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4104 Aluminum vs. S20910 Stainless Steel

4104 aluminum belongs to the aluminum alloys classification, while S20910 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, 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 4104 aluminum and the bottom bar is S20910 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 2.4
14 to 39
Fatigue Strength, MPa 42
310 to 460
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
79
Shear Strength, MPa 63
500 to 570
Tensile Strength: Ultimate (UTS), MPa 110
780 to 940
Tensile Strength: Yield (Proof), MPa 60
430 to 810

Thermal Properties

Latent Heat of Fusion, J/g 540
300
Maximum Temperature: Mechanical, °C 160
1080
Melting Completion (Liquidus), °C 600
1420
Melting Onset (Solidus), °C 560
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 130
13
Thermal Expansion, µm/m-K 22
16

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
22
Density, g/cm3 2.6
7.8
Embodied Carbon, kg CO2/kg material 8.0
4.8
Embodied Energy, MJ/kg 150
68
Embodied Water, L/kg 1080
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
120 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 25
460 to 1640
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 54
25
Strength to Weight: Axial, points 12
28 to 33
Strength to Weight: Bending, points 20
24 to 27
Thermal Diffusivity, mm2/s 58
3.6
Thermal Shock Resistance, points 5.1
17 to 21

Alloy Composition

Aluminum (Al), % 85.8 to 90
0
Bismuth (Bi), % 0.020 to 0.2
0
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0
20.5 to 23.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.8
52.1 to 62.1
Magnesium (Mg), % 1.0 to 2.0
0
Manganese (Mn), % 0 to 0.1
4.0 to 6.0
Molybdenum (Mo), % 0
1.5 to 3.0
Nickel (Ni), % 0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.0 to 10.5
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0