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AM60B Magnesium vs. SAE-AISI P20 Steel

AM60B magnesium belongs to the magnesium alloys classification, while SAE-AISI P20 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (9, 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 AM60B magnesium and the bottom bar is SAE-AISI P20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
73
Tensile Strength: Ultimate (UTS), MPa 230
540 to 1050

Thermal Properties

Latent Heat of Fusion, J/g 350
260
Melting Completion (Liquidus), °C 620
1460
Melting Onset (Solidus), °C 540
1420
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 61
45
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 13
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 72
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.8
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 23
1.6
Embodied Energy, MJ/kg 160
21
Embodied Water, L/kg 990
52

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 71
24
Strength to Weight: Axial, points 38
19 to 37
Strength to Weight: Bending, points 50
19 to 29
Thermal Diffusivity, mm2/s 37
12
Thermal Shock Resistance, points 14
18 to 35

Alloy Composition

Aluminum (Al), % 5.5 to 6.5
0
Carbon (C), % 0
0.28 to 0.4
Chromium (Cr), % 0
0.4 to 2.0
Copper (Cu), % 0 to 0.010
0 to 0.25
Iron (Fe), % 0 to 0.0050
95.2 to 98.5
Magnesium (Mg), % 92.6 to 94.3
0
Manganese (Mn), % 0.24 to 0.6
0.35 to 0.71
Molybdenum (Mo), % 0
0.3 to 0.55
Nickel (Ni), % 0 to 0.0020
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.1
0.2 to 0.8
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.22
0