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308.0 Aluminum vs. S21800 Stainless Steel

308.0 aluminum belongs to the aluminum alloys classification, while S21800 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (9, 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 S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
210
Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 2.0
40
Fatigue Strength, MPa 89
330
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 150
510
Tensile Strength: Ultimate (UTS), MPa 190
740
Tensile Strength: Yield (Proof), MPa 110
390

Thermal Properties

Latent Heat of Fusion, J/g 470
340
Maximum Temperature: Mechanical, °C 170
900
Melting Completion (Liquidus), °C 620
1360
Melting Onset (Solidus), °C 540
1310
Specific Heat Capacity, J/kg-K 870
500
Thermal Expansion, µm/m-K 20
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 2.9
7.5
Embodied Carbon, kg CO2/kg material 7.7
3.1
Embodied Energy, MJ/kg 140
45
Embodied Water, L/kg 1080
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.3
250
Resilience: Unit (Modulus of Resilience), kJ/m3 83
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 47
26
Strength to Weight: Axial, points 18
27
Strength to Weight: Bending, points 25
24
Thermal Shock Resistance, points 9.2
17

Alloy Composition

Aluminum (Al), % 85.7 to 91
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
16 to 18
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 0 to 1.0
59.1 to 65.4
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
7.0 to 9.0
Nickel (Ni), % 0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 5.0 to 6.0
3.5 to 4.5
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