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AZ91C Magnesium vs. ASTM A302 Alloy Steel

AZ91C magnesium belongs to the magnesium alloys classification, while ASTM A302 alloy steel belongs to the iron alloys. There are 30 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 AZ91C magnesium and the bottom bar is ASTM A302 alloy steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.3 to 7.9
20 to 23
Fatigue Strength, MPa 56 to 85
250 to 280
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 96 to 160
370 to 390
Tensile Strength: Ultimate (UTS), MPa 170 to 270
590 to 620
Tensile Strength: Yield (Proof), MPa 83 to 130
350 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 470
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
39 to 51
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.9 to 12
7.2 to 7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 52 to 60
8.2 to 8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.4 to 3.0
Density, g/cm3 1.7
7.8 to 7.9
Embodied Carbon, kg CO2/kg material 22
1.5 to 1.6
Embodied Energy, MJ/kg 160
20 to 21
Embodied Water, L/kg 990
48 to 50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.2 to 16
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 180
330 to 410
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 27 to 43
21 to 22
Strength to Weight: Bending, points 39 to 53
20 to 21
Thermal Diffusivity, mm2/s 43
10 to 14
Thermal Shock Resistance, points 9.9 to 16
17 to 18