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4007 Aluminum vs. AISI 418 Stainless Steel

4007 aluminum belongs to the aluminum alloys classification, while AISI 418 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 4007 aluminum and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 32 to 44
330
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 5.1 to 23
17
Fatigue Strength, MPa 46 to 88
520
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 80 to 90
680
Tensile Strength: Ultimate (UTS), MPa 130 to 160
1100
Tensile Strength: Yield (Proof), MPa 50 to 120
850

Thermal Properties

Latent Heat of Fusion, J/g 410
270
Maximum Temperature: Mechanical, °C 170
770
Melting Completion (Liquidus), °C 650
1500
Melting Onset (Solidus), °C 590
1460
Specific Heat Capacity, J/kg-K 890
470
Thermal Conductivity, W/m-K 170
25
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 42
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 140
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.8
8.0
Embodied Carbon, kg CO2/kg material 8.1
2.9
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 1160
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.4 to 23
170
Resilience: Unit (Modulus of Resilience), kJ/m3 18 to 110
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 12 to 15
38
Strength to Weight: Bending, points 20 to 23
29
Thermal Diffusivity, mm2/s 67
6.7
Thermal Shock Resistance, points 5.5 to 6.7
40

Alloy Composition

Aluminum (Al), % 94.1 to 97.6
0
Carbon (C), % 0
0.15 to 0.2
Chromium (Cr), % 0.050 to 0.25
12 to 14
Cobalt (Co), % 0 to 0.050
0
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0.4 to 1.0
78.5 to 83.6
Magnesium (Mg), % 0 to 0.2
0
Manganese (Mn), % 0.8 to 1.5
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0.15 to 0.7
1.8 to 2.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 1.0 to 1.7
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
2.5 to 3.5
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.15
0