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EN 1.4959 Stainless Steel vs. 7049A Aluminum

EN 1.4959 stainless steel belongs to the iron alloys classification, while 7049A aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 1.4959 stainless steel and the bottom bar is 7049A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 40
5.0 to 5.7
Fatigue Strength, MPa 170
180
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
27
Shear Strength, MPa 430
340 to 350
Tensile Strength: Ultimate (UTS), MPa 630
580 to 590
Tensile Strength: Yield (Proof), MPa 190
500 to 530

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Maximum Temperature: Mechanical, °C 1090
200
Melting Completion (Liquidus), °C 1400
640
Melting Onset (Solidus), °C 1350
430
Specific Heat Capacity, J/kg-K 480
850
Thermal Conductivity, W/m-K 12
130
Thermal Expansion, µm/m-K 15
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
40
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
120

Otherwise Unclassified Properties

Base Metal Price, % relative 31
10
Density, g/cm3 8.0
3.1
Embodied Carbon, kg CO2/kg material 5.4
8.2
Embodied Energy, MJ/kg 76
150
Embodied Water, L/kg 200
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
28 to 32
Resilience: Unit (Modulus of Resilience), kJ/m3 96
1800 to 1990
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
44
Strength to Weight: Axial, points 22
52 to 53
Strength to Weight: Bending, points 20
50 to 51
Thermal Diffusivity, mm2/s 3.2
50
Thermal Shock Resistance, points 15
25

Alloy Composition

Aluminum (Al), % 0.25 to 0.65
84.6 to 89.5
Carbon (C), % 0.050 to 0.1
0
Chromium (Cr), % 19 to 22
0.050 to 0.25
Cobalt (Co), % 0 to 0.5
0
Copper (Cu), % 0 to 0.5
1.2 to 1.9
Iron (Fe), % 39.4 to 50.5
0 to 0.5
Magnesium (Mg), % 0
2.1 to 3.1
Manganese (Mn), % 0 to 1.5
0 to 0.5
Nickel (Ni), % 30 to 34
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0 to 0.7
0 to 0.4
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0.25 to 0.65
0 to 0.25
Zinc (Zn), % 0
7.2 to 8.4
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15