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ACI-ASTM CG6MMN Steel vs. AZ91D Magnesium

ACI-ASTM CG6MMN steel belongs to the iron alloys classification, while AZ91D magnesium belongs to the magnesium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (10, 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 ACI-ASTM CG6MMN steel and the bottom bar is AZ91D magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
60 to 80
Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 34
2.3 to 4.5
Fatigue Strength, MPa 260
74 to 85
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
18
Tensile Strength: Ultimate (UTS), MPa 670
160 to 220
Tensile Strength: Yield (Proof), MPa 320
80 to 130

Thermal Properties

Latent Heat of Fusion, J/g 300
350
Maximum Temperature: Mechanical, °C 1080
130
Melting Completion (Liquidus), °C 1420
600
Melting Onset (Solidus), °C 1380
490
Specific Heat Capacity, J/kg-K 480
990
Thermal Expansion, µm/m-K 17
27

Otherwise Unclassified Properties

Base Metal Price, % relative 22
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 4.8
22
Embodied Energy, MJ/kg 68
160
Embodied Water, L/kg 180
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
4.2 to 7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 260
69 to 170
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 24
26 to 34
Strength to Weight: Bending, points 22
38 to 46
Thermal Shock Resistance, points 14
9.5 to 13

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0
Copper (Cu), % 0
0 to 0.030
Iron (Fe), % 51.9 to 62.1
0 to 0.0050
Magnesium (Mg), % 0
88.7 to 91.2
Manganese (Mn), % 4.0 to 6.0
0.15 to 0.5
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
0 to 0.0020
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
0.35 to 1.0