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ASTM A216 Cast Steel vs. AZ91E Magnesium

ASTM A216 cast steel belongs to the iron alloys classification, while AZ91E magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (7, 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 A216 cast steel and the bottom bar is AZ91E magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 25 to 27
2.5 to 6.2
Fatigue Strength, MPa 170 to 230
81 to 85
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
18
Tensile Strength: Ultimate (UTS), MPa 500 to 570
160 to 260
Tensile Strength: Yield (Proof), MPa 230 to 310
96 to 130

Thermal Properties

Latent Heat of Fusion, J/g 250
350
Maximum Temperature: Mechanical, °C 400
130
Melting Completion (Liquidus), °C 1450 to 1460
600
Melting Onset (Solidus), °C 1410
500
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 49 to 52
84
Thermal Expansion, µm/m-K 12
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1 to 7.2
10 to 12
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2 to 8.3
52 to 60

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 1.4
22
Embodied Energy, MJ/kg 18
160
Embodied Water, L/kg 45
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 120
3.4 to 12
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 250
100 to 190
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 18 to 20
25 to 42
Strength to Weight: Bending, points 18 to 20
37 to 53
Thermal Diffusivity, mm2/s 13 to 14
49
Thermal Shock Resistance, points 16 to 18
9.0 to 15