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ASTM A217 Cast Steel vs. AZ91A Magnesium

ASTM A217 cast steel belongs to the iron alloys classification, while AZ91A magnesium belongs to the magnesium alloys. There are 30 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 A217 cast steel and the bottom bar is AZ91A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 210
63
Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 21 to 27
5.0
Fatigue Strength, MPa 200 to 320
99
Poisson's Ratio 0.28 to 0.29
0.29
Shear Modulus, GPa 73 to 75
18
Tensile Strength: Ultimate (UTS), MPa 540 to 710
240
Tensile Strength: Yield (Proof), MPa 270 to 460
160

Thermal Properties

Latent Heat of Fusion, J/g 250 to 270
360
Maximum Temperature: Mechanical, °C 410 to 600
130
Melting Completion (Liquidus), °C 1450 to 1460
600
Melting Onset (Solidus), °C 1410 to 1420
470
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 26 to 50
73
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3 to 9.2
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4 to 11
52

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4 to 7.0
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 1.5 to 2.1
22
Embodied Energy, MJ/kg 20 to 28
160
Embodied Water, L/kg 47 to 87
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
11
Resilience: Unit (Modulus of Resilience), kJ/m3 190 to 570
280
Stiffness to Weight: Axial, points 13 to 14
15
Stiffness to Weight: Bending, points 24 to 25
69
Strength to Weight: Axial, points 19 to 25
38
Strength to Weight: Bending, points 19 to 23
49
Thermal Diffusivity, mm2/s 6.9 to 14
42
Thermal Shock Resistance, points 16 to 20
14