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AISI 303 Stainless Steel vs. 7075 Aluminum

AISI 303 stainless steel belongs to the iron alloys classification, while 7075 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 303 stainless steel and the bottom bar is 7075 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 40 to 51
1.8 to 12
Fatigue Strength, MPa 230 to 360
110 to 190
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
26
Shear Strength, MPa 430 to 470
150 to 340
Tensile Strength: Ultimate (UTS), MPa 600 to 690
240 to 590
Tensile Strength: Yield (Proof), MPa 230 to 420
120 to 510

Thermal Properties

Latent Heat of Fusion, J/g 290
380
Maximum Temperature: Mechanical, °C 930
200
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1400
480
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 16
130
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
98

Otherwise Unclassified Properties

Base Metal Price, % relative 15
10
Calomel Potential, mV -80
-750
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 3.0
8.3
Embodied Energy, MJ/kg 42
150
Embodied Water, L/kg 140
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
7.8 to 44
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 440
110 to 1870
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 21 to 25
22 to 54
Strength to Weight: Bending, points 20 to 22
28 to 52
Thermal Diffusivity, m2/s 4.4
50
Thermal Shock Resistance, points 13 to 15
10 to 25

Alloy Composition

Aluminum (Al), % 0
86.9 to 91.4
Carbon (C), % 0 to 0.15
0
Chromium (Cr), % 17 to 19
0.18 to 0.28
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 67.3 to 74.9
0 to 0.5
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0 to 2.0
0 to 0.3
Nickel (Ni), % 8.0 to 10
0
Phosphorus (P), % 0 to 0.2
0
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0.15 to 0.35
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
5.1 to 6.1
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15

Comparable Variants