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ASTM A387 Grade 91 Class 2 vs. 204.0 Aluminum

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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