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7178 Aluminum vs. EN 1.4971 Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while EN 1.4971 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 7178 aluminum and the bottom bar is EN 1.4971 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
210
Elongation at Break, % 4.5 to 12
34
Fatigue Strength, MPa 120 to 210
270
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 27
81
Shear Strength, MPa 140 to 380
530
Tensile Strength: Ultimate (UTS), MPa 240 to 640
800
Tensile Strength: Yield (Proof), MPa 120 to 560
340

Thermal Properties

Latent Heat of Fusion, J/g 370
300
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 630
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 8.2
7.6
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 1110
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
220
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
280
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 21 to 58
26
Strength to Weight: Bending, points 28 to 54
23
Thermal Diffusivity, mm2/s 47
3.4
Thermal Shock Resistance, points 10 to 28
19

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0.18 to 0.28
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
24.3 to 37.1
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
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 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0