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7049 Aluminum vs. S40975 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while S40975 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 S40975 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 6.2 to 7.0
22
Fatigue Strength, MPa 160 to 170
210
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 300 to 310
290
Tensile Strength: Ultimate (UTS), MPa 510 to 530
460
Tensile Strength: Yield (Proof), MPa 420 to 450
310

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Maximum Temperature: Mechanical, °C 180
710
Melting Completion (Liquidus), °C 640
1450
Melting Onset (Solidus), °C 480
1400
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 130
26
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 110
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
6.5
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.0
Embodied Energy, MJ/kg 140
28
Embodied Water, L/kg 1110
95

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
93
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
250
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 46 to 47
17
Strength to Weight: Bending, points 46 to 47
17
Thermal Diffusivity, mm2/s 51
7.0
Thermal Shock Resistance, points 22 to 23
17

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.1 to 0.22
10.5 to 11.7
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
84.4 to 89
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0 to 1.0
Nickel (Ni), % 0
0.5 to 1.0
Nitrogen (N), % 0
0 to 0.030
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 to 0.75
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0