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1050A Aluminum vs. AISI 431 Stainless Steel

1050A aluminum belongs to the aluminum alloys classification, while AISI 431 stainless steel belongs to the iron alloys. There are 31 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 1050A aluminum and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 20 to 45
250
Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 1.1 to 33
15 to 17
Fatigue Strength, MPa 22 to 55
430 to 610
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 44 to 97
550 to 840
Tensile Strength: Ultimate (UTS), MPa 68 to 170
890 to 1380
Tensile Strength: Yield (Proof), MPa 22 to 150
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Maximum Temperature: Mechanical, °C 170
850
Melting Completion (Liquidus), °C 660
1510
Melting Onset (Solidus), °C 650
1450
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 230
26
Thermal Expansion, µm/m-K 24
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 59
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 200
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
9.0
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 8.2
2.2
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 1200
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 1.9 to 19
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 3.7 to 160
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 6.9 to 18
32 to 50
Strength to Weight: Bending, points 14 to 25
27 to 36
Thermal Diffusivity, mm2/s 94
7.0
Thermal Shock Resistance, points 3.0 to 7.6
28 to 43

Alloy Composition

Aluminum (Al), % 99.5 to 100
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0
15 to 17
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.4
78.2 to 83.8
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0 to 0.050
0 to 1.0
Nickel (Ni), % 0
1.3 to 2.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.25
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Zinc (Zn), % 0 to 0.070
0