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S35500 Stainless Steel vs. 4145 Aluminum

S35500 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 (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 S35500 stainless steel and the bottom bar is 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 14
2.2
Fatigue Strength, MPa 690 to 730
48
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
28
Shear Strength, MPa 810 to 910
69
Tensile Strength: Ultimate (UTS), MPa 1330 to 1490
120
Tensile Strength: Yield (Proof), MPa 1200 to 1280
68

Thermal Properties

Latent Heat of Fusion, J/g 280
540
Maximum Temperature: Mechanical, °C 870
160
Melting Completion (Liquidus), °C 1460
590
Melting Onset (Solidus), °C 1420
520
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 16
100
Thermal Expansion, µm/m-K 11
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 16
10
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 3.5
7.6
Embodied Energy, MJ/kg 47
140
Embodied Water, L/kg 130
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180 to 190
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 3610 to 4100
31
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 47 to 53
12
Strength to Weight: Bending, points 34 to 37
19
Thermal Diffusivity, mm2/s 4.4
42
Thermal Shock Resistance, points 44 to 49
5.5

Alloy Composition

Aluminum (Al), % 0
83 to 87.4
Carbon (C), % 0.1 to 0.15
0
Chromium (Cr), % 15 to 16
0 to 0.15
Copper (Cu), % 0
3.3 to 4.7
Iron (Fe), % 73.2 to 77.7
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0.5 to 1.3
0 to 0.15
Molybdenum (Mo), % 2.5 to 3.2
0
Nickel (Ni), % 4.0 to 5.0
0
Niobium (Nb), % 0.1 to 0.5
0
Nitrogen (N), % 0.070 to 0.13
0
Phosphorus (P), % 0 to 0.040
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