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1070A Aluminum vs. S31655 Stainless Steel

1070A aluminum belongs to the aluminum alloys classification, while S31655 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 1070A aluminum and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 18 to 40
210
Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 2.3 to 33
39
Fatigue Strength, MPa 17 to 51
300
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Shear Strength, MPa 44 to 81
490
Tensile Strength: Ultimate (UTS), MPa 68 to 140
710
Tensile Strength: Yield (Proof), MPa 17 to 120
350

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 170
1010
Melting Completion (Liquidus), °C 640
1430
Melting Onset (Solidus), °C 640
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 230
15
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 200
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
17
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.3
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 1200
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.0 to 18
230
Resilience: Unit (Modulus of Resilience), kJ/m3 2.1 to 100
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 7.0 to 14
25
Strength to Weight: Bending, points 14 to 22
23
Thermal Diffusivity, mm2/s 94
4.0
Thermal Shock Resistance, points 3.1 to 6.3
16

Alloy Composition

Aluminum (Al), % 99.7 to 100
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
19.5 to 21.5
Copper (Cu), % 0 to 0.030
0 to 1.0
Iron (Fe), % 0 to 0.25
63.2 to 71.9
Magnesium (Mg), % 0 to 0.030
0
Manganese (Mn), % 0 to 0.030
0 to 2.0
Molybdenum (Mo), % 0
0.5 to 1.5
Nickel (Ni), % 0
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.030
0
Zinc (Zn), % 0 to 0.070
0