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SAE-AISI M44 Steel vs. ZK51A Magnesium

SAE-AISI M44 steel belongs to the iron alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 M44 steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
18
Tensile Strength: Ultimate (UTS), MPa 870 to 2290
240

Thermal Properties

Latent Heat of Fusion, J/g 270
340
Melting Completion (Liquidus), °C 1590
640
Melting Onset (Solidus), °C 1540
550
Specific Heat Capacity, J/kg-K 440
970
Thermal Conductivity, W/m-K 14
110
Thermal Expansion, µm/m-K 12
26

Otherwise Unclassified Properties

Base Metal Price, % relative 43
13
Density, g/cm3 8.4
1.8
Embodied Carbon, kg CO2/kg material 9.9
24
Embodied Energy, MJ/kg 150
160
Embodied Water, L/kg 170
940

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
64
Strength to Weight: Axial, points 28 to 75
36
Strength to Weight: Bending, points 24 to 46
47
Thermal Diffusivity, mm2/s 3.7
61
Thermal Shock Resistance, points 27 to 70
15

Alloy Composition

Carbon (C), % 1.1 to 1.2
0
Chromium (Cr), % 4.0 to 4.8
0
Cobalt (Co), % 11 to 12.3
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 65.3 to 70.6
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0.2 to 0.4
0
Molybdenum (Mo), % 6.0 to 7.0
0
Nickel (Ni), % 0 to 0.3
0 to 0.010
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.3 to 0.55
0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.0 to 5.8
0
Vanadium (V), % 1.9 to 2.2
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3