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ASTM A302 Alloy Steel vs. 4147 Aluminum

ASTM A302 alloy steel belongs to the iron alloys classification, while 4147 aluminum belongs to the aluminum alloys. There are 30 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 A302 alloy steel and the bottom bar is 4147 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
72
Elongation at Break, % 20 to 23
3.3
Fatigue Strength, MPa 250 to 280
42
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Shear Strength, MPa 370 to 390
63
Tensile Strength: Ultimate (UTS), MPa 590 to 620
110
Tensile Strength: Yield (Proof), MPa 350 to 390
59

Thermal Properties

Latent Heat of Fusion, J/g 250
570
Maximum Temperature: Mechanical, °C 410
160
Melting Completion (Liquidus), °C 1460
580
Melting Onset (Solidus), °C 1420
560
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 39 to 51
130
Thermal Expansion, µm/m-K 13
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2 to 7.4
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2 to 8.4
120

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4 to 3.0
9.5
Density, g/cm3 7.8 to 7.9
2.5
Embodied Carbon, kg CO2/kg material 1.5 to 1.6
7.7
Embodied Energy, MJ/kg 20 to 21
140
Embodied Water, L/kg 48 to 50
1050

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
3.1
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 410
24
Stiffness to Weight: Axial, points 13
16
Stiffness to Weight: Bending, points 24
55
Strength to Weight: Axial, points 21 to 22
12
Strength to Weight: Bending, points 20 to 21
20
Thermal Diffusivity, mm2/s 10 to 14
58
Thermal Shock Resistance, points 17 to 18
5.2