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ZK40A Magnesium vs. ASTM A227 Spring Steel

ZK40A magnesium belongs to the magnesium alloys classification, while ASTM A227 spring steel belongs to the iron alloys. There are 29 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 ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 4.2
12
Fatigue Strength, MPa 190
900 to 1160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
72
Shear Strength, MPa 160
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 280
1720 to 2220
Tensile Strength: Yield (Proof), MPa 260
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Maximum Temperature: Mechanical, °C 120
400
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
52
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 13
1.8
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 24
1.4
Embodied Energy, MJ/kg 160
19
Embodied Water, L/kg 950
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
200 to 260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 65
24
Strength to Weight: Axial, points 43
61 to 79
Strength to Weight: Bending, points 53
41 to 48
Thermal Diffusivity, mm2/s 62
14
Thermal Shock Resistance, points 17
55 to 71

Alloy Composition


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Carbon (C), % 0
0.45 to 0.85
Iron (Fe), % 0
97.4 to 99.1
Magnesium (Mg), % 94.2 to 96.1
0
Manganese (Mn), % 0
0.3 to 1.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.050
Zinc (Zn), % 3.5 to 4.5
0
Zirconium (Zr), % 0.45 to 1.0
0
Residuals, % 0 to 0.3
0