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1070A Aluminum vs. SAE-AISI 9255 Steel

1070A aluminum belongs to the aluminum alloys classification, while SAE-AISI 9255 steel belongs to the iron alloys. 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 1070A aluminum and the bottom bar is SAE-AISI 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 18 to 40
200
Elastic (Young's, Tensile) Modulus, GPa 68
190
Elongation at Break, % 2.3 to 33
21
Fatigue Strength, MPa 17 to 51
270
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
72
Shear Strength, MPa 44 to 81
430
Tensile Strength: Ultimate (UTS), MPa 68 to 140
680
Tensile Strength: Yield (Proof), MPa 17 to 120
390

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Maximum Temperature: Mechanical, °C 170
400
Melting Completion (Liquidus), °C 640
1430
Melting Onset (Solidus), °C 640
1390
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 230
46
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 200
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
2.0
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 8.2
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1200
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.0 to 18
120
Resilience: Unit (Modulus of Resilience), kJ/m3 2.1 to 100
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 7.0 to 14
24
Strength to Weight: Bending, points 14 to 22
22
Thermal Diffusivity, mm2/s 94
13
Thermal Shock Resistance, points 3.1 to 6.3
21

Alloy Composition

Aluminum (Al), % 99.7 to 100
0
Carbon (C), % 0
0.51 to 0.59
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.25
96.2 to 97
Magnesium (Mg), % 0 to 0.030
0
Manganese (Mn), % 0 to 0.030
0.7 to 1.0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.2
1.8 to 2.2
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.030
0
Zinc (Zn), % 0 to 0.070
0