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7049 Aluminum vs. S44537 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while S44537 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 S44537 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
180
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 6.2 to 7.0
21
Fatigue Strength, MPa 160 to 170
230
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 27
79
Shear Strength, MPa 300 to 310
320
Tensile Strength: Ultimate (UTS), MPa 510 to 530
510
Tensile Strength: Yield (Proof), MPa 420 to 450
360

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 180
1000
Melting Completion (Liquidus), °C 640
1480
Melting Onset (Solidus), °C 480
1430
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 130
21
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 110
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 10
19
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.1
3.4
Embodied Energy, MJ/kg 140
50
Embodied Water, L/kg 1110
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
95
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
320
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 46 to 47
18
Strength to Weight: Bending, points 46 to 47
18
Thermal Diffusivity, mm2/s 51
5.6
Thermal Shock Resistance, points 22 to 23
17

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0 to 0.1
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.1 to 0.22
20 to 24
Copper (Cu), % 1.2 to 1.9
0 to 0.5
Iron (Fe), % 0 to 0.35
69 to 78.6
Lanthanum (La), % 0
0.040 to 0.2
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0 to 0.8
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0
0 to 0.040
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0 to 0.25
0.1 to 0.6
Sulfur (S), % 0
0 to 0.0060
Titanium (Ti), % 0 to 0.1
0.020 to 0.2
Tungsten (W), % 0
1.0 to 3.0
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0