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ASTM A229 Spring Steel vs. 242.0 Aluminum

ASTM A229 spring steel belongs to the iron alloys classification, while 242.0 aluminum belongs to the aluminum alloys. There are 31 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 ASTM A229 spring steel and the bottom bar is 242.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
70 to 110
Elastic (Young's, Tensile) Modulus, GPa 190
73
Elongation at Break, % 14
0.5 to 1.5
Fatigue Strength, MPa 710 to 790
55 to 110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
27
Shear Strength, MPa 1020 to 1140
150 to 240
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
180 to 290
Tensile Strength: Yield (Proof), MPa 1100 to 1230
120 to 220

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 400
210
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1410
530
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 50
130 to 170
Thermal Expansion, µm/m-K 12
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
33 to 44
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
96 to 130

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
12
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.4
8.3
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 46
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
1.3 to 3.4
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
110 to 340
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 60 to 67
16 to 26
Strength to Weight: Bending, points 40 to 43
23 to 32
Thermal Diffusivity, mm2/s 14
50 to 62
Thermal Shock Resistance, points 54 to 60
8.0 to 13

Alloy Composition

Aluminum (Al), % 0
88.4 to 93.6
Carbon (C), % 0.55 to 0.85
0
Chromium (Cr), % 0
0 to 0.25
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 97.5 to 99
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0.3 to 1.2
0 to 0.35
Nickel (Ni), % 0
1.7 to 2.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.15 to 0.35
0 to 0.7
Sulfur (S), % 0 to 0.050
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 0.35
Residuals, % 0
0 to 0.15

Comparable Variants