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SAE-AISI P4 Steel vs. ZK61A Magnesium

SAE-AISI P4 steel belongs to the iron alloys classification, while ZK61A magnesium belongs to the magnesium 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 SAE-AISI P4 steel and the bottom bar is ZK61A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
46
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
18
Tensile Strength: Ultimate (UTS), MPa 390 to 1980
290 to 310

Thermal Properties

Latent Heat of Fusion, J/g 260
330
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
530
Specific Heat Capacity, J/kg-K 470
960
Thermal Conductivity, W/m-K 41
120
Thermal Expansion, µm/m-K 12
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
29
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
130

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
13
Density, g/cm3 7.8
1.9
Embodied Carbon, kg CO2/kg material 1.8
23
Embodied Energy, MJ/kg 23
160
Embodied Water, L/kg 68
940

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
62
Strength to Weight: Axial, points 14 to 70
42 to 45
Strength to Weight: Bending, points 15 to 45
50 to 53
Thermal Diffusivity, mm2/s 11
65
Thermal Shock Resistance, points 13 to 64
17 to 18

Alloy Composition

Carbon (C), % 0 to 0.12
0
Chromium (Cr), % 4.0 to 5.3
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 92.3 to 95.3
0
Magnesium (Mg), % 0
92.1 to 93.9
Manganese (Mn), % 0.2 to 0.6
0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0
0 to 0.010
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.1 to 0.4
0
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
5.5 to 6.5
Zirconium (Zr), % 0
0.6 to 1.0
Residuals, % 0
0 to 0.3