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EN 1.4971 Stainless Steel vs. 7022 Aluminum

EN 1.4971 stainless steel belongs to the iron alloys classification, while 7022 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 7022 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
70
Elongation at Break, % 34
6.3 to 8.0
Fatigue Strength, MPa 270
140 to 170
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 81
26
Shear Strength, MPa 530
290 to 320
Tensile Strength: Ultimate (UTS), MPa 800
490 to 540
Tensile Strength: Yield (Proof), MPa 340
390 to 460

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Maximum Temperature: Mechanical, °C 1100
200
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1410
480
Specific Heat Capacity, J/kg-K 450
870
Thermal Conductivity, W/m-K 13
140
Thermal Expansion, µm/m-K 15
24

Otherwise Unclassified Properties

Base Metal Price, % relative 70
10
Density, g/cm3 8.4
2.9
Embodied Carbon, kg CO2/kg material 7.6
8.5
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 300
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
29 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1100 to 1500
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 26
47 to 51
Strength to Weight: Bending, points 23
47 to 50
Thermal Diffusivity, mm2/s 3.4
54
Thermal Shock Resistance, points 19
21 to 23

Alloy Composition

Aluminum (Al), % 0
87.9 to 92.4
Carbon (C), % 0.080 to 0.16
0
Chromium (Cr), % 20 to 22.5
0.1 to 0.3
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 24.3 to 37.1
0 to 0.5
Magnesium (Mg), % 0
2.6 to 3.7
Manganese (Mn), % 0 to 2.0
0.1 to 0.4
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 0.5
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
4.3 to 5.2
Zirconium (Zr), % 0
0 to 0.2
Residuals, % 0
0 to 0.15