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AZ91E Magnesium vs. ASTM A203 Steel

AZ91E magnesium belongs to the magnesium alloys classification, while ASTM A203 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 AZ91E magnesium and the bottom bar is ASTM A203 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 75
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.5 to 6.2
22 to 26
Fatigue Strength, MPa 81 to 85
210 to 280
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 89 to 150
330 to 370
Tensile Strength: Ultimate (UTS), MPa 160 to 260
520 to 590
Tensile Strength: Yield (Proof), MPa 96 to 130
290 to 390

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
410
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 500
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 84
52
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10 to 12
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 52 to 60
8.5 to 8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.2 to 4.0
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
1.6 to 1.7
Embodied Energy, MJ/kg 160
21 to 23
Embodied Water, L/kg 990
50 to 52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4 to 12
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 100 to 190
230 to 410
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 25 to 42
18 to 21
Strength to Weight: Bending, points 37 to 53
18 to 20
Thermal Diffusivity, mm2/s 49
14
Thermal Shock Resistance, points 9.0 to 15
15 to 17