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S21900 Stainless Steel vs. 4007 Aluminum

S21900 stainless steel belongs to the iron alloys classification, while 4007 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 S21900 stainless steel and the bottom bar is 4007 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
32 to 44
Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 50
5.1 to 23
Fatigue Strength, MPa 380
46 to 88
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
27
Shear Strength, MPa 510
80 to 90
Tensile Strength: Ultimate (UTS), MPa 710
130 to 160
Tensile Strength: Yield (Proof), MPa 390
50 to 120

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 980
170
Melting Completion (Liquidus), °C 1400
650
Melting Onset (Solidus), °C 1350
590
Specific Heat Capacity, J/kg-K 480
890
Thermal Conductivity, W/m-K 14
170
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
42
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
140

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.5
Density, g/cm3 7.7
2.8
Embodied Carbon, kg CO2/kg material 3.0
8.1
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
7.4 to 23
Resilience: Unit (Modulus of Resilience), kJ/m3 380
18 to 110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
49
Strength to Weight: Axial, points 26
12 to 15
Strength to Weight: Bending, points 23
20 to 23
Thermal Diffusivity, mm2/s 3.8
67
Thermal Shock Resistance, points 15
5.5 to 6.7

Alloy Composition

Aluminum (Al), % 0
94.1 to 97.6
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 19 to 21.5
0.050 to 0.25
Cobalt (Co), % 0
0 to 0.050
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 59.4 to 67.4
0.4 to 1.0
Magnesium (Mg), % 0
0 to 0.2
Manganese (Mn), % 8.0 to 10
0.8 to 1.5
Nickel (Ni), % 5.5 to 7.5
0.15 to 0.7
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
1.0 to 1.7
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15