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7049 Aluminum vs. S21800 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while S21800 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 S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
210
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 6.2 to 7.0
40
Fatigue Strength, MPa 160 to 170
330
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 300 to 310
510
Tensile Strength: Ultimate (UTS), MPa 510 to 530
740
Tensile Strength: Yield (Proof), MPa 420 to 450
390

Thermal Properties

Latent Heat of Fusion, J/g 370
340
Maximum Temperature: Mechanical, °C 180
900
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 480
1310
Specific Heat Capacity, J/kg-K 860
500
Thermal Expansion, µm/m-K 23
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 3.1
7.5
Embodied Carbon, kg CO2/kg material 8.1
3.1
Embodied Energy, MJ/kg 140
45
Embodied Water, L/kg 1110
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
250
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
26
Strength to Weight: Axial, points 46 to 47
27
Strength to Weight: Bending, points 46 to 47
24
Thermal Shock Resistance, points 22 to 23
17

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0.1 to 0.22
16 to 18
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
59.1 to 65.4
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
7.0 to 9.0
Nickel (Ni), % 0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 0.25
3.5 to 4.5
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