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7049 Aluminum vs. AISI 304 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while AISI 304 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 AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170 to 360
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 6.2 to 7.0
8.0 to 43
Fatigue Strength, MPa 160 to 170
210 to 440
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 300 to 310
400 to 690
Tensile Strength: Ultimate (UTS), MPa 510 to 530
580 to 1180
Tensile Strength: Yield (Proof), MPa 420 to 450
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 370
290
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
16
Thermal Expansion, µm/m-K 23
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.1
3.0
Embodied Energy, MJ/kg 140
43
Embodied Water, L/kg 1110
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
140 to 1870
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 46 to 47
21 to 42
Strength to Weight: Bending, points 46 to 47
20 to 32
Thermal Diffusivity, mm2/s 51
4.2
Thermal Shock Resistance, points 22 to 23
12 to 25

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0.1 to 0.22
18 to 20
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
66.5 to 74
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0 to 2.0
Nickel (Ni), % 0
8.0 to 10.5
Nitrogen (N), % 0
0 to 0.1
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