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2124 Aluminum vs. AISI 302 Stainless Steel

2124 aluminum belongs to the aluminum alloys classification, while AISI 302 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 2124 aluminum and the bottom bar is AISI 302 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 5.7
4.5 to 46
Fatigue Strength, MPa 130
210 to 520
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 280
400 to 830
Tensile Strength: Ultimate (UTS), MPa 490
580 to 1430
Tensile Strength: Yield (Proof), MPa 430
230 to 1100

Thermal Properties

Latent Heat of Fusion, J/g 390
280
Maximum Temperature: Mechanical, °C 190
710
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 500
1400
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 23
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.0
Embodied Energy, MJ/kg 150
42
Embodied Water, L/kg 1150
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
59 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 1290
140 to 3070
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 45
21 to 51
Strength to Weight: Bending, points 46
20 to 36
Thermal Diffusivity, mm2/s 58
4.4
Thermal Shock Resistance, points 21
12 to 31

Alloy Composition

Aluminum (Al), % 91.3 to 94.7
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0 to 0.1
17 to 19
Copper (Cu), % 3.8 to 4.9
0
Iron (Fe), % 0 to 0.3
67.9 to 75
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0.3 to 0.9
0 to 2.0
Nickel (Ni), % 0
8.0 to 10
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.2
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0