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ASTM A227 Spring Steel vs. 4104 Aluminum

ASTM A227 spring steel belongs to the iron alloys classification, while 4104 aluminum belongs to the aluminum 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 ASTM A227 spring steel and the bottom bar is 4104 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
71
Elongation at Break, % 12
2.4
Fatigue Strength, MPa 900 to 1160
42
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
27
Shear Strength, MPa 1030 to 1330
63
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
110
Tensile Strength: Yield (Proof), MPa 1430 to 1850
60

Thermal Properties

Latent Heat of Fusion, J/g 250
540
Maximum Temperature: Mechanical, °C 400
160
Melting Completion (Liquidus), °C 1450
600
Melting Onset (Solidus), °C 1410
560
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 52
130
Thermal Expansion, µm/m-K 12
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
120

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
9.5
Density, g/cm3 7.8
2.6
Embodied Carbon, kg CO2/kg material 1.4
8.0
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 46
1080

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
2.3
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
54
Strength to Weight: Axial, points 61 to 79
12
Strength to Weight: Bending, points 41 to 48
20
Thermal Diffusivity, mm2/s 14
58
Thermal Shock Resistance, points 55 to 71
5.1

Alloy Composition

Aluminum (Al), % 0
85.8 to 90
Bismuth (Bi), % 0
0.020 to 0.2
Carbon (C), % 0.45 to 0.85
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 97.4 to 99.1
0 to 0.8
Magnesium (Mg), % 0
1.0 to 2.0
Manganese (Mn), % 0.3 to 1.3
0 to 0.1
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.15 to 0.35
9.0 to 10.5
Sulfur (S), % 0 to 0.050
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15