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ZK40A Magnesium vs. AISI 440A Stainless Steel

ZK40A magnesium belongs to the magnesium alloys classification, while AISI 440A stainless steel belongs to the iron alloys. There are 29 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 ZK40A magnesium and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 4.2
5.0 to 20
Fatigue Strength, MPa 190
270 to 790
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
77
Shear Strength, MPa 160
450 to 1040
Tensile Strength: Ultimate (UTS), MPa 280
730 to 1790
Tensile Strength: Yield (Proof), MPa 260
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Mechanical, °C 120
760
Melting Completion (Liquidus), °C 600
1480
Melting Onset (Solidus), °C 540
1370
Specific Heat Capacity, J/kg-K 970
480
Thermal Conductivity, W/m-K 110
23
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 13
9.0
Density, g/cm3 1.8
7.7
Embodied Carbon, kg CO2/kg material 24
2.2
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 950
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
87 to 120
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 65
25
Strength to Weight: Axial, points 43
26 to 65
Strength to Weight: Bending, points 53
23 to 43
Thermal Diffusivity, mm2/s 62
6.2
Thermal Shock Resistance, points 17
26 to 65

Alloy Composition

Carbon (C), % 0
0.6 to 0.75
Chromium (Cr), % 0
16 to 18
Iron (Fe), % 0
78.4 to 83.4
Magnesium (Mg), % 94.2 to 96.1
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.75
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 3.5 to 4.5
0
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0