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7178 Aluminum vs. AISI 440B Stainless Steel

7178 aluminum belongs to the aluminum alloys classification, while AISI 440B stainless steel belongs to the iron alloys. There are 29 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 7178 aluminum and the bottom bar is AISI 440B stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.5 to 12
3.0 to 18
Fatigue Strength, MPa 120 to 210
260 to 850
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 140 to 380
460 to 1110
Tensile Strength: Ultimate (UTS), MPa 240 to 640
740 to 1930
Tensile Strength: Yield (Proof), MPa 120 to 560
430 to 1860

Thermal Properties

Latent Heat of Fusion, J/g 370
280
Maximum Temperature: Mechanical, °C 180
870
Melting Completion (Liquidus), °C 630
1480
Melting Onset (Solidus), °C 480
1370
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 130
23
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 31
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 91
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.0
Density, g/cm3 3.1
7.7
Embodied Carbon, kg CO2/kg material 8.2
2.2
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 1110
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
57 to 110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 21 to 58
27 to 70
Strength to Weight: Bending, points 28 to 54
24 to 45
Thermal Diffusivity, mm2/s 47
6.1
Thermal Shock Resistance, points 10 to 28
27 to 70

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0.75 to 1.0
Chromium (Cr), % 0.18 to 0.28
16 to 18
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
78.2 to 83.3
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.75
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0

Comparable Variants