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7049 Aluminum vs. S44635 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while S44635 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 S44635 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
240
Elastic (Young's, Tensile) Modulus, GPa 70
210
Elongation at Break, % 6.2 to 7.0
23
Fatigue Strength, MPa 160 to 170
390
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 27
81
Shear Strength, MPa 300 to 310
450
Tensile Strength: Ultimate (UTS), MPa 510 to 530
710
Tensile Strength: Yield (Proof), MPa 420 to 450
580

Thermal Properties

Latent Heat of Fusion, J/g 370
300
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
470
Thermal Conductivity, W/m-K 130
16
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
22
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.1
4.4
Embodied Energy, MJ/kg 140
62
Embodied Water, L/kg 1110
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
150
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
810
Stiffness to Weight: Axial, points 13
15
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 Diffusivity, mm2/s 51
4.4
Thermal Shock Resistance, points 22 to 23
23

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0.1 to 0.22
24.5 to 26
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
61.5 to 68.5
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0 to 1.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
3.5 to 4.5
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.25
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0.2 to 0.8
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0