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AISI 439 Stainless Steel vs. 705.0 Aluminum

AISI 439 stainless steel belongs to the iron alloys classification, while 705.0 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (7, 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 705.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
62 to 65
Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 23
8.4 to 10
Fatigue Strength, MPa 170
63 to 98
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 490
240 to 260
Tensile Strength: Yield (Proof), MPa 250
130

Thermal Properties

Latent Heat of Fusion, J/g 280
390
Maximum Temperature: Mechanical, °C 890
180
Melting Completion (Liquidus), °C 1510
640
Melting Onset (Solidus), °C 1430
610
Specific Heat Capacity, J/kg-K 480
890
Thermal Conductivity, W/m-K 25
140
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
34
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
2.8
Embodied Carbon, kg CO2/kg material 2.3
8.4
Embodied Energy, MJ/kg 34
150
Embodied Water, L/kg 120
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
18 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 160
120 to 130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
49
Strength to Weight: Axial, points 18
24 to 26
Strength to Weight: Bending, points 18
31 to 32
Thermal Diffusivity, mm2/s 6.7
55
Thermal Shock Resistance, points 16
11

Alloy Composition

Aluminum (Al), % 0 to 0.15
92.3 to 98.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17 to 19
0 to 0.4
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 77.1 to 82.8
0 to 0.8
Magnesium (Mg), % 0
1.4 to 1.8
Manganese (Mn), % 0 to 1.0
0 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
0 to 3.3
Residuals, % 0
0 to 0.15