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EN 1.3956 Stainless Steel vs. 4045 Aluminum

EN 1.3956 stainless steel belongs to the iron alloys classification, while 4045 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, 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 1.3956 stainless steel and the bottom bar is 4045 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 27
2.3
Fatigue Strength, MPa 240
45
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 79
27
Tensile Strength: Ultimate (UTS), MPa 650
120
Tensile Strength: Yield (Proof), MPa 330
64

Thermal Properties

Latent Heat of Fusion, J/g 300
540
Maximum Temperature: Mechanical, °C 1080
160
Melting Completion (Liquidus), °C 1420
600
Melting Onset (Solidus), °C 1380
580
Specific Heat Capacity, J/kg-K 480
900
Thermal Expansion, µm/m-K 13
21

Otherwise Unclassified Properties

Base Metal Price, % relative 22
9.5
Density, g/cm3 7.8
2.6
Embodied Carbon, kg CO2/kg material 4.8
7.8
Embodied Energy, MJ/kg 68
150
Embodied Water, L/kg 180
1070

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
2.4
Resilience: Unit (Modulus of Resilience), kJ/m3 270
29
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
54
Strength to Weight: Axial, points 23
13
Strength to Weight: Bending, points 21
21
Thermal Shock Resistance, points 18
5.7

Alloy Composition

Aluminum (Al), % 0
87.4 to 91
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 51.9 to 62.1
0 to 0.8
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 4.0 to 6.0
0 to 0.050
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
9.0 to 11
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15