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AISI 420 Stainless Steel vs. 7204 Aluminum

AISI 420 stainless steel belongs to the iron alloys classification, while 7204 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 420 stainless steel and the bottom bar is 7204 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 8.0 to 15
11 to 13
Fatigue Strength, MPa 220 to 670
110 to 130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 76
26
Shear Strength, MPa 420 to 1010
130 to 220
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
220 to 380
Tensile Strength: Yield (Proof), MPa 380 to 1310
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 280
380
Maximum Temperature: Mechanical, °C 620
210
Melting Completion (Liquidus), °C 1510
640
Melting Onset (Solidus), °C 1450
520
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 27
150
Thermal Expansion, µm/m-K 10
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
39
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
120

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
9.5
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 2.0
8.4
Embodied Energy, MJ/kg 28
150
Embodied Water, L/kg 100
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
25 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
110 to 710
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 25 to 62
21 to 36
Strength to Weight: Bending, points 22 to 41
28 to 40
Thermal Diffusivity, mm2/s 7.3
58
Thermal Shock Resistance, points 25 to 62
9.4 to 16

Alloy Composition

Aluminum (Al), % 0
90.5 to 94.8
Carbon (C), % 0.15 to 0.4
0
Chromium (Cr), % 12 to 14
0 to 0.3
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 82.3 to 87.9
0 to 0.35
Magnesium (Mg), % 0
1.0 to 2.0
Manganese (Mn), % 0 to 1.0
0.2 to 0.7
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 0.75
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.3
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Vanadium (V), % 0
0 to 0.1
Zinc (Zn), % 0
4.0 to 5.0
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15

Comparable Variants