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AISI 309 Stainless Steel vs. 3003 Aluminum

AISI 309 stainless steel belongs to the iron alloys classification, while 3003 aluminum belongs to the aluminum alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 309 stainless steel and the bottom bar is 3003 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 210
28 to 65
Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 34 to 47
1.1 to 28
Fatigue Strength, MPa 250 to 280
39 to 90
Poisson's Ratio 0.27
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 420 to 470
68 to 130
Tensile Strength: Ultimate (UTS), MPa 600 to 710
110 to 240
Tensile Strength: Yield (Proof), MPa 260 to 350
40 to 210

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 980
180
Melting Completion (Liquidus), °C 1450
650
Melting Onset (Solidus), °C 1400
640
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 16
180
Thermal Expansion, µm/m-K 15
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
44
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
140

Otherwise Unclassified Properties

Base Metal Price, % relative 19
9.5
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 3.6
8.1
Embodied Energy, MJ/kg 51
150
Embodied Water, L/kg 170
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
0.95 to 63
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
11 to 300
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 21 to 25
11 to 24
Strength to Weight: Bending, points 20 to 23
18 to 30
Thermal Diffusivity, mm2/s 4.3
71
Thermal Shock Resistance, points 14 to 16
4.7 to 10

Alloy Composition

Aluminum (Al), % 0
96.8 to 99
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 22 to 24
0
Copper (Cu), % 0
0.050 to 0.2
Iron (Fe), % 58 to 66
0 to 0.7
Manganese (Mn), % 0 to 2.0
1.0 to 1.5
Nickel (Ni), % 12 to 15
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 0.6
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15