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ACI-ASTM CG12 Steel vs. ZK40A Magnesium

ACI-ASTM CG12 steel belongs to the iron alloys classification, while ZK40A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 CG12 steel and the bottom bar is ZK40A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 40
4.2
Fatigue Strength, MPa 190
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
17
Tensile Strength: Ultimate (UTS), MPa 550
280
Tensile Strength: Yield (Proof), MPa 220
260

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Mechanical, °C 1040
120
Melting Completion (Liquidus), °C 1410
600
Melting Onset (Solidus), °C 1370
540
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 15
110
Thermal Expansion, µm/m-K 16
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
27
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
130

Otherwise Unclassified Properties

Base Metal Price, % relative 18
13
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 3.3
24
Embodied Energy, MJ/kg 48
160
Embodied Water, L/kg 160
950

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
12
Resilience: Unit (Modulus of Resilience), kJ/m3 120
740
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
65
Strength to Weight: Axial, points 20
43
Strength to Weight: Bending, points 19
53
Thermal Diffusivity, mm2/s 4.0
62
Thermal Shock Resistance, points 12
17

Alloy Composition

Carbon (C), % 0 to 0.12
0
Chromium (Cr), % 20 to 23
0
Iron (Fe), % 60.3 to 70
0
Magnesium (Mg), % 0
94.2 to 96.1
Manganese (Mn), % 0 to 1.5
0
Nickel (Ni), % 10 to 13
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
3.5 to 4.5
Zirconium (Zr), % 0
0.45 to 1.0
Residuals, % 0
0 to 0.3