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ZK40A Magnesium vs. ASTM Grade HI Steel

ZK40A magnesium belongs to the magnesium alloys classification, while ASTM grade HI steel belongs to the iron alloys. There are 29 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 ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 4.2
11
Fatigue Strength, MPa 190
150
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 17
79
Tensile Strength: Ultimate (UTS), MPa 280
550
Tensile Strength: Yield (Proof), MPa 260
270

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Maximum Temperature: Mechanical, °C 120
1100
Melting Completion (Liquidus), °C 600
1400
Melting Onset (Solidus), °C 540
1350
Specific Heat Capacity, J/kg-K 970
490
Thermal Conductivity, W/m-K 110
15
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 13
23
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
4.1
Embodied Energy, MJ/kg 160
59
Embodied Water, L/kg 950
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
52
Resilience: Unit (Modulus of Resilience), kJ/m3 740
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 65
25
Strength to Weight: Axial, points 43
20
Strength to Weight: Bending, points 53
19
Thermal Diffusivity, mm2/s 62
3.9
Thermal Shock Resistance, points 17
12

Alloy Composition

Carbon (C), % 0
0.2 to 0.5
Chromium (Cr), % 0
26 to 30
Iron (Fe), % 0
46.9 to 59.8
Magnesium (Mg), % 94.2 to 96.1
0
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
14 to 18
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 3.5 to 4.5
0
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0