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S21904 Stainless Steel vs. EN AC-21200 Aluminum

S21904 stainless steel belongs to the iron alloys classification, while EN AC-21200 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 S21904 stainless steel and the bottom bar is EN AC-21200 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
120 to 130
Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 17 to 51
3.9 to 6.2
Fatigue Strength, MPa 380 to 550
110 to 130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
27
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
410 to 440
Tensile Strength: Yield (Proof), MPa 390 to 910
270 to 360

Thermal Properties

Latent Heat of Fusion, J/g 290
390
Maximum Temperature: Mechanical, °C 980
170
Melting Completion (Liquidus), °C 1400
660
Melting Onset (Solidus), °C 1350
550
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 14
130
Thermal Expansion, µm/m-K 17
23

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 15
10
Density, g/cm3 7.7
3.0
Embodied Carbon, kg CO2/kg material 3.0
8.0
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
16 to 22
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
500 to 930
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 25 to 36
38 to 40
Strength to Weight: Bending, points 23 to 29
41 to 43
Thermal Diffusivity, mm2/s 3.8
49
Thermal Shock Resistance, points 15 to 21
18 to 19

Alloy Composition

Aluminum (Al), % 0
93.3 to 95.7
Carbon (C), % 0 to 0.040
0
Chromium (Cr), % 19 to 21.5
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 59.5 to 67.4
0 to 0.2
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 0
0.15 to 0.5
Manganese (Mn), % 8.0 to 10
0.2 to 0.5
Nickel (Ni), % 5.5 to 7.5
0 to 0.050
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
0 to 0.030
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.1