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S21603 Stainless Steel vs. 5251 Aluminum

S21603 stainless steel belongs to the iron alloys classification, while 5251 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 5251 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
44 to 79
Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 45
2.0 to 19
Fatigue Strength, MPa 360
59 to 110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 79
26
Shear Strength, MPa 490
110 to 160
Tensile Strength: Ultimate (UTS), MPa 690
180 to 280
Tensile Strength: Yield (Proof), MPa 390
67 to 250

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 990
180
Melting Completion (Liquidus), °C 1420
650
Melting Onset (Solidus), °C 1380
610
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
8.5
Embodied Energy, MJ/kg 50
150
Embodied Water, L/kg 160
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
5.4 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 380
33 to 450
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 25
18 to 29
Strength to Weight: Bending, points 22
26 to 35
Thermal Shock Resistance, points 15
7.9 to 13

Alloy Composition

Aluminum (Al), % 0
95.5 to 98.2
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 22
0 to 0.15
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 57.6 to 67.8
0 to 0.5
Magnesium (Mg), % 0
1.7 to 2.4
Manganese (Mn), % 7.5 to 9.0
0.1 to 0.5
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 0.4
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15