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3105 Aluminum vs. S15700 Stainless Steel

3105 aluminum belongs to the aluminum alloys classification, while S15700 stainless steel belongs to the iron alloys. There are 31 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 3105 aluminum and the bottom bar is S15700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 29 to 67
200 to 460
Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 1.1 to 20
1.1 to 29
Fatigue Strength, MPa 39 to 95
370 to 770
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 77 to 140
770 to 1070
Tensile Strength: Ultimate (UTS), MPa 120 to 240
1180 to 1890
Tensile Strength: Yield (Proof), MPa 46 to 220
500 to 1770

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 180
870
Melting Completion (Liquidus), °C 660
1440
Melting Onset (Solidus), °C 640
1400
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 170
16
Thermal Expansion, µm/m-K 24
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 140
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.4
Embodied Energy, MJ/kg 150
47
Embodied Water, L/kg 1180
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.6 to 19
17 to 270
Resilience: Unit (Modulus of Resilience), kJ/m3 15 to 340
640 to 4660
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12 to 24
42 to 67
Strength to Weight: Bending, points 20 to 31
32 to 43
Thermal Diffusivity, mm2/s 68
4.2
Thermal Shock Resistance, points 5.2 to 11
39 to 63

Alloy Composition

Aluminum (Al), % 96 to 99.5
0.75 to 1.5
Carbon (C), % 0
0 to 0.090
Chromium (Cr), % 0 to 0.2
14 to 16
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 0 to 0.7
69.6 to 76.8
Magnesium (Mg), % 0.2 to 0.8
0
Manganese (Mn), % 0.3 to 0.8
0 to 1.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
6.5 to 7.7
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.4
0
Residuals, % 0 to 0.15
0

Comparable Variants