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7049 Aluminum vs. S44735 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while S44735 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, 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 S44735 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
220
Elastic (Young's, Tensile) Modulus, GPa 70
210
Elongation at Break, % 6.2 to 7.0
21
Fatigue Strength, MPa 160 to 170
300
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 27
82
Shear Strength, MPa 300 to 310
390
Tensile Strength: Ultimate (UTS), MPa 510 to 530
630
Tensile Strength: Yield (Proof), MPa 420 to 450
460

Thermal Properties

Latent Heat of Fusion, J/g 370
310
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 480
1420
Specific Heat Capacity, J/kg-K 860
480
Thermal Expansion, µm/m-K 23
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
21
Density, g/cm3 3.1
7.7
Embodied Carbon, kg CO2/kg material 8.1
4.4
Embodied Energy, MJ/kg 140
61
Embodied Water, L/kg 1110
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
520
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 45
26
Strength to Weight: Axial, points 46 to 47
23
Strength to Weight: Bending, points 46 to 47
21
Thermal Shock Resistance, points 22 to 23
20

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.1 to 0.22
28 to 30
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
60.7 to 68.4
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0 to 1.0
Molybdenum (Mo), % 0
3.6 to 4.2
Nickel (Ni), % 0
0 to 1.0
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.25
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0.2 to 1.0
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0