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S21603 Stainless Steel vs. 5456 Aluminum

S21603 stainless steel belongs to the iron alloys classification, while 5456 aluminum belongs to the aluminum alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 S21603 stainless steel and the bottom bar is 5456 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 45
11 to 18
Fatigue Strength, MPa 360
130 to 210
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 79
26
Shear Strength, MPa 490
190 to 210
Tensile Strength: Ultimate (UTS), MPa 690
320 to 340
Tensile Strength: Yield (Proof), MPa 390
150 to 250

Thermal Properties

Latent Heat of Fusion, J/g 290
390
Maximum Temperature: Corrosion, °C 420
65
Maximum Temperature: Mechanical, °C 990
190
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1380
570
Specific Heat Capacity, J/kg-K 480
900
Thermal Expansion, µm/m-K 17
24

Otherwise Unclassified Properties

Base Metal Price, % relative 17
9.5
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 3.6
9.0
Embodied Energy, MJ/kg 50
150
Embodied Water, L/kg 160
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
33 to 46
Resilience: Unit (Modulus of Resilience), kJ/m3 380
170 to 470
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 25
33 to 35
Strength to Weight: Bending, points 22
38 to 40
Thermal Shock Resistance, points 15
14 to 15

Alloy Composition

Aluminum (Al), % 0
92 to 94.8
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 22
0.050 to 0.2
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 57.6 to 67.8
0 to 0.4
Magnesium (Mg), % 0
4.7 to 5.5
Manganese (Mn), % 7.5 to 9.0
0.5 to 1.0
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 5.0 to 7.0
0
Nitrogen (N), % 0.25 to 0.5
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 0.2
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15