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6351 Aluminum vs. EN 1.4901 Stainless Steel

6351 aluminum belongs to the aluminum alloys classification, while EN 1.4901 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 6351 aluminum and the bottom bar is EN 1.4901 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 7.8 to 18
19
Fatigue Strength, MPa 79 to 130
310
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
76
Shear Strength, MPa 84 to 200
460
Tensile Strength: Ultimate (UTS), MPa 140 to 310
740
Tensile Strength: Yield (Proof), MPa 95 to 270
490

Thermal Properties

Latent Heat of Fusion, J/g 410
260
Maximum Temperature: Mechanical, °C 160
650
Melting Completion (Liquidus), °C 650
1490
Melting Onset (Solidus), °C 570
1450
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 180
26
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 46
8.2
Electrical Conductivity: Equal Weight (Specific), % IACS 150
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
11
Density, g/cm3 2.7
7.9
Embodied Carbon, kg CO2/kg material 8.3
2.8
Embodied Energy, MJ/kg 150
40
Embodied Water, L/kg 1180
89

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20 to 38
120
Resilience: Unit (Modulus of Resilience), kJ/m3 65 to 540
620
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 14 to 32
26
Strength to Weight: Bending, points 22 to 38
23
Thermal Diffusivity, mm2/s 72
6.9
Thermal Shock Resistance, points 6.1 to 14
23

Alloy Composition

Aluminum (Al), % 96 to 98.5
0 to 0.020
Boron (B), % 0
0.0010 to 0.0060
Carbon (C), % 0
0.070 to 0.13
Chromium (Cr), % 0
8.5 to 9.5
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0 to 0.5
85.8 to 89.1
Magnesium (Mg), % 0.4 to 0.8
0
Manganese (Mn), % 0.4 to 0.8
0.3 to 0.6
Molybdenum (Mo), % 0
0.3 to 0.6
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.040 to 0.090
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0.7 to 1.3
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0 to 0.2
0 to 0.010
Tungsten (W), % 0
1.5 to 2.0
Vanadium (V), % 0
0.15 to 0.25
Zinc (Zn), % 0 to 0.2
0
Zirconium (Zr), % 0
0 to 0.010
Residuals, % 0 to 0.15
0