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238.0 Aluminum vs. AISI 439 Stainless Steel

238.0 aluminum belongs to the aluminum alloys classification, while AISI 439 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (7, 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 238.0 aluminum and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 76
200
Elongation at Break, % 1.5
23
Fatigue Strength, MPa 110
170
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Tensile Strength: Ultimate (UTS), MPa 210
490
Tensile Strength: Yield (Proof), MPa 170
250

Thermal Properties

Latent Heat of Fusion, J/g 430
280
Maximum Temperature: Mechanical, °C 170
890
Melting Completion (Liquidus), °C 600
1510
Melting Onset (Solidus), °C 510
1430
Specific Heat Capacity, J/kg-K 840
480
Thermal Conductivity, W/m-K 100
25
Thermal Expansion, µm/m-K 21
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 67
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.0
Density, g/cm3 3.4
7.7
Embodied Carbon, kg CO2/kg material 7.4
2.3
Embodied Energy, MJ/kg 140
34
Embodied Water, L/kg 1040
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.9
95
Resilience: Unit (Modulus of Resilience), kJ/m3 180
160
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 42
25
Strength to Weight: Axial, points 17
18
Strength to Weight: Bending, points 23
18
Thermal Diffusivity, mm2/s 37
6.7
Thermal Shock Resistance, points 9.1
16

Alloy Composition

Aluminum (Al), % 81.9 to 84.9
0 to 0.15
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 9.5 to 10.5
0
Iron (Fe), % 1.0 to 1.5
77.1 to 82.8
Magnesium (Mg), % 0 to 0.25
0
Manganese (Mn), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 3.6 to 4.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1
Zinc (Zn), % 1.0 to 1.5
0