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204.0 Aluminum vs. S40930 Stainless Steel

204.0 aluminum belongs to the aluminum alloys classification, while S40930 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 204.0 aluminum and the bottom bar is S40930 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 90 to 120
160
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 5.7 to 7.8
23
Fatigue Strength, MPa 63 to 77
130
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
75
Tensile Strength: Ultimate (UTS), MPa 230 to 340
430
Tensile Strength: Yield (Proof), MPa 180 to 220
190

Thermal Properties

Latent Heat of Fusion, J/g 390
270
Maximum Temperature: Mechanical, °C 170
710
Melting Completion (Liquidus), °C 650
1450
Melting Onset (Solidus), °C 580
1410
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 120
25
Thermal Expansion, µm/m-K 19
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 29 to 34
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 87 to 100
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 11
8.5
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.3
Embodied Energy, MJ/kg 150
32
Embodied Water, L/kg 1150
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12 to 23
80
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 350
94
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 21 to 31
16
Strength to Weight: Bending, points 28 to 36
16
Thermal Diffusivity, mm2/s 46
6.7
Thermal Shock Resistance, points 12 to 18
16

Alloy Composition

Aluminum (Al), % 93.4 to 95.5
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
10.5 to 11.7
Copper (Cu), % 4.2 to 5.0
0
Iron (Fe), % 0 to 0.35
84.7 to 89.4
Magnesium (Mg), % 0.15 to 0.35
0
Manganese (Mn), % 0 to 0.1
0 to 1.0
Nickel (Ni), % 0 to 0.050
0 to 0.5
Niobium (Nb), % 0
0.080 to 0.75
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0
0 to 0.020
Tin (Sn), % 0 to 0.050
0
Titanium (Ti), % 0.15 to 0.3
0.050 to 0.2
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.15
0