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ASTM A148 Cast Steel vs. 7178 Aluminum

ASTM A148 cast steel belongs to the iron alloys classification, while 7178 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 A148 cast 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, % 5.7 to 25
4.5 to 12
Fatigue Strength, MPa 280 to 670
120 to 210
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 630 to 1300
240 to 640
Tensile Strength: Yield (Proof), MPa 390 to 1160
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 250
370
Maximum Temperature: Mechanical, °C 400 to 430
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 37 to 47
130
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3 to 7.5
31
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3 to 8.6
91

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3 to 3.3
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
8.2
Embodied Energy, MJ/kg 20 to 22
150
Embodied Water, L/kg 48 to 53
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 150
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 400 to 3570
110 to 2220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 22 to 46
21 to 58
Strength to Weight: Bending, points 21 to 34
28 to 54
Thermal Diffusivity, mm2/s 9.9 to 13
47
Thermal Shock Resistance, points 18 to 38
10 to 28

Comparable Variants