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ZK40A Magnesium vs. S42030 Stainless Steel

ZK40A magnesium belongs to the magnesium alloys classification, while S42030 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 S42030 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 4.2
16
Fatigue Strength, MPa 190
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
76
Shear Strength, MPa 160
410
Tensile Strength: Ultimate (UTS), MPa 280
670
Tensile Strength: Yield (Proof), MPa 260
410

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Mechanical, °C 120
780
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 540
1410
Specific Heat Capacity, J/kg-K 970
470
Thermal Conductivity, W/m-K 110
28
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 130
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 13
10
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
2.5
Embodied Energy, MJ/kg 160
34
Embodied Water, L/kg 950
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
92
Resilience: Unit (Modulus of Resilience), kJ/m3 740
440
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 65
25
Strength to Weight: Axial, points 43
24
Strength to Weight: Bending, points 53
22
Thermal Diffusivity, mm2/s 62
7.7
Thermal Shock Resistance, points 17
24

Alloy Composition


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Carbon (C), % 0
0 to 0.3
Chromium (Cr), % 0
12 to 14
Copper (Cu), % 0
2.0 to 3.0
Iron (Fe), % 0
77.6 to 85
Magnesium (Mg), % 94.2 to 96.1
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
1.0 to 3.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 3.5 to 4.5
0
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0