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AISI 309 Stainless Steel vs. 7049A Aluminum

AISI 309 stainless steel belongs to the iron alloys classification, while 7049A aluminum belongs to the aluminum alloys. There are 30 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 7049A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 34 to 47
5.0 to 5.7
Fatigue Strength, MPa 250 to 280
180
Poisson's Ratio 0.27
0.32
Shear Modulus, GPa 78
27
Shear Strength, MPa 420 to 470
340 to 350
Tensile Strength: Ultimate (UTS), MPa 600 to 710
580 to 590
Tensile Strength: Yield (Proof), MPa 260 to 350
500 to 530

Thermal Properties

Latent Heat of Fusion, J/g 290
370
Maximum Temperature: Mechanical, °C 980
200
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1400
430
Specific Heat Capacity, J/kg-K 480
850
Thermal Conductivity, W/m-K 16
130
Thermal Expansion, µm/m-K 15
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
40
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
120

Otherwise Unclassified Properties

Base Metal Price, % relative 19
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 3.6
8.2
Embodied Energy, MJ/kg 51
150
Embodied Water, L/kg 170
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
28 to 32
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
1800 to 1990
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
44
Strength to Weight: Axial, points 21 to 25
52 to 53
Strength to Weight: Bending, points 20 to 23
50 to 51
Thermal Diffusivity, mm2/s 4.3
50
Thermal Shock Resistance, points 14 to 16
25

Alloy Composition

Aluminum (Al), % 0
84.6 to 89.5
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 22 to 24
0.050 to 0.25
Copper (Cu), % 0
1.2 to 1.9
Iron (Fe), % 58 to 66
0 to 0.5
Magnesium (Mg), % 0
2.1 to 3.1
Manganese (Mn), % 0 to 2.0
0 to 0.5
Nickel (Ni), % 12 to 15
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 0.4
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
7.2 to 8.4
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15