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7049 Aluminum vs. S21600 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while S21600 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 S21600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
200
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 6.2 to 7.0
46
Fatigue Strength, MPa 160 to 170
360
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
79
Shear Strength, MPa 300 to 310
500
Tensile Strength: Ultimate (UTS), MPa 510 to 530
710
Tensile Strength: Yield (Proof), MPa 420 to 450
390

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 180
990
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 480
1380
Specific Heat Capacity, J/kg-K 860
480
Thermal Expansion, µm/m-K 23
17

Otherwise Unclassified Properties

Base Metal Price, % relative 10
17
Density, g/cm3 3.1
7.7
Embodied Carbon, kg CO2/kg material 8.1
3.6
Embodied Energy, MJ/kg 140
50
Embodied Water, L/kg 1110
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
270
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 46 to 47
25
Strength to Weight: Bending, points 46 to 47
23
Thermal Shock Resistance, points 22 to 23
15

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0.1 to 0.22
17.5 to 22
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
57.6 to 67.8
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
7.5 to 9.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.25
0 to 0.75
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