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ZK40A Magnesium vs. S44635 Stainless Steel

ZK40A magnesium belongs to the magnesium alloys classification, while S44635 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 S44635 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
210
Elongation at Break, % 4.2
23
Fatigue Strength, MPa 190
390
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 17
81
Shear Strength, MPa 160
450
Tensile Strength: Ultimate (UTS), MPa 280
710
Tensile Strength: Yield (Proof), MPa 260
580

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Maximum Temperature: Mechanical, °C 120
1100
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 540
1420
Specific Heat Capacity, J/kg-K 970
470
Thermal Conductivity, W/m-K 110
16
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 13
22
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
4.4
Embodied Energy, MJ/kg 160
62
Embodied Water, L/kg 950
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
150
Resilience: Unit (Modulus of Resilience), kJ/m3 740
810
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 65
25
Strength to Weight: Axial, points 43
25
Strength to Weight: Bending, points 53
23
Thermal Diffusivity, mm2/s 62
4.4
Thermal Shock Resistance, points 17
23

Alloy Composition


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Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0
24.5 to 26
Iron (Fe), % 0
61.5 to 68.5
Magnesium (Mg), % 94.2 to 96.1
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
3.5 to 4.5
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8
Zinc (Zn), % 3.5 to 4.5
0
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0