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EN AC-21100 Aluminum vs. ASTM A732 Cast Steel

EN AC-21100 aluminum belongs to the aluminum alloys classification, while ASTM A732 cast steel belongs to the iron alloys. 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 ASTM A732 cast steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 100 to 110
140 to 440
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 6.2 to 7.3
4.0 to 25
Fatigue Strength, MPa 79 to 87
230 to 750
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
72 to 73
Tensile Strength: Ultimate (UTS), MPa 340 to 350
460 to 1470
Tensile Strength: Yield (Proof), MPa 210 to 240
310 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 390
250 to 260
Maximum Temperature: Mechanical, °C 170
400 to 430
Melting Completion (Liquidus), °C 670
1440 to 1460
Melting Onset (Solidus), °C 550
1400 to 1420
Specific Heat Capacity, J/kg-K 880
470 to 480
Thermal Conductivity, W/m-K 130
39 to 50
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
7.1 to 7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 100
8.2 to 8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.0 to 3.8
Density, g/cm3 3.0
7.8 to 7.9
Embodied Carbon, kg CO2/kg material 8.0
1.4 to 1.7
Embodied Energy, MJ/kg 150
19 to 24
Embodied Water, L/kg 1150
47 to 54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 21
45 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 300 to 400
260 to 4770
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 31 to 33
16 to 52
Strength to Weight: Bending, points 36 to 37
17 to 37
Thermal Diffusivity, mm2/s 48
10 to 14
Thermal Shock Resistance, points 15
14 to 43