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1100A Aluminum vs. ASTM A387 Grade 21 Steel

1100A aluminum belongs to the aluminum alloys classification, while ASTM A387 grade 21 steel belongs to the iron alloys. There are 30 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 1100A aluminum and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 4.5 to 34
21
Fatigue Strength, MPa 35 to 74
160 to 250
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
74
Shear Strength, MPa 59 to 99
310 to 370
Tensile Strength: Ultimate (UTS), MPa 89 to 170
500 to 590
Tensile Strength: Yield (Proof), MPa 29 to 150
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 400
260
Maximum Temperature: Mechanical, °C 170
480
Melting Completion (Liquidus), °C 640
1470
Melting Onset (Solidus), °C 640
1430
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 230
41
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 200
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
4.1
Density, g/cm3 2.7
7.9
Embodied Carbon, kg CO2/kg material 8.2
1.8
Embodied Energy, MJ/kg 150
23
Embodied Water, L/kg 1190
62

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.4 to 23
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 5.9 to 150
140 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 9.1 to 17
18 to 21
Strength to Weight: Bending, points 16 to 25
18 to 20
Thermal Diffusivity, mm2/s 93
11
Thermal Shock Resistance, points 4.0 to 7.6
14 to 17

Alloy Composition

Aluminum (Al), % 99 to 100
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0
2.8 to 3.3
Copper (Cu), % 0.050 to 0.2
0
Iron (Fe), % 0 to 1.0
94.4 to 96
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.050
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.15
0

Comparable Variants