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AZ91D Magnesium vs. ASTM Grade HC Steel

AZ91D magnesium belongs to the magnesium alloys classification, while ASTM grade HC steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (7, 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 AZ91D magnesium and the bottom bar is ASTM grade HC steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 2.3 to 4.5
6.0
Fatigue Strength, MPa 74 to 85
96
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
80
Tensile Strength: Ultimate (UTS), MPa 160 to 220
430
Tensile Strength: Yield (Proof), MPa 80 to 130
200

Thermal Properties

Latent Heat of Fusion, J/g 350
310
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 490
1370
Specific Heat Capacity, J/kg-K 990
490
Thermal Conductivity, W/m-K 78
17
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 12
14
Density, g/cm3 1.7
7.6
Embodied Carbon, kg CO2/kg material 22
2.8
Embodied Energy, MJ/kg 160
40
Embodied Water, L/kg 990
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
21
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
95
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 69
26
Strength to Weight: Axial, points 26 to 34
16
Strength to Weight: Bending, points 38 to 46
16
Thermal Diffusivity, mm2/s 45
4.5
Thermal Shock Resistance, points 9.5 to 13
14

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.5
Chromium (Cr), % 0
26 to 30
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
61.9 to 74
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.0020
0 to 4.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.35 to 1.0
0