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AISI 439 Stainless Steel vs. 328.0 Aluminum

AISI 439 stainless steel belongs to the iron alloys classification, while 328.0 aluminum belongs to the aluminum alloys. There are 30 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 AISI 439 stainless steel and the bottom bar is 328.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
60 to 82
Elastic (Young's, Tensile) Modulus, GPa 200
72
Elongation at Break, % 23
1.6 to 2.1
Fatigue Strength, MPa 170
55 to 80
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
27
Tensile Strength: Ultimate (UTS), MPa 490
200 to 270
Tensile Strength: Yield (Proof), MPa 250
120 to 170

Thermal Properties

Latent Heat of Fusion, J/g 280
510
Maximum Temperature: Mechanical, °C 890
180
Melting Completion (Liquidus), °C 1510
620
Melting Onset (Solidus), °C 1430
560
Specific Heat Capacity, J/kg-K 480
890
Thermal Conductivity, W/m-K 25
120
Thermal Expansion, µm/m-K 11
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
30
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
99

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
10
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 2.3
7.8
Embodied Energy, MJ/kg 34
140
Embodied Water, L/kg 120
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
2.8 to 5.0
Resilience: Unit (Modulus of Resilience), kJ/m3 160
92 to 200
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
51
Strength to Weight: Axial, points 18
21 to 28
Strength to Weight: Bending, points 18
28 to 34
Thermal Diffusivity, mm2/s 6.7
50
Thermal Shock Resistance, points 16
9.2 to 12

Alloy Composition

Aluminum (Al), % 0 to 0.15
84.5 to 91.1
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17 to 19
0 to 0.35
Copper (Cu), % 0
1.0 to 2.0
Iron (Fe), % 77.1 to 82.8
0 to 1.0
Magnesium (Mg), % 0
0.2 to 0.6
Manganese (Mn), % 0 to 1.0
0.2 to 0.6
Nickel (Ni), % 0 to 0.5
0 to 0.25
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
7.5 to 8.5
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0.2 to 1.1
0 to 0.25
Zinc (Zn), % 0
0 to 1.5
Residuals, % 0
0 to 0.5