nickel (Ni), % 0 to 0.5
1.8 to 2.3
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0.2 to 1.1
0.070 to 0.2
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15