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EN 1.4374 Stainless Steel vs. 4104 Aluminum

EN 1.4374 stainless steel belongs to the iron alloys classification, while 4104 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 EN 1.4374 stainless steel and the bottom bar is 4104 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 40
2.4
Fatigue Strength, MPa 340
42
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
27
Shear Strength, MPa 550
63
Tensile Strength: Ultimate (UTS), MPa 800
110
Tensile Strength: Yield (Proof), MPa 400
60

Thermal Properties

Latent Heat of Fusion, J/g 290
540
Maximum Temperature: Mechanical, °C 920
160
Melting Completion (Liquidus), °C 1400
600
Melting Onset (Solidus), °C 1360
560
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 15
130
Thermal Expansion, µm/m-K 17
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
120

Otherwise Unclassified Properties

Base Metal Price, % relative 14
9.5
Density, g/cm3 7.7
2.6
Embodied Carbon, kg CO2/kg material 2.9
8.0
Embodied Energy, MJ/kg 42
150
Embodied Water, L/kg 150
1080

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 400
25
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
54
Strength to Weight: Axial, points 29
12
Strength to Weight: Bending, points 25
20
Thermal Diffusivity, mm2/s 4.0
58
Thermal Shock Resistance, points 17
5.1

Alloy Composition

Aluminum (Al), % 0
85.8 to 90
Bismuth (Bi), % 0
0.020 to 0.2
Carbon (C), % 0.050 to 0.1
0
Chromium (Cr), % 17.5 to 18.5
0
Copper (Cu), % 0 to 0.4
0 to 0.25
Iron (Fe), % 63.5 to 67.9
0 to 0.8
Magnesium (Mg), % 0
1.0 to 2.0
Manganese (Mn), % 9.0 to 10
0 to 0.1
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 5.0 to 6.0
0
Nitrogen (N), % 0.25 to 0.32
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.3 to 0.6
9.0 to 10.5
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15