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308.0 Aluminum vs. AISI 309H Stainless Steel

308.0 aluminum belongs to the aluminum alloys classification, while AISI 309H stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 308.0 aluminum and the bottom bar is AISI 309H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
190
Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.0
40
Fatigue Strength, MPa 89
200
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 27
78
Shear Strength, MPa 150
400
Tensile Strength: Ultimate (UTS), MPa 190
580
Tensile Strength: Yield (Proof), MPa 110
230

Thermal Properties

Latent Heat of Fusion, J/g 470
290
Maximum Temperature: Mechanical, °C 170
1080
Melting Completion (Liquidus), °C 620
1420
Melting Onset (Solidus), °C 540
1370
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140
15
Thermal Expansion, µm/m-K 20
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
19
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 7.7
3.6
Embodied Energy, MJ/kg 140
51
Embodied Water, L/kg 1080
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.3
190
Resilience: Unit (Modulus of Resilience), kJ/m3 83
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 18
21
Strength to Weight: Bending, points 25
20
Thermal Diffusivity, mm2/s 55
4.0
Thermal Shock Resistance, points 9.2
13

Alloy Composition

Aluminum (Al), % 85.7 to 91
0
Carbon (C), % 0
0.040 to 0.1
Chromium (Cr), % 0
22 to 24
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 0 to 1.0
58.1 to 66
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
0 to 2.0
Nickel (Ni), % 0
12 to 15
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 5.0 to 6.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.5
0