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7049 Aluminum vs. ASTM A588 Steel

7049 aluminum belongs to the aluminum alloys classification, while ASTM A588 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 7049 aluminum and the bottom bar is ASTM A588 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 6.2 to 7.0
22
Fatigue Strength, MPa 160 to 170
270
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 300 to 310
350
Tensile Strength: Ultimate (UTS), MPa 510 to 530
550
Tensile Strength: Yield (Proof), MPa 420 to 450
390

Thermal Properties

Latent Heat of Fusion, J/g 370
250 to 260
Maximum Temperature: Mechanical, °C 180
410
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 480
1410 to 1420
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
43 to 44
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.3 to 2.5
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.5 to 1.6
Embodied Energy, MJ/kg 140
20 to 22
Embodied Water, L/kg 1110
50 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 46 to 47
20
Strength to Weight: Bending, points 46 to 47
19
Thermal Diffusivity, mm2/s 51
12
Thermal Shock Resistance, points 22 to 23
16