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6101B Aluminum vs. S35125 Stainless Steel

6101B aluminum belongs to the aluminum alloys classification, while S35125 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 6101B aluminum and the bottom bar is S35125 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 9.1 to 13
39
Fatigue Strength, MPa 62 to 70
200
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Shear Strength, MPa 120 to 150
370
Tensile Strength: Ultimate (UTS), MPa 190 to 250
540
Tensile Strength: Yield (Proof), MPa 140 to 180
230

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 640
1430
Melting Onset (Solidus), °C 630
1380
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 210
12
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 57
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 190
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
36
Density, g/cm3 2.7
8.1
Embodied Carbon, kg CO2/kg material 8.3
6.4
Embodied Energy, MJ/kg 150
89
Embodied Water, L/kg 1190
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20 to 23
170
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 240
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 20 to 25
19
Strength to Weight: Bending, points 27 to 32
18
Thermal Diffusivity, mm2/s 87
3.1
Thermal Shock Resistance, points 8.5 to 11
12

Alloy Composition

Aluminum (Al), % 98.2 to 99.3
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
20 to 23
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0.1 to 0.3
36.2 to 45.8
Magnesium (Mg), % 0.35 to 0.6
0
Manganese (Mn), % 0 to 0.050
1.0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
31 to 35
Niobium (Nb), % 0
0.25 to 0.6
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.3 to 0.6
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.1
0