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SAE-AISI D7 Steel vs. ZK51A Magnesium

SAE-AISI D7 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 D7 steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
45
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 73
18
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
240

Thermal Properties

Latent Heat of Fusion, J/g 270
340
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1400
550
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 27
110
Thermal Expansion, µm/m-K 11
26

Otherwise Unclassified Properties

Base Metal Price, % relative 10
13
Density, g/cm3 7.6
1.8
Embodied Carbon, kg CO2/kg material 11
24
Embodied Energy, MJ/kg 180
160
Embodied Water, L/kg 130
940

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
64
Strength to Weight: Axial, points 29 to 78
36
Strength to Weight: Bending, points 25 to 48
47
Thermal Diffusivity, mm2/s 7.4
61
Thermal Shock Resistance, points 27 to 72
15

Alloy Composition

Carbon (C), % 2.2 to 2.5
0
Chromium (Cr), % 11.5 to 13.5
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 76.6 to 81.9
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0 to 0.6
0
Molybdenum (Mo), % 0.7 to 1.2
0
Nickel (Ni), % 0 to 0.3
0 to 0.010
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.6
0
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 3.8 to 4.4
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3