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S32906 Stainless Steel vs. 4145 Aluminum

S32906 stainless steel belongs to the iron alloys classification, while 4145 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 S32906 stainless steel and the bottom bar is 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
73
Elongation at Break, % 28
2.2
Fatigue Strength, MPa 460
48
Poisson's Ratio 0.27
0.33
Shear Modulus, GPa 81
28
Shear Strength, MPa 550
69
Tensile Strength: Ultimate (UTS), MPa 850
120
Tensile Strength: Yield (Proof), MPa 620
68

Thermal Properties

Latent Heat of Fusion, J/g 300
540
Maximum Temperature: Mechanical, °C 1100
160
Melting Completion (Liquidus), °C 1430
590
Melting Onset (Solidus), °C 1380
520
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 13
100
Thermal Expansion, µm/m-K 13
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
26
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
84

Otherwise Unclassified Properties

Base Metal Price, % relative 20
10
Density, g/cm3 7.7
2.8
Embodied Carbon, kg CO2/kg material 3.7
7.6
Embodied Energy, MJ/kg 52
140
Embodied Water, L/kg 190
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 950
31
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 30
12
Strength to Weight: Bending, points 26
19
Thermal Diffusivity, mm2/s 3.6
42
Thermal Shock Resistance, points 23
5.5

Alloy Composition

Aluminum (Al), % 0
83 to 87.4
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 28 to 30
0 to 0.15
Copper (Cu), % 0 to 0.8
3.3 to 4.7
Iron (Fe), % 56.6 to 63.6
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0.8 to 1.5
0 to 0.15
Molybdenum (Mo), % 1.5 to 2.6
0
Nickel (Ni), % 5.8 to 7.5
0
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
9.3 to 10.7
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15