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ISO-WD32250 Magnesium vs. ACI-ASTM CF8M Steel

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while ACI-ASTM CF8M steel belongs to the iron 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 ISO-WD32250 magnesium and the bottom bar is ACI-ASTM CF8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 4.5 to 8.6
50
Fatigue Strength, MPa 170 to 210
280
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
78
Tensile Strength: Ultimate (UTS), MPa 310 to 330
540
Tensile Strength: Yield (Proof), MPa 240 to 290
290

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Maximum Temperature: Mechanical, °C 120
1000
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 550
1400
Specific Heat Capacity, J/kg-K 980
480
Thermal Conductivity, W/m-K 130
16
Thermal Expansion, µm/m-K 26
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 13
19
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
3.8
Embodied Energy, MJ/kg 160
53
Embodied Water, L/kg 950
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 26
230
Resilience: Unit (Modulus of Resilience), kJ/m3 630 to 930
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 67
25
Strength to Weight: Axial, points 49 to 51
19
Strength to Weight: Bending, points 58 to 60
19
Thermal Diffusivity, mm2/s 72
4.3
Thermal Shock Resistance, points 19 to 20
12

Alloy Composition


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Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
18 to 21
Iron (Fe), % 0
60.3 to 71
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
9.0 to 12
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 2.5 to 4.0
0
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0 to 0.3
0