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AISI 309Cb Stainless Steel vs. 5056 Aluminum

AISI 309Cb stainless steel belongs to the iron alloys classification, while 5056 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 309Cb stainless steel and the bottom bar is 5056 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
67
Elongation at Break, % 39
4.9 to 31
Fatigue Strength, MPa 200
140 to 200
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
25
Shear Strength, MPa 390
170 to 240
Tensile Strength: Ultimate (UTS), MPa 580
290 to 460
Tensile Strength: Yield (Proof), MPa 230
150 to 410

Thermal Properties

Latent Heat of Fusion, J/g 300
400
Maximum Temperature: Mechanical, °C 1090
190
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1380
570
Specific Heat Capacity, J/kg-K 480
910
Thermal Conductivity, W/m-K 15
130
Thermal Expansion, µm/m-K 16
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
29
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
99

Otherwise Unclassified Properties

Base Metal Price, % relative 23
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 4.1
9.0
Embodied Energy, MJ/kg 59
150
Embodied Water, L/kg 170
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
12 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 140
170 to 1220
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
51
Strength to Weight: Axial, points 20
30 to 48
Strength to Weight: Bending, points 20
36 to 50
Thermal Diffusivity, mm2/s 4.0
53
Thermal Shock Resistance, points 13
13 to 20

Alloy Composition

Aluminum (Al), % 0
93 to 95.4
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 22 to 24
0.050 to 0.2
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 56 to 66
0 to 0.4
Magnesium (Mg), % 0
4.5 to 5.6
Manganese (Mn), % 0 to 2.0
0.050 to 0.2
Nickel (Ni), % 12 to 16
0
Niobium (Nb), % 0 to 1.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 0.3
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15