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ASTM A231 Spring Steel vs. 772.0 Aluminum

ASTM A231 spring steel belongs to the iron alloys classification, while 772.0 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, 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 ASTM A231 spring steel and the bottom bar is 772.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 14
6.3 to 8.4
Fatigue Strength, MPa 1000
94 to 160
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
26
Tensile Strength: Ultimate (UTS), MPa 1790
260 to 320
Tensile Strength: Yield (Proof), MPa 1570
220 to 250

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 420
180
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1410
580
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 52
150
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
35
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
110

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
9.5
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 2.0
8.0
Embodied Energy, MJ/kg 28
150
Embodied Water, L/kg 51
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
16 to 25
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 64
25 to 31
Strength to Weight: Bending, points 42
31 to 36
Thermal Diffusivity, mm2/s 14
58
Thermal Shock Resistance, points 53
11 to 14

Alloy Composition

Aluminum (Al), % 0
91.2 to 93.2
Carbon (C), % 0.48 to 0.53
0
Chromium (Cr), % 0.8 to 1.1
0.060 to 0.2
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 96.7 to 97.7
0 to 0.15
Magnesium (Mg), % 0
0.6 to 0.8
Manganese (Mn), % 0.7 to 0.9
0 to 0.1
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.15 to 0.35
0 to 0.15
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0.1 to 0.2
Vanadium (V), % 0.15 to 0.3
0
Zinc (Zn), % 0
6.0 to 7.0
Residuals, % 0
0 to 0.15