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ACI-ASTM CH20 Steel vs. ZK51A Magnesium

ACI-ASTM CH20 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 CH20 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, % 38
4.7
Fatigue Strength, MPa 290
62
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
18
Tensile Strength: Ultimate (UTS), MPa 610
240
Tensile Strength: Yield (Proof), MPa 350
150

Thermal Properties

Latent Heat of Fusion, J/g 310
340
Maximum Temperature: Mechanical, °C 1100
120
Melting Completion (Liquidus), °C 1410
640
Melting Onset (Solidus), °C 1430
550
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 14
110
Thermal Expansion, µm/m-K 15
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 20
13
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 3.7
24
Embodied Energy, MJ/kg 53
160
Embodied Water, L/kg 180
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
10
Resilience: Unit (Modulus of Resilience), kJ/m3 300
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
64
Strength to Weight: Axial, points 22
36
Strength to Weight: Bending, points 21
47
Thermal Diffusivity, mm2/s 3.7
61
Thermal Shock Resistance, points 15
15

Alloy Composition

Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 22 to 26
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 54.7 to 66
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 12 to 15
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