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ACI-ASTM CF8M Steel vs. AM50A Magnesium

ACI-ASTM CF8M steel belongs to the iron alloys classification, while AM50A magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 CF8M steel and the bottom bar is AM50A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
58
Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 50
11
Fatigue Strength, MPa 280
70
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
17
Tensile Strength: Ultimate (UTS), MPa 540
210
Tensile Strength: Yield (Proof), MPa 290
120

Thermal Properties

Latent Heat of Fusion, J/g 300
350
Maximum Temperature: Mechanical, °C 1000
120
Melting Completion (Liquidus), °C 1440
620
Melting Onset (Solidus), °C 1400
570
Specific Heat Capacity, J/kg-K 480
1000
Thermal Conductivity, W/m-K 16
65
Thermal Expansion, µm/m-K 16
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
16
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
88

Otherwise Unclassified Properties

Base Metal Price, % relative 19
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 3.8
23
Embodied Energy, MJ/kg 53
160
Embodied Water, L/kg 160
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
19
Resilience: Unit (Modulus of Resilience), kJ/m3 210
150
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
71
Strength to Weight: Axial, points 19
35
Strength to Weight: Bending, points 19
47
Thermal Diffusivity, mm2/s 4.3
39
Thermal Shock Resistance, points 12
13

Alloy Composition

Aluminum (Al), % 0
4.4 to 5.4
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 18 to 21
0
Copper (Cu), % 0
0 to 0.010
Iron (Fe), % 60.3 to 71
0 to 0.0040
Magnesium (Mg), % 0
93.7 to 95.3
Manganese (Mn), % 0 to 1.5
0.26 to 0.6
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 9.0 to 12
0 to 0.0020
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.1
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.22