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EN AC-21100 Aluminum vs. S20910 Stainless Steel

EN AC-21100 aluminum belongs to the aluminum alloys classification, while S20910 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 EN AC-21100 aluminum and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 100 to 110
230 to 290
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 6.2 to 7.3
14 to 39
Fatigue Strength, MPa 79 to 87
310 to 460
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
79
Tensile Strength: Ultimate (UTS), MPa 340 to 350
780 to 940
Tensile Strength: Yield (Proof), MPa 210 to 240
430 to 810

Thermal Properties

Latent Heat of Fusion, J/g 390
300
Maximum Temperature: Mechanical, °C 170
1080
Melting Completion (Liquidus), °C 670
1420
Melting Onset (Solidus), °C 550
1380
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 130
13
Thermal Expansion, µm/m-K 23
16

Otherwise Unclassified Properties

Base Metal Price, % relative 11
22
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.0
4.8
Embodied Energy, MJ/kg 150
68
Embodied Water, L/kg 1150
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 21
120 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 400
460 to 1640
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 31 to 33
28 to 33
Strength to Weight: Bending, points 36 to 37
24 to 27
Thermal Diffusivity, mm2/s 48
3.6
Thermal Shock Resistance, points 15
17 to 21

Alloy Composition

Aluminum (Al), % 93.4 to 95.7
0
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0
20.5 to 23.5
Copper (Cu), % 4.2 to 5.2
0
Iron (Fe), % 0 to 0.19
52.1 to 62.1
Manganese (Mn), % 0 to 0.55
4.0 to 6.0
Molybdenum (Mo), % 0
1.5 to 3.0
Nickel (Ni), % 0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.18
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0.15 to 0.3
0
Vanadium (V), % 0
0.1 to 0.3
Zinc (Zn), % 0 to 0.070
0
Residuals, % 0 to 0.1
0