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EN 1.4318 Stainless Steel vs. 4145 Aluminum

EN 1.4318 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 EN 1.4318 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, % 44
2.2
Fatigue Strength, MPa 340
48
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
28
Shear Strength, MPa 520
69
Tensile Strength: Ultimate (UTS), MPa 740
120
Tensile Strength: Yield (Proof), MPa 380
68

Thermal Properties

Latent Heat of Fusion, J/g 290
540
Maximum Temperature: Mechanical, °C 910
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 15
100
Thermal Expansion, µm/m-K 16
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
26
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
84

Otherwise Unclassified Properties

Base Metal Price, % relative 13
10
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 2.8
7.6
Embodied Energy, MJ/kg 39
140
Embodied Water, L/kg 130
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 360
31
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 27
12
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 4.0
42
Thermal Shock Resistance, points 17
5.5

Alloy Composition

Aluminum (Al), % 0
83 to 87.4
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 16.5 to 18.5
0 to 0.15
Copper (Cu), % 0
3.3 to 4.7
Iron (Fe), % 70.2 to 77.4
0 to 0.8
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0 to 2.0
0 to 0.15
Nickel (Ni), % 6.0 to 8.0
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
9.3 to 10.7
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15