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Annealed SAE-AISI A7 vs. ISO-WD21150-O

Annealed SAE-AISI A7 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 (11, 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 A7 and the bottom bar is ISO-WD21150-O.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
45
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
17
Tensile Strength: Ultimate (UTS), MPa 800
240

Thermal Properties

Latent Heat of Fusion, J/g 260
350
Melting Completion (Liquidus), °C 1470
600
Melting Onset (Solidus), °C 1430
550
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 37
100
Thermal Expansion, µm/m-K 12
27

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 7.7
1.7
Embodied Carbon, kg CO2/kg material 13
23
Embodied Energy, MJ/kg 200
160
Embodied Water, L/kg 100
980

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
70
Strength to Weight: Axial, points 29
40
Strength to Weight: Bending, points 25
52
Thermal Diffusivity, mm2/s 10
60
Thermal Shock Resistance, points 27
15

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Carbon (C), % 2.0 to 2.9
0
Chromium (Cr), % 5.0 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.050
Iron (Fe), % 81.4 to 87.7
0 to 0.0050
Magnesium (Mg), % 0
94 to 97
Manganese (Mn), % 0 to 0.8
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0 to 0.0050
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0
Zinc (Zn), % 0
0.5 to 1.5
Residuals, % 0
0 to 0.3