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EN 1.3956 Stainless Steel vs. 7049 Aluminum

EN 1.3956 stainless steel belongs to the iron alloys classification, while 7049 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, 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 1.3956 stainless steel and the bottom bar is 7049 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 27
6.2 to 7.0
Fatigue Strength, MPa 240
160 to 170
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 79
27
Tensile Strength: Ultimate (UTS), MPa 650
510 to 530
Tensile Strength: Yield (Proof), MPa 330
420 to 450

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Maximum Temperature: Mechanical, °C 1080
180
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1380
480
Specific Heat Capacity, J/kg-K 480
860
Thermal Expansion, µm/m-K 13
23

Otherwise Unclassified Properties

Base Metal Price, % relative 22
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 4.8
8.1
Embodied Energy, MJ/kg 68
140
Embodied Water, L/kg 180
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
31 to 34
Resilience: Unit (Modulus of Resilience), kJ/m3 270
1270 to 1440
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 23
46 to 47
Strength to Weight: Bending, points 21
46 to 47
Thermal Shock Resistance, points 18
22 to 23

Alloy Composition

Aluminum (Al), % 0
85.7 to 89.5
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0.1 to 0.22
Copper (Cu), % 0
1.2 to 1.9
Iron (Fe), % 51.9 to 62.1
0 to 0.35
Magnesium (Mg), % 0
2.0 to 2.9
Manganese (Mn), % 4.0 to 6.0
0 to 0.2
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
7.2 to 8.2
Residuals, % 0
0 to 0.15