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7129 Aluminum vs. EN 1.4594 Stainless Steel

7129 Aluminum belongs to the aluminum alloys classification, while EN 1.4594 stainless steel belongs to the iron 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 7129 Aluminum and the bottom bar is EN 1.4594 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 9.0 to 9.1
11 to 17
Fatigue Strength, MPa 150 to 190
490 to 620
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
76
Shear Strength, MPa 250 to 260
620 to 700
Tensile Strength: Ultimate (UTS), MPa 430
1020 to 1170
Tensile Strength: Yield (Proof), MPa 380 to 390
810 to 1140

Thermal Properties

Latent Heat of Fusion, J/g 380
280
Maximum Temperature: Mechanical, °C 180
820
Melting Completion (Liquidus), °C 630
1450
Melting Onset (Solidus), °C 510
1410
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 24
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 8.3
3.2
Embodied Energy, MJ/kg 150
45
Embodied Water, L/kg 1150
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
110 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
1660 to 3320
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 41
36 to 41
Strength to Weight: Bending, points 43 to 44
29 to 31
Thermal Diffusivity, mm2/s 58
4.4
Thermal Shock Resistance, points 19
34 to 39

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0 to 0.1
13 to 15
Copper (Cu), % 0.5 to 0.9
1.2 to 2.0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
72.6 to 79.5
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0 to 1.0
Molybdenum (Mo), % 0
1.2 to 2.0
Nickel (Ni), % 0
5.0 to 6.0
Niobium (Nb), % 0
0.15 to 0.6
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.15
0 to 0.7
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0