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7049 Aluminum vs. EN 1.4903 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while EN 1.4903 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 EN 1.4903 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 6.2 to 7.0
20 to 21
Fatigue Strength, MPa 160 to 170
320 to 330
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
75
Shear Strength, MPa 300 to 310
420
Tensile Strength: Ultimate (UTS), MPa 510 to 530
670 to 680
Tensile Strength: Yield (Proof), MPa 420 to 450
500

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Maximum Temperature: Mechanical, °C 180
650
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
26
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 36
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 110
4.0

Otherwise Unclassified Properties

Base Metal Price, % relative 10
7.0
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.6
Embodied Energy, MJ/kg 140
36
Embodied Water, L/kg 1110
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
650
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 46 to 47
24
Strength to Weight: Bending, points 46 to 47
22
Thermal Diffusivity, mm2/s 51
7.0
Thermal Shock Resistance, points 22 to 23
23

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0 to 0.040
Carbon (C), % 0
0.080 to 0.12
Chromium (Cr), % 0.1 to 0.22
8.0 to 9.5
Copper (Cu), % 1.2 to 1.9
0 to 0.3
Iron (Fe), % 0 to 0.35
87.1 to 90.5
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.25
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.1
0
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0