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380.0 Aluminum vs. S21904 Stainless Steel

380.0 aluminum belongs to the aluminum alloys classification, while S21904 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 380.0 aluminum and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 80
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 74
200
Elongation at Break, % 3.0
17 to 51
Fatigue Strength, MPa 140
380 to 550
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
78
Shear Strength, MPa 190
510 to 620
Tensile Strength: Ultimate (UTS), MPa 320
700 to 1000
Tensile Strength: Yield (Proof), MPa 160
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 510
290
Maximum Temperature: Mechanical, °C 170
980
Melting Completion (Liquidus), °C 590
1400
Melting Onset (Solidus), °C 540
1350
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 100
14
Thermal Expansion, µm/m-K 22
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 83
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 2.9
7.7
Embodied Carbon, kg CO2/kg material 7.5
3.0
Embodied Energy, MJ/kg 140
43
Embodied Water, L/kg 1040
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 8.0
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 170
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 48
25
Strength to Weight: Axial, points 31
25 to 36
Strength to Weight: Bending, points 36
23 to 29
Thermal Diffusivity, mm2/s 40
3.8
Thermal Shock Resistance, points 14
15 to 21

Alloy Composition

Aluminum (Al), % 79.6 to 89.5
0
Carbon (C), % 0
0 to 0.040
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 0 to 2.0
59.5 to 67.4
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
8.0 to 10
Nickel (Ni), % 0 to 0.5
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 7.5 to 9.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 0 to 0.35
0
Zinc (Zn), % 0 to 3.0
0
Residuals, % 0 to 0.5
0