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204.0 Aluminum vs. ASTM A387 Grade 91 Class 2

204.0 aluminum belongs to the aluminum alloys classification, while ASTM A387 grade 91 class 2 belongs to the iron alloys. There are 30 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 204.0 aluminum and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 90 to 120
200
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 5.7 to 7.8
20
Fatigue Strength, MPa 63 to 77
330
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
75
Tensile Strength: Ultimate (UTS), MPa 230 to 340
670
Tensile Strength: Yield (Proof), MPa 180 to 220
470

Thermal Properties

Latent Heat of Fusion, J/g 390
270
Maximum Temperature: Mechanical, °C 170
600
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 580
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 120
26
Thermal Expansion, µm/m-K 19
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 29 to 34
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 87 to 100
10

Otherwise Unclassified Properties

Base Metal Price, % relative 11
7.0
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.6
Embodied Energy, MJ/kg 150
37
Embodied Water, L/kg 1150
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12 to 23
120
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 350
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 21 to 31
24
Strength to Weight: Bending, points 28 to 36
22
Thermal Diffusivity, mm2/s 46
6.9
Thermal Shock Resistance, points 12 to 18
19

Alloy Composition

Aluminum (Al), % 93.4 to 95.5
0 to 0.020
Carbon (C), % 0
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Copper (Cu), % 4.2 to 5.0
0
Iron (Fe), % 0 to 0.35
87.3 to 90.3
Magnesium (Mg), % 0.15 to 0.35
0
Manganese (Mn), % 0 to 0.1
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0 to 0.050
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.2
0.2 to 0.5
Sulfur (S), % 0
0 to 0.010
Tin (Sn), % 0 to 0.050
0
Titanium (Ti), % 0.15 to 0.3
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 0 to 0.1
0
Zirconium (Zr), % 0
0 to 0.010
Residuals, % 0 to 0.15
0