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S21900 Stainless Steel vs. 512.0 Aluminum

S21900 stainless steel belongs to the iron alloys classification, while 512.0 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 S21900 stainless steel and the bottom bar is 512.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
50
Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 50
2.0
Fatigue Strength, MPa 380
58
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Tensile Strength: Ultimate (UTS), MPa 710
130
Tensile Strength: Yield (Proof), MPa 390
83

Thermal Properties

Latent Heat of Fusion, J/g 290
420
Maximum Temperature: Mechanical, °C 980
180
Melting Completion (Liquidus), °C 1400
630
Melting Onset (Solidus), °C 1350
590
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 14
150
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
38
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
130

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.5
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 3.0
8.8
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 380
50
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
51
Strength to Weight: Axial, points 26
14
Strength to Weight: Bending, points 23
22
Thermal Diffusivity, mm2/s 3.8
60
Thermal Shock Resistance, points 15
6.1

Alloy Composition

Aluminum (Al), % 0
90.6 to 95.1
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 19 to 21.5
0 to 0.25
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 59.4 to 67.4
0 to 0.6
Magnesium (Mg), % 0
3.5 to 4.5
Manganese (Mn), % 8.0 to 10
0 to 0.8
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
1.4 to 2.2
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 0.35
Residuals, % 0
0 to 0.15