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7129 Aluminum vs. ASTM A232 Spring Steel

7129 Aluminum belongs to the aluminum alloys classification, while ASTM A232 spring steel belongs to the iron alloys. There are 29 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 7129 Aluminum and the bottom bar is ASTM A232 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.0 to 9.1
14
Fatigue Strength, MPa 150 to 190
1040
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 250 to 260
1090
Tensile Strength: Ultimate (UTS), MPa 430
1790
Tensile Strength: Yield (Proof), MPa 380 to 390
1610

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 180
420
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 510
1410
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
52
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.3
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
2.0
Embodied Energy, MJ/kg 150
28
Embodied Water, L/kg 1150
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
250
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 41
64
Strength to Weight: Bending, points 43 to 44
42
Thermal Diffusivity, mm2/s 58
14
Thermal Shock Resistance, points 19
53

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0.48 to 0.53
Chromium (Cr), % 0 to 0.1
0.8 to 1.1
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
96.8 to 97.7
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0.7 to 0.9
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.15
0.15 to 0.35
Sulfur (S), % 0
0 to 0.035
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0.15 to 0.3
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0