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AZ91C Magnesium vs. ASTM A204 Steel

AZ91C magnesium belongs to the magnesium alloys classification, while ASTM A204 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 A204 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.3 to 7.9
18 to 22
Fatigue Strength, MPa 56 to 85
200 to 220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 96 to 160
330 to 360
Tensile Strength: Ultimate (UTS), MPa 170 to 270
520 to 590
Tensile Strength: Yield (Proof), MPa 83 to 130
290 to 330

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
410
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 470
1420 to 1430
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
52
Thermal Expansion, µm/m-K 26
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.4
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 990
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.2 to 16
90 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 180
220 to 290
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 27 to 43
18 to 21
Strength to Weight: Bending, points 39 to 53
18 to 20
Thermal Diffusivity, mm2/s 43
14
Thermal Shock Resistance, points 9.9 to 16
15 to 17