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7003 Aluminum vs. ASTM A227 Spring Steel

7003 aluminum belongs to the aluminum alloys classification, while ASTM A227 spring steel belongs to the iron alloys. There are 29 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 7003 aluminum and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 11
12
Fatigue Strength, MPa 130 to 150
900 to 1160
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
72
Shear Strength, MPa 210 to 230
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 350 to 390
1720 to 2220
Tensile Strength: Yield (Proof), MPa 300 to 310
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 200
400
Melting Completion (Liquidus), °C 630
1450
Melting Onset (Solidus), °C 510
1410
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 150
52
Thermal Expansion, µm/m-K 24
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
1.8
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 1140
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 41
200 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 33 to 37
61 to 79
Strength to Weight: Bending, points 37 to 40
41 to 48
Thermal Diffusivity, mm2/s 59
14
Thermal Shock Resistance, points 15 to 17
55 to 71

Alloy Composition

Aluminum (Al), % 90.6 to 94.5
0
Carbon (C), % 0
0.45 to 0.85
Chromium (Cr), % 0 to 0.2
0
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.35
97.4 to 99.1
Magnesium (Mg), % 0.5 to 1.0
0
Manganese (Mn), % 0 to 0.3
0.3 to 1.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.3
0.15 to 0.35
Sulfur (S), % 0
0 to 0.050
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.0 to 6.5
0
Zirconium (Zr), % 0.050 to 0.25
0
Residuals, % 0 to 0.15
0

Comparable Variants