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ASTM A387 Grade 91 Class 2 vs. 1230A Aluminum

ASTM A387 grade 91 class 2 belongs to the iron alloys classification, while 1230A aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 1230A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 20
4.5 to 34
Fatigue Strength, MPa 330
35 to 74
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 75
26
Shear Strength, MPa 420
59 to 99
Tensile Strength: Ultimate (UTS), MPa 670
89 to 170
Tensile Strength: Yield (Proof), MPa 470
29 to 150

Thermal Properties

Latent Heat of Fusion, J/g 270
400
Maximum Temperature: Mechanical, °C 600
170
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
640
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 26
230
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
60
Electrical Conductivity: Equal Weight (Specific), % IACS 10
200

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
9.0
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 2.6
8.2
Embodied Energy, MJ/kg 37
150
Embodied Water, L/kg 88
1190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
6.4 to 23
Resilience: Unit (Modulus of Resilience), kJ/m3 580
5.9 to 150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 24
9.1 to 17
Strength to Weight: Bending, points 22
16 to 25
Thermal Diffusivity, mm2/s 6.9
93
Thermal Shock Resistance, points 19
4.0 to 7.6

Alloy Composition

Aluminum (Al), % 0 to 0.020
99.3 to 100
Carbon (C), % 0.080 to 0.12
0
Chromium (Cr), % 8.0 to 9.5
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 87.3 to 90.3
0 to 0.7
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 0.3 to 0.6
0 to 0.050
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
0
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 0.7
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zinc (Zn), % 0
0 to 0.050
Zirconium (Zr), % 0 to 0.010
0