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EN 1.4618 Stainless Steel vs. 6351 Aluminum

EN 1.4618 stainless steel belongs to the iron alloys classification, while 6351 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 EN 1.4618 stainless steel and the bottom bar is 6351 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 51
7.8 to 18
Fatigue Strength, MPa 240 to 250
79 to 130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Shear Strength, MPa 480 to 500
84 to 200
Tensile Strength: Ultimate (UTS), MPa 680 to 700
140 to 310
Tensile Strength: Yield (Proof), MPa 250 to 260
95 to 270

Thermal Properties

Latent Heat of Fusion, J/g 280
410
Maximum Temperature: Mechanical, °C 900
160
Melting Completion (Liquidus), °C 1400
650
Melting Onset (Solidus), °C 1360
570
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 15
180
Thermal Expansion, µm/m-K 16
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
46
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
150

Otherwise Unclassified Properties

Base Metal Price, % relative 13
9.5
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 2.7
8.3
Embodied Energy, MJ/kg 39
150
Embodied Water, L/kg 150
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 270 to 280
20 to 38
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 170
65 to 540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 24 to 25
14 to 32
Strength to Weight: Bending, points 22 to 23
22 to 38
Thermal Diffusivity, mm2/s 4.0
72
Thermal Shock Resistance, points 15 to 16
6.1 to 14

Alloy Composition

Aluminum (Al), % 0
96 to 98.5
Carbon (C), % 0 to 0.1
0
Chromium (Cr), % 16.5 to 18.5
0
Copper (Cu), % 1.0 to 2.5
0 to 0.1
Iron (Fe), % 62.7 to 72.5
0 to 0.5
Magnesium (Mg), % 0
0.4 to 0.8
Manganese (Mn), % 5.5 to 9.5
0.4 to 0.8
Nickel (Ni), % 4.5 to 5.5
0
Nitrogen (N), % 0 to 0.15
0
Phosphorus (P), % 0 to 0.070
0
Silicon (Si), % 0 to 1.0
0.7 to 1.3
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15