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EN 1.4971 Stainless Steel vs. 7178 Aluminum

EN 1.4971 stainless steel belongs to the iron alloys classification, while 7178 aluminum belongs to the aluminum 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 EN 1.4971 stainless steel and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Maximum Temperature: Mechanical, °C 1100
180
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1410
480
Specific Heat Capacity, J/kg-K 450
860
Thermal Conductivity, W/m-K 13
130
Thermal Expansion, µm/m-K 15
23

Otherwise Unclassified Properties

Base Metal Price, % relative 70
10
Density, g/cm3 8.4
3.1
Embodied Carbon, kg CO2/kg material 7.6
8.2
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 300
1110

Common Calculations

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

Alloy Composition

Aluminum (Al), % 0
85.4 to 89.5
Carbon (C), % 0.080 to 0.16
0
Chromium (Cr), % 20 to 22.5
0.18 to 0.28
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
1.6 to 2.4
Iron (Fe), % 24.3 to 37.1
0 to 0.5
Magnesium (Mg), % 0
2.4 to 3.1
Manganese (Mn), % 0 to 2.0
0 to 0.3
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
0 to 0.2
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
6.3 to 7.3
Residuals, % 0
0 to 0.15