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ASTM A356 Grade 9 vs. ISO-WD21150 Magnesium

ASTM A356 grade 9 belongs to the iron alloys classification, while ISO-WD21150 magnesium belongs to the magnesium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 A356 grade 9 and the bottom bar is ISO-WD21150 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
45
Elongation at Break, % 17
5.7 to 11
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
17
Tensile Strength: Ultimate (UTS), MPa 670
240 to 290
Tensile Strength: Yield (Proof), MPa 460
120 to 200

Thermal Properties

Latent Heat of Fusion, J/g 260
350
Maximum Temperature: Mechanical, °C 440
110
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 41
100
Thermal Expansion, µm/m-K 13
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
19
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
100

Otherwise Unclassified Properties

Base Metal Price, % relative 3.6
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 2.4
23
Embodied Energy, MJ/kg 33
160
Embodied Water, L/kg 56
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
15 to 24
Resilience: Unit (Modulus of Resilience), kJ/m3 570
160 to 460
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
70
Strength to Weight: Axial, points 24
40 to 48
Strength to Weight: Bending, points 22
52 to 58
Thermal Diffusivity, mm2/s 11
60
Thermal Shock Resistance, points 19
15 to 17

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 1.0 to 1.5
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 95.2 to 97.2
0 to 0.0050
Magnesium (Mg), % 0
94 to 97
Manganese (Mn), % 0.5 to 0.9
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.2
0
Nickel (Ni), % 0
0 to 0.0050
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.2 to 0.6
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.2 to 0.35
0
Zinc (Zn), % 0
0.5 to 1.5
Residuals, % 0
0 to 0.3