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AISI 439 Stainless Steel vs. 707.0 Aluminum

AISI 439 stainless steel belongs to the iron alloys classification, while 707.0 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (8, 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 AISI 439 stainless steel and the bottom bar is 707.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 23
1.7 to 3.4
Fatigue Strength, MPa 170
75 to 140
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 490
270 to 300
Tensile Strength: Yield (Proof), MPa 250
170 to 250

Thermal Properties

Latent Heat of Fusion, J/g 280
380
Maximum Temperature: Mechanical, °C 890
180
Melting Completion (Liquidus), °C 1510
630
Melting Onset (Solidus), °C 1430
600
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 25
150
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
37
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
110

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
9.5
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 2.3
8.3
Embodied Energy, MJ/kg 34
150
Embodied Water, L/kg 120
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
4.3 to 8.6
Resilience: Unit (Modulus of Resilience), kJ/m3 160
210 to 430
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 18
26 to 29
Strength to Weight: Bending, points 18
32 to 34
Thermal Diffusivity, mm2/s 6.7
58
Thermal Shock Resistance, points 16
12 to 13

Alloy Composition

Aluminum (Al), % 0 to 0.15
90.5 to 93.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17 to 19
0.2 to 0.4
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 77.1 to 82.8
0 to 0.8
Magnesium (Mg), % 0
1.8 to 2.4
Manganese (Mn), % 0 to 1.0
0.4 to 0.6
Nickel (Ni), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0.2 to 1.1
0 to 0.25
Zinc (Zn), % 0
4.0 to 4.5
Residuals, % 0
0 to 0.15