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AZ81A Magnesium vs. ASTM A225 Steel

AZ81A magnesium belongs to the magnesium alloys classification, while ASTM A225 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 AZ81A magnesium and the bottom bar is ASTM A225 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 55
190 to 250
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 3.0 to 8.8
21 to 23
Fatigue Strength, MPa 78 to 80
330 to 390
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 91 to 130
390 to 520
Tensile Strength: Ultimate (UTS), MPa 160 to 240
620 to 830
Tensile Strength: Yield (Proof), MPa 84
460 to 550

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
400
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 12
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 65
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.3
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 23
1.8
Embodied Energy, MJ/kg 160
24 to 25
Embodied Water, L/kg 990
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
120 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
580 to 820
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 70
24
Strength to Weight: Axial, points 26 to 39
22 to 29
Strength to Weight: Bending, points 38 to 50
21 to 25
Thermal Diffusivity, mm2/s 50
14
Thermal Shock Resistance, points 9.1 to 14
18 to 24

Comparable Variants