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7129 Aluminum vs. S20910 Stainless Steel

7129 Aluminum belongs to the aluminum alloys classification, while S20910 stainless steel belongs to the iron alloys. There are 28 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 7129 Aluminum and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 9.0 to 9.1
14 to 39
Fatigue Strength, MPa 150 to 190
310 to 460
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
79
Shear Strength, MPa 250 to 260
500 to 570
Tensile Strength: Ultimate (UTS), MPa 430
780 to 940
Tensile Strength: Yield (Proof), MPa 380 to 390
430 to 810

Thermal Properties

Latent Heat of Fusion, J/g 380
300
Maximum Temperature: Mechanical, °C 180
1080
Melting Completion (Liquidus), °C 630
1420
Melting Onset (Solidus), °C 510
1380
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 150
13
Thermal Expansion, µm/m-K 24
16

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
22
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
4.8
Embodied Energy, MJ/kg 150
68
Embodied Water, L/kg 1150
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
120 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
460 to 1640
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 41
28 to 33
Strength to Weight: Bending, points 43 to 44
24 to 27
Thermal Diffusivity, mm2/s 58
3.6
Thermal Shock Resistance, points 19
17 to 21

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0 to 0.1
20.5 to 23.5
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
52.1 to 62.1
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
4.0 to 6.0
Molybdenum (Mo), % 0
1.5 to 3.0
Nickel (Ni), % 0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.15
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0.1 to 0.3
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0