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ZK40A Magnesium vs. S17700 Stainless Steel

ZK40A magnesium belongs to the magnesium alloys classification, while S17700 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 S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 4.2
1.0 to 23
Fatigue Strength, MPa 190
290 to 560
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
76
Shear Strength, MPa 160
740 to 940
Tensile Strength: Ultimate (UTS), MPa 280
1180 to 1650
Tensile Strength: Yield (Proof), MPa 260
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Mechanical, °C 120
890
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 540
1400
Specific Heat Capacity, J/kg-K 970
480
Thermal Conductivity, W/m-K 110
15
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 13
13
Density, g/cm3 1.8
7.7
Embodied Carbon, kg CO2/kg material 24
2.8
Embodied Energy, MJ/kg 160
40
Embodied Water, L/kg 950
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 740
460 to 3750
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 65
25
Strength to Weight: Axial, points 43
42 to 59
Strength to Weight: Bending, points 53
32 to 40
Thermal Diffusivity, mm2/s 62
4.1
Thermal Shock Resistance, points 17
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0
0 to 0.090
Chromium (Cr), % 0
16 to 18
Iron (Fe), % 0
70.5 to 76.8
Magnesium (Mg), % 94.2 to 96.1
0
Manganese (Mn), % 0
0 to 1.0
Nickel (Ni), % 0
6.5 to 7.8
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