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AISI 309HCb Stainless Steel vs. 7021 Aluminum

AISI 309HCb stainless steel belongs to the iron alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 309HCb stainless steel and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 46
9.4
Fatigue Strength, MPa 210
150
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 78
26
Shear Strength, MPa 410
270
Tensile Strength: Ultimate (UTS), MPa 590
460
Tensile Strength: Yield (Proof), MPa 230
390

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Maximum Temperature: Mechanical, °C 1090
200
Melting Completion (Liquidus), °C 1420
630
Melting Onset (Solidus), °C 1380
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 15
150
Thermal Expansion, µm/m-K 16
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
38
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
120

Otherwise Unclassified Properties

Base Metal Price, % relative 23
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 4.1
8.3
Embodied Energy, MJ/kg 59
150
Embodied Water, L/kg 170
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
41
Resilience: Unit (Modulus of Resilience), kJ/m3 130
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 21
44
Strength to Weight: Bending, points 20
45
Thermal Diffusivity, mm2/s 4.0
59
Thermal Shock Resistance, points 13
20

Alloy Composition

Aluminum (Al), % 0
90.7 to 93.7
Carbon (C), % 0.040 to 0.1
0
Chromium (Cr), % 22 to 24
0 to 0.050
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 56 to 66
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0 to 2.0
0 to 0.1
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 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15