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7049 Aluminum vs. S31727 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while S31727 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 7049 aluminum and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
190
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 6.2 to 7.0
40
Fatigue Strength, MPa 160 to 170
240
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
78
Shear Strength, MPa 300 to 310
430
Tensile Strength: Ultimate (UTS), MPa 510 to 530
630
Tensile Strength: Yield (Proof), MPa 420 to 450
270

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 180
1010
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 480
1390
Specific Heat Capacity, J/kg-K 860
470
Thermal Expansion, µm/m-K 23
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
24
Density, g/cm3 3.1
8.0
Embodied Carbon, kg CO2/kg material 8.1
4.7
Embodied Energy, MJ/kg 140
64
Embodied Water, L/kg 1110
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
200
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 46 to 47
22
Strength to Weight: Bending, points 46 to 47
20
Thermal Shock Resistance, points 22 to 23
14

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.1 to 0.22
17.5 to 19
Copper (Cu), % 1.2 to 1.9
2.8 to 4.0
Iron (Fe), % 0 to 0.35
53.7 to 61.3
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0 to 1.0
Molybdenum (Mo), % 0
3.8 to 4.5
Nickel (Ni), % 0
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.25
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0