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AISI 431 Stainless Steel vs. 515.0 Aluminum

AISI 431 stainless steel belongs to the iron alloys classification, while 515.0 aluminum belongs to the aluminum alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, 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 431 stainless steel and the bottom bar is 515.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 15 to 17
10
Fatigue Strength, MPa 430 to 610
130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Shear Strength, MPa 550 to 840
190
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
280

Thermal Properties

Latent Heat of Fusion, J/g 280
470
Maximum Temperature: Mechanical, °C 850
170
Melting Completion (Liquidus), °C 1510
620
Melting Onset (Solidus), °C 1450
620
Specific Heat Capacity, J/kg-K 480
900
Thermal Expansion, µm/m-K 12
23

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
9.5
Density, g/cm3 7.7
2.6
Embodied Carbon, kg CO2/kg material 2.2
8.4
Embodied Energy, MJ/kg 31
150
Embodied Water, L/kg 120
1120

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
52
Strength to Weight: Axial, points 32 to 50
30
Strength to Weight: Bending, points 27 to 36
36
Thermal Shock Resistance, points 28 to 43
13

Alloy Composition

Aluminum (Al), % 0
93.6 to 96.6
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 15 to 17
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 78.2 to 83.8
0 to 1.3
Magnesium (Mg), % 0
2.5 to 4.0
Manganese (Mn), % 0 to 1.0
0.4 to 0.6
Nickel (Ni), % 1.3 to 2.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.5 to 10
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15