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S21904 Stainless Steel vs. 6070 Aluminum

S21904 stainless steel belongs to the iron alloys classification, while 6070 aluminum belongs to the aluminum alloys. There are 30 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 S21904 stainless steel and the bottom bar is 6070 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 17 to 51
5.6 to 8.6
Fatigue Strength, MPa 380 to 550
95 to 130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 510 to 620
220 to 240
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
370 to 380
Tensile Strength: Yield (Proof), MPa 390 to 910
350

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 980
160
Melting Completion (Liquidus), °C 1400
650
Melting Onset (Solidus), °C 1350
570
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 14
160
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
41
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
140

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.5
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 3.0
8.3
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
20 to 32
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
880 to 900
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 25 to 36
38
Strength to Weight: Bending, points 23 to 29
42 to 43
Thermal Diffusivity, mm2/s 3.8
65
Thermal Shock Resistance, points 15 to 21
16 to 17

Alloy Composition

Aluminum (Al), % 0
94.6 to 98
Carbon (C), % 0 to 0.040
0
Chromium (Cr), % 19 to 21.5
0 to 0.1
Copper (Cu), % 0
0.15 to 0.4
Iron (Fe), % 59.5 to 67.4
0 to 0.5
Magnesium (Mg), % 0
0.5 to 1.2
Manganese (Mn), % 8.0 to 10
0.4 to 1.0
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
1.0 to 1.7
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15