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204.0 Aluminum vs. S21900 Stainless Steel

204.0 aluminum belongs to the aluminum alloys classification, while S21900 stainless steel belongs to the iron alloys. There are 30 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 204.0 aluminum and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 90 to 120
220
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 5.7 to 7.8
50
Fatigue Strength, MPa 63 to 77
380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
78
Tensile Strength: Ultimate (UTS), MPa 230 to 340
710
Tensile Strength: Yield (Proof), MPa 180 to 220
390

Thermal Properties

Latent Heat of Fusion, J/g 390
290
Maximum Temperature: Mechanical, °C 170
980
Melting Completion (Liquidus), °C 650
1400
Melting Onset (Solidus), °C 580
1350
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 120
14
Thermal Expansion, µm/m-K 19
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 29 to 34
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 87 to 100
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 11
15
Density, g/cm3 3.0
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.0
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1150
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12 to 23
300
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 350
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 21 to 31
26
Strength to Weight: Bending, points 28 to 36
23
Thermal Diffusivity, mm2/s 46
3.8
Thermal Shock Resistance, points 12 to 18
15

Alloy Composition

Aluminum (Al), % 93.4 to 95.5
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 4.2 to 5.0
0
Iron (Fe), % 0 to 0.35
59.4 to 67.4
Magnesium (Mg), % 0.15 to 0.35
0
Manganese (Mn), % 0 to 0.1
8.0 to 10
Nickel (Ni), % 0 to 0.050
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 0 to 0.050
0
Titanium (Ti), % 0.15 to 0.3
0
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.15
0