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Annealed SAE-AISI T8 vs. ISO-WD21150-O

Annealed SAE-AISI T8 belongs to the iron alloys classification, while ISO-WD21150-O belongs to the magnesium alloys. There are 21 material properties with values for both materials. Properties with values for just one material (12, 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 annealed SAE-AISI T8 and the bottom bar is ISO-WD21150-O.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
17
Tensile Strength: Ultimate (UTS), MPa 780
240

Thermal Properties

Latent Heat of Fusion, J/g 250
350
Melting Completion (Liquidus), °C 1730
600
Melting Onset (Solidus), °C 1670
550
Specific Heat Capacity, J/kg-K 420
990
Thermal Conductivity, W/m-K 18
100
Thermal Expansion, µm/m-K 12
27

Otherwise Unclassified Properties

Base Metal Price, % relative 45
12
Density, g/cm3 9.0
1.7
Embodied Carbon, kg CO2/kg material 10
23
Embodied Energy, MJ/kg 160
160
Embodied Water, L/kg 120
980

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 22
70
Strength to Weight: Axial, points 24
40
Strength to Weight: Bending, points 21
52
Thermal Diffusivity, mm2/s 4.8
60
Thermal Shock Resistance, points 24
15

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Carbon (C), % 0.75 to 0.85
0
Chromium (Cr), % 3.8 to 4.5
0
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.050
Iron (Fe), % 69.3 to 75.4
0 to 0.0050
Magnesium (Mg), % 0
94 to 97
Manganese (Mn), % 0.2 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
0 to 0.0050
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0
Zinc (Zn), % 0
0.5 to 1.5
Residuals, % 0
0 to 0.3