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AISI 329 Stainless Steel vs. 5251 Aluminum

AISI 329 stainless steel belongs to the iron alloys classification, while 5251 aluminum belongs to the aluminum alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 AISI 329 stainless steel and the bottom bar is 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
44 to 79
Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 17
2.0 to 19
Fatigue Strength, MPa 330
59 to 110
Poisson's Ratio 0.27
0.33
Shear Modulus, GPa 80
26
Shear Strength, MPa 440
110 to 160
Tensile Strength: Ultimate (UTS), MPa 710
180 to 280
Tensile Strength: Yield (Proof), MPa 540
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 300
400
Maximum Temperature: Mechanical, °C 1100
180
Melting Completion (Liquidus), °C 1440
650
Melting Onset (Solidus), °C 1390
610
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 16
150
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
37
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
120

Otherwise Unclassified Properties

Base Metal Price, % relative 16
9.5
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 3.1
8.5
Embodied Energy, MJ/kg 44
150
Embodied Water, L/kg 170
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 730
33 to 450
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 25
18 to 29
Strength to Weight: Bending, points 23
26 to 35
Thermal Diffusivity, mm2/s 4.3
61
Thermal Shock Resistance, points 19
7.9 to 13

Alloy Composition

Aluminum (Al), % 0
95.5 to 98.2
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 23 to 28
0 to 0.15
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 63.1 to 74
0 to 0.5
Magnesium (Mg), % 0
1.7 to 2.4
Manganese (Mn), % 0 to 1.0
0.1 to 0.5
Molybdenum (Mo), % 1.0 to 2.0
0
Nickel (Ni), % 2.0 to 5.0
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.75
0 to 0.4
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15