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238.0 Aluminum vs. ASTM A229 Spring Steel

238.0 aluminum belongs to the aluminum alloys classification, while ASTM A229 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 238.0 aluminum and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 76
190
Elongation at Break, % 1.5
14
Fatigue Strength, MPa 110
710 to 790
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
72
Tensile Strength: Ultimate (UTS), MPa 210
1690 to 1890
Tensile Strength: Yield (Proof), MPa 170
1100 to 1230

Thermal Properties

Latent Heat of Fusion, J/g 430
250
Maximum Temperature: Mechanical, °C 170
400
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 510
1410
Specific Heat Capacity, J/kg-K 840
470
Thermal Conductivity, W/m-K 100
50
Thermal Expansion, µm/m-K 21
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 67
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.8
Density, g/cm3 3.4
7.8
Embodied Carbon, kg CO2/kg material 7.4
1.4
Embodied Energy, MJ/kg 140
19
Embodied Water, L/kg 1040
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.9
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 180
3260 to 4080
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 42
24
Strength to Weight: Axial, points 17
60 to 67
Strength to Weight: Bending, points 23
40 to 43
Thermal Diffusivity, mm2/s 37
14
Thermal Shock Resistance, points 9.1
54 to 60

Alloy Composition

Aluminum (Al), % 81.9 to 84.9
0
Carbon (C), % 0
0.55 to 0.85
Copper (Cu), % 9.5 to 10.5
0
Iron (Fe), % 1.0 to 1.5
97.5 to 99
Magnesium (Mg), % 0 to 0.25
0
Manganese (Mn), % 0
0.3 to 1.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 3.6 to 4.4
0.15 to 0.35
Sulfur (S), % 0
0 to 0.050
Zinc (Zn), % 1.0 to 1.5
0