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5251 Aluminum vs. ACI-ASTM CB30 Steel

5251 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CB30 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 5251 aluminum and the bottom bar is ACI-ASTM CB30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 44 to 79
210
Elastic (Young's, Tensile) Modulus, GPa 68
200
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 180 to 280
500
Tensile Strength: Yield (Proof), MPa 67 to 250
230

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 180
940
Melting Completion (Liquidus), °C 650
1430
Melting Onset (Solidus), °C 610
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 150
21
Thermal Expansion, µm/m-K 24
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 120
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 8.5
2.3
Embodied Energy, MJ/kg 150
33
Embodied Water, L/kg 1180
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 33 to 450
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 18 to 29
18
Strength to Weight: Bending, points 26 to 35
18
Thermal Diffusivity, mm2/s 61
5.6
Thermal Shock Resistance, points 7.9 to 13
17

Alloy Composition

Aluminum (Al), % 95.5 to 98.2
0
Carbon (C), % 0
0 to 0.3
Chromium (Cr), % 0 to 0.15
18 to 21
Copper (Cu), % 0 to 0.15
0 to 1.2
Iron (Fe), % 0 to 0.5
72.9 to 82
Magnesium (Mg), % 1.7 to 2.4
0
Manganese (Mn), % 0.1 to 0.5
0 to 1.0
Nickel (Ni), % 0
0 to 2.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0