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7049 Aluminum vs. EN 1.4971 Stainless Steel

7049 aluminum belongs to the aluminum alloys classification, while EN 1.4971 stainless steel belongs to the iron alloys. There are 29 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 1.4971 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
34
Fatigue Strength, MPa 160 to 170
270
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
81
Shear Strength, MPa 300 to 310
530
Tensile Strength: Ultimate (UTS), MPa 510 to 530
800
Tensile Strength: Yield (Proof), MPa 420 to 450
340

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
1410
Specific Heat Capacity, J/kg-K 860
450
Thermal Conductivity, W/m-K 130
13
Thermal Expansion, µm/m-K 23
15

Otherwise Unclassified Properties

Base Metal Price, % relative 10
70
Density, g/cm3 3.1
8.4
Embodied Carbon, kg CO2/kg material 8.1
7.6
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 1110
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31 to 34
220
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 1440
280
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 46 to 47
26
Strength to Weight: Bending, points 46 to 47
23
Thermal Diffusivity, mm2/s 51
3.4
Thermal Shock Resistance, points 22 to 23
19

Alloy Composition

Aluminum (Al), % 85.7 to 89.5
0
Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0.1 to 0.22
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.35
24.3 to 37.1
Magnesium (Mg), % 2.0 to 2.9
0
Manganese (Mn), % 0 to 0.2
0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.25
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 7.2 to 8.2
0
Residuals, % 0 to 0.15
0