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ASTM A225 Steel vs. 7178 Aluminum

ASTM A225 steel belongs to the iron alloys classification, while 7178 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 A225 steel and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
71
Elongation at Break, % 21 to 23
4.5 to 12
Fatigue Strength, MPa 330 to 390
120 to 210
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
27
Shear Strength, MPa 390 to 520
140 to 380
Tensile Strength: Ultimate (UTS), MPa 620 to 830
240 to 640
Tensile Strength: Yield (Proof), MPa 460 to 550
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 250
370
Maximum Temperature: Mechanical, °C 400
180
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
480
Specific Heat Capacity, J/kg-K 470
860
Thermal Conductivity, W/m-K 52
130
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
31
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
91

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.8
8.2
Embodied Energy, MJ/kg 24 to 25
150
Embodied Water, L/kg 48
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 170
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 580 to 820
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 22 to 29
21 to 58
Strength to Weight: Bending, points 21 to 25
28 to 54
Thermal Diffusivity, mm2/s 14
47
Thermal Shock Resistance, points 18 to 24
10 to 28

Comparable Variants