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ACI-ASTM CF20 Steel vs. ZK51A Magnesium

ACI-ASTM CF20 steel belongs to the iron alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 CF20 steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 50
4.7
Fatigue Strength, MPa 240
62
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Tensile Strength: Ultimate (UTS), MPa 530
240
Tensile Strength: Yield (Proof), MPa 250
150

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Mechanical, °C 970
120
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1410
550
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 16
110
Thermal Expansion, µm/m-K 17
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
28
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
140

Otherwise Unclassified Properties

Base Metal Price, % relative 16
13
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 3.1
24
Embodied Energy, MJ/kg 44
160
Embodied Water, L/kg 150
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
10
Resilience: Unit (Modulus of Resilience), kJ/m3 160
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
64
Strength to Weight: Axial, points 19
36
Strength to Weight: Bending, points 19
47
Thermal Diffusivity, mm2/s 4.3
61
Thermal Shock Resistance, points 11
15

Alloy Composition

Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 18 to 21
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 64.2 to 74
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0 to 1.5
0
Nickel (Ni), % 8.0 to 11
0 to 0.010
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3